src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <net/if.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <syslog.h>
  11
  12 #include <uci.h>
  13 #include <uci_blob.h>
  14 #include <libubox/utils.h>
  15
  16 #include "odhcpd.h"
  17
  18 static struct blob_buf b;
  19 static int reload_pipe[2];
  20 struct list_head leases = LIST_HEAD_INIT(leases);
  21 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  22 struct config config = {.legacy = false, .main_dhcpv4 = false,
  23                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  24                         .log_level = LOG_INFO};
  25
  26 enum {
  27         IFACE_ATTR_INTERFACE,
  28         IFACE_ATTR_IFNAME,
  29         IFACE_ATTR_NETWORKID,
  30         IFACE_ATTR_DYNAMICDHCP,
  31         IFACE_ATTR_IGNORE,
  32         IFACE_ATTR_LEASETIME,
  33         IFACE_ATTR_LIMIT,
  34         IFACE_ATTR_START,
  35         IFACE_ATTR_MASTER,
  36         IFACE_ATTR_UPSTREAM,
  37         IFACE_ATTR_RA,
  38         IFACE_ATTR_DHCPV4,
  39         IFACE_ATTR_DHCPV6,
  40         IFACE_ATTR_NDP,
  41         IFACE_ATTR_ROUTER,
  42         IFACE_ATTR_DNS,
  43         IFACE_ATTR_DOMAIN,
  44         IFACE_ATTR_FILTER_CLASS,
  45         IFACE_ATTR_DHCPV4_FORCERECONF,
  46         IFACE_ATTR_DHCPV6_RAW,
  47         IFACE_ATTR_DHCPV6_ASSIGNALL,
  48         IFACE_ATTR_DHCPV6_PD,
  49         IFACE_ATTR_DHCPV6_NA,
  50         IFACE_ATTR_RA_DEFAULT,
  51         IFACE_ATTR_RA_MANAGEMENT,
  52         IFACE_ATTR_RA_OFFLINK,
  53         IFACE_ATTR_RA_PREFERENCE,
  54         IFACE_ATTR_RA_ADVROUTER,
  55         IFACE_ATTR_RA_MININTERVAL,
  56         IFACE_ATTR_RA_MAXINTERVAL,
  57         IFACE_ATTR_RA_LIFETIME,
  58         IFACE_ATTR_RA_USELEASETIME,
  59         IFACE_ATTR_RA_REACHABLETIME,
  60         IFACE_ATTR_RA_RETRANSTIME,
  61         IFACE_ATTR_RA_HOPLIMIT,
  62         IFACE_ATTR_RA_MTU,
  63         IFACE_ATTR_RA_DNS,
  64         IFACE_ATTR_PD_MANAGER,
  65         IFACE_ATTR_PD_CER,
  66         IFACE_ATTR_NDPROXY_ROUTING,
  67         IFACE_ATTR_NDPROXY_SLAVE,
  68         IFACE_ATTR_PREFIX_FILTER,
  69         IFACE_ATTR_MAX
  70 };
  71
  72 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  73         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  77         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  78         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  80         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  81         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  82         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  83         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  88         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  89         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  90         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  91         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
  92         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
  95         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
  96         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  99         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 101         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 102         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 103         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 104         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 105         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 106         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 107         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 108         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 109         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 110         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 111         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 112         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 113         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 114         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 115 };
 116
 117 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 118         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 119         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 120         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 121 };
 122
 123 const struct uci_blob_param_list interface_attr_list = {
 124         .n_params = IFACE_ATTR_MAX,
 125         .params = iface_attrs,
 126         .info = iface_attr_info,
 127 };
 128
 129 enum {
 130         LEASE_ATTR_IP,
 131         LEASE_ATTR_MAC,
 132         LEASE_ATTR_DUID,
 133         LEASE_ATTR_HOSTID,
 134         LEASE_ATTR_LEASETIME,
 135         LEASE_ATTR_NAME,
 136         LEASE_ATTR_MAX
 137 };
 138
 139 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 140         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 141         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 142         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 143         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 144         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 145         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 146 };
 147
 148 const struct uci_blob_param_list lease_attr_list = {
 149         .n_params = LEASE_ATTR_MAX,
 150         .params = lease_attrs,
 151 };
 152
 153 enum {
 154         ODHCPD_ATTR_LEGACY,
 155         ODHCPD_ATTR_MAINDHCP,
 156         ODHCPD_ATTR_LEASEFILE,
 157         ODHCPD_ATTR_LEASETRIGGER,
 158         ODHCPD_ATTR_LOGLEVEL,
 159         ODHCPD_ATTR_MAX
 160 };
 161
 162 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 163         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 164         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 165         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 166         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 167         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 168 };
 169
 170 const struct uci_blob_param_list odhcpd_attr_list = {
 171         .n_params = ODHCPD_ATTR_MAX,
 172         .params = odhcpd_attrs,
 173 };
 174
 175 static int mkdir_p(char *dir, mode_t mask)
 176 {
 177         char *l = strrchr(dir, '/');
 178         int ret;
 179
 180         if (!l)
 181                 return 0;
 182
 183         *l = '\0';
 184
 185         if (mkdir_p(dir, mask))
 186                 return -1;
 187
 188         *l = '/';
 189
 190         ret = mkdir(dir, mask);
 191         if (ret && errno == EEXIST)
 192                 return 0;
 193
 194         if (ret)
 195                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 196
 197         return ret;
 198 }
 199
 200 static void free_lease(struct lease *l)
 201 {
 202         if (l->head.next)
 203                 list_del(&l->head);
 204
 205         free(l->duid);
 206         free(l);
 207 }
 208
 209 static struct interface* get_interface(const char *name)
 210 {
 211         struct interface *c;
 212         list_for_each_entry(c, &interfaces, head)
 213                 if (!strcmp(c->name, name))
 214                         return c;
 215         return NULL;
 216 }
 217
 218 static void set_interface_defaults(struct interface *iface)
 219 {
 220         iface->learn_routes = 1;
 221         iface->dhcpv4_leasetime = 43200;
 222         iface->dhcpv6_assignall = true;
 223         iface->dhcpv6_pd = true;
 224         iface->dhcpv6_na = true;
 225         iface->ra_managed = RA_MANAGED_MFLAG;
 226         iface->ra_maxinterval = 600;
 227         iface->ra_mininterval = iface->ra_maxinterval/3;
 228         iface->ra_lifetime = -1;
 229         iface->ra_dns = true;
 230 }
 231
 232 static void clean_interface(struct interface *iface)
 233 {
 234         free(iface->dns);
 235         free(iface->search);
 236         free(iface->upstream);
 237         free(iface->dhcpv4_router);
 238         free(iface->dhcpv4_dns);
 239         free(iface->dhcpv6_raw);
 240         free(iface->filter_class);
 241         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 242         set_interface_defaults(iface);
 243 }
 244
 245 static void close_interface(struct interface *iface)
 246 {
 247         if (iface->head.next)
 248                 list_del(&iface->head);
 249
 250         router_setup_interface(iface, false);
 251         dhcpv6_setup_interface(iface, false);
 252         ndp_setup_interface(iface, false);
 253 #ifdef DHCPV4_SUPPORT
 254         dhcpv4_setup_interface(iface, false);
 255 #endif
 256
 257         clean_interface(iface);
 258         free(iface->addr4);
 259         free(iface->addr6);
 260         free(iface->ifname);
 261         free(iface);
 262 }
 263
 264 static int parse_mode(const char *mode)
 265 {
 266         if (!strcmp(mode, "disabled"))
 267                 return MODE_DISABLED;
 268         else if (!strcmp(mode, "server"))
 269                 return MODE_SERVER;
 270         else if (!strcmp(mode, "relay"))
 271                 return MODE_RELAY;
 272         else if (!strcmp(mode, "hybrid"))
 273                 return MODE_HYBRID;
 274         else
 275                 return -1;
 276 }
 277
 278 static void set_config(struct uci_section *s)
 279 {
 280         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 281
 282         blob_buf_init(&b, 0);
 283         uci_to_blob(&b, s, &odhcpd_attr_list);
 284         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 285
 286         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 287                 config.legacy = blobmsg_get_bool(c);
 288
 289         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 290                 config.main_dhcpv4 = blobmsg_get_bool(c);
 291
 292         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 293                 free(config.dhcp_statefile);
 294                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 295         }
 296
 297         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 298                 free(config.dhcp_cb);
 299                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 300         }
 301
 302         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 303                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 304
 305                 if (config.log_level != log_level) {
 306                         config.log_level = log_level;
 307                         setlogmask(LOG_UPTO(config.log_level));
 308                 }
 309         }
 310 }
 311
 312 static double parse_leasetime(struct blob_attr *c) {
 313         char *val = blobmsg_get_string(c), *endptr = NULL;
 314         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 315
 316         if (time && endptr && endptr[0]) {
 317                 if (endptr[0] == 's')
 318                         time *= 1;
 319                 else if (endptr[0] == 'm')
 320                         time *= 60;
 321                 else if (endptr[0] == 'h')
 322                         time *= 3600;
 323                 else if (endptr[0] == 'd')
 324                         time *= 24 * 3600;
 325                 else if (endptr[0] == 'w')
 326                         time *= 7 * 24 * 3600;
 327                 else
 328                         goto err;
 329         }
 330
 331         if (time < 60)
 332                 time = 60;
 333
 334         return time;
 335
 336 err:
 337         return -1;
 338 }
 339
 340 static int set_lease(struct uci_section *s)
 341 {
 342         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 343
 344         blob_buf_init(&b, 0);
 345         uci_to_blob(&b, s, &lease_attr_list);
 346         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 347
 348         size_t hostlen = 1;
 349         if ((c = tb[LEASE_ATTR_NAME]))
 350                 hostlen = blobmsg_data_len(c);
 351
 352         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 353         if (!lease)
 354                 goto err;
 355
 356         if (hostlen > 1) {
 357                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 358                 if (!odhcpd_valid_hostname(lease->hostname))
 359                         goto err;
 360         }
 361
 362         if ((c = tb[LEASE_ATTR_IP]))
 363                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 364                         goto err;
 365
 366         if ((c = tb[LEASE_ATTR_MAC]))
 367                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 368                         goto err;
 369
 370         if ((c = tb[LEASE_ATTR_DUID])) {
 371                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 372                 lease->duid = malloc(duidlen);
 373                 if (!lease->duid)
 374                         goto err;
 375
 376                 ssize_t len = odhcpd_unhexlify(lease->duid,
 377                                 duidlen, blobmsg_get_string(c));
 378
 379                 if (len < 0)
 380                         goto err;
 381
 382                 lease->duid_len = len;
 383         }
 384
 385         if ((c = tb[LEASE_ATTR_HOSTID])) {
 386                 errno = 0;
 387                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 388                 if (errno)
 389                         goto err;
 390         }
 391
 392         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 393                 double time = parse_leasetime(c);
 394                 if (time < 0)
 395                         goto err;
 396
 397                 lease->dhcpv4_leasetime = time;
 398         }
 399
 400         list_add(&lease->head, &leases);
 401         return 0;
 402
 403 err:
 404         if (lease)
 405                 free_lease(lease);
 406
 407         return -1;
 408 }
 409
 410 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 411 {
 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         struct interface *iface = get_interface(name);
 424         if (!iface) {
 425                 char *iface_name;
 426
 427                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 428                 if (!iface)
 429                         return -1;
 430
 431                 iface->name = strcpy(iface_name, name);
 432
 433                 set_interface_defaults(iface);
 434
 435                 list_add(&iface->head, &interfaces);
 436                 get_addrs = overwrite = true;
 437         }
 438
 439         const char *ifname = NULL;
 440         if (overwrite) {
 441                 if ((c = tb[IFACE_ATTR_IFNAME]))
 442                         ifname = blobmsg_get_string(c);
 443                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 444                         ifname = blobmsg_get_string(c);
 445         }
 446
 447 #ifdef WITH_UBUS
 448         if (overwrite || !iface->ifname)
 449                 ifname = ubus_get_ifname(name);
 450 #endif
 451
 452         if (!iface->ifname && !ifname)
 453                 goto err;
 454
 455         if (ifname) {
 456                 free(iface->ifname);
 457                 iface->ifname = strdup(ifname);
 458
 459                 if (!iface->ifname)
 460                         goto err;
 461
 462                 if (!iface->ifindex &&
 463                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 464                         goto err;
 465         }
 466
 467         if (get_addrs) {
 468                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 469                                                 true, &iface->addr6);
 470
 471                 if (len > 0)
 472                         iface->addr6_len = len;
 473
 474                 len = netlink_get_interface_addrs(iface->ifindex,
 475                                                 false, &iface->addr4);
 476                 if (len > 0)
 477                         iface->addr4_len = len;
 478         }
 479
 480         iface->inuse = true;
 481
 482         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 483                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 484
 485         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 486                 iface->ignore = blobmsg_get_bool(c);
 487
 488         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 489                 double time = parse_leasetime(c);
 490                 if (time < 0)
 491                         goto err;
 492
 493                 iface->dhcpv4_leasetime = time;
 494         }
 495
 496         if ((c = tb[IFACE_ATTR_START])) {
 497                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 498
 499                 if (config.main_dhcpv4 && config.legacy)
 500                         iface->dhcpv4 = MODE_SERVER;
 501         }
 502
 503         if ((c = tb[IFACE_ATTR_LIMIT]))
 504                 iface->dhcpv4_end.s_addr = htonl(
 505                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 506
 507         if ((c = tb[IFACE_ATTR_MASTER]))
 508                 iface->master = blobmsg_get_bool(c);
 509
 510         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 511                 struct blob_attr *cur;
 512                 unsigned rem;
 513
 514                 blobmsg_for_each_attr(cur, c, rem) {
 515                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 516                                 continue;
 517
 518                         iface->upstream = realloc(iface->upstream,
 519                                         iface->upstream_len + blobmsg_data_len(cur));
 520                         if (!iface->upstream)
 521                                 goto err;
 522
 523                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 524                         iface->upstream_len += blobmsg_data_len(cur);
 525                 }
 526         }
 527
 528         int mode;
 529         if ((c = tb[IFACE_ATTR_RA])) {
 530                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 531                         iface->ra = mode;
 532                 else
 533                         goto err;
 534         }
 535
 536         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 537                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 538                         if (config.main_dhcpv4)
 539                                 iface->dhcpv4 = mode;
 540                 }
 541                 else
 542                         goto err;
 543         }
 544
 545         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 546                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 547                         iface->dhcpv6 = mode;
 548                 else
 549                         goto err;
 550         }
 551
 552         if ((c = tb[IFACE_ATTR_NDP])) {
 553                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 554                         iface->ndp = mode;
 555                 else
 556                         goto err;
 557         }
 558
 559         if ((c = tb[IFACE_ATTR_ROUTER])) {
 560                 struct blob_attr *cur;
 561                 unsigned rem;
 562
 563                 blobmsg_for_each_attr(cur, c, rem) {
 564                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 565                                 continue;
 566
 567                         struct in_addr addr4;
 568                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 569                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 570                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 571                                 if (!iface->dhcpv4_router)
 572                                         goto err;
 573
 574                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 575                         } else
 576                                 goto err;
 577                 }
 578         }
 579
 580         if ((c = tb[IFACE_ATTR_DNS])) {
 581                 struct blob_attr *cur;
 582                 unsigned rem;
 583
 584                 iface->always_rewrite_dns = true;
 585                 blobmsg_for_each_attr(cur, c, rem) {
 586                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 587                                 continue;
 588
 589                         struct in_addr addr4;
 590                         struct in6_addr addr6;
 591                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 592                                 if (addr4.s_addr == INADDR_ANY)
 593                                         goto err;
 594
 595                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 596                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 597                                 if (!iface->dhcpv4_dns)
 598                                         goto err;
 599
 600                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 601                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 602                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 603                                         goto err;
 604
 605                                 iface->dns = realloc(iface->dns,
 606                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 607                                 if (!iface->dns)
 608                                         goto err;
 609
 610                                 iface->dns[iface->dns_cnt - 1] = addr6;
 611                         } else
 612                                 goto err;
 613                 }
 614         }
 615
 616         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 617                 struct blob_attr *cur;
 618                 unsigned rem;
 619
 620                 blobmsg_for_each_attr(cur, c, rem) {
 621                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 622                                 continue;
 623
 624                         uint8_t buf[256];
 625                         char *domain = blobmsg_get_string(cur);
 626                         size_t domainlen = strlen(domain);
 627                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 628                                 domain[domainlen - 1] = 0;
 629
 630                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 631                         if (len <= 0)
 632                                 goto err;
 633
 634                         iface->search = realloc(iface->search, iface->search_len + len);
 635                         if (!iface->search)
 636                                 goto err;
 637
 638                         memcpy(&iface->search[iface->search_len], buf, len);
 639                         iface->search_len += len;
 640                 }
 641         }
 642
 643         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 644                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 645                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 646         }
 647
 648         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 649                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 650
 651         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 652                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 653                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 654                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 655         }
 656
 657         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 658                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 659
 660         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 661                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 662
 663         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 664                 iface->dhcpv6_na = blobmsg_get_bool(c);
 665
 666         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 667                 iface->default_router = blobmsg_get_u32(c);
 668
 669         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 670                 iface->ra_managed = blobmsg_get_u32(c);
 671
 672         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 673                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 674                 if (ra_reachabletime > 3600000)
 675                         goto err;
 676
 677                 iface->ra_reachabletime = ra_reachabletime;
 678         }
 679
 680         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 681                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 682                 if (ra_retranstime > 60000)
 683                         goto err;
 684
 685                 iface->ra_retranstime = ra_retranstime;
 686         }
 687
 688         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 689                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 690                 if (ra_hoplimit > 255)
 691                         goto err;
 692
 693                 iface->ra_hoplimit = ra_hoplimit;
 694         }
 695
 696         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 697                 uint32_t ra_mtu = blobmsg_get_u32(c);
 698                 if (ra_mtu < 1280 || ra_mtu > 65535)
 699                         goto err;
 700
 701                 iface->ra_mtu = ra_mtu;
 702         }
 703
 704         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 705                 iface->ra_not_onlink = blobmsg_get_bool(c);
 706
 707         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 708                 iface->ra_advrouter = blobmsg_get_bool(c);
 709
 710         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 711                 iface->ra_mininterval =  blobmsg_get_u32(c);
 712
 713         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 714                 iface->ra_maxinterval = blobmsg_get_u32(c);
 715
 716         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 717                 iface->ra_lifetime = blobmsg_get_u32(c);
 718
 719         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 720                 iface->ra_useleasetime = blobmsg_get_bool(c);
 721
 722         if ((c = tb[IFACE_ATTR_RA_DNS]))
 723                 iface->ra_dns = blobmsg_get_bool(c);
 724
 725         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 726                 const char *prio = blobmsg_get_string(c);
 727
 728                 if (!strcmp(prio, "high"))
 729                         iface->route_preference = 1;
 730                 else if (!strcmp(prio, "low"))
 731                         iface->route_preference = -1;
 732                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 733                         iface->route_preference = 0;
 734                 else
 735                         goto err;
 736         }
 737
 738         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 739                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 740                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 741
 742         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 743                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 744                 goto err;
 745
 746         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 747                 iface->learn_routes = blobmsg_get_bool(c);
 748
 749         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 750                 iface->external = blobmsg_get_bool(c);
 751
 752         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 753                 const char *str = blobmsg_get_string(c);
 754                 char *astr = malloc(strlen(str) + 1);
 755                 char *delim;
 756                 int l;
 757
 758                 if (!astr || !strcpy(astr, str) ||
 759                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 760                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 761                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 762                         iface->pio_filter_length = 0;
 763                 else
 764                         iface->pio_filter_length = l;
 765
 766                 if (astr)
 767                         free(astr);
 768         }
 769
 770         return 0;
 771
 772 err:
 773         close_interface(iface);
 774         return -1;
 775 }
 776
 777 static int set_interface(struct uci_section *s)
 778 {
 779         blob_buf_init(&b, 0);
 780         uci_to_blob(&b, s, &interface_attr_list);
 781
 782         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 783 }
 784
 785 void odhcpd_reload(void)
 786 {
 787         struct uci_context *uci = uci_alloc_context();
 788
 789         while (!list_empty(&leases))
 790                 free_lease(list_first_entry(&leases, struct lease, head));
 791
 792         struct interface *master = NULL, *i, *n;
 793
 794         if (!uci)
 795                 return;
 796
 797         list_for_each_entry(i, &interfaces, head)
 798                 clean_interface(i);
 799
 800         struct uci_package *dhcp = NULL;
 801         if (!uci_load(uci, "dhcp", &dhcp)) {
 802                 struct uci_element *e;
 803                 uci_foreach_element(&dhcp->sections, e) {
 804                         struct uci_section *s = uci_to_section(e);
 805                         if (!strcmp(s->type, "host"))
 806                                 set_lease(s);
 807                         else if (!strcmp(s->type, "odhcpd"))
 808                                 set_config(s);
 809                 }
 810
 811                 uci_foreach_element(&dhcp->sections, e) {
 812                         struct uci_section *s = uci_to_section(e);
 813                         if (!strcmp(s->type, "dhcp"))
 814                                 set_interface(s);
 815                 }
 816         }
 817
 818         if (config.dhcp_statefile) {
 819                 char *path = strdup(config.dhcp_statefile);
 820
 821                 mkdir_p(dirname(path), 0755);
 822                 free(path);
 823         }
 824
 825 #ifdef WITH_UBUS
 826         ubus_apply_network();
 827 #endif
 828
 829         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 830
 831         /* Test for */
 832         list_for_each_entry(i, &interfaces, head) {
 833                 if (i->master)
 834                         continue;
 835
 836                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 837                         any_dhcpv6_slave = true;
 838
 839                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 840                         any_ra_slave = true;
 841
 842                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 843                         any_ndp_slave = true;
 844         }
 845
 846         /* Evaluate hybrid mode for master */
 847         list_for_each_entry(i, &interfaces, head) {
 848                 if (!i->master)
 849                         continue;
 850
 851                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 852 #ifdef WITH_UBUS
 853                 if (!ubus_has_prefix(i->name, i->ifname))
 854                         hybrid_mode = MODE_RELAY;
 855 #endif
 856
 857                 if (i->dhcpv6 == MODE_HYBRID)
 858                         i->dhcpv6 = hybrid_mode;
 859
 860                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 861                         i->dhcpv6 = MODE_DISABLED;
 862
 863                 if (i->ra == MODE_HYBRID)
 864                         i->ra = hybrid_mode;
 865
 866                 if (i->ra == MODE_RELAY && !any_ra_slave)
 867                         i->ra = MODE_DISABLED;
 868
 869                 if (i->ndp == MODE_HYBRID)
 870                         i->ndp = hybrid_mode;
 871
 872                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 873                         i->ndp = MODE_DISABLED;
 874
 875                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 876                         master = i;
 877         }
 878
 879
 880         list_for_each_entry_safe(i, n, &interfaces, head) {
 881                 if (i->inuse) {
 882                         /* Resolve hybrid mode */
 883                         if (i->dhcpv6 == MODE_HYBRID)
 884                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 885                                                 MODE_RELAY : MODE_SERVER;
 886
 887                         if (i->ra == MODE_HYBRID)
 888                                 i->ra = (master && master->ra == MODE_RELAY) ?
 889                                                 MODE_RELAY : MODE_SERVER;
 890
 891                         if (i->ndp == MODE_HYBRID)
 892                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 893                                                 MODE_RELAY : MODE_DISABLED;
 894
 895                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 896                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 897                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 898 #ifdef DHCPV4_SUPPORT
 899                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 900 #endif
 901                 } else
 902                         close_interface(i);
 903         }
 904
 905         uci_unload(uci, dhcp);
 906         uci_free_context(uci);
 907 }
 908
 909 static void handle_signal(int signal)
 910 {
 911         char b[1] = {0};
 912
 913         if (signal == SIGHUP) {
 914                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 915         } else
 916                 uloop_end();
 917 }
 918
 919 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 920 {
 921         char b[512];
 922         if (read(u->fd, b, sizeof(b)) < 0) {}
 923
 924         odhcpd_reload();
 925 }
 926
 927 static struct uloop_fd reload_fd = { .cb = reload_cb };
 928
 929 void odhcpd_run(void)
 930 {
 931         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 932
 933         reload_fd.fd = reload_pipe[0];
 934         uloop_fd_add(&reload_fd, ULOOP_READ);
 935
 936         signal(SIGTERM, handle_signal);
 937         signal(SIGINT, handle_signal);
 938         signal(SIGHUP, handle_signal);
 939
 940 #ifdef WITH_UBUS
 941         while (ubus_init())
 942                 sleep(1);
 943 #endif
 944
 945         odhcpd_reload();
 946         uloop_run();
 947
 948         while (!list_empty(&interfaces))
 949                 close_interface(list_first_entry(&interfaces, struct interface, head));
 950 }
 951