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 <string.h>
   8 #include <sys/stat.h>
   9 #include <syslog.h>
  10
  11 #include <uci.h>
  12 #include <uci_blob.h>
  13
  14 #include "odhcpd.h"
  15
  16 static struct blob_buf b;
  17 static int reload_pipe[2];
  18 struct list_head leases = LIST_HEAD_INIT(leases);
  19 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  20 struct config config = {.legacy = false, .dhcp_cb = NULL,
  21                         .dhcp_statefile = NULL, .log_level = LOG_INFO};
  22
  23 enum {
  24         IFACE_ATTR_INTERFACE,
  25         IFACE_ATTR_IFNAME,
  26         IFACE_ATTR_NETWORKID,
  27         IFACE_ATTR_DYNAMICDHCP,
  28         IFACE_ATTR_IGNORE,
  29         IFACE_ATTR_LEASETIME,
  30         IFACE_ATTR_LIMIT,
  31         IFACE_ATTR_START,
  32         IFACE_ATTR_MASTER,
  33         IFACE_ATTR_UPSTREAM,
  34         IFACE_ATTR_RA,
  35         IFACE_ATTR_DHCPV4,
  36         IFACE_ATTR_DHCPV6,
  37         IFACE_ATTR_NDP,
  38         IFACE_ATTR_ROUTER,
  39         IFACE_ATTR_DNS,
  40         IFACE_ATTR_DOMAIN,
  41         IFACE_ATTR_FILTER_CLASS,
  42         IFACE_ATTR_DHCPV6_RAW,
  43         IFACE_ATTR_RA_DEFAULT,
  44         IFACE_ATTR_RA_MANAGEMENT,
  45         IFACE_ATTR_RA_OFFLINK,
  46         IFACE_ATTR_RA_PREFERENCE,
  47         IFACE_ATTR_RA_ADVROUTER,
  48         IFACE_ATTR_RA_MININTERVAL,
  49         IFACE_ATTR_RA_MAXINTERVAL,
  50         IFACE_ATTR_RA_LIFETIME,
  51         IFACE_ATTR_PD_MANAGER,
  52         IFACE_ATTR_PD_CER,
  53         IFACE_ATTR_NDPROXY_ROUTING,
  54         IFACE_ATTR_NDPROXY_SLAVE,
  55         IFACE_ATTR_MAX
  56 };
  57
  58 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  59         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  63         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  64         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  66         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  67         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  68         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  69         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  74         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  75         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  76         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  81         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  82         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  83         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  85         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  86         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  87         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  88         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  90 };
  91
  92 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  93         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  96 };
  97
  98 const struct uci_blob_param_list interface_attr_list = {
  99         .n_params = IFACE_ATTR_MAX,
 100         .params = iface_attrs,
 101         .info = iface_attr_info,
 102 };
 103
 104 enum {
 105         LEASE_ATTR_IP,
 106         LEASE_ATTR_MAC,
 107         LEASE_ATTR_DUID,
 108         LEASE_ATTR_HOSTID,
 109         LEASE_ATTR_LEASETIME,
 110         LEASE_ATTR_NAME,
 111         LEASE_ATTR_MAX
 112 };
 113
 114 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 115         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 116         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 117         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 118         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 119         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 120         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 121 };
 122
 123 const struct uci_blob_param_list lease_attr_list = {
 124         .n_params = LEASE_ATTR_MAX,
 125         .params = lease_attrs,
 126 };
 127
 128 enum {
 129         ODHCPD_ATTR_MAINDHCP,
 130         ODHCPD_ATTR_LEASEFILE,
 131         ODHCPD_ATTR_LEASETRIGGER,
 132         ODHCPD_ATTR_LOGLEVEL,
 133         ODHCPD_ATTR_MAX
 134 };
 135
 136 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 137         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 138         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 139         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 140         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 141 };
 142
 143 const struct uci_blob_param_list odhcpd_attr_list = {
 144         .n_params = ODHCPD_ATTR_MAX,
 145         .params = odhcpd_attrs,
 146 };
 147
 148 static int mkdir_p(char *dir, mode_t mask)
 149 {
 150         char *l = strrchr(dir, '/');
 151         int ret;
 152
 153         if (!l)
 154                 return 0;
 155
 156         *l = '\0';
 157
 158         if (mkdir_p(dir, mask))
 159                 return -1;
 160
 161         *l = '/';
 162
 163         ret = mkdir(dir, mask);
 164         if (ret && errno == EEXIST)
 165                 return 0;
 166
 167         if (ret)
 168                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 169
 170         return ret;
 171 }
 172
 173 static void free_lease(struct lease *l)
 174 {
 175         if (l->head.next)
 176                 list_del(&l->head);
 177
 178         free(l->duid);
 179         free(l);
 180 }
 181
 182 static struct interface* get_interface(const char *name)
 183 {
 184         struct interface *c;
 185         list_for_each_entry(c, &interfaces, head)
 186                 if (!strcmp(c->name, name))
 187                         return c;
 188         return NULL;
 189 }
 190
 191 static void set_interface_defaults(struct interface *iface)
 192 {
 193         iface->managed = 1;
 194         iface->learn_routes = 1;
 195         iface->dhcpv4_leasetime = 43200;
 196         iface->ra_maxinterval = 600;
 197         iface->ra_mininterval = iface->ra_maxinterval/3;
 198         iface->ra_lifetime = -1;
 199 }
 200
 201 static void clean_interface(struct interface *iface)
 202 {
 203         free(iface->dns);
 204         free(iface->search);
 205         free(iface->upstream);
 206         free(iface->dhcpv4_router);
 207         free(iface->dhcpv4_dns);
 208         free(iface->dhcpv6_raw);
 209         free(iface->filter_class);
 210         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 211         set_interface_defaults(iface);
 212 }
 213
 214 static void close_interface(struct interface *iface)
 215 {
 216         if (iface->head.next)
 217                 list_del(&iface->head);
 218
 219         setup_router_interface(iface, false);
 220         setup_dhcpv6_interface(iface, false);
 221         setup_ndp_interface(iface, false);
 222         setup_dhcpv4_interface(iface, false);
 223
 224         clean_interface(iface);
 225         free(iface);
 226 }
 227
 228 static int parse_mode(const char *mode)
 229 {
 230         if (!strcmp(mode, "disabled"))
 231                 return RELAYD_DISABLED;
 232         else if (!strcmp(mode, "server"))
 233                 return RELAYD_SERVER;
 234         else if (!strcmp(mode, "relay"))
 235                 return RELAYD_RELAY;
 236         else if (!strcmp(mode, "hybrid"))
 237                 return RELAYD_HYBRID;
 238         else
 239                 return -1;
 240 }
 241
 242 static void set_config(struct uci_section *s)
 243 {
 244         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 245
 246         blob_buf_init(&b, 0);
 247         uci_to_blob(&b, s, &odhcpd_attr_list);
 248         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 249
 250         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 251                 config.legacy = blobmsg_get_bool(c);
 252
 253         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 254                 free(config.dhcp_statefile);
 255                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 256         }
 257
 258         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 259                 free(config.dhcp_cb);
 260                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 261         }
 262
 263         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 264                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 265
 266                 if (config.log_level != log_level) {
 267                         config.log_level = log_level;
 268                         setlogmask(LOG_UPTO(config.log_level));
 269                 }
 270         }
 271 }
 272
 273 static double parse_leasetime(struct blob_attr *c) {
 274         char *val = blobmsg_get_string(c), *endptr = NULL;
 275         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 276
 277         if (time && endptr && endptr[0]) {
 278                 if (endptr[0] == 's')
 279                         time *= 1;
 280                 else if (endptr[0] == 'm')
 281                         time *= 60;
 282                 else if (endptr[0] == 'h')
 283                         time *= 3600;
 284                 else if (endptr[0] == 'd')
 285                         time *= 24 * 3600;
 286                 else if (endptr[0] == 'w')
 287                         time *= 7 * 24 * 3600;
 288                 else
 289                         goto err;
 290         }
 291
 292         if (time < 60)
 293                 time = 60;
 294
 295         return time;
 296
 297 err:
 298         return -1;
 299 }
 300
 301 static int set_lease(struct uci_section *s)
 302 {
 303         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 304
 305         blob_buf_init(&b, 0);
 306         uci_to_blob(&b, s, &lease_attr_list);
 307         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 308
 309         size_t hostlen = 1;
 310         if ((c = tb[LEASE_ATTR_NAME]))
 311                 hostlen = blobmsg_data_len(c);
 312
 313         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 314         if (!lease)
 315                 goto err;
 316
 317         if (hostlen > 1)
 318                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 319
 320         if ((c = tb[LEASE_ATTR_IP]))
 321                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 322                         goto err;
 323
 324         if ((c = tb[LEASE_ATTR_MAC]))
 325                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 326                         goto err;
 327
 328         if ((c = tb[LEASE_ATTR_DUID])) {
 329                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 330                 lease->duid = malloc(duidlen);
 331                 if (!lease->duid)
 332                         goto err;
 333
 334                 ssize_t len = odhcpd_unhexlify(lease->duid,
 335                                 duidlen, blobmsg_get_string(c));
 336
 337                 if (len < 0)
 338                         goto err;
 339
 340                 lease->duid_len = len;
 341         }
 342
 343         if ((c = tb[LEASE_ATTR_HOSTID])) {
 344                 errno = 0;
 345                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 346                 if (errno)
 347                         goto err;
 348         }
 349
 350         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 351                 double time = parse_leasetime(c);
 352                 if (time < 0)
 353                         goto err;
 354
 355                 lease->dhcpv4_leasetime = time;
 356         }
 357
 358         list_add(&lease->head, &leases);
 359         return 0;
 360
 361 err:
 362         if (lease)
 363                 free_lease(lease);
 364
 365         return -1;
 366 }
 367
 368 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 369 {
 370         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 371         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 372
 373         if (tb[IFACE_ATTR_INTERFACE])
 374                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 375
 376         if (!name)
 377                 return -1;
 378
 379         struct interface *iface = get_interface(name);
 380         if (!iface) {
 381                 iface = calloc(1, sizeof(*iface));
 382                 if (!iface)
 383                         return -1;
 384
 385                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 386
 387                 set_interface_defaults(iface);
 388
 389                 list_add(&iface->head, &interfaces);
 390                 overwrite = true;
 391         }
 392
 393         const char *ifname = NULL;
 394         if (overwrite) {
 395                 if ((c = tb[IFACE_ATTR_IFNAME]))
 396                         ifname = blobmsg_get_string(c);
 397                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 398                         ifname = blobmsg_get_string(c);
 399         }
 400
 401 #ifdef WITH_UBUS
 402         if (overwrite || !iface->ifname[0])
 403                 ifname = ubus_get_ifname(name);
 404 #endif
 405
 406         if (!iface->ifname[0] && !ifname)
 407                 goto err;
 408
 409         if (ifname)
 410                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 411
 412         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 413                 goto err;
 414
 415         iface->inuse = true;
 416
 417         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 418                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 419
 420         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 421                 iface->ignore = blobmsg_get_bool(c);
 422
 423         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 424                 double time = parse_leasetime(c);
 425                 if (time < 0)
 426                         goto err;
 427
 428                 iface->dhcpv4_leasetime = time;
 429         }
 430
 431         if ((c = tb[IFACE_ATTR_START])) {
 432                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 433
 434                 if (config.legacy)
 435                         iface->dhcpv4 = RELAYD_SERVER;
 436         }
 437
 438         if ((c = tb[IFACE_ATTR_LIMIT]))
 439                 iface->dhcpv4_end.s_addr = htonl(
 440                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 441
 442         if ((c = tb[IFACE_ATTR_MASTER]))
 443                 iface->master = blobmsg_get_bool(c);
 444
 445         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 446                 struct blob_attr *cur;
 447                 unsigned rem;
 448
 449                 blobmsg_for_each_attr(cur, c, rem) {
 450                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 451                                 continue;
 452
 453                         iface->upstream = realloc(iface->upstream,
 454                                         iface->upstream_len + blobmsg_data_len(cur));
 455                         if (!iface->upstream)
 456                                 goto err;
 457
 458                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 459                         iface->upstream_len += blobmsg_data_len(cur);
 460                 }
 461         }
 462
 463         int mode;
 464         if ((c = tb[IFACE_ATTR_RA])) {
 465                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 466                         iface->ra = mode;
 467                 else
 468                         goto err;
 469         }
 470
 471         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 472                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 473                         iface->dhcpv4 = mode;
 474                 else
 475                         goto err;
 476         }
 477
 478         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 479                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 480                         iface->dhcpv6 = mode;
 481                 else
 482                         goto err;
 483         }
 484
 485         if ((c = tb[IFACE_ATTR_NDP])) {
 486                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 487                         iface->ndp = mode;
 488                 else
 489                         goto err;
 490         }
 491
 492         if ((c = tb[IFACE_ATTR_ROUTER])) {
 493                 struct blob_attr *cur;
 494                 unsigned rem;
 495
 496                 blobmsg_for_each_attr(cur, c, rem) {
 497                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 498                                 continue;
 499
 500                         struct in_addr addr4;
 501                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 502                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 503                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 504                                 if (!iface->dhcpv4_router)
 505                                         goto err;
 506
 507                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 508                         } else
 509                                 goto err;
 510                 }
 511         }
 512
 513         if ((c = tb[IFACE_ATTR_DNS])) {
 514                 struct blob_attr *cur;
 515                 unsigned rem;
 516
 517                 iface->always_rewrite_dns = true;
 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                         struct in_addr addr4;
 523                         struct in6_addr addr6;
 524                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 525                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 526                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 527                                 if (!iface->dhcpv4_dns)
 528                                         goto err;
 529
 530                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 531                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 532                                 iface->dns = realloc(iface->dns,
 533                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 534                                 if (!iface->dns)
 535                                         goto err;
 536
 537                                 iface->dns[iface->dns_cnt - 1] = addr6;
 538                         } else
 539                                 goto err;
 540                 }
 541         }
 542
 543         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 544                 struct blob_attr *cur;
 545                 unsigned rem;
 546
 547                 blobmsg_for_each_attr(cur, c, rem) {
 548                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 549                                 continue;
 550
 551                         uint8_t buf[256];
 552                         char *domain = blobmsg_get_string(cur);
 553                         size_t domainlen = strlen(domain);
 554                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 555                                 domain[domainlen - 1] = 0;
 556
 557                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 558                         if (len <= 0)
 559                                 goto err;
 560
 561                         iface->search = realloc(iface->search, iface->search_len + len);
 562                         if (!iface->search)
 563                                 goto err;
 564
 565                         memcpy(&iface->search[iface->search_len], buf, len);
 566                         iface->search_len += len;
 567                 }
 568         }
 569
 570         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 571                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 572                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 573         }
 574
 575         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 576                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 577                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 578                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 579         }
 580
 581         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 582                 iface->default_router = blobmsg_get_u32(c);
 583
 584         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 585                 iface->managed = blobmsg_get_u32(c);
 586
 587         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 588                 iface->ra_not_onlink = blobmsg_get_bool(c);
 589
 590         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 591                 iface->ra_advrouter = blobmsg_get_bool(c);
 592
 593         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 594                 iface->ra_mininterval =  blobmsg_get_u32(c);
 595
 596         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 597                 iface->ra_maxinterval = blobmsg_get_u32(c);
 598
 599         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 600                 iface->ra_lifetime = blobmsg_get_u32(c);
 601
 602         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 603                 const char *prio = blobmsg_get_string(c);
 604
 605                 if (!strcmp(prio, "high"))
 606                         iface->route_preference = 1;
 607                 else if (!strcmp(prio, "low"))
 608                         iface->route_preference = -1;
 609                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 610                         iface->route_preference = 0;
 611                 else
 612                         goto err;
 613         }
 614
 615         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 616                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 617                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 618
 619         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 620                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 621                 goto err;
 622
 623         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 624                 iface->learn_routes = blobmsg_get_bool(c);
 625
 626         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 627                 iface->external = blobmsg_get_bool(c);
 628
 629         return 0;
 630
 631 err:
 632         close_interface(iface);
 633         return -1;
 634 }
 635
 636 static int set_interface(struct uci_section *s)
 637 {
 638         blob_buf_init(&b, 0);
 639         uci_to_blob(&b, s, &interface_attr_list);
 640
 641         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 642 }
 643
 644 void odhcpd_reload(void)
 645 {
 646         struct uci_context *uci = uci_alloc_context();
 647
 648         while (!list_empty(&leases))
 649                 free_lease(list_first_entry(&leases, struct lease, head));
 650
 651         struct interface *master = NULL, *i, *n;
 652
 653         if (!uci)
 654                 return;
 655
 656         list_for_each_entry(i, &interfaces, head)
 657                 clean_interface(i);
 658
 659         struct uci_package *dhcp = NULL;
 660         if (!uci_load(uci, "dhcp", &dhcp)) {
 661                 struct uci_element *e;
 662                 uci_foreach_element(&dhcp->sections, e) {
 663                         struct uci_section *s = uci_to_section(e);
 664                         if (!strcmp(s->type, "host"))
 665                                 set_lease(s);
 666                         else if (!strcmp(s->type, "odhcpd"))
 667                                 set_config(s);
 668                 }
 669
 670                 uci_foreach_element(&dhcp->sections, e) {
 671                         struct uci_section *s = uci_to_section(e);
 672                         if (!strcmp(s->type, "dhcp"))
 673                                 set_interface(s);
 674                 }
 675         }
 676
 677         if (config.dhcp_statefile) {
 678                 char *path = strdup(config.dhcp_statefile);
 679
 680                 mkdir_p(dirname(path), 0755);
 681                 free(path);
 682         }
 683
 684 #ifdef WITH_UBUS
 685         ubus_apply_network();
 686 #endif
 687
 688         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 689
 690         /* Test for */
 691         list_for_each_entry(i, &interfaces, head) {
 692                 if (i->master)
 693                         continue;
 694
 695                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 696                         any_dhcpv6_slave = true;
 697
 698                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 699                         any_ra_slave = true;
 700
 701                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 702                         any_ndp_slave = true;
 703         }
 704
 705         /* Evaluate hybrid mode for master */
 706         list_for_each_entry(i, &interfaces, head) {
 707                 if (!i->master)
 708                         continue;
 709
 710                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 711 #ifdef WITH_UBUS
 712                 if (!ubus_has_prefix(i->name, i->ifname))
 713                         hybrid_mode = RELAYD_RELAY;
 714 #endif
 715
 716                 if (i->dhcpv6 == RELAYD_HYBRID)
 717                         i->dhcpv6 = hybrid_mode;
 718
 719                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 720                         i->dhcpv6 = RELAYD_DISABLED;
 721
 722                 if (i->ra == RELAYD_HYBRID)
 723                         i->ra = hybrid_mode;
 724
 725                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 726                         i->ra = RELAYD_DISABLED;
 727
 728                 if (i->ndp == RELAYD_HYBRID)
 729                         i->ndp = hybrid_mode;
 730
 731                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 732                         i->ndp = RELAYD_DISABLED;
 733
 734                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 735                         master = i;
 736         }
 737
 738
 739         list_for_each_entry_safe(i, n, &interfaces, head) {
 740                 if (i->inuse) {
 741                         /* Resolve hybrid mode */
 742                         if (i->dhcpv6 == RELAYD_HYBRID)
 743                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 744                                                 RELAYD_RELAY : RELAYD_SERVER;
 745
 746                         if (i->ra == RELAYD_HYBRID)
 747                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 748                                                 RELAYD_RELAY : RELAYD_SERVER;
 749
 750                         if (i->ndp == RELAYD_HYBRID)
 751                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 752                                                 RELAYD_RELAY : RELAYD_DISABLED;
 753
 754                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 755                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 756                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 757                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 758                 } else {
 759                         close_interface(i);
 760                 }
 761         }
 762
 763         uci_unload(uci, dhcp);
 764         uci_free_context(uci);
 765 }
 766
 767 static void handle_signal(int signal)
 768 {
 769         char b[1] = {0};
 770
 771         if (signal == SIGHUP) {
 772                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 773         } else
 774                 uloop_end();
 775 }
 776
 777 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 778 {
 779         char b[512];
 780         if (read(u->fd, b, sizeof(b)) < 0) {}
 781
 782         odhcpd_reload();
 783 }
 784
 785 static struct uloop_fd reload_fd = { .cb = reload_cb };
 786
 787 void odhcpd_run(void)
 788 {
 789         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 790
 791         reload_fd.fd = reload_pipe[0];
 792         uloop_fd_add(&reload_fd, ULOOP_READ);
 793
 794         signal(SIGTERM, handle_signal);
 795         signal(SIGINT, handle_signal);
 796         signal(SIGHUP, handle_signal);
 797
 798 #ifdef WITH_UBUS
 799         while (init_ubus())
 800                 sleep(1);
 801 #endif
 802
 803         odhcpd_reload();
 804         uloop_run();
 805
 806         while (!list_empty(&interfaces))
 807                 close_interface(list_first_entry(&interfaces, struct interface, head));
 808 }
 809