src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <net/if.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <syslog.h>
  11
  12 #include <uci.h>
  13 #include <uci_blob.h>
  14 #include <libubox/utils.h>
  15
  16 #include "odhcpd.h"
  17
  18 static struct blob_buf b;
  19 static int reload_pipe[2];
  20 struct list_head leases = LIST_HEAD_INIT(leases);
  21 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  22 struct config config = {.legacy = false, .main_dhcpv4 = false,
  23                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  24                         .log_level = LOG_INFO};
  25
  26 enum {
  27         IFACE_ATTR_INTERFACE,
  28         IFACE_ATTR_IFNAME,
  29         IFACE_ATTR_NETWORKID,
  30         IFACE_ATTR_DYNAMICDHCP,
  31         IFACE_ATTR_IGNORE,
  32         IFACE_ATTR_LEASETIME,
  33         IFACE_ATTR_LIMIT,
  34         IFACE_ATTR_START,
  35         IFACE_ATTR_MASTER,
  36         IFACE_ATTR_UPSTREAM,
  37         IFACE_ATTR_RA,
  38         IFACE_ATTR_DHCPV4,
  39         IFACE_ATTR_DHCPV6,
  40         IFACE_ATTR_NDP,
  41         IFACE_ATTR_ROUTER,
  42         IFACE_ATTR_DNS,
  43         IFACE_ATTR_DOMAIN,
  44         IFACE_ATTR_FILTER_CLASS,
  45         IFACE_ATTR_DHCPV6_RAW,
  46         IFACE_ATTR_RA_DEFAULT,
  47         IFACE_ATTR_RA_MANAGEMENT,
  48         IFACE_ATTR_RA_OFFLINK,
  49         IFACE_ATTR_RA_PREFERENCE,
  50         IFACE_ATTR_RA_ADVROUTER,
  51         IFACE_ATTR_RA_MININTERVAL,
  52         IFACE_ATTR_RA_MAXINTERVAL,
  53         IFACE_ATTR_RA_LIFETIME,
  54         IFACE_ATTR_RA_USELEASETIME,
  55         IFACE_ATTR_RA_REACHABLETIME,
  56         IFACE_ATTR_RA_RETRANSTIME,
  57         IFACE_ATTR_RA_HOPLIMIT,
  58         IFACE_ATTR_RA_MTU,
  59         IFACE_ATTR_PD_MANAGER,
  60         IFACE_ATTR_PD_CER,
  61         IFACE_ATTR_NDPROXY_ROUTING,
  62         IFACE_ATTR_NDPROXY_SLAVE,
  63         IFACE_ATTR_MAX
  64 };
  65
  66 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  67         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  71         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  74         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  75         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  76         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  82         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  83         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  84         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  89         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  92         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  97         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
  98         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
  99         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 102         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 103 };
 104
 105 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 106         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 107         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 108         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 109 };
 110
 111 const struct uci_blob_param_list interface_attr_list = {
 112         .n_params = IFACE_ATTR_MAX,
 113         .params = iface_attrs,
 114         .info = iface_attr_info,
 115 };
 116
 117 enum {
 118         LEASE_ATTR_IP,
 119         LEASE_ATTR_MAC,
 120         LEASE_ATTR_DUID,
 121         LEASE_ATTR_HOSTID,
 122         LEASE_ATTR_LEASETIME,
 123         LEASE_ATTR_NAME,
 124         LEASE_ATTR_MAX
 125 };
 126
 127 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 128         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 129         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 130         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 131         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 132         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 133         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 134 };
 135
 136 const struct uci_blob_param_list lease_attr_list = {
 137         .n_params = LEASE_ATTR_MAX,
 138         .params = lease_attrs,
 139 };
 140
 141 enum {
 142         ODHCPD_ATTR_LEGACY,
 143         ODHCPD_ATTR_MAINDHCP,
 144         ODHCPD_ATTR_LEASEFILE,
 145         ODHCPD_ATTR_LEASETRIGGER,
 146         ODHCPD_ATTR_LOGLEVEL,
 147         ODHCPD_ATTR_MAX
 148 };
 149
 150 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 151         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 152         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 153         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 154         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 155         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 156 };
 157
 158 const struct uci_blob_param_list odhcpd_attr_list = {
 159         .n_params = ODHCPD_ATTR_MAX,
 160         .params = odhcpd_attrs,
 161 };
 162
 163 static int mkdir_p(char *dir, mode_t mask)
 164 {
 165         char *l = strrchr(dir, '/');
 166         int ret;
 167
 168         if (!l)
 169                 return 0;
 170
 171         *l = '\0';
 172
 173         if (mkdir_p(dir, mask))
 174                 return -1;
 175
 176         *l = '/';
 177
 178         ret = mkdir(dir, mask);
 179         if (ret && errno == EEXIST)
 180                 return 0;
 181
 182         if (ret)
 183                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 184
 185         return ret;
 186 }
 187
 188 static void free_lease(struct lease *l)
 189 {
 190         if (l->head.next)
 191                 list_del(&l->head);
 192
 193         free(l->duid);
 194         free(l);
 195 }
 196
 197 static struct interface* get_interface(const char *name)
 198 {
 199         struct interface *c;
 200         list_for_each_entry(c, &interfaces, head)
 201                 if (!strcmp(c->name, name))
 202                         return c;
 203         return NULL;
 204 }
 205
 206 static void set_interface_defaults(struct interface *iface)
 207 {
 208         iface->ra_managed = RA_MANAGED_MFLAG;
 209         iface->learn_routes = 1;
 210         iface->dhcpv4_leasetime = 43200;
 211         iface->ra_maxinterval = 600;
 212         iface->ra_mininterval = iface->ra_maxinterval/3;
 213         iface->ra_lifetime = -1;
 214 }
 215
 216 static void clean_interface(struct interface *iface)
 217 {
 218         free(iface->dns);
 219         free(iface->search);
 220         free(iface->upstream);
 221         free(iface->dhcpv4_router);
 222         free(iface->dhcpv4_dns);
 223         free(iface->dhcpv6_raw);
 224         free(iface->filter_class);
 225         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 226         set_interface_defaults(iface);
 227 }
 228
 229 static void close_interface(struct interface *iface)
 230 {
 231         if (iface->head.next)
 232                 list_del(&iface->head);
 233
 234         setup_router_interface(iface, false);
 235         setup_dhcpv6_interface(iface, false);
 236         setup_ndp_interface(iface, false);
 237         setup_dhcpv4_interface(iface, false);
 238
 239         clean_interface(iface);
 240         free(iface->ia_addr);
 241         free(iface->ifname);
 242         free(iface);
 243 }
 244
 245 static int parse_mode(const char *mode)
 246 {
 247         if (!strcmp(mode, "disabled"))
 248                 return RELAYD_DISABLED;
 249         else if (!strcmp(mode, "server"))
 250                 return RELAYD_SERVER;
 251         else if (!strcmp(mode, "relay"))
 252                 return RELAYD_RELAY;
 253         else if (!strcmp(mode, "hybrid"))
 254                 return RELAYD_HYBRID;
 255         else
 256                 return -1;
 257 }
 258
 259 static void set_config(struct uci_section *s)
 260 {
 261         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 262
 263         blob_buf_init(&b, 0);
 264         uci_to_blob(&b, s, &odhcpd_attr_list);
 265         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 266
 267         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 268                 config.legacy = blobmsg_get_bool(c);
 269
 270         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 271                 config.main_dhcpv4 = blobmsg_get_bool(c);
 272
 273         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 274                 free(config.dhcp_statefile);
 275                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 276         }
 277
 278         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 279                 free(config.dhcp_cb);
 280                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 281         }
 282
 283         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 284                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 285
 286                 if (config.log_level != log_level) {
 287                         config.log_level = log_level;
 288                         setlogmask(LOG_UPTO(config.log_level));
 289                 }
 290         }
 291 }
 292
 293 static double parse_leasetime(struct blob_attr *c) {
 294         char *val = blobmsg_get_string(c), *endptr = NULL;
 295         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 296
 297         if (time && endptr && endptr[0]) {
 298                 if (endptr[0] == 's')
 299                         time *= 1;
 300                 else if (endptr[0] == 'm')
 301                         time *= 60;
 302                 else if (endptr[0] == 'h')
 303                         time *= 3600;
 304                 else if (endptr[0] == 'd')
 305                         time *= 24 * 3600;
 306                 else if (endptr[0] == 'w')
 307                         time *= 7 * 24 * 3600;
 308                 else
 309                         goto err;
 310         }
 311
 312         if (time < 60)
 313                 time = 60;
 314
 315         return time;
 316
 317 err:
 318         return -1;
 319 }
 320
 321 static int set_lease(struct uci_section *s)
 322 {
 323         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 324
 325         blob_buf_init(&b, 0);
 326         uci_to_blob(&b, s, &lease_attr_list);
 327         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 328
 329         size_t hostlen = 1;
 330         if ((c = tb[LEASE_ATTR_NAME]))
 331                 hostlen = blobmsg_data_len(c);
 332
 333         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 334         if (!lease)
 335                 goto err;
 336
 337         if (hostlen > 1)
 338                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 339
 340         if ((c = tb[LEASE_ATTR_IP]))
 341                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 342                         goto err;
 343
 344         if ((c = tb[LEASE_ATTR_MAC]))
 345                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 346                         goto err;
 347
 348         if ((c = tb[LEASE_ATTR_DUID])) {
 349                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 350                 lease->duid = malloc(duidlen);
 351                 if (!lease->duid)
 352                         goto err;
 353
 354                 ssize_t len = odhcpd_unhexlify(lease->duid,
 355                                 duidlen, blobmsg_get_string(c));
 356
 357                 if (len < 0)
 358                         goto err;
 359
 360                 lease->duid_len = len;
 361         }
 362
 363         if ((c = tb[LEASE_ATTR_HOSTID])) {
 364                 errno = 0;
 365                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 366                 if (errno)
 367                         goto err;
 368         }
 369
 370         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 371                 double time = parse_leasetime(c);
 372                 if (time < 0)
 373                         goto err;
 374
 375                 lease->dhcpv4_leasetime = time;
 376         }
 377
 378         list_add(&lease->head, &leases);
 379         return 0;
 380
 381 err:
 382         if (lease)
 383                 free_lease(lease);
 384
 385         return -1;
 386 }
 387
 388 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 389 {
 390         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 391         bool get_addrs = false;
 392
 393         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 394
 395         if (tb[IFACE_ATTR_INTERFACE])
 396                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 397
 398         if (!name)
 399                 return -1;
 400
 401         struct interface *iface = get_interface(name);
 402         if (!iface) {
 403                 char *iface_name;
 404
 405                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 406                 if (!iface)
 407                         return -1;
 408
 409                 iface->name = strcpy(iface_name, name);
 410
 411                 set_interface_defaults(iface);
 412
 413                 list_add(&iface->head, &interfaces);
 414                 get_addrs = overwrite = true;
 415         }
 416
 417         const char *ifname = NULL;
 418         if (overwrite) {
 419                 if ((c = tb[IFACE_ATTR_IFNAME]))
 420                         ifname = blobmsg_get_string(c);
 421                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 422                         ifname = blobmsg_get_string(c);
 423         }
 424
 425 #ifdef WITH_UBUS
 426         if (overwrite || !iface->ifname)
 427                 ifname = ubus_get_ifname(name);
 428 #endif
 429
 430         if (!iface->ifname && !ifname)
 431                 goto err;
 432
 433         if (ifname) {
 434                 free(iface->ifname);
 435                 iface->ifname = strdup(ifname);
 436
 437                 if (!iface->ifname)
 438                         goto err;
 439         }
 440
 441         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 442                 goto err;
 443
 444         if (get_addrs) {
 445                 ssize_t len = odhcpd_get_interface_addresses(iface->ifindex,
 446                                                 true, &iface->ia_addr);
 447
 448                 if (len > 0)
 449                         iface->ia_addr_len = len;
 450         }
 451
 452         iface->inuse = true;
 453
 454         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 455                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 456
 457         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 458                 iface->ignore = blobmsg_get_bool(c);
 459
 460         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 461                 double time = parse_leasetime(c);
 462                 if (time < 0)
 463                         goto err;
 464
 465                 iface->dhcpv4_leasetime = time;
 466         }
 467
 468         if ((c = tb[IFACE_ATTR_START])) {
 469                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 470
 471                 if (config.main_dhcpv4 && config.legacy)
 472                         iface->dhcpv4 = RELAYD_SERVER;
 473         }
 474
 475         if ((c = tb[IFACE_ATTR_LIMIT]))
 476                 iface->dhcpv4_end.s_addr = htonl(
 477                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 478
 479         if ((c = tb[IFACE_ATTR_MASTER]))
 480                 iface->master = blobmsg_get_bool(c);
 481
 482         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 483                 struct blob_attr *cur;
 484                 unsigned rem;
 485
 486                 blobmsg_for_each_attr(cur, c, rem) {
 487                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 488                                 continue;
 489
 490                         iface->upstream = realloc(iface->upstream,
 491                                         iface->upstream_len + blobmsg_data_len(cur));
 492                         if (!iface->upstream)
 493                                 goto err;
 494
 495                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 496                         iface->upstream_len += blobmsg_data_len(cur);
 497                 }
 498         }
 499
 500         int mode;
 501         if ((c = tb[IFACE_ATTR_RA])) {
 502                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 503                         iface->ra = mode;
 504                 else
 505                         goto err;
 506         }
 507
 508         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 509                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 510                         if (config.main_dhcpv4)
 511                                 iface->dhcpv4 = mode;
 512                 }
 513                 else
 514                         goto err;
 515         }
 516
 517         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 518                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 519                         iface->dhcpv6 = mode;
 520                 else
 521                         goto err;
 522         }
 523
 524         if ((c = tb[IFACE_ATTR_NDP])) {
 525                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 526                         iface->ndp = mode;
 527                 else
 528                         goto err;
 529         }
 530
 531         if ((c = tb[IFACE_ATTR_ROUTER])) {
 532                 struct blob_attr *cur;
 533                 unsigned rem;
 534
 535                 blobmsg_for_each_attr(cur, c, rem) {
 536                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 537                                 continue;
 538
 539                         struct in_addr addr4;
 540                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 541                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 542                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 543                                 if (!iface->dhcpv4_router)
 544                                         goto err;
 545
 546                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 547                         } else
 548                                 goto err;
 549                 }
 550         }
 551
 552         if ((c = tb[IFACE_ATTR_DNS])) {
 553                 struct blob_attr *cur;
 554                 unsigned rem;
 555
 556                 iface->always_rewrite_dns = true;
 557                 blobmsg_for_each_attr(cur, c, rem) {
 558                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 559                                 continue;
 560
 561                         struct in_addr addr4;
 562                         struct in6_addr addr6;
 563                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 564                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 565                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 566                                 if (!iface->dhcpv4_dns)
 567                                         goto err;
 568
 569                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 570                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 571                                 iface->dns = realloc(iface->dns,
 572                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 573                                 if (!iface->dns)
 574                                         goto err;
 575
 576                                 iface->dns[iface->dns_cnt - 1] = addr6;
 577                         } else
 578                                 goto err;
 579                 }
 580         }
 581
 582         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 583                 struct blob_attr *cur;
 584                 unsigned rem;
 585
 586                 blobmsg_for_each_attr(cur, c, rem) {
 587                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 588                                 continue;
 589
 590                         uint8_t buf[256];
 591                         char *domain = blobmsg_get_string(cur);
 592                         size_t domainlen = strlen(domain);
 593                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 594                                 domain[domainlen - 1] = 0;
 595
 596                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 597                         if (len <= 0)
 598                                 goto err;
 599
 600                         iface->search = realloc(iface->search, iface->search_len + len);
 601                         if (!iface->search)
 602                                 goto err;
 603
 604                         memcpy(&iface->search[iface->search_len], buf, len);
 605                         iface->search_len += len;
 606                 }
 607         }
 608
 609         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 610                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 611                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 612         }
 613
 614         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 615                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 616                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 617                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 618         }
 619
 620         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 621                 iface->default_router = blobmsg_get_u32(c);
 622
 623         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 624                 iface->ra_managed = blobmsg_get_u32(c);
 625
 626         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 627                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 628                 if (ra_reachabletime > 3600000)
 629                         goto err;
 630
 631                 iface->ra_reachabletime = ra_reachabletime;
 632         }
 633
 634         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 635                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 636                 if (ra_retranstime > 60000)
 637                         goto err;
 638
 639                 iface->ra_retranstime = ra_retranstime;
 640         }
 641
 642         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 643                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 644                 if (ra_hoplimit > 255)
 645                         goto err;
 646
 647                 iface->ra_hoplimit = ra_hoplimit;
 648         }
 649
 650         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 651                 uint32_t ra_mtu = blobmsg_get_u32(c);
 652                 if (ra_mtu < 1280 || ra_mtu > 65535)
 653                         goto err;
 654
 655                 iface->ra_mtu = ra_mtu;
 656         }
 657
 658         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 659                 iface->ra_not_onlink = blobmsg_get_bool(c);
 660
 661         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 662                 iface->ra_advrouter = blobmsg_get_bool(c);
 663
 664         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 665                 iface->ra_mininterval =  blobmsg_get_u32(c);
 666
 667         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 668                 iface->ra_maxinterval = blobmsg_get_u32(c);
 669
 670         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 671                 iface->ra_lifetime = blobmsg_get_u32(c);
 672
 673         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 674                 iface->ra_useleasetime = blobmsg_get_bool(c);
 675
 676         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 677                 const char *prio = blobmsg_get_string(c);
 678
 679                 if (!strcmp(prio, "high"))
 680                         iface->route_preference = 1;
 681                 else if (!strcmp(prio, "low"))
 682                         iface->route_preference = -1;
 683                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 684                         iface->route_preference = 0;
 685                 else
 686                         goto err;
 687         }
 688
 689         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 690                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 691                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 692
 693         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 694                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 695                 goto err;
 696
 697         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 698                 iface->learn_routes = blobmsg_get_bool(c);
 699
 700         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 701                 iface->external = blobmsg_get_bool(c);
 702
 703         return 0;
 704
 705 err:
 706         close_interface(iface);
 707         return -1;
 708 }
 709
 710 static int set_interface(struct uci_section *s)
 711 {
 712         blob_buf_init(&b, 0);
 713         uci_to_blob(&b, s, &interface_attr_list);
 714
 715         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 716 }
 717
 718 void odhcpd_reload(void)
 719 {
 720         struct uci_context *uci = uci_alloc_context();
 721
 722         while (!list_empty(&leases))
 723                 free_lease(list_first_entry(&leases, struct lease, head));
 724
 725         struct interface *master = NULL, *i, *n;
 726
 727         if (!uci)
 728                 return;
 729
 730         list_for_each_entry(i, &interfaces, head)
 731                 clean_interface(i);
 732
 733         struct uci_package *dhcp = NULL;
 734         if (!uci_load(uci, "dhcp", &dhcp)) {
 735                 struct uci_element *e;
 736                 uci_foreach_element(&dhcp->sections, e) {
 737                         struct uci_section *s = uci_to_section(e);
 738                         if (!strcmp(s->type, "host"))
 739                                 set_lease(s);
 740                         else if (!strcmp(s->type, "odhcpd"))
 741                                 set_config(s);
 742                 }
 743
 744                 uci_foreach_element(&dhcp->sections, e) {
 745                         struct uci_section *s = uci_to_section(e);
 746                         if (!strcmp(s->type, "dhcp"))
 747                                 set_interface(s);
 748                 }
 749         }
 750
 751         if (config.dhcp_statefile) {
 752                 char *path = strdup(config.dhcp_statefile);
 753
 754                 mkdir_p(dirname(path), 0755);
 755                 free(path);
 756         }
 757
 758 #ifdef WITH_UBUS
 759         ubus_apply_network();
 760 #endif
 761
 762         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 763
 764         /* Test for */
 765         list_for_each_entry(i, &interfaces, head) {
 766                 if (i->master)
 767                         continue;
 768
 769                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 770                         any_dhcpv6_slave = true;
 771
 772                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 773                         any_ra_slave = true;
 774
 775                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 776                         any_ndp_slave = true;
 777         }
 778
 779         /* Evaluate hybrid mode for master */
 780         list_for_each_entry(i, &interfaces, head) {
 781                 if (!i->master)
 782                         continue;
 783
 784                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 785 #ifdef WITH_UBUS
 786                 if (!ubus_has_prefix(i->name, i->ifname))
 787                         hybrid_mode = RELAYD_RELAY;
 788 #endif
 789
 790                 if (i->dhcpv6 == RELAYD_HYBRID)
 791                         i->dhcpv6 = hybrid_mode;
 792
 793                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 794                         i->dhcpv6 = RELAYD_DISABLED;
 795
 796                 if (i->ra == RELAYD_HYBRID)
 797                         i->ra = hybrid_mode;
 798
 799                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 800                         i->ra = RELAYD_DISABLED;
 801
 802                 if (i->ndp == RELAYD_HYBRID)
 803                         i->ndp = hybrid_mode;
 804
 805                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 806                         i->ndp = RELAYD_DISABLED;
 807
 808                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 809                         master = i;
 810         }
 811
 812
 813         list_for_each_entry_safe(i, n, &interfaces, head) {
 814                 if (i->inuse) {
 815                         /* Resolve hybrid mode */
 816                         if (i->dhcpv6 == RELAYD_HYBRID)
 817                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 818                                                 RELAYD_RELAY : RELAYD_SERVER;
 819
 820                         if (i->ra == RELAYD_HYBRID)
 821                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 822                                                 RELAYD_RELAY : RELAYD_SERVER;
 823
 824                         if (i->ndp == RELAYD_HYBRID)
 825                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 826                                                 RELAYD_RELAY : RELAYD_DISABLED;
 827
 828                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 829                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 830                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 831                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 832                 } else
 833                         close_interface(i);
 834         }
 835
 836         uci_unload(uci, dhcp);
 837         uci_free_context(uci);
 838 }
 839
 840 static void handle_signal(int signal)
 841 {
 842         char b[1] = {0};
 843
 844         if (signal == SIGHUP) {
 845                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 846         } else
 847                 uloop_end();
 848 }
 849
 850 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 851 {
 852         char b[512];
 853         if (read(u->fd, b, sizeof(b)) < 0) {}
 854
 855         odhcpd_reload();
 856 }
 857
 858 static struct uloop_fd reload_fd = { .cb = reload_cb };
 859
 860 void odhcpd_run(void)
 861 {
 862         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 863
 864         reload_fd.fd = reload_pipe[0];
 865         uloop_fd_add(&reload_fd, ULOOP_READ);
 866
 867         signal(SIGTERM, handle_signal);
 868         signal(SIGINT, handle_signal);
 869         signal(SIGHUP, handle_signal);
 870
 871 #ifdef WITH_UBUS
 872         while (init_ubus())
 873                 sleep(1);
 874 #endif
 875
 876         odhcpd_reload();
 877         uloop_run();
 878
 879         while (!list_empty(&interfaces))
 880                 close_interface(list_first_entry(&interfaces, struct interface, head));
 881 }
 882