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_DHCPV6_ASSIGNALL,
  47         IFACE_ATTR_RA_DEFAULT,
  48         IFACE_ATTR_RA_MANAGEMENT,
  49         IFACE_ATTR_RA_OFFLINK,
  50         IFACE_ATTR_RA_PREFERENCE,
  51         IFACE_ATTR_RA_ADVROUTER,
  52         IFACE_ATTR_RA_MININTERVAL,
  53         IFACE_ATTR_RA_MAXINTERVAL,
  54         IFACE_ATTR_RA_LIFETIME,
  55         IFACE_ATTR_RA_USELEASETIME,
  56         IFACE_ATTR_RA_REACHABLETIME,
  57         IFACE_ATTR_RA_RETRANSTIME,
  58         IFACE_ATTR_RA_HOPLIMIT,
  59         IFACE_ATTR_RA_MTU,
  60         IFACE_ATTR_PD_MANAGER,
  61         IFACE_ATTR_PD_CER,
  62         IFACE_ATTR_NDPROXY_ROUTING,
  63         IFACE_ATTR_NDPROXY_SLAVE,
  64         IFACE_ATTR_MAX
  65 };
  66
  67 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  68         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  73         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  75         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  76         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  77         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  83         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  84         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  85         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  88         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  95         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  97         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  98         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  99         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 102         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 103         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 105 };
 106
 107 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 108         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 109         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 110         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 111 };
 112
 113 const struct uci_blob_param_list interface_attr_list = {
 114         .n_params = IFACE_ATTR_MAX,
 115         .params = iface_attrs,
 116         .info = iface_attr_info,
 117 };
 118
 119 enum {
 120         LEASE_ATTR_IP,
 121         LEASE_ATTR_MAC,
 122         LEASE_ATTR_DUID,
 123         LEASE_ATTR_HOSTID,
 124         LEASE_ATTR_LEASETIME,
 125         LEASE_ATTR_NAME,
 126         LEASE_ATTR_MAX
 127 };
 128
 129 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 130         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 131         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 132         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 133         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 134         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 135         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 136 };
 137
 138 const struct uci_blob_param_list lease_attr_list = {
 139         .n_params = LEASE_ATTR_MAX,
 140         .params = lease_attrs,
 141 };
 142
 143 enum {
 144         ODHCPD_ATTR_LEGACY,
 145         ODHCPD_ATTR_MAINDHCP,
 146         ODHCPD_ATTR_LEASEFILE,
 147         ODHCPD_ATTR_LEASETRIGGER,
 148         ODHCPD_ATTR_LOGLEVEL,
 149         ODHCPD_ATTR_MAX
 150 };
 151
 152 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 153         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 154         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 155         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 156         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 157         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 158 };
 159
 160 const struct uci_blob_param_list odhcpd_attr_list = {
 161         .n_params = ODHCPD_ATTR_MAX,
 162         .params = odhcpd_attrs,
 163 };
 164
 165 static int mkdir_p(char *dir, mode_t mask)
 166 {
 167         char *l = strrchr(dir, '/');
 168         int ret;
 169
 170         if (!l)
 171                 return 0;
 172
 173         *l = '\0';
 174
 175         if (mkdir_p(dir, mask))
 176                 return -1;
 177
 178         *l = '/';
 179
 180         ret = mkdir(dir, mask);
 181         if (ret && errno == EEXIST)
 182                 return 0;
 183
 184         if (ret)
 185                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 186
 187         return ret;
 188 }
 189
 190 static void free_lease(struct lease *l)
 191 {
 192         if (l->head.next)
 193                 list_del(&l->head);
 194
 195         free(l->duid);
 196         free(l);
 197 }
 198
 199 static struct interface* get_interface(const char *name)
 200 {
 201         struct interface *c;
 202         list_for_each_entry(c, &interfaces, head)
 203                 if (!strcmp(c->name, name))
 204                         return c;
 205         return NULL;
 206 }
 207
 208 static void set_interface_defaults(struct interface *iface)
 209 {
 210         iface->learn_routes = 1;
 211         iface->dhcpv4_leasetime = 43200;
 212         iface->dhcpv6_assignall = true;
 213         iface->ra_managed = RA_MANAGED_MFLAG;
 214         iface->ra_maxinterval = 600;
 215         iface->ra_mininterval = iface->ra_maxinterval/3;
 216         iface->ra_lifetime = -1;
 217 }
 218
 219 static void clean_interface(struct interface *iface)
 220 {
 221         free(iface->dns);
 222         free(iface->search);
 223         free(iface->upstream);
 224         free(iface->dhcpv4_router);
 225         free(iface->dhcpv4_dns);
 226         free(iface->dhcpv6_raw);
 227         free(iface->filter_class);
 228         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 229         set_interface_defaults(iface);
 230 }
 231
 232 static void close_interface(struct interface *iface)
 233 {
 234         if (iface->head.next)
 235                 list_del(&iface->head);
 236
 237         setup_router_interface(iface, false);
 238         setup_dhcpv6_interface(iface, false);
 239         setup_ndp_interface(iface, false);
 240         setup_dhcpv4_interface(iface, false);
 241
 242         clean_interface(iface);
 243         free(iface->ia_addr);
 244         free(iface->ifname);
 245         free(iface);
 246 }
 247
 248 static int parse_mode(const char *mode)
 249 {
 250         if (!strcmp(mode, "disabled"))
 251                 return RELAYD_DISABLED;
 252         else if (!strcmp(mode, "server"))
 253                 return RELAYD_SERVER;
 254         else if (!strcmp(mode, "relay"))
 255                 return RELAYD_RELAY;
 256         else if (!strcmp(mode, "hybrid"))
 257                 return RELAYD_HYBRID;
 258         else
 259                 return -1;
 260 }
 261
 262 static void set_config(struct uci_section *s)
 263 {
 264         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 265
 266         blob_buf_init(&b, 0);
 267         uci_to_blob(&b, s, &odhcpd_attr_list);
 268         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 269
 270         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 271                 config.legacy = blobmsg_get_bool(c);
 272
 273         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 274                 config.main_dhcpv4 = blobmsg_get_bool(c);
 275
 276         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 277                 free(config.dhcp_statefile);
 278                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 279         }
 280
 281         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 282                 free(config.dhcp_cb);
 283                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 284         }
 285
 286         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 287                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 288
 289                 if (config.log_level != log_level) {
 290                         config.log_level = log_level;
 291                         setlogmask(LOG_UPTO(config.log_level));
 292                 }
 293         }
 294 }
 295
 296 static double parse_leasetime(struct blob_attr *c) {
 297         char *val = blobmsg_get_string(c), *endptr = NULL;
 298         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 299
 300         if (time && endptr && endptr[0]) {
 301                 if (endptr[0] == 's')
 302                         time *= 1;
 303                 else if (endptr[0] == 'm')
 304                         time *= 60;
 305                 else if (endptr[0] == 'h')
 306                         time *= 3600;
 307                 else if (endptr[0] == 'd')
 308                         time *= 24 * 3600;
 309                 else if (endptr[0] == 'w')
 310                         time *= 7 * 24 * 3600;
 311                 else
 312                         goto err;
 313         }
 314
 315         if (time < 60)
 316                 time = 60;
 317
 318         return time;
 319
 320 err:
 321         return -1;
 322 }
 323
 324 static int set_lease(struct uci_section *s)
 325 {
 326         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 327
 328         blob_buf_init(&b, 0);
 329         uci_to_blob(&b, s, &lease_attr_list);
 330         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 331
 332         size_t hostlen = 1;
 333         if ((c = tb[LEASE_ATTR_NAME]))
 334                 hostlen = blobmsg_data_len(c);
 335
 336         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 337         if (!lease)
 338                 goto err;
 339
 340         if (hostlen > 1)
 341                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 342
 343         if ((c = tb[LEASE_ATTR_IP]))
 344                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 345                         goto err;
 346
 347         if ((c = tb[LEASE_ATTR_MAC]))
 348                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 349                         goto err;
 350
 351         if ((c = tb[LEASE_ATTR_DUID])) {
 352                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 353                 lease->duid = malloc(duidlen);
 354                 if (!lease->duid)
 355                         goto err;
 356
 357                 ssize_t len = odhcpd_unhexlify(lease->duid,
 358                                 duidlen, blobmsg_get_string(c));
 359
 360                 if (len < 0)
 361                         goto err;
 362
 363                 lease->duid_len = len;
 364         }
 365
 366         if ((c = tb[LEASE_ATTR_HOSTID])) {
 367                 errno = 0;
 368                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 369                 if (errno)
 370                         goto err;
 371         }
 372
 373         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 374                 double time = parse_leasetime(c);
 375                 if (time < 0)
 376                         goto err;
 377
 378                 lease->dhcpv4_leasetime = time;
 379         }
 380
 381         list_add(&lease->head, &leases);
 382         return 0;
 383
 384 err:
 385         if (lease)
 386                 free_lease(lease);
 387
 388         return -1;
 389 }
 390
 391 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 392 {
 393         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 394         bool get_addrs = false;
 395
 396         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 397
 398         if (tb[IFACE_ATTR_INTERFACE])
 399                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 400
 401         if (!name)
 402                 return -1;
 403
 404         struct interface *iface = get_interface(name);
 405         if (!iface) {
 406                 char *iface_name;
 407
 408                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 409                 if (!iface)
 410                         return -1;
 411
 412                 iface->name = strcpy(iface_name, name);
 413
 414                 set_interface_defaults(iface);
 415
 416                 list_add(&iface->head, &interfaces);
 417                 get_addrs = overwrite = true;
 418         }
 419
 420         const char *ifname = NULL;
 421         if (overwrite) {
 422                 if ((c = tb[IFACE_ATTR_IFNAME]))
 423                         ifname = blobmsg_get_string(c);
 424                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 425                         ifname = blobmsg_get_string(c);
 426         }
 427
 428 #ifdef WITH_UBUS
 429         if (overwrite || !iface->ifname)
 430                 ifname = ubus_get_ifname(name);
 431 #endif
 432
 433         if (!iface->ifname && !ifname)
 434                 goto err;
 435
 436         if (ifname) {
 437                 free(iface->ifname);
 438                 iface->ifname = strdup(ifname);
 439
 440                 if (!iface->ifname)
 441                         goto err;
 442         }
 443
 444         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 445                 goto err;
 446
 447         if (get_addrs) {
 448                 ssize_t len = odhcpd_get_interface_addresses(iface->ifindex,
 449                                                 true, &iface->ia_addr);
 450
 451                 if (len > 0)
 452                         iface->ia_addr_len = len;
 453         }
 454
 455         iface->inuse = true;
 456
 457         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 458                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 459
 460         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 461                 iface->ignore = blobmsg_get_bool(c);
 462
 463         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 464                 double time = parse_leasetime(c);
 465                 if (time < 0)
 466                         goto err;
 467
 468                 iface->dhcpv4_leasetime = time;
 469         }
 470
 471         if ((c = tb[IFACE_ATTR_START])) {
 472                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 473
 474                 if (config.main_dhcpv4 && config.legacy)
 475                         iface->dhcpv4 = RELAYD_SERVER;
 476         }
 477
 478         if ((c = tb[IFACE_ATTR_LIMIT]))
 479                 iface->dhcpv4_end.s_addr = htonl(
 480                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 481
 482         if ((c = tb[IFACE_ATTR_MASTER]))
 483                 iface->master = blobmsg_get_bool(c);
 484
 485         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 486                 struct blob_attr *cur;
 487                 unsigned rem;
 488
 489                 blobmsg_for_each_attr(cur, c, rem) {
 490                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 491                                 continue;
 492
 493                         iface->upstream = realloc(iface->upstream,
 494                                         iface->upstream_len + blobmsg_data_len(cur));
 495                         if (!iface->upstream)
 496                                 goto err;
 497
 498                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 499                         iface->upstream_len += blobmsg_data_len(cur);
 500                 }
 501         }
 502
 503         int mode;
 504         if ((c = tb[IFACE_ATTR_RA])) {
 505                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 506                         iface->ra = mode;
 507                 else
 508                         goto err;
 509         }
 510
 511         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 512                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 513                         if (config.main_dhcpv4)
 514                                 iface->dhcpv4 = mode;
 515                 }
 516                 else
 517                         goto err;
 518         }
 519
 520         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 521                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 522                         iface->dhcpv6 = mode;
 523                 else
 524                         goto err;
 525         }
 526
 527         if ((c = tb[IFACE_ATTR_NDP])) {
 528                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 529                         iface->ndp = mode;
 530                 else
 531                         goto err;
 532         }
 533
 534         if ((c = tb[IFACE_ATTR_ROUTER])) {
 535                 struct blob_attr *cur;
 536                 unsigned rem;
 537
 538                 blobmsg_for_each_attr(cur, c, rem) {
 539                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 540                                 continue;
 541
 542                         struct in_addr addr4;
 543                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 544                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 545                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 546                                 if (!iface->dhcpv4_router)
 547                                         goto err;
 548
 549                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 550                         } else
 551                                 goto err;
 552                 }
 553         }
 554
 555         if ((c = tb[IFACE_ATTR_DNS])) {
 556                 struct blob_attr *cur;
 557                 unsigned rem;
 558
 559                 iface->always_rewrite_dns = true;
 560                 blobmsg_for_each_attr(cur, c, rem) {
 561                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 562                                 continue;
 563
 564                         struct in_addr addr4;
 565                         struct in6_addr addr6;
 566                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 567                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 568                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 569                                 if (!iface->dhcpv4_dns)
 570                                         goto err;
 571
 572                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 573                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 574                                 iface->dns = realloc(iface->dns,
 575                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 576                                 if (!iface->dns)
 577                                         goto err;
 578
 579                                 iface->dns[iface->dns_cnt - 1] = addr6;
 580                         } else
 581                                 goto err;
 582                 }
 583         }
 584
 585         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 586                 struct blob_attr *cur;
 587                 unsigned rem;
 588
 589                 blobmsg_for_each_attr(cur, c, rem) {
 590                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 591                                 continue;
 592
 593                         uint8_t buf[256];
 594                         char *domain = blobmsg_get_string(cur);
 595                         size_t domainlen = strlen(domain);
 596                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 597                                 domain[domainlen - 1] = 0;
 598
 599                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 600                         if (len <= 0)
 601                                 goto err;
 602
 603                         iface->search = realloc(iface->search, iface->search_len + len);
 604                         if (!iface->search)
 605                                 goto err;
 606
 607                         memcpy(&iface->search[iface->search_len], buf, len);
 608                         iface->search_len += len;
 609                 }
 610         }
 611
 612         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 613                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 614                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 615         }
 616
 617         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 618                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 619                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 620                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 621         }
 622
 623         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 624                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 625
 626         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 627                 iface->default_router = blobmsg_get_u32(c);
 628
 629         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 630                 iface->ra_managed = blobmsg_get_u32(c);
 631
 632         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 633                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 634                 if (ra_reachabletime > 3600000)
 635                         goto err;
 636
 637                 iface->ra_reachabletime = ra_reachabletime;
 638         }
 639
 640         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 641                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 642                 if (ra_retranstime > 60000)
 643                         goto err;
 644
 645                 iface->ra_retranstime = ra_retranstime;
 646         }
 647
 648         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 649                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 650                 if (ra_hoplimit > 255)
 651                         goto err;
 652
 653                 iface->ra_hoplimit = ra_hoplimit;
 654         }
 655
 656         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 657                 uint32_t ra_mtu = blobmsg_get_u32(c);
 658                 if (ra_mtu < 1280 || ra_mtu > 65535)
 659                         goto err;
 660
 661                 iface->ra_mtu = ra_mtu;
 662         }
 663
 664         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 665                 iface->ra_not_onlink = blobmsg_get_bool(c);
 666
 667         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 668                 iface->ra_advrouter = blobmsg_get_bool(c);
 669
 670         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 671                 iface->ra_mininterval =  blobmsg_get_u32(c);
 672
 673         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 674                 iface->ra_maxinterval = blobmsg_get_u32(c);
 675
 676         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 677                 iface->ra_lifetime = blobmsg_get_u32(c);
 678
 679         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 680                 iface->ra_useleasetime = blobmsg_get_bool(c);
 681
 682         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 683                 const char *prio = blobmsg_get_string(c);
 684
 685                 if (!strcmp(prio, "high"))
 686                         iface->route_preference = 1;
 687                 else if (!strcmp(prio, "low"))
 688                         iface->route_preference = -1;
 689                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 690                         iface->route_preference = 0;
 691                 else
 692                         goto err;
 693         }
 694
 695         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 696                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 697                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 698
 699         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 700                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 701                 goto err;
 702
 703         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 704                 iface->learn_routes = blobmsg_get_bool(c);
 705
 706         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 707                 iface->external = blobmsg_get_bool(c);
 708
 709         return 0;
 710
 711 err:
 712         close_interface(iface);
 713         return -1;
 714 }
 715
 716 static int set_interface(struct uci_section *s)
 717 {
 718         blob_buf_init(&b, 0);
 719         uci_to_blob(&b, s, &interface_attr_list);
 720
 721         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 722 }
 723
 724 void odhcpd_reload(void)
 725 {
 726         struct uci_context *uci = uci_alloc_context();
 727
 728         while (!list_empty(&leases))
 729                 free_lease(list_first_entry(&leases, struct lease, head));
 730
 731         struct interface *master = NULL, *i, *n;
 732
 733         if (!uci)
 734                 return;
 735
 736         list_for_each_entry(i, &interfaces, head)
 737                 clean_interface(i);
 738
 739         struct uci_package *dhcp = NULL;
 740         if (!uci_load(uci, "dhcp", &dhcp)) {
 741                 struct uci_element *e;
 742                 uci_foreach_element(&dhcp->sections, e) {
 743                         struct uci_section *s = uci_to_section(e);
 744                         if (!strcmp(s->type, "host"))
 745                                 set_lease(s);
 746                         else if (!strcmp(s->type, "odhcpd"))
 747                                 set_config(s);
 748                 }
 749
 750                 uci_foreach_element(&dhcp->sections, e) {
 751                         struct uci_section *s = uci_to_section(e);
 752                         if (!strcmp(s->type, "dhcp"))
 753                                 set_interface(s);
 754                 }
 755         }
 756
 757         if (config.dhcp_statefile) {
 758                 char *path = strdup(config.dhcp_statefile);
 759
 760                 mkdir_p(dirname(path), 0755);
 761                 free(path);
 762         }
 763
 764 #ifdef WITH_UBUS
 765         ubus_apply_network();
 766 #endif
 767
 768         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 769
 770         /* Test for */
 771         list_for_each_entry(i, &interfaces, head) {
 772                 if (i->master)
 773                         continue;
 774
 775                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 776                         any_dhcpv6_slave = true;
 777
 778                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 779                         any_ra_slave = true;
 780
 781                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 782                         any_ndp_slave = true;
 783         }
 784
 785         /* Evaluate hybrid mode for master */
 786         list_for_each_entry(i, &interfaces, head) {
 787                 if (!i->master)
 788                         continue;
 789
 790                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 791 #ifdef WITH_UBUS
 792                 if (!ubus_has_prefix(i->name, i->ifname))
 793                         hybrid_mode = RELAYD_RELAY;
 794 #endif
 795
 796                 if (i->dhcpv6 == RELAYD_HYBRID)
 797                         i->dhcpv6 = hybrid_mode;
 798
 799                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 800                         i->dhcpv6 = RELAYD_DISABLED;
 801
 802                 if (i->ra == RELAYD_HYBRID)
 803                         i->ra = hybrid_mode;
 804
 805                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 806                         i->ra = RELAYD_DISABLED;
 807
 808                 if (i->ndp == RELAYD_HYBRID)
 809                         i->ndp = hybrid_mode;
 810
 811                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 812                         i->ndp = RELAYD_DISABLED;
 813
 814                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 815                         master = i;
 816         }
 817
 818
 819         list_for_each_entry_safe(i, n, &interfaces, head) {
 820                 if (i->inuse) {
 821                         /* Resolve hybrid mode */
 822                         if (i->dhcpv6 == RELAYD_HYBRID)
 823                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 824                                                 RELAYD_RELAY : RELAYD_SERVER;
 825
 826                         if (i->ra == RELAYD_HYBRID)
 827                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 828                                                 RELAYD_RELAY : RELAYD_SERVER;
 829
 830                         if (i->ndp == RELAYD_HYBRID)
 831                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 832                                                 RELAYD_RELAY : RELAYD_DISABLED;
 833
 834                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 835                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 836                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 837                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 838                 } else
 839                         close_interface(i);
 840         }
 841
 842         uci_unload(uci, dhcp);
 843         uci_free_context(uci);
 844 }
 845
 846 static void handle_signal(int signal)
 847 {
 848         char b[1] = {0};
 849
 850         if (signal == SIGHUP) {
 851                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 852         } else
 853                 uloop_end();
 854 }
 855
 856 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 857 {
 858         char b[512];
 859         if (read(u->fd, b, sizeof(b)) < 0) {}
 860
 861         odhcpd_reload();
 862 }
 863
 864 static struct uloop_fd reload_fd = { .cb = reload_cb };
 865
 866 void odhcpd_run(void)
 867 {
 868         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 869
 870         reload_fd.fd = reload_pipe[0];
 871         uloop_fd_add(&reload_fd, ULOOP_READ);
 872
 873         signal(SIGTERM, handle_signal);
 874         signal(SIGINT, handle_signal);
 875         signal(SIGHUP, handle_signal);
 876
 877 #ifdef WITH_UBUS
 878         while (init_ubus())
 879                 sleep(1);
 880 #endif
 881
 882         odhcpd_reload();
 883         uloop_run();
 884
 885         while (!list_empty(&interfaces))
 886                 close_interface(list_first_entry(&interfaces, struct interface, head));
 887 }
 888