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->addr4);
 244         free(iface->ia_addr);
 245         free(iface->ifname);
 246         free(iface);
 247 }
 248
 249 static int parse_mode(const char *mode)
 250 {
 251         if (!strcmp(mode, "disabled"))
 252                 return MODE_DISABLED;
 253         else if (!strcmp(mode, "server"))
 254                 return MODE_SERVER;
 255         else if (!strcmp(mode, "relay"))
 256                 return MODE_RELAY;
 257         else if (!strcmp(mode, "hybrid"))
 258                 return MODE_HYBRID;
 259         else
 260                 return -1;
 261 }
 262
 263 static void set_config(struct uci_section *s)
 264 {
 265         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 266
 267         blob_buf_init(&b, 0);
 268         uci_to_blob(&b, s, &odhcpd_attr_list);
 269         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 270
 271         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 272                 config.legacy = blobmsg_get_bool(c);
 273
 274         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 275                 config.main_dhcpv4 = blobmsg_get_bool(c);
 276
 277         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 278                 free(config.dhcp_statefile);
 279                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 280         }
 281
 282         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 283                 free(config.dhcp_cb);
 284                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 285         }
 286
 287         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 288                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 289
 290                 if (config.log_level != log_level) {
 291                         config.log_level = log_level;
 292                         setlogmask(LOG_UPTO(config.log_level));
 293                 }
 294         }
 295 }
 296
 297 static double parse_leasetime(struct blob_attr *c) {
 298         char *val = blobmsg_get_string(c), *endptr = NULL;
 299         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 300
 301         if (time && endptr && endptr[0]) {
 302                 if (endptr[0] == 's')
 303                         time *= 1;
 304                 else if (endptr[0] == 'm')
 305                         time *= 60;
 306                 else if (endptr[0] == 'h')
 307                         time *= 3600;
 308                 else if (endptr[0] == 'd')
 309                         time *= 24 * 3600;
 310                 else if (endptr[0] == 'w')
 311                         time *= 7 * 24 * 3600;
 312                 else
 313                         goto err;
 314         }
 315
 316         if (time < 60)
 317                 time = 60;
 318
 319         return time;
 320
 321 err:
 322         return -1;
 323 }
 324
 325 static int set_lease(struct uci_section *s)
 326 {
 327         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 328
 329         blob_buf_init(&b, 0);
 330         uci_to_blob(&b, s, &lease_attr_list);
 331         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 332
 333         size_t hostlen = 1;
 334         if ((c = tb[LEASE_ATTR_NAME]))
 335                 hostlen = blobmsg_data_len(c);
 336
 337         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 338         if (!lease)
 339                 goto err;
 340
 341         if (hostlen > 1)
 342                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 343
 344         if ((c = tb[LEASE_ATTR_IP]))
 345                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 346                         goto err;
 347
 348         if ((c = tb[LEASE_ATTR_MAC]))
 349                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 350                         goto err;
 351
 352         if ((c = tb[LEASE_ATTR_DUID])) {
 353                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 354                 lease->duid = malloc(duidlen);
 355                 if (!lease->duid)
 356                         goto err;
 357
 358                 ssize_t len = odhcpd_unhexlify(lease->duid,
 359                                 duidlen, blobmsg_get_string(c));
 360
 361                 if (len < 0)
 362                         goto err;
 363
 364                 lease->duid_len = len;
 365         }
 366
 367         if ((c = tb[LEASE_ATTR_HOSTID])) {
 368                 errno = 0;
 369                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 370                 if (errno)
 371                         goto err;
 372         }
 373
 374         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 375                 double time = parse_leasetime(c);
 376                 if (time < 0)
 377                         goto err;
 378
 379                 lease->dhcpv4_leasetime = time;
 380         }
 381
 382         list_add(&lease->head, &leases);
 383         return 0;
 384
 385 err:
 386         if (lease)
 387                 free_lease(lease);
 388
 389         return -1;
 390 }
 391
 392 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 393 {
 394         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 395         bool get_addrs = false;
 396
 397         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 398
 399         if (tb[IFACE_ATTR_INTERFACE])
 400                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 401
 402         if (!name)
 403                 return -1;
 404
 405         struct interface *iface = get_interface(name);
 406         if (!iface) {
 407                 char *iface_name;
 408
 409                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 410                 if (!iface)
 411                         return -1;
 412
 413                 iface->name = strcpy(iface_name, name);
 414
 415                 set_interface_defaults(iface);
 416
 417                 list_add(&iface->head, &interfaces);
 418                 get_addrs = overwrite = true;
 419         }
 420
 421         const char *ifname = NULL;
 422         if (overwrite) {
 423                 if ((c = tb[IFACE_ATTR_IFNAME]))
 424                         ifname = blobmsg_get_string(c);
 425                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 426                         ifname = blobmsg_get_string(c);
 427         }
 428
 429 #ifdef WITH_UBUS
 430         if (overwrite || !iface->ifname)
 431                 ifname = ubus_get_ifname(name);
 432 #endif
 433
 434         if (!iface->ifname && !ifname)
 435                 goto err;
 436
 437         if (ifname) {
 438                 free(iface->ifname);
 439                 iface->ifname = strdup(ifname);
 440
 441                 if (!iface->ifname)
 442                         goto err;
 443
 444                 if (!iface->ifindex &&
 445                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 446                         goto err;
 447         }
 448
 449         if (get_addrs) {
 450                 ssize_t len = odhcpd_get_interface_addresses(iface->ifindex,
 451                                                 true, &iface->ia_addr);
 452
 453                 if (len > 0)
 454                         iface->ia_addr_len = len;
 455
 456                 len = odhcpd_get_interface_addresses(iface->ifindex,
 457                                                 false, &iface->addr4);
 458                 if (len > 0)
 459                         iface->addr4_len = len;
 460         }
 461
 462         iface->inuse = true;
 463
 464         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 465                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 466
 467         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 468                 iface->ignore = blobmsg_get_bool(c);
 469
 470         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 471                 double time = parse_leasetime(c);
 472                 if (time < 0)
 473                         goto err;
 474
 475                 iface->dhcpv4_leasetime = time;
 476         }
 477
 478         if ((c = tb[IFACE_ATTR_START])) {
 479                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 480
 481                 if (config.main_dhcpv4 && config.legacy)
 482                         iface->dhcpv4 = MODE_SERVER;
 483         }
 484
 485         if ((c = tb[IFACE_ATTR_LIMIT]))
 486                 iface->dhcpv4_end.s_addr = htonl(
 487                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 488
 489         if ((c = tb[IFACE_ATTR_MASTER]))
 490                 iface->master = blobmsg_get_bool(c);
 491
 492         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 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                         iface->upstream = realloc(iface->upstream,
 501                                         iface->upstream_len + blobmsg_data_len(cur));
 502                         if (!iface->upstream)
 503                                 goto err;
 504
 505                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 506                         iface->upstream_len += blobmsg_data_len(cur);
 507                 }
 508         }
 509
 510         int mode;
 511         if ((c = tb[IFACE_ATTR_RA])) {
 512                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 513                         iface->ra = mode;
 514                 else
 515                         goto err;
 516         }
 517
 518         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 519                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 520                         if (config.main_dhcpv4)
 521                                 iface->dhcpv4 = mode;
 522                 }
 523                 else
 524                         goto err;
 525         }
 526
 527         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 528                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 529                         iface->dhcpv6 = mode;
 530                 else
 531                         goto err;
 532         }
 533
 534         if ((c = tb[IFACE_ATTR_NDP])) {
 535                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 536                         iface->ndp = mode;
 537                 else
 538                         goto err;
 539         }
 540
 541         if ((c = tb[IFACE_ATTR_ROUTER])) {
 542                 struct blob_attr *cur;
 543                 unsigned rem;
 544
 545                 blobmsg_for_each_attr(cur, c, rem) {
 546                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 547                                 continue;
 548
 549                         struct in_addr addr4;
 550                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 551                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 552                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 553                                 if (!iface->dhcpv4_router)
 554                                         goto err;
 555
 556                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 557                         } else
 558                                 goto err;
 559                 }
 560         }
 561
 562         if ((c = tb[IFACE_ATTR_DNS])) {
 563                 struct blob_attr *cur;
 564                 unsigned rem;
 565
 566                 iface->always_rewrite_dns = true;
 567                 blobmsg_for_each_attr(cur, c, rem) {
 568                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 569                                 continue;
 570
 571                         struct in_addr addr4;
 572                         struct in6_addr addr6;
 573                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 574                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 575                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 576                                 if (!iface->dhcpv4_dns)
 577                                         goto err;
 578
 579                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 580                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 581                                 iface->dns = realloc(iface->dns,
 582                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 583                                 if (!iface->dns)
 584                                         goto err;
 585
 586                                 iface->dns[iface->dns_cnt - 1] = addr6;
 587                         } else
 588                                 goto err;
 589                 }
 590         }
 591
 592         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 593                 struct blob_attr *cur;
 594                 unsigned rem;
 595
 596                 blobmsg_for_each_attr(cur, c, rem) {
 597                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 598                                 continue;
 599
 600                         uint8_t buf[256];
 601                         char *domain = blobmsg_get_string(cur);
 602                         size_t domainlen = strlen(domain);
 603                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 604                                 domain[domainlen - 1] = 0;
 605
 606                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 607                         if (len <= 0)
 608                                 goto err;
 609
 610                         iface->search = realloc(iface->search, iface->search_len + len);
 611                         if (!iface->search)
 612                                 goto err;
 613
 614                         memcpy(&iface->search[iface->search_len], buf, len);
 615                         iface->search_len += len;
 616                 }
 617         }
 618
 619         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 620                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 621                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 622         }
 623
 624         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 625                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 626                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 627                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 628         }
 629
 630         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 631                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 632
 633         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 634                 iface->default_router = blobmsg_get_u32(c);
 635
 636         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 637                 iface->ra_managed = blobmsg_get_u32(c);
 638
 639         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 640                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 641                 if (ra_reachabletime > 3600000)
 642                         goto err;
 643
 644                 iface->ra_reachabletime = ra_reachabletime;
 645         }
 646
 647         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 648                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 649                 if (ra_retranstime > 60000)
 650                         goto err;
 651
 652                 iface->ra_retranstime = ra_retranstime;
 653         }
 654
 655         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 656                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 657                 if (ra_hoplimit > 255)
 658                         goto err;
 659
 660                 iface->ra_hoplimit = ra_hoplimit;
 661         }
 662
 663         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 664                 uint32_t ra_mtu = blobmsg_get_u32(c);
 665                 if (ra_mtu < 1280 || ra_mtu > 65535)
 666                         goto err;
 667
 668                 iface->ra_mtu = ra_mtu;
 669         }
 670
 671         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 672                 iface->ra_not_onlink = blobmsg_get_bool(c);
 673
 674         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 675                 iface->ra_advrouter = blobmsg_get_bool(c);
 676
 677         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 678                 iface->ra_mininterval =  blobmsg_get_u32(c);
 679
 680         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 681                 iface->ra_maxinterval = blobmsg_get_u32(c);
 682
 683         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 684                 iface->ra_lifetime = blobmsg_get_u32(c);
 685
 686         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 687                 iface->ra_useleasetime = blobmsg_get_bool(c);
 688
 689         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 690                 const char *prio = blobmsg_get_string(c);
 691
 692                 if (!strcmp(prio, "high"))
 693                         iface->route_preference = 1;
 694                 else if (!strcmp(prio, "low"))
 695                         iface->route_preference = -1;
 696                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 697                         iface->route_preference = 0;
 698                 else
 699                         goto err;
 700         }
 701
 702         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 703                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 704                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 705
 706         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 707                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 708                 goto err;
 709
 710         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 711                 iface->learn_routes = blobmsg_get_bool(c);
 712
 713         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 714                 iface->external = blobmsg_get_bool(c);
 715
 716         return 0;
 717
 718 err:
 719         close_interface(iface);
 720         return -1;
 721 }
 722
 723 static int set_interface(struct uci_section *s)
 724 {
 725         blob_buf_init(&b, 0);
 726         uci_to_blob(&b, s, &interface_attr_list);
 727
 728         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 729 }
 730
 731 void odhcpd_reload(void)
 732 {
 733         struct uci_context *uci = uci_alloc_context();
 734
 735         while (!list_empty(&leases))
 736                 free_lease(list_first_entry(&leases, struct lease, head));
 737
 738         struct interface *master = NULL, *i, *n;
 739
 740         if (!uci)
 741                 return;
 742
 743         list_for_each_entry(i, &interfaces, head)
 744                 clean_interface(i);
 745
 746         struct uci_package *dhcp = NULL;
 747         if (!uci_load(uci, "dhcp", &dhcp)) {
 748                 struct uci_element *e;
 749                 uci_foreach_element(&dhcp->sections, e) {
 750                         struct uci_section *s = uci_to_section(e);
 751                         if (!strcmp(s->type, "host"))
 752                                 set_lease(s);
 753                         else if (!strcmp(s->type, "odhcpd"))
 754                                 set_config(s);
 755                 }
 756
 757                 uci_foreach_element(&dhcp->sections, e) {
 758                         struct uci_section *s = uci_to_section(e);
 759                         if (!strcmp(s->type, "dhcp"))
 760                                 set_interface(s);
 761                 }
 762         }
 763
 764         if (config.dhcp_statefile) {
 765                 char *path = strdup(config.dhcp_statefile);
 766
 767                 mkdir_p(dirname(path), 0755);
 768                 free(path);
 769         }
 770
 771 #ifdef WITH_UBUS
 772         ubus_apply_network();
 773 #endif
 774
 775         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 776
 777         /* Test for */
 778         list_for_each_entry(i, &interfaces, head) {
 779                 if (i->master)
 780                         continue;
 781
 782                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 783                         any_dhcpv6_slave = true;
 784
 785                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 786                         any_ra_slave = true;
 787
 788                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 789                         any_ndp_slave = true;
 790         }
 791
 792         /* Evaluate hybrid mode for master */
 793         list_for_each_entry(i, &interfaces, head) {
 794                 if (!i->master)
 795                         continue;
 796
 797                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 798 #ifdef WITH_UBUS
 799                 if (!ubus_has_prefix(i->name, i->ifname))
 800                         hybrid_mode = MODE_RELAY;
 801 #endif
 802
 803                 if (i->dhcpv6 == MODE_HYBRID)
 804                         i->dhcpv6 = hybrid_mode;
 805
 806                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 807                         i->dhcpv6 = MODE_DISABLED;
 808
 809                 if (i->ra == MODE_HYBRID)
 810                         i->ra = hybrid_mode;
 811
 812                 if (i->ra == MODE_RELAY && !any_ra_slave)
 813                         i->ra = MODE_DISABLED;
 814
 815                 if (i->ndp == MODE_HYBRID)
 816                         i->ndp = hybrid_mode;
 817
 818                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 819                         i->ndp = MODE_DISABLED;
 820
 821                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 822                         master = i;
 823         }
 824
 825
 826         list_for_each_entry_safe(i, n, &interfaces, head) {
 827                 if (i->inuse) {
 828                         /* Resolve hybrid mode */
 829                         if (i->dhcpv6 == MODE_HYBRID)
 830                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 831                                                 MODE_RELAY : MODE_SERVER;
 832
 833                         if (i->ra == MODE_HYBRID)
 834                                 i->ra = (master && master->ra == MODE_RELAY) ?
 835                                                 MODE_RELAY : MODE_SERVER;
 836
 837                         if (i->ndp == MODE_HYBRID)
 838                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 839                                                 MODE_RELAY : MODE_DISABLED;
 840
 841                         setup_router_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 842                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 843                         setup_ndp_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 844                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 845                 } else
 846                         close_interface(i);
 847         }
 848
 849         uci_unload(uci, dhcp);
 850         uci_free_context(uci);
 851 }
 852
 853 static void handle_signal(int signal)
 854 {
 855         char b[1] = {0};
 856
 857         if (signal == SIGHUP) {
 858                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 859         } else
 860                 uloop_end();
 861 }
 862
 863 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 864 {
 865         char b[512];
 866         if (read(u->fd, b, sizeof(b)) < 0) {}
 867
 868         odhcpd_reload();
 869 }
 870
 871 static struct uloop_fd reload_fd = { .cb = reload_cb };
 872
 873 void odhcpd_run(void)
 874 {
 875         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 876
 877         reload_fd.fd = reload_pipe[0];
 878         uloop_fd_add(&reload_fd, ULOOP_READ);
 879
 880         signal(SIGTERM, handle_signal);
 881         signal(SIGINT, handle_signal);
 882         signal(SIGHUP, handle_signal);
 883
 884 #ifdef WITH_UBUS
 885         while (init_ubus())
 886                 sleep(1);
 887 #endif
 888
 889         odhcpd_reload();
 890         uloop_run();
 891
 892         while (!list_empty(&interfaces))
 893                 close_interface(list_first_entry(&interfaces, struct interface, head));
 894 }
 895