src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <string.h>
   8 #include <sys/stat.h>
   9 #include <syslog.h>
  10
  11 #include <uci.h>
  12 #include <uci_blob.h>
  13
  14 #include "odhcpd.h"
  15
  16 static struct blob_buf b;
  17 static int reload_pipe[2];
  18 struct list_head leases = LIST_HEAD_INIT(leases);
  19 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  20 struct config config = {.legacy = false, .main_dhcpv4 = false,
  21                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  22                         .log_level = LOG_INFO};
  23
  24 enum {
  25         IFACE_ATTR_INTERFACE,
  26         IFACE_ATTR_IFNAME,
  27         IFACE_ATTR_NETWORKID,
  28         IFACE_ATTR_DYNAMICDHCP,
  29         IFACE_ATTR_IGNORE,
  30         IFACE_ATTR_LEASETIME,
  31         IFACE_ATTR_LIMIT,
  32         IFACE_ATTR_START,
  33         IFACE_ATTR_MASTER,
  34         IFACE_ATTR_UPSTREAM,
  35         IFACE_ATTR_RA,
  36         IFACE_ATTR_DHCPV4,
  37         IFACE_ATTR_DHCPV6,
  38         IFACE_ATTR_NDP,
  39         IFACE_ATTR_ROUTER,
  40         IFACE_ATTR_DNS,
  41         IFACE_ATTR_DOMAIN,
  42         IFACE_ATTR_FILTER_CLASS,
  43         IFACE_ATTR_DHCPV6_RAW,
  44         IFACE_ATTR_RA_DEFAULT,
  45         IFACE_ATTR_RA_MANAGEMENT,
  46         IFACE_ATTR_RA_OFFLINK,
  47         IFACE_ATTR_RA_PREFERENCE,
  48         IFACE_ATTR_RA_ADVROUTER,
  49         IFACE_ATTR_RA_MININTERVAL,
  50         IFACE_ATTR_RA_MAXINTERVAL,
  51         IFACE_ATTR_RA_LIFETIME,
  52         IFACE_ATTR_RA_USELEASETIME,
  53         IFACE_ATTR_PD_MANAGER,
  54         IFACE_ATTR_PD_CER,
  55         IFACE_ATTR_NDPROXY_ROUTING,
  56         IFACE_ATTR_NDPROXY_SLAVE,
  57         IFACE_ATTR_MAX
  58 };
  59
  60 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  61         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  65         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  68         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  71         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  76         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  83         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  84         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  85         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  87         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  88         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  89         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  92         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  93 };
  94
  95 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  96         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
  99 };
 100
 101 const struct uci_blob_param_list interface_attr_list = {
 102         .n_params = IFACE_ATTR_MAX,
 103         .params = iface_attrs,
 104         .info = iface_attr_info,
 105 };
 106
 107 enum {
 108         LEASE_ATTR_IP,
 109         LEASE_ATTR_MAC,
 110         LEASE_ATTR_DUID,
 111         LEASE_ATTR_HOSTID,
 112         LEASE_ATTR_LEASETIME,
 113         LEASE_ATTR_NAME,
 114         LEASE_ATTR_MAX
 115 };
 116
 117 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 118         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 119         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 120         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 121         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 122         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 123         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 124 };
 125
 126 const struct uci_blob_param_list lease_attr_list = {
 127         .n_params = LEASE_ATTR_MAX,
 128         .params = lease_attrs,
 129 };
 130
 131 enum {
 132         ODHCPD_ATTR_LEGACY,
 133         ODHCPD_ATTR_MAINDHCP,
 134         ODHCPD_ATTR_LEASEFILE,
 135         ODHCPD_ATTR_LEASETRIGGER,
 136         ODHCPD_ATTR_LOGLEVEL,
 137         ODHCPD_ATTR_MAX
 138 };
 139
 140 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 141         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 142         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 143         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 144         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 145         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 146 };
 147
 148 const struct uci_blob_param_list odhcpd_attr_list = {
 149         .n_params = ODHCPD_ATTR_MAX,
 150         .params = odhcpd_attrs,
 151 };
 152
 153 static int mkdir_p(char *dir, mode_t mask)
 154 {
 155         char *l = strrchr(dir, '/');
 156         int ret;
 157
 158         if (!l)
 159                 return 0;
 160
 161         *l = '\0';
 162
 163         if (mkdir_p(dir, mask))
 164                 return -1;
 165
 166         *l = '/';
 167
 168         ret = mkdir(dir, mask);
 169         if (ret && errno == EEXIST)
 170                 return 0;
 171
 172         if (ret)
 173                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 174
 175         return ret;
 176 }
 177
 178 static void free_lease(struct lease *l)
 179 {
 180         if (l->head.next)
 181                 list_del(&l->head);
 182
 183         free(l->duid);
 184         free(l);
 185 }
 186
 187 static struct interface* get_interface(const char *name)
 188 {
 189         struct interface *c;
 190         list_for_each_entry(c, &interfaces, head)
 191                 if (!strcmp(c->name, name))
 192                         return c;
 193         return NULL;
 194 }
 195
 196 static void set_interface_defaults(struct interface *iface)
 197 {
 198         iface->managed = 1;
 199         iface->learn_routes = 1;
 200         iface->dhcpv4_leasetime = 43200;
 201         iface->ra_maxinterval = 600;
 202         iface->ra_mininterval = iface->ra_maxinterval/3;
 203         iface->ra_lifetime = -1;
 204 }
 205
 206 static void clean_interface(struct interface *iface)
 207 {
 208         free(iface->dns);
 209         free(iface->search);
 210         free(iface->upstream);
 211         free(iface->dhcpv4_router);
 212         free(iface->dhcpv4_dns);
 213         free(iface->dhcpv6_raw);
 214         free(iface->filter_class);
 215         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 216         set_interface_defaults(iface);
 217 }
 218
 219 static void close_interface(struct interface *iface)
 220 {
 221         if (iface->head.next)
 222                 list_del(&iface->head);
 223
 224         setup_router_interface(iface, false);
 225         setup_dhcpv6_interface(iface, false);
 226         setup_ndp_interface(iface, false);
 227         setup_dhcpv4_interface(iface, false);
 228
 229         clean_interface(iface);
 230         free(iface);
 231 }
 232
 233 static int parse_mode(const char *mode)
 234 {
 235         if (!strcmp(mode, "disabled"))
 236                 return RELAYD_DISABLED;
 237         else if (!strcmp(mode, "server"))
 238                 return RELAYD_SERVER;
 239         else if (!strcmp(mode, "relay"))
 240                 return RELAYD_RELAY;
 241         else if (!strcmp(mode, "hybrid"))
 242                 return RELAYD_HYBRID;
 243         else
 244                 return -1;
 245 }
 246
 247 static void set_config(struct uci_section *s)
 248 {
 249         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 250
 251         blob_buf_init(&b, 0);
 252         uci_to_blob(&b, s, &odhcpd_attr_list);
 253         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 254
 255         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 256                 config.legacy = blobmsg_get_bool(c);
 257
 258         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 259                 config.main_dhcpv4 = blobmsg_get_bool(c);
 260
 261         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 262                 free(config.dhcp_statefile);
 263                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 264         }
 265
 266         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 267                 free(config.dhcp_cb);
 268                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 269         }
 270
 271         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 272                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 273
 274                 if (config.log_level != log_level) {
 275                         config.log_level = log_level;
 276                         setlogmask(LOG_UPTO(config.log_level));
 277                 }
 278         }
 279 }
 280
 281 static double parse_leasetime(struct blob_attr *c) {
 282         char *val = blobmsg_get_string(c), *endptr = NULL;
 283         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 284
 285         if (time && endptr && endptr[0]) {
 286                 if (endptr[0] == 's')
 287                         time *= 1;
 288                 else if (endptr[0] == 'm')
 289                         time *= 60;
 290                 else if (endptr[0] == 'h')
 291                         time *= 3600;
 292                 else if (endptr[0] == 'd')
 293                         time *= 24 * 3600;
 294                 else if (endptr[0] == 'w')
 295                         time *= 7 * 24 * 3600;
 296                 else
 297                         goto err;
 298         }
 299
 300         if (time < 60)
 301                 time = 60;
 302
 303         return time;
 304
 305 err:
 306         return -1;
 307 }
 308
 309 static int set_lease(struct uci_section *s)
 310 {
 311         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 312
 313         blob_buf_init(&b, 0);
 314         uci_to_blob(&b, s, &lease_attr_list);
 315         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 316
 317         size_t hostlen = 1;
 318         if ((c = tb[LEASE_ATTR_NAME]))
 319                 hostlen = blobmsg_data_len(c);
 320
 321         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 322         if (!lease)
 323                 goto err;
 324
 325         if (hostlen > 1)
 326                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 327
 328         if ((c = tb[LEASE_ATTR_IP]))
 329                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 330                         goto err;
 331
 332         if ((c = tb[LEASE_ATTR_MAC]))
 333                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 334                         goto err;
 335
 336         if ((c = tb[LEASE_ATTR_DUID])) {
 337                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 338                 lease->duid = malloc(duidlen);
 339                 if (!lease->duid)
 340                         goto err;
 341
 342                 ssize_t len = odhcpd_unhexlify(lease->duid,
 343                                 duidlen, blobmsg_get_string(c));
 344
 345                 if (len < 0)
 346                         goto err;
 347
 348                 lease->duid_len = len;
 349         }
 350
 351         if ((c = tb[LEASE_ATTR_HOSTID])) {
 352                 errno = 0;
 353                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 354                 if (errno)
 355                         goto err;
 356         }
 357
 358         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 359                 double time = parse_leasetime(c);
 360                 if (time < 0)
 361                         goto err;
 362
 363                 lease->dhcpv4_leasetime = time;
 364         }
 365
 366         list_add(&lease->head, &leases);
 367         return 0;
 368
 369 err:
 370         if (lease)
 371                 free_lease(lease);
 372
 373         return -1;
 374 }
 375
 376 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 377 {
 378         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 379         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 380
 381         if (tb[IFACE_ATTR_INTERFACE])
 382                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 383
 384         if (!name)
 385                 return -1;
 386
 387         struct interface *iface = get_interface(name);
 388         if (!iface) {
 389                 iface = calloc(1, sizeof(*iface));
 390                 if (!iface)
 391                         return -1;
 392
 393                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 394
 395                 set_interface_defaults(iface);
 396
 397                 list_add(&iface->head, &interfaces);
 398                 overwrite = true;
 399         }
 400
 401         const char *ifname = NULL;
 402         if (overwrite) {
 403                 if ((c = tb[IFACE_ATTR_IFNAME]))
 404                         ifname = blobmsg_get_string(c);
 405                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 406                         ifname = blobmsg_get_string(c);
 407         }
 408
 409 #ifdef WITH_UBUS
 410         if (overwrite || !iface->ifname[0])
 411                 ifname = ubus_get_ifname(name);
 412 #endif
 413
 414         if (!iface->ifname[0] && !ifname)
 415                 goto err;
 416
 417         if (ifname)
 418                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 419
 420         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 421                 goto err;
 422
 423         iface->inuse = true;
 424
 425         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 426                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 427
 428         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 429                 iface->ignore = blobmsg_get_bool(c);
 430
 431         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 432                 double time = parse_leasetime(c);
 433                 if (time < 0)
 434                         goto err;
 435
 436                 iface->dhcpv4_leasetime = time;
 437         }
 438
 439         if ((c = tb[IFACE_ATTR_START])) {
 440                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 441
 442                 if (config.main_dhcpv4 && config.legacy)
 443                         iface->dhcpv4 = RELAYD_SERVER;
 444         }
 445
 446         if ((c = tb[IFACE_ATTR_LIMIT]))
 447                 iface->dhcpv4_end.s_addr = htonl(
 448                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 449
 450         if ((c = tb[IFACE_ATTR_MASTER]))
 451                 iface->master = blobmsg_get_bool(c);
 452
 453         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 454                 struct blob_attr *cur;
 455                 unsigned rem;
 456
 457                 blobmsg_for_each_attr(cur, c, rem) {
 458                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 459                                 continue;
 460
 461                         iface->upstream = realloc(iface->upstream,
 462                                         iface->upstream_len + blobmsg_data_len(cur));
 463                         if (!iface->upstream)
 464                                 goto err;
 465
 466                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 467                         iface->upstream_len += blobmsg_data_len(cur);
 468                 }
 469         }
 470
 471         int mode;
 472         if ((c = tb[IFACE_ATTR_RA])) {
 473                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 474                         iface->ra = mode;
 475                 else
 476                         goto err;
 477         }
 478
 479         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 480                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 481                         if (config.main_dhcpv4)
 482                                 iface->dhcpv4 = mode;
 483                 }
 484                 else
 485                         goto err;
 486         }
 487
 488         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 489                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 490                         iface->dhcpv6 = mode;
 491                 else
 492                         goto err;
 493         }
 494
 495         if ((c = tb[IFACE_ATTR_NDP])) {
 496                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 497                         iface->ndp = mode;
 498                 else
 499                         goto err;
 500         }
 501
 502         if ((c = tb[IFACE_ATTR_ROUTER])) {
 503                 struct blob_attr *cur;
 504                 unsigned rem;
 505
 506                 blobmsg_for_each_attr(cur, c, rem) {
 507                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 508                                 continue;
 509
 510                         struct in_addr addr4;
 511                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 512                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 513                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 514                                 if (!iface->dhcpv4_router)
 515                                         goto err;
 516
 517                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 518                         } else
 519                                 goto err;
 520                 }
 521         }
 522
 523         if ((c = tb[IFACE_ATTR_DNS])) {
 524                 struct blob_attr *cur;
 525                 unsigned rem;
 526
 527                 iface->always_rewrite_dns = true;
 528                 blobmsg_for_each_attr(cur, c, rem) {
 529                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 530                                 continue;
 531
 532                         struct in_addr addr4;
 533                         struct in6_addr addr6;
 534                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 535                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 536                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 537                                 if (!iface->dhcpv4_dns)
 538                                         goto err;
 539
 540                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 541                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 542                                 iface->dns = realloc(iface->dns,
 543                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 544                                 if (!iface->dns)
 545                                         goto err;
 546
 547                                 iface->dns[iface->dns_cnt - 1] = addr6;
 548                         } else
 549                                 goto err;
 550                 }
 551         }
 552
 553         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 554                 struct blob_attr *cur;
 555                 unsigned rem;
 556
 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                         uint8_t buf[256];
 562                         char *domain = blobmsg_get_string(cur);
 563                         size_t domainlen = strlen(domain);
 564                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 565                                 domain[domainlen - 1] = 0;
 566
 567                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 568                         if (len <= 0)
 569                                 goto err;
 570
 571                         iface->search = realloc(iface->search, iface->search_len + len);
 572                         if (!iface->search)
 573                                 goto err;
 574
 575                         memcpy(&iface->search[iface->search_len], buf, len);
 576                         iface->search_len += len;
 577                 }
 578         }
 579
 580         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 581                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 582                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 583         }
 584
 585         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 586                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 587                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 588                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 589         }
 590
 591         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 592                 iface->default_router = blobmsg_get_u32(c);
 593
 594         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 595                 iface->managed = blobmsg_get_u32(c);
 596
 597         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 598                 iface->ra_not_onlink = blobmsg_get_bool(c);
 599
 600         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 601                 iface->ra_advrouter = blobmsg_get_bool(c);
 602
 603         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 604                 iface->ra_mininterval =  blobmsg_get_u32(c);
 605
 606         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 607                 iface->ra_maxinterval = blobmsg_get_u32(c);
 608
 609         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 610                 iface->ra_lifetime = blobmsg_get_u32(c);
 611
 612         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 613                 iface->ra_useleasetime = blobmsg_get_bool(c);
 614
 615         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 616                 const char *prio = blobmsg_get_string(c);
 617
 618                 if (!strcmp(prio, "high"))
 619                         iface->route_preference = 1;
 620                 else if (!strcmp(prio, "low"))
 621                         iface->route_preference = -1;
 622                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 623                         iface->route_preference = 0;
 624                 else
 625                         goto err;
 626         }
 627
 628         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 629                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 630                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 631
 632         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 633                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 634                 goto err;
 635
 636         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 637                 iface->learn_routes = blobmsg_get_bool(c);
 638
 639         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 640                 iface->external = blobmsg_get_bool(c);
 641
 642         return 0;
 643
 644 err:
 645         close_interface(iface);
 646         return -1;
 647 }
 648
 649 static int set_interface(struct uci_section *s)
 650 {
 651         blob_buf_init(&b, 0);
 652         uci_to_blob(&b, s, &interface_attr_list);
 653
 654         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 655 }
 656
 657 void odhcpd_reload(void)
 658 {
 659         struct uci_context *uci = uci_alloc_context();
 660
 661         while (!list_empty(&leases))
 662                 free_lease(list_first_entry(&leases, struct lease, head));
 663
 664         struct interface *master = NULL, *i, *n;
 665
 666         if (!uci)
 667                 return;
 668
 669         list_for_each_entry(i, &interfaces, head)
 670                 clean_interface(i);
 671
 672         struct uci_package *dhcp = NULL;
 673         if (!uci_load(uci, "dhcp", &dhcp)) {
 674                 struct uci_element *e;
 675                 uci_foreach_element(&dhcp->sections, e) {
 676                         struct uci_section *s = uci_to_section(e);
 677                         if (!strcmp(s->type, "host"))
 678                                 set_lease(s);
 679                         else if (!strcmp(s->type, "odhcpd"))
 680                                 set_config(s);
 681                 }
 682
 683                 uci_foreach_element(&dhcp->sections, e) {
 684                         struct uci_section *s = uci_to_section(e);
 685                         if (!strcmp(s->type, "dhcp"))
 686                                 set_interface(s);
 687                 }
 688         }
 689
 690         if (config.dhcp_statefile) {
 691                 char *path = strdup(config.dhcp_statefile);
 692
 693                 mkdir_p(dirname(path), 0755);
 694                 free(path);
 695         }
 696
 697 #ifdef WITH_UBUS
 698         ubus_apply_network();
 699 #endif
 700
 701         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 702
 703         /* Test for */
 704         list_for_each_entry(i, &interfaces, head) {
 705                 if (i->master)
 706                         continue;
 707
 708                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 709                         any_dhcpv6_slave = true;
 710
 711                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 712                         any_ra_slave = true;
 713
 714                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 715                         any_ndp_slave = true;
 716         }
 717
 718         /* Evaluate hybrid mode for master */
 719         list_for_each_entry(i, &interfaces, head) {
 720                 if (!i->master)
 721                         continue;
 722
 723                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 724 #ifdef WITH_UBUS
 725                 if (!ubus_has_prefix(i->name, i->ifname))
 726                         hybrid_mode = RELAYD_RELAY;
 727 #endif
 728
 729                 if (i->dhcpv6 == RELAYD_HYBRID)
 730                         i->dhcpv6 = hybrid_mode;
 731
 732                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 733                         i->dhcpv6 = RELAYD_DISABLED;
 734
 735                 if (i->ra == RELAYD_HYBRID)
 736                         i->ra = hybrid_mode;
 737
 738                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 739                         i->ra = RELAYD_DISABLED;
 740
 741                 if (i->ndp == RELAYD_HYBRID)
 742                         i->ndp = hybrid_mode;
 743
 744                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 745                         i->ndp = RELAYD_DISABLED;
 746
 747                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 748                         master = i;
 749         }
 750
 751
 752         list_for_each_entry_safe(i, n, &interfaces, head) {
 753                 if (i->inuse) {
 754                         /* Resolve hybrid mode */
 755                         if (i->dhcpv6 == RELAYD_HYBRID)
 756                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 757                                                 RELAYD_RELAY : RELAYD_SERVER;
 758
 759                         if (i->ra == RELAYD_HYBRID)
 760                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 761                                                 RELAYD_RELAY : RELAYD_SERVER;
 762
 763                         if (i->ndp == RELAYD_HYBRID)
 764                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 765                                                 RELAYD_RELAY : RELAYD_DISABLED;
 766
 767                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 768                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 769                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 770                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 771                 } else
 772                         close_interface(i);
 773         }
 774
 775         ndp_handle_addr6_dump();
 776         uci_unload(uci, dhcp);
 777         uci_free_context(uci);
 778 }
 779
 780 static void handle_signal(int signal)
 781 {
 782         char b[1] = {0};
 783
 784         if (signal == SIGHUP) {
 785                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 786         } else
 787                 uloop_end();
 788 }
 789
 790 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 791 {
 792         char b[512];
 793         if (read(u->fd, b, sizeof(b)) < 0) {}
 794
 795         odhcpd_reload();
 796 }
 797
 798 static struct uloop_fd reload_fd = { .cb = reload_cb };
 799
 800 void odhcpd_run(void)
 801 {
 802         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 803
 804         reload_fd.fd = reload_pipe[0];
 805         uloop_fd_add(&reload_fd, ULOOP_READ);
 806
 807         signal(SIGTERM, handle_signal);
 808         signal(SIGINT, handle_signal);
 809         signal(SIGHUP, handle_signal);
 810
 811 #ifdef WITH_UBUS
 812         while (init_ubus())
 813                 sleep(1);
 814 #endif
 815
 816         odhcpd_reload();
 817         uloop_run();
 818
 819         while (!list_empty(&interfaces))
 820                 close_interface(list_first_entry(&interfaces, struct interface, head));
 821 }
 822