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_RA_HOPLIMIT,
  54         IFACE_ATTR_RA_MTU,
  55         IFACE_ATTR_PD_MANAGER,
  56         IFACE_ATTR_PD_CER,
  57         IFACE_ATTR_NDPROXY_ROUTING,
  58         IFACE_ATTR_NDPROXY_SLAVE,
  59         IFACE_ATTR_MAX
  60 };
  61
  62 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  63         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  68         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  70         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  71         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  73         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  79         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  80         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  85         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  86         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  87         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  96         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  97 };
  98
  99 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 100         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 101         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 102         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 103 };
 104
 105 const struct uci_blob_param_list interface_attr_list = {
 106         .n_params = IFACE_ATTR_MAX,
 107         .params = iface_attrs,
 108         .info = iface_attr_info,
 109 };
 110
 111 enum {
 112         LEASE_ATTR_IP,
 113         LEASE_ATTR_MAC,
 114         LEASE_ATTR_DUID,
 115         LEASE_ATTR_HOSTID,
 116         LEASE_ATTR_LEASETIME,
 117         LEASE_ATTR_NAME,
 118         LEASE_ATTR_MAX
 119 };
 120
 121 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 122         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 123         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 124         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 125         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 126         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 127         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 128 };
 129
 130 const struct uci_blob_param_list lease_attr_list = {
 131         .n_params = LEASE_ATTR_MAX,
 132         .params = lease_attrs,
 133 };
 134
 135 enum {
 136         ODHCPD_ATTR_LEGACY,
 137         ODHCPD_ATTR_MAINDHCP,
 138         ODHCPD_ATTR_LEASEFILE,
 139         ODHCPD_ATTR_LEASETRIGGER,
 140         ODHCPD_ATTR_LOGLEVEL,
 141         ODHCPD_ATTR_MAX
 142 };
 143
 144 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 145         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 146         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 147         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 148         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 149         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 150 };
 151
 152 const struct uci_blob_param_list odhcpd_attr_list = {
 153         .n_params = ODHCPD_ATTR_MAX,
 154         .params = odhcpd_attrs,
 155 };
 156
 157 static int mkdir_p(char *dir, mode_t mask)
 158 {
 159         char *l = strrchr(dir, '/');
 160         int ret;
 161
 162         if (!l)
 163                 return 0;
 164
 165         *l = '\0';
 166
 167         if (mkdir_p(dir, mask))
 168                 return -1;
 169
 170         *l = '/';
 171
 172         ret = mkdir(dir, mask);
 173         if (ret && errno == EEXIST)
 174                 return 0;
 175
 176         if (ret)
 177                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 178
 179         return ret;
 180 }
 181
 182 static void free_lease(struct lease *l)
 183 {
 184         if (l->head.next)
 185                 list_del(&l->head);
 186
 187         free(l->duid);
 188         free(l);
 189 }
 190
 191 static struct interface* get_interface(const char *name)
 192 {
 193         struct interface *c;
 194         list_for_each_entry(c, &interfaces, head)
 195                 if (!strcmp(c->name, name))
 196                         return c;
 197         return NULL;
 198 }
 199
 200 static void set_interface_defaults(struct interface *iface)
 201 {
 202         iface->managed = 1;
 203         iface->learn_routes = 1;
 204         iface->dhcpv4_leasetime = 43200;
 205         iface->ra_maxinterval = 600;
 206         iface->ra_mininterval = iface->ra_maxinterval/3;
 207         iface->ra_lifetime = -1;
 208 }
 209
 210 static void clean_interface(struct interface *iface)
 211 {
 212         free(iface->dns);
 213         free(iface->search);
 214         free(iface->upstream);
 215         free(iface->dhcpv4_router);
 216         free(iface->dhcpv4_dns);
 217         free(iface->dhcpv6_raw);
 218         free(iface->filter_class);
 219         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 220         set_interface_defaults(iface);
 221 }
 222
 223 static void close_interface(struct interface *iface)
 224 {
 225         if (iface->head.next)
 226                 list_del(&iface->head);
 227
 228         setup_router_interface(iface, false);
 229         setup_dhcpv6_interface(iface, false);
 230         setup_ndp_interface(iface, false);
 231         setup_dhcpv4_interface(iface, false);
 232
 233         clean_interface(iface);
 234         free(iface);
 235 }
 236
 237 static int parse_mode(const char *mode)
 238 {
 239         if (!strcmp(mode, "disabled"))
 240                 return RELAYD_DISABLED;
 241         else if (!strcmp(mode, "server"))
 242                 return RELAYD_SERVER;
 243         else if (!strcmp(mode, "relay"))
 244                 return RELAYD_RELAY;
 245         else if (!strcmp(mode, "hybrid"))
 246                 return RELAYD_HYBRID;
 247         else
 248                 return -1;
 249 }
 250
 251 static void set_config(struct uci_section *s)
 252 {
 253         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 254
 255         blob_buf_init(&b, 0);
 256         uci_to_blob(&b, s, &odhcpd_attr_list);
 257         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 258
 259         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 260                 config.legacy = blobmsg_get_bool(c);
 261
 262         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 263                 config.main_dhcpv4 = blobmsg_get_bool(c);
 264
 265         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 266                 free(config.dhcp_statefile);
 267                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 268         }
 269
 270         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 271                 free(config.dhcp_cb);
 272                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 273         }
 274
 275         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 276                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 277
 278                 if (config.log_level != log_level) {
 279                         config.log_level = log_level;
 280                         setlogmask(LOG_UPTO(config.log_level));
 281                 }
 282         }
 283 }
 284
 285 static double parse_leasetime(struct blob_attr *c) {
 286         char *val = blobmsg_get_string(c), *endptr = NULL;
 287         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 288
 289         if (time && endptr && endptr[0]) {
 290                 if (endptr[0] == 's')
 291                         time *= 1;
 292                 else if (endptr[0] == 'm')
 293                         time *= 60;
 294                 else if (endptr[0] == 'h')
 295                         time *= 3600;
 296                 else if (endptr[0] == 'd')
 297                         time *= 24 * 3600;
 298                 else if (endptr[0] == 'w')
 299                         time *= 7 * 24 * 3600;
 300                 else
 301                         goto err;
 302         }
 303
 304         if (time < 60)
 305                 time = 60;
 306
 307         return time;
 308
 309 err:
 310         return -1;
 311 }
 312
 313 static int set_lease(struct uci_section *s)
 314 {
 315         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 316
 317         blob_buf_init(&b, 0);
 318         uci_to_blob(&b, s, &lease_attr_list);
 319         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 320
 321         size_t hostlen = 1;
 322         if ((c = tb[LEASE_ATTR_NAME]))
 323                 hostlen = blobmsg_data_len(c);
 324
 325         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 326         if (!lease)
 327                 goto err;
 328
 329         if (hostlen > 1)
 330                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 331
 332         if ((c = tb[LEASE_ATTR_IP]))
 333                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 334                         goto err;
 335
 336         if ((c = tb[LEASE_ATTR_MAC]))
 337                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 338                         goto err;
 339
 340         if ((c = tb[LEASE_ATTR_DUID])) {
 341                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 342                 lease->duid = malloc(duidlen);
 343                 if (!lease->duid)
 344                         goto err;
 345
 346                 ssize_t len = odhcpd_unhexlify(lease->duid,
 347                                 duidlen, blobmsg_get_string(c));
 348
 349                 if (len < 0)
 350                         goto err;
 351
 352                 lease->duid_len = len;
 353         }
 354
 355         if ((c = tb[LEASE_ATTR_HOSTID])) {
 356                 errno = 0;
 357                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 358                 if (errno)
 359                         goto err;
 360         }
 361
 362         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 363                 double time = parse_leasetime(c);
 364                 if (time < 0)
 365                         goto err;
 366
 367                 lease->dhcpv4_leasetime = time;
 368         }
 369
 370         list_add(&lease->head, &leases);
 371         return 0;
 372
 373 err:
 374         if (lease)
 375                 free_lease(lease);
 376
 377         return -1;
 378 }
 379
 380 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 381 {
 382         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 383         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 384
 385         if (tb[IFACE_ATTR_INTERFACE])
 386                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 387
 388         if (!name)
 389                 return -1;
 390
 391         struct interface *iface = get_interface(name);
 392         if (!iface) {
 393                 iface = calloc(1, sizeof(*iface));
 394                 if (!iface)
 395                         return -1;
 396
 397                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 398
 399                 set_interface_defaults(iface);
 400
 401                 list_add(&iface->head, &interfaces);
 402                 overwrite = true;
 403         }
 404
 405         const char *ifname = NULL;
 406         if (overwrite) {
 407                 if ((c = tb[IFACE_ATTR_IFNAME]))
 408                         ifname = blobmsg_get_string(c);
 409                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 410                         ifname = blobmsg_get_string(c);
 411         }
 412
 413 #ifdef WITH_UBUS
 414         if (overwrite || !iface->ifname[0])
 415                 ifname = ubus_get_ifname(name);
 416 #endif
 417
 418         if (!iface->ifname[0] && !ifname)
 419                 goto err;
 420
 421         if (ifname)
 422                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 423
 424         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 425                 goto err;
 426
 427         iface->inuse = true;
 428
 429         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 430                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 431
 432         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 433                 iface->ignore = blobmsg_get_bool(c);
 434
 435         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 436                 double time = parse_leasetime(c);
 437                 if (time < 0)
 438                         goto err;
 439
 440                 iface->dhcpv4_leasetime = time;
 441         }
 442
 443         if ((c = tb[IFACE_ATTR_START])) {
 444                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 445
 446                 if (config.main_dhcpv4 && config.legacy)
 447                         iface->dhcpv4 = RELAYD_SERVER;
 448         }
 449
 450         if ((c = tb[IFACE_ATTR_LIMIT]))
 451                 iface->dhcpv4_end.s_addr = htonl(
 452                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 453
 454         if ((c = tb[IFACE_ATTR_MASTER]))
 455                 iface->master = blobmsg_get_bool(c);
 456
 457         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 458                 struct blob_attr *cur;
 459                 unsigned rem;
 460
 461                 blobmsg_for_each_attr(cur, c, rem) {
 462                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 463                                 continue;
 464
 465                         iface->upstream = realloc(iface->upstream,
 466                                         iface->upstream_len + blobmsg_data_len(cur));
 467                         if (!iface->upstream)
 468                                 goto err;
 469
 470                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 471                         iface->upstream_len += blobmsg_data_len(cur);
 472                 }
 473         }
 474
 475         int mode;
 476         if ((c = tb[IFACE_ATTR_RA])) {
 477                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 478                         iface->ra = mode;
 479                 else
 480                         goto err;
 481         }
 482
 483         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 484                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 485                         if (config.main_dhcpv4)
 486                                 iface->dhcpv4 = mode;
 487                 }
 488                 else
 489                         goto err;
 490         }
 491
 492         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 493                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 494                         iface->dhcpv6 = mode;
 495                 else
 496                         goto err;
 497         }
 498
 499         if ((c = tb[IFACE_ATTR_NDP])) {
 500                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 501                         iface->ndp = mode;
 502                 else
 503                         goto err;
 504         }
 505
 506         if ((c = tb[IFACE_ATTR_ROUTER])) {
 507                 struct blob_attr *cur;
 508                 unsigned rem;
 509
 510                 blobmsg_for_each_attr(cur, c, rem) {
 511                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 512                                 continue;
 513
 514                         struct in_addr addr4;
 515                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 516                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 517                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 518                                 if (!iface->dhcpv4_router)
 519                                         goto err;
 520
 521                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 522                         } else
 523                                 goto err;
 524                 }
 525         }
 526
 527         if ((c = tb[IFACE_ATTR_DNS])) {
 528                 struct blob_attr *cur;
 529                 unsigned rem;
 530
 531                 iface->always_rewrite_dns = true;
 532                 blobmsg_for_each_attr(cur, c, rem) {
 533                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 534                                 continue;
 535
 536                         struct in_addr addr4;
 537                         struct in6_addr addr6;
 538                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 539                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 540                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 541                                 if (!iface->dhcpv4_dns)
 542                                         goto err;
 543
 544                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 545                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 546                                 iface->dns = realloc(iface->dns,
 547                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 548                                 if (!iface->dns)
 549                                         goto err;
 550
 551                                 iface->dns[iface->dns_cnt - 1] = addr6;
 552                         } else
 553                                 goto err;
 554                 }
 555         }
 556
 557         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 558                 struct blob_attr *cur;
 559                 unsigned rem;
 560
 561                 blobmsg_for_each_attr(cur, c, rem) {
 562                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 563                                 continue;
 564
 565                         uint8_t buf[256];
 566                         char *domain = blobmsg_get_string(cur);
 567                         size_t domainlen = strlen(domain);
 568                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 569                                 domain[domainlen - 1] = 0;
 570
 571                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 572                         if (len <= 0)
 573                                 goto err;
 574
 575                         iface->search = realloc(iface->search, iface->search_len + len);
 576                         if (!iface->search)
 577                                 goto err;
 578
 579                         memcpy(&iface->search[iface->search_len], buf, len);
 580                         iface->search_len += len;
 581                 }
 582         }
 583
 584         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 585                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 586                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 587         }
 588
 589         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 590                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 591                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 592                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 593         }
 594
 595         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 596                 iface->default_router = blobmsg_get_u32(c);
 597
 598         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 599                 iface->managed = blobmsg_get_u32(c);
 600
 601         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 602                 iface->ra_hoplimit = blobmsg_get_u32(c);
 603                 if (iface->ra_hoplimit > 255)
 604                         goto err;
 605         }
 606
 607         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 608                 iface->ra_mtu = blobmsg_get_u32(c);
 609                 if (iface->ra_mtu < 1280)
 610                         goto err;
 611         }
 612
 613         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 614                 iface->ra_not_onlink = blobmsg_get_bool(c);
 615
 616         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 617                 iface->ra_advrouter = blobmsg_get_bool(c);
 618
 619         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 620                 iface->ra_mininterval =  blobmsg_get_u32(c);
 621
 622         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 623                 iface->ra_maxinterval = blobmsg_get_u32(c);
 624
 625         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 626                 iface->ra_lifetime = blobmsg_get_u32(c);
 627
 628         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 629                 iface->ra_useleasetime = blobmsg_get_bool(c);
 630
 631         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 632                 const char *prio = blobmsg_get_string(c);
 633
 634                 if (!strcmp(prio, "high"))
 635                         iface->route_preference = 1;
 636                 else if (!strcmp(prio, "low"))
 637                         iface->route_preference = -1;
 638                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 639                         iface->route_preference = 0;
 640                 else
 641                         goto err;
 642         }
 643
 644         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 645                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 646                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 647
 648         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 649                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 650                 goto err;
 651
 652         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 653                 iface->learn_routes = blobmsg_get_bool(c);
 654
 655         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 656                 iface->external = blobmsg_get_bool(c);
 657
 658         return 0;
 659
 660 err:
 661         close_interface(iface);
 662         return -1;
 663 }
 664
 665 static int set_interface(struct uci_section *s)
 666 {
 667         blob_buf_init(&b, 0);
 668         uci_to_blob(&b, s, &interface_attr_list);
 669
 670         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 671 }
 672
 673 void odhcpd_reload(void)
 674 {
 675         struct uci_context *uci = uci_alloc_context();
 676
 677         while (!list_empty(&leases))
 678                 free_lease(list_first_entry(&leases, struct lease, head));
 679
 680         struct interface *master = NULL, *i, *n;
 681
 682         if (!uci)
 683                 return;
 684
 685         list_for_each_entry(i, &interfaces, head)
 686                 clean_interface(i);
 687
 688         struct uci_package *dhcp = NULL;
 689         if (!uci_load(uci, "dhcp", &dhcp)) {
 690                 struct uci_element *e;
 691                 uci_foreach_element(&dhcp->sections, e) {
 692                         struct uci_section *s = uci_to_section(e);
 693                         if (!strcmp(s->type, "host"))
 694                                 set_lease(s);
 695                         else if (!strcmp(s->type, "odhcpd"))
 696                                 set_config(s);
 697                 }
 698
 699                 uci_foreach_element(&dhcp->sections, e) {
 700                         struct uci_section *s = uci_to_section(e);
 701                         if (!strcmp(s->type, "dhcp"))
 702                                 set_interface(s);
 703                 }
 704         }
 705
 706         if (config.dhcp_statefile) {
 707                 char *path = strdup(config.dhcp_statefile);
 708
 709                 mkdir_p(dirname(path), 0755);
 710                 free(path);
 711         }
 712
 713 #ifdef WITH_UBUS
 714         ubus_apply_network();
 715 #endif
 716
 717         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 718
 719         /* Test for */
 720         list_for_each_entry(i, &interfaces, head) {
 721                 if (i->master)
 722                         continue;
 723
 724                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 725                         any_dhcpv6_slave = true;
 726
 727                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 728                         any_ra_slave = true;
 729
 730                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 731                         any_ndp_slave = true;
 732         }
 733
 734         /* Evaluate hybrid mode for master */
 735         list_for_each_entry(i, &interfaces, head) {
 736                 if (!i->master)
 737                         continue;
 738
 739                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 740 #ifdef WITH_UBUS
 741                 if (!ubus_has_prefix(i->name, i->ifname))
 742                         hybrid_mode = RELAYD_RELAY;
 743 #endif
 744
 745                 if (i->dhcpv6 == RELAYD_HYBRID)
 746                         i->dhcpv6 = hybrid_mode;
 747
 748                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 749                         i->dhcpv6 = RELAYD_DISABLED;
 750
 751                 if (i->ra == RELAYD_HYBRID)
 752                         i->ra = hybrid_mode;
 753
 754                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 755                         i->ra = RELAYD_DISABLED;
 756
 757                 if (i->ndp == RELAYD_HYBRID)
 758                         i->ndp = hybrid_mode;
 759
 760                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 761                         i->ndp = RELAYD_DISABLED;
 762
 763                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 764                         master = i;
 765         }
 766
 767
 768         list_for_each_entry_safe(i, n, &interfaces, head) {
 769                 if (i->inuse) {
 770                         /* Resolve hybrid mode */
 771                         if (i->dhcpv6 == RELAYD_HYBRID)
 772                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 773                                                 RELAYD_RELAY : RELAYD_SERVER;
 774
 775                         if (i->ra == RELAYD_HYBRID)
 776                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 777                                                 RELAYD_RELAY : RELAYD_SERVER;
 778
 779                         if (i->ndp == RELAYD_HYBRID)
 780                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 781                                                 RELAYD_RELAY : RELAYD_DISABLED;
 782
 783                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 784                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 785                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 786                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 787                 } else
 788                         close_interface(i);
 789         }
 790
 791         ndp_handle_addr6_dump();
 792         uci_unload(uci, dhcp);
 793         uci_free_context(uci);
 794 }
 795
 796 static void handle_signal(int signal)
 797 {
 798         char b[1] = {0};
 799
 800         if (signal == SIGHUP) {
 801                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 802         } else
 803                 uloop_end();
 804 }
 805
 806 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 807 {
 808         char b[512];
 809         if (read(u->fd, b, sizeof(b)) < 0) {}
 810
 811         odhcpd_reload();
 812 }
 813
 814 static struct uloop_fd reload_fd = { .cb = reload_cb };
 815
 816 void odhcpd_run(void)
 817 {
 818         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 819
 820         reload_fd.fd = reload_pipe[0];
 821         uloop_fd_add(&reload_fd, ULOOP_READ);
 822
 823         signal(SIGTERM, handle_signal);
 824         signal(SIGINT, handle_signal);
 825         signal(SIGHUP, handle_signal);
 826
 827 #ifdef WITH_UBUS
 828         while (init_ubus())
 829                 sleep(1);
 830 #endif
 831
 832         odhcpd_reload();
 833         uloop_run();
 834
 835         while (!list_empty(&interfaces))
 836                 close_interface(list_first_entry(&interfaces, struct interface, head));
 837 }
 838