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