src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <net/if.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <syslog.h>
  11
  12 #include <uci.h>
  13 #include <uci_blob.h>
  14 #include <libubox/utils.h>
  15
  16 #include "odhcpd.h"
  17
  18 static struct blob_buf b;
  19 static int reload_pipe[2];
  20 struct list_head leases = LIST_HEAD_INIT(leases);
  21 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  22 struct config config = {.legacy = false, .main_dhcpv4 = false,
  23                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  24                         .log_level = LOG_INFO};
  25
  26 enum {
  27         IFACE_ATTR_INTERFACE,
  28         IFACE_ATTR_IFNAME,
  29         IFACE_ATTR_NETWORKID,
  30         IFACE_ATTR_DYNAMICDHCP,
  31         IFACE_ATTR_IGNORE,
  32         IFACE_ATTR_LEASETIME,
  33         IFACE_ATTR_LIMIT,
  34         IFACE_ATTR_START,
  35         IFACE_ATTR_MASTER,
  36         IFACE_ATTR_UPSTREAM,
  37         IFACE_ATTR_RA,
  38         IFACE_ATTR_DHCPV4,
  39         IFACE_ATTR_DHCPV6,
  40         IFACE_ATTR_NDP,
  41         IFACE_ATTR_ROUTER,
  42         IFACE_ATTR_DNS,
  43         IFACE_ATTR_DOMAIN,
  44         IFACE_ATTR_FILTER_CLASS,
  45         IFACE_ATTR_DHCPV6_RAW,
  46         IFACE_ATTR_RA_DEFAULT,
  47         IFACE_ATTR_RA_MANAGEMENT,
  48         IFACE_ATTR_RA_OFFLINK,
  49         IFACE_ATTR_RA_PREFERENCE,
  50         IFACE_ATTR_RA_ADVROUTER,
  51         IFACE_ATTR_RA_MININTERVAL,
  52         IFACE_ATTR_RA_MAXINTERVAL,
  53         IFACE_ATTR_RA_LIFETIME,
  54         IFACE_ATTR_RA_USELEASETIME,
  55         IFACE_ATTR_RA_REACHABLETIME,
  56         IFACE_ATTR_RA_RETRANSTIME,
  57         IFACE_ATTR_RA_HOPLIMIT,
  58         IFACE_ATTR_RA_MTU,
  59         IFACE_ATTR_PD_MANAGER,
  60         IFACE_ATTR_PD_CER,
  61         IFACE_ATTR_NDPROXY_ROUTING,
  62         IFACE_ATTR_NDPROXY_SLAVE,
  63         IFACE_ATTR_MAX
  64 };
  65
  66 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  67         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  71         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  74         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  75         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  76         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  79         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  82         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  83         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  84         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  89         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  92         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  97         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
  98         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
  99         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 102         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 103 };
 104
 105 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 106         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 107         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 108         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 109 };
 110
 111 const struct uci_blob_param_list interface_attr_list = {
 112         .n_params = IFACE_ATTR_MAX,
 113         .params = iface_attrs,
 114         .info = iface_attr_info,
 115 };
 116
 117 enum {
 118         LEASE_ATTR_IP,
 119         LEASE_ATTR_MAC,
 120         LEASE_ATTR_DUID,
 121         LEASE_ATTR_HOSTID,
 122         LEASE_ATTR_LEASETIME,
 123         LEASE_ATTR_NAME,
 124         LEASE_ATTR_MAX
 125 };
 126
 127 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 128         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 129         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 130         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 131         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 132         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 133         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 134 };
 135
 136 const struct uci_blob_param_list lease_attr_list = {
 137         .n_params = LEASE_ATTR_MAX,
 138         .params = lease_attrs,
 139 };
 140
 141 enum {
 142         ODHCPD_ATTR_LEGACY,
 143         ODHCPD_ATTR_MAINDHCP,
 144         ODHCPD_ATTR_LEASEFILE,
 145         ODHCPD_ATTR_LEASETRIGGER,
 146         ODHCPD_ATTR_LOGLEVEL,
 147         ODHCPD_ATTR_MAX
 148 };
 149
 150 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 151         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 152         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 153         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 154         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 155         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 156 };
 157
 158 const struct uci_blob_param_list odhcpd_attr_list = {
 159         .n_params = ODHCPD_ATTR_MAX,
 160         .params = odhcpd_attrs,
 161 };
 162
 163 static int mkdir_p(char *dir, mode_t mask)
 164 {
 165         char *l = strrchr(dir, '/');
 166         int ret;
 167
 168         if (!l)
 169                 return 0;
 170
 171         *l = '\0';
 172
 173         if (mkdir_p(dir, mask))
 174                 return -1;
 175
 176         *l = '/';
 177
 178         ret = mkdir(dir, mask);
 179         if (ret && errno == EEXIST)
 180                 return 0;
 181
 182         if (ret)
 183                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 184
 185         return ret;
 186 }
 187
 188 static void free_lease(struct lease *l)
 189 {
 190         if (l->head.next)
 191                 list_del(&l->head);
 192
 193         free(l->duid);
 194         free(l);
 195 }
 196
 197 static struct interface* get_interface(const char *name)
 198 {
 199         struct interface *c;
 200         list_for_each_entry(c, &interfaces, head)
 201                 if (!strcmp(c->name, name))
 202                         return c;
 203         return NULL;
 204 }
 205
 206 static void set_interface_defaults(struct interface *iface)
 207 {
 208         iface->managed = 1;
 209         iface->learn_routes = 1;
 210         iface->dhcpv4_leasetime = 43200;
 211         iface->ra_maxinterval = 600;
 212         iface->ra_mininterval = iface->ra_maxinterval/3;
 213         iface->ra_lifetime = -1;
 214 }
 215
 216 static void clean_interface(struct interface *iface)
 217 {
 218         free(iface->dns);
 219         free(iface->search);
 220         free(iface->upstream);
 221         free(iface->dhcpv4_router);
 222         free(iface->dhcpv4_dns);
 223         free(iface->dhcpv6_raw);
 224         free(iface->filter_class);
 225         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 226         set_interface_defaults(iface);
 227 }
 228
 229 static void close_interface(struct interface *iface)
 230 {
 231         if (iface->head.next)
 232                 list_del(&iface->head);
 233
 234         setup_router_interface(iface, false);
 235         setup_dhcpv6_interface(iface, false);
 236         setup_ndp_interface(iface, false);
 237         setup_dhcpv4_interface(iface, false);
 238
 239         clean_interface(iface);
 240         free(iface->ifname);
 241         free(iface);
 242 }
 243
 244 static int parse_mode(const char *mode)
 245 {
 246         if (!strcmp(mode, "disabled"))
 247                 return RELAYD_DISABLED;
 248         else if (!strcmp(mode, "server"))
 249                 return RELAYD_SERVER;
 250         else if (!strcmp(mode, "relay"))
 251                 return RELAYD_RELAY;
 252         else if (!strcmp(mode, "hybrid"))
 253                 return RELAYD_HYBRID;
 254         else
 255                 return -1;
 256 }
 257
 258 static void set_config(struct uci_section *s)
 259 {
 260         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 261
 262         blob_buf_init(&b, 0);
 263         uci_to_blob(&b, s, &odhcpd_attr_list);
 264         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 265
 266         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 267                 config.legacy = blobmsg_get_bool(c);
 268
 269         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 270                 config.main_dhcpv4 = blobmsg_get_bool(c);
 271
 272         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 273                 free(config.dhcp_statefile);
 274                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 275         }
 276
 277         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 278                 free(config.dhcp_cb);
 279                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 280         }
 281
 282         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 283                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 284
 285                 if (config.log_level != log_level) {
 286                         config.log_level = log_level;
 287                         setlogmask(LOG_UPTO(config.log_level));
 288                 }
 289         }
 290 }
 291
 292 static double parse_leasetime(struct blob_attr *c) {
 293         char *val = blobmsg_get_string(c), *endptr = NULL;
 294         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 295
 296         if (time && endptr && endptr[0]) {
 297                 if (endptr[0] == 's')
 298                         time *= 1;
 299                 else if (endptr[0] == 'm')
 300                         time *= 60;
 301                 else if (endptr[0] == 'h')
 302                         time *= 3600;
 303                 else if (endptr[0] == 'd')
 304                         time *= 24 * 3600;
 305                 else if (endptr[0] == 'w')
 306                         time *= 7 * 24 * 3600;
 307                 else
 308                         goto err;
 309         }
 310
 311         if (time < 60)
 312                 time = 60;
 313
 314         return time;
 315
 316 err:
 317         return -1;
 318 }
 319
 320 static int set_lease(struct uci_section *s)
 321 {
 322         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 323
 324         blob_buf_init(&b, 0);
 325         uci_to_blob(&b, s, &lease_attr_list);
 326         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 327
 328         size_t hostlen = 1;
 329         if ((c = tb[LEASE_ATTR_NAME]))
 330                 hostlen = blobmsg_data_len(c);
 331
 332         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 333         if (!lease)
 334                 goto err;
 335
 336         if (hostlen > 1)
 337                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 338
 339         if ((c = tb[LEASE_ATTR_IP]))
 340                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 341                         goto err;
 342
 343         if ((c = tb[LEASE_ATTR_MAC]))
 344                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 345                         goto err;
 346
 347         if ((c = tb[LEASE_ATTR_DUID])) {
 348                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 349                 lease->duid = malloc(duidlen);
 350                 if (!lease->duid)
 351                         goto err;
 352
 353                 ssize_t len = odhcpd_unhexlify(lease->duid,
 354                                 duidlen, blobmsg_get_string(c));
 355
 356                 if (len < 0)
 357                         goto err;
 358
 359                 lease->duid_len = len;
 360         }
 361
 362         if ((c = tb[LEASE_ATTR_HOSTID])) {
 363                 errno = 0;
 364                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 365                 if (errno)
 366                         goto err;
 367         }
 368
 369         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 370                 double time = parse_leasetime(c);
 371                 if (time < 0)
 372                         goto err;
 373
 374                 lease->dhcpv4_leasetime = time;
 375         }
 376
 377         list_add(&lease->head, &leases);
 378         return 0;
 379
 380 err:
 381         if (lease)
 382                 free_lease(lease);
 383
 384         return -1;
 385 }
 386
 387 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 388 {
 389         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 390         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 391
 392         if (tb[IFACE_ATTR_INTERFACE])
 393                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 394
 395         if (!name)
 396                 return -1;
 397
 398         struct interface *iface = get_interface(name);
 399         if (!iface) {
 400                 char *iface_name;
 401
 402                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 403                 if (!iface)
 404                         return -1;
 405
 406                 iface->name = strcpy(iface_name, name);
 407
 408                 set_interface_defaults(iface);
 409
 410                 list_add(&iface->head, &interfaces);
 411                 overwrite = true;
 412         }
 413
 414         const char *ifname = NULL;
 415         if (overwrite) {
 416                 if ((c = tb[IFACE_ATTR_IFNAME]))
 417                         ifname = blobmsg_get_string(c);
 418                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 419                         ifname = blobmsg_get_string(c);
 420         }
 421
 422 #ifdef WITH_UBUS
 423         if (overwrite || !iface->ifname)
 424                 ifname = ubus_get_ifname(name);
 425 #endif
 426
 427         if (!iface->ifname && !ifname)
 428                 goto err;
 429
 430         if (ifname) {
 431                 free(iface->ifname);
 432                 iface->ifname = strdup(ifname);
 433
 434                 if (!iface->ifname)
 435                         goto err;
 436         }
 437
 438         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 439                 goto err;
 440
 441         iface->inuse = true;
 442
 443         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 444                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 445
 446         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 447                 iface->ignore = blobmsg_get_bool(c);
 448
 449         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 450                 double time = parse_leasetime(c);
 451                 if (time < 0)
 452                         goto err;
 453
 454                 iface->dhcpv4_leasetime = time;
 455         }
 456
 457         if ((c = tb[IFACE_ATTR_START])) {
 458                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 459
 460                 if (config.main_dhcpv4 && config.legacy)
 461                         iface->dhcpv4 = RELAYD_SERVER;
 462         }
 463
 464         if ((c = tb[IFACE_ATTR_LIMIT]))
 465                 iface->dhcpv4_end.s_addr = htonl(
 466                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 467
 468         if ((c = tb[IFACE_ATTR_MASTER]))
 469                 iface->master = blobmsg_get_bool(c);
 470
 471         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 472                 struct blob_attr *cur;
 473                 unsigned rem;
 474
 475                 blobmsg_for_each_attr(cur, c, rem) {
 476                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 477                                 continue;
 478
 479                         iface->upstream = realloc(iface->upstream,
 480                                         iface->upstream_len + blobmsg_data_len(cur));
 481                         if (!iface->upstream)
 482                                 goto err;
 483
 484                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 485                         iface->upstream_len += blobmsg_data_len(cur);
 486                 }
 487         }
 488
 489         int mode;
 490         if ((c = tb[IFACE_ATTR_RA])) {
 491                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 492                         iface->ra = mode;
 493                 else
 494                         goto err;
 495         }
 496
 497         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 498                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 499                         if (config.main_dhcpv4)
 500                                 iface->dhcpv4 = mode;
 501                 }
 502                 else
 503                         goto err;
 504         }
 505
 506         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 507                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 508                         iface->dhcpv6 = mode;
 509                 else
 510                         goto err;
 511         }
 512
 513         if ((c = tb[IFACE_ATTR_NDP])) {
 514                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 515                         iface->ndp = mode;
 516                 else
 517                         goto err;
 518         }
 519
 520         if ((c = tb[IFACE_ATTR_ROUTER])) {
 521                 struct blob_attr *cur;
 522                 unsigned rem;
 523
 524                 blobmsg_for_each_attr(cur, c, rem) {
 525                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 526                                 continue;
 527
 528                         struct in_addr addr4;
 529                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 530                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 531                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 532                                 if (!iface->dhcpv4_router)
 533                                         goto err;
 534
 535                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 536                         } else
 537                                 goto err;
 538                 }
 539         }
 540
 541         if ((c = tb[IFACE_ATTR_DNS])) {
 542                 struct blob_attr *cur;
 543                 unsigned rem;
 544
 545                 iface->always_rewrite_dns = true;
 546                 blobmsg_for_each_attr(cur, c, rem) {
 547                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 548                                 continue;
 549
 550                         struct in_addr addr4;
 551                         struct in6_addr addr6;
 552                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 553                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 554                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 555                                 if (!iface->dhcpv4_dns)
 556                                         goto err;
 557
 558                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 559                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 560                                 iface->dns = realloc(iface->dns,
 561                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 562                                 if (!iface->dns)
 563                                         goto err;
 564
 565                                 iface->dns[iface->dns_cnt - 1] = addr6;
 566                         } else
 567                                 goto err;
 568                 }
 569         }
 570
 571         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 572                 struct blob_attr *cur;
 573                 unsigned rem;
 574
 575                 blobmsg_for_each_attr(cur, c, rem) {
 576                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 577                                 continue;
 578
 579                         uint8_t buf[256];
 580                         char *domain = blobmsg_get_string(cur);
 581                         size_t domainlen = strlen(domain);
 582                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 583                                 domain[domainlen - 1] = 0;
 584
 585                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 586                         if (len <= 0)
 587                                 goto err;
 588
 589                         iface->search = realloc(iface->search, iface->search_len + len);
 590                         if (!iface->search)
 591                                 goto err;
 592
 593                         memcpy(&iface->search[iface->search_len], buf, len);
 594                         iface->search_len += len;
 595                 }
 596         }
 597
 598         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 599                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 600                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 601         }
 602
 603         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 604                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 605                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 606                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 607         }
 608
 609         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 610                 iface->default_router = blobmsg_get_u32(c);
 611
 612         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 613                 iface->managed = blobmsg_get_u32(c);
 614
 615         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 616                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 617                 if (ra_reachabletime > 3600000)
 618                         goto err;
 619
 620                 iface->ra_reachabletime = ra_reachabletime;
 621         }
 622
 623         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 624                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 625                 if (ra_retranstime > 60000)
 626                         goto err;
 627
 628                 iface->ra_retranstime = ra_retranstime;
 629         }
 630
 631         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 632                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 633                 if (ra_hoplimit > 255)
 634                         goto err;
 635
 636                 iface->ra_hoplimit = ra_hoplimit;
 637         }
 638
 639         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 640                 uint32_t ra_mtu = blobmsg_get_u32(c);
 641                 if (ra_mtu < 1280 || ra_mtu > 65535)
 642                         goto err;
 643
 644                 iface->ra_mtu = ra_mtu;
 645         }
 646
 647         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 648                 iface->ra_not_onlink = blobmsg_get_bool(c);
 649
 650         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 651                 iface->ra_advrouter = blobmsg_get_bool(c);
 652
 653         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 654                 iface->ra_mininterval =  blobmsg_get_u32(c);
 655
 656         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 657                 iface->ra_maxinterval = blobmsg_get_u32(c);
 658
 659         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 660                 iface->ra_lifetime = blobmsg_get_u32(c);
 661
 662         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 663                 iface->ra_useleasetime = blobmsg_get_bool(c);
 664
 665         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 666                 const char *prio = blobmsg_get_string(c);
 667
 668                 if (!strcmp(prio, "high"))
 669                         iface->route_preference = 1;
 670                 else if (!strcmp(prio, "low"))
 671                         iface->route_preference = -1;
 672                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 673                         iface->route_preference = 0;
 674                 else
 675                         goto err;
 676         }
 677
 678         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 679                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 680                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 681
 682         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 683                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 684                 goto err;
 685
 686         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 687                 iface->learn_routes = blobmsg_get_bool(c);
 688
 689         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 690                 iface->external = blobmsg_get_bool(c);
 691
 692         return 0;
 693
 694 err:
 695         close_interface(iface);
 696         return -1;
 697 }
 698
 699 static int set_interface(struct uci_section *s)
 700 {
 701         blob_buf_init(&b, 0);
 702         uci_to_blob(&b, s, &interface_attr_list);
 703
 704         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 705 }
 706
 707 void odhcpd_reload(void)
 708 {
 709         struct uci_context *uci = uci_alloc_context();
 710
 711         while (!list_empty(&leases))
 712                 free_lease(list_first_entry(&leases, struct lease, head));
 713
 714         struct interface *master = NULL, *i, *n;
 715
 716         if (!uci)
 717                 return;
 718
 719         list_for_each_entry(i, &interfaces, head)
 720                 clean_interface(i);
 721
 722         struct uci_package *dhcp = NULL;
 723         if (!uci_load(uci, "dhcp", &dhcp)) {
 724                 struct uci_element *e;
 725                 uci_foreach_element(&dhcp->sections, e) {
 726                         struct uci_section *s = uci_to_section(e);
 727                         if (!strcmp(s->type, "host"))
 728                                 set_lease(s);
 729                         else if (!strcmp(s->type, "odhcpd"))
 730                                 set_config(s);
 731                 }
 732
 733                 uci_foreach_element(&dhcp->sections, e) {
 734                         struct uci_section *s = uci_to_section(e);
 735                         if (!strcmp(s->type, "dhcp"))
 736                                 set_interface(s);
 737                 }
 738         }
 739
 740         if (config.dhcp_statefile) {
 741                 char *path = strdup(config.dhcp_statefile);
 742
 743                 mkdir_p(dirname(path), 0755);
 744                 free(path);
 745         }
 746
 747 #ifdef WITH_UBUS
 748         ubus_apply_network();
 749 #endif
 750
 751         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 752
 753         /* Test for */
 754         list_for_each_entry(i, &interfaces, head) {
 755                 if (i->master)
 756                         continue;
 757
 758                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 759                         any_dhcpv6_slave = true;
 760
 761                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 762                         any_ra_slave = true;
 763
 764                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 765                         any_ndp_slave = true;
 766         }
 767
 768         /* Evaluate hybrid mode for master */
 769         list_for_each_entry(i, &interfaces, head) {
 770                 if (!i->master)
 771                         continue;
 772
 773                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 774 #ifdef WITH_UBUS
 775                 if (!ubus_has_prefix(i->name, i->ifname))
 776                         hybrid_mode = RELAYD_RELAY;
 777 #endif
 778
 779                 if (i->dhcpv6 == RELAYD_HYBRID)
 780                         i->dhcpv6 = hybrid_mode;
 781
 782                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 783                         i->dhcpv6 = RELAYD_DISABLED;
 784
 785                 if (i->ra == RELAYD_HYBRID)
 786                         i->ra = hybrid_mode;
 787
 788                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 789                         i->ra = RELAYD_DISABLED;
 790
 791                 if (i->ndp == RELAYD_HYBRID)
 792                         i->ndp = hybrid_mode;
 793
 794                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 795                         i->ndp = RELAYD_DISABLED;
 796
 797                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 798                         master = i;
 799         }
 800
 801
 802         list_for_each_entry_safe(i, n, &interfaces, head) {
 803                 if (i->inuse) {
 804                         /* Resolve hybrid mode */
 805                         if (i->dhcpv6 == RELAYD_HYBRID)
 806                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 807                                                 RELAYD_RELAY : RELAYD_SERVER;
 808
 809                         if (i->ra == RELAYD_HYBRID)
 810                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 811                                                 RELAYD_RELAY : RELAYD_SERVER;
 812
 813                         if (i->ndp == RELAYD_HYBRID)
 814                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 815                                                 RELAYD_RELAY : RELAYD_DISABLED;
 816
 817                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 818                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 819                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 820                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 821                 } else
 822                         close_interface(i);
 823         }
 824
 825         ndp_handle_addr6_dump();
 826         uci_unload(uci, dhcp);
 827         uci_free_context(uci);
 828 }
 829
 830 static void handle_signal(int signal)
 831 {
 832         char b[1] = {0};
 833
 834         if (signal == SIGHUP) {
 835                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 836         } else
 837                 uloop_end();
 838 }
 839
 840 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 841 {
 842         char b[512];
 843         if (read(u->fd, b, sizeof(b)) < 0) {}
 844
 845         odhcpd_reload();
 846 }
 847
 848 static struct uloop_fd reload_fd = { .cb = reload_cb };
 849
 850 void odhcpd_run(void)
 851 {
 852         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 853
 854         reload_fd.fd = reload_pipe[0];
 855         uloop_fd_add(&reload_fd, ULOOP_READ);
 856
 857         signal(SIGTERM, handle_signal);
 858         signal(SIGINT, handle_signal);
 859         signal(SIGHUP, handle_signal);
 860
 861 #ifdef WITH_UBUS
 862         while (init_ubus())
 863                 sleep(1);
 864 #endif
 865
 866         odhcpd_reload();
 867         uloop_run();
 868
 869         while (!list_empty(&interfaces))
 870                 close_interface(list_first_entry(&interfaces, struct interface, head));
 871 }
 872