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_DHCPV4_FORCERECONF,
  46         IFACE_ATTR_DHCPV6_RAW,
  47         IFACE_ATTR_DHCPV6_ASSIGNALL,
  48         IFACE_ATTR_RA_DEFAULT,
  49         IFACE_ATTR_RA_MANAGEMENT,
  50         IFACE_ATTR_RA_OFFLINK,
  51         IFACE_ATTR_RA_PREFERENCE,
  52         IFACE_ATTR_RA_ADVROUTER,
  53         IFACE_ATTR_RA_MININTERVAL,
  54         IFACE_ATTR_RA_MAXINTERVAL,
  55         IFACE_ATTR_RA_LIFETIME,
  56         IFACE_ATTR_RA_USELEASETIME,
  57         IFACE_ATTR_RA_REACHABLETIME,
  58         IFACE_ATTR_RA_RETRANSTIME,
  59         IFACE_ATTR_RA_HOPLIMIT,
  60         IFACE_ATTR_RA_MTU,
  61         IFACE_ATTR_RA_DNS,
  62         IFACE_ATTR_PD_MANAGER,
  63         IFACE_ATTR_PD_CER,
  64         IFACE_ATTR_NDPROXY_ROUTING,
  65         IFACE_ATTR_NDPROXY_SLAVE,
  66         IFACE_ATTR_PREFIX_FILTER,
  67         IFACE_ATTR_MAX
  68 };
  69
  70 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  71         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  75         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  76         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  78         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  79         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  80         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  81         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  86         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  87         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  88         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
  90         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  91         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  92         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  97         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  99         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 102         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 103         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 104         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 105         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 106         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 107         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 108         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 109         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 110         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 111 };
 112
 113 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 114         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 115         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 116         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 117 };
 118
 119 const struct uci_blob_param_list interface_attr_list = {
 120         .n_params = IFACE_ATTR_MAX,
 121         .params = iface_attrs,
 122         .info = iface_attr_info,
 123 };
 124
 125 enum {
 126         LEASE_ATTR_IP,
 127         LEASE_ATTR_MAC,
 128         LEASE_ATTR_DUID,
 129         LEASE_ATTR_HOSTID,
 130         LEASE_ATTR_LEASETIME,
 131         LEASE_ATTR_NAME,
 132         LEASE_ATTR_MAX
 133 };
 134
 135 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 136         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 137         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 138         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 139         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 140         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 141         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 142 };
 143
 144 const struct uci_blob_param_list lease_attr_list = {
 145         .n_params = LEASE_ATTR_MAX,
 146         .params = lease_attrs,
 147 };
 148
 149 enum {
 150         ODHCPD_ATTR_LEGACY,
 151         ODHCPD_ATTR_MAINDHCP,
 152         ODHCPD_ATTR_LEASEFILE,
 153         ODHCPD_ATTR_LEASETRIGGER,
 154         ODHCPD_ATTR_LOGLEVEL,
 155         ODHCPD_ATTR_MAX
 156 };
 157
 158 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 159         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 160         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 161         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 162         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 163         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 164 };
 165
 166 const struct uci_blob_param_list odhcpd_attr_list = {
 167         .n_params = ODHCPD_ATTR_MAX,
 168         .params = odhcpd_attrs,
 169 };
 170
 171 static int mkdir_p(char *dir, mode_t mask)
 172 {
 173         char *l = strrchr(dir, '/');
 174         int ret;
 175
 176         if (!l)
 177                 return 0;
 178
 179         *l = '\0';
 180
 181         if (mkdir_p(dir, mask))
 182                 return -1;
 183
 184         *l = '/';
 185
 186         ret = mkdir(dir, mask);
 187         if (ret && errno == EEXIST)
 188                 return 0;
 189
 190         if (ret)
 191                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 192
 193         return ret;
 194 }
 195
 196 static void free_lease(struct lease *l)
 197 {
 198         if (l->head.next)
 199                 list_del(&l->head);
 200
 201         free(l->duid);
 202         free(l);
 203 }
 204
 205 static struct interface* get_interface(const char *name)
 206 {
 207         struct interface *c;
 208         list_for_each_entry(c, &interfaces, head)
 209                 if (!strcmp(c->name, name))
 210                         return c;
 211         return NULL;
 212 }
 213
 214 static void set_interface_defaults(struct interface *iface)
 215 {
 216         iface->learn_routes = 1;
 217         iface->dhcpv4_leasetime = 43200;
 218         iface->dhcpv6_assignall = true;
 219         iface->ra_managed = RA_MANAGED_MFLAG;
 220         iface->ra_maxinterval = 600;
 221         iface->ra_mininterval = iface->ra_maxinterval/3;
 222         iface->ra_lifetime = -1;
 223         iface->ra_dns = true;
 224 }
 225
 226 static void clean_interface(struct interface *iface)
 227 {
 228         free(iface->dns);
 229         free(iface->search);
 230         free(iface->upstream);
 231         free(iface->dhcpv4_router);
 232         free(iface->dhcpv4_dns);
 233         free(iface->dhcpv6_raw);
 234         free(iface->filter_class);
 235         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 236         set_interface_defaults(iface);
 237 }
 238
 239 static void close_interface(struct interface *iface)
 240 {
 241         if (iface->head.next)
 242                 list_del(&iface->head);
 243
 244         router_setup_interface(iface, false);
 245         dhcpv6_setup_interface(iface, false);
 246         ndp_setup_interface(iface, false);
 247 #ifdef DHCPV4_SUPPORT
 248         dhcpv4_setup_interface(iface, false);
 249 #endif
 250
 251         clean_interface(iface);
 252         free(iface->addr4);
 253         free(iface->addr6);
 254         free(iface->ifname);
 255         free(iface);
 256 }
 257
 258 static int parse_mode(const char *mode)
 259 {
 260         if (!strcmp(mode, "disabled"))
 261                 return MODE_DISABLED;
 262         else if (!strcmp(mode, "server"))
 263                 return MODE_SERVER;
 264         else if (!strcmp(mode, "relay"))
 265                 return MODE_RELAY;
 266         else if (!strcmp(mode, "hybrid"))
 267                 return MODE_HYBRID;
 268         else
 269                 return -1;
 270 }
 271
 272 static void set_config(struct uci_section *s)
 273 {
 274         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 275
 276         blob_buf_init(&b, 0);
 277         uci_to_blob(&b, s, &odhcpd_attr_list);
 278         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 279
 280         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 281                 config.legacy = blobmsg_get_bool(c);
 282
 283         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 284                 config.main_dhcpv4 = blobmsg_get_bool(c);
 285
 286         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 287                 free(config.dhcp_statefile);
 288                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 289         }
 290
 291         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 292                 free(config.dhcp_cb);
 293                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 294         }
 295
 296         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 297                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 298
 299                 if (config.log_level != log_level) {
 300                         config.log_level = log_level;
 301                         setlogmask(LOG_UPTO(config.log_level));
 302                 }
 303         }
 304 }
 305
 306 static double parse_leasetime(struct blob_attr *c) {
 307         char *val = blobmsg_get_string(c), *endptr = NULL;
 308         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 309
 310         if (time && endptr && endptr[0]) {
 311                 if (endptr[0] == 's')
 312                         time *= 1;
 313                 else if (endptr[0] == 'm')
 314                         time *= 60;
 315                 else if (endptr[0] == 'h')
 316                         time *= 3600;
 317                 else if (endptr[0] == 'd')
 318                         time *= 24 * 3600;
 319                 else if (endptr[0] == 'w')
 320                         time *= 7 * 24 * 3600;
 321                 else
 322                         goto err;
 323         }
 324
 325         if (time < 60)
 326                 time = 60;
 327
 328         return time;
 329
 330 err:
 331         return -1;
 332 }
 333
 334 static int set_lease(struct uci_section *s)
 335 {
 336         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 337
 338         blob_buf_init(&b, 0);
 339         uci_to_blob(&b, s, &lease_attr_list);
 340         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 341
 342         size_t hostlen = 1;
 343         if ((c = tb[LEASE_ATTR_NAME]))
 344                 hostlen = blobmsg_data_len(c);
 345
 346         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 347         if (!lease)
 348                 goto err;
 349
 350         if (hostlen > 1) {
 351                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 352                 if (!odhcpd_valid_hostname(lease->hostname))
 353                         goto err;
 354         }
 355
 356         if ((c = tb[LEASE_ATTR_IP]))
 357                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 358                         goto err;
 359
 360         if ((c = tb[LEASE_ATTR_MAC]))
 361                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 362                         goto err;
 363
 364         if ((c = tb[LEASE_ATTR_DUID])) {
 365                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 366                 lease->duid = malloc(duidlen);
 367                 if (!lease->duid)
 368                         goto err;
 369
 370                 ssize_t len = odhcpd_unhexlify(lease->duid,
 371                                 duidlen, blobmsg_get_string(c));
 372
 373                 if (len < 0)
 374                         goto err;
 375
 376                 lease->duid_len = len;
 377         }
 378
 379         if ((c = tb[LEASE_ATTR_HOSTID])) {
 380                 errno = 0;
 381                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 382                 if (errno)
 383                         goto err;
 384         }
 385
 386         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 387                 double time = parse_leasetime(c);
 388                 if (time < 0)
 389                         goto err;
 390
 391                 lease->dhcpv4_leasetime = time;
 392         }
 393
 394         list_add(&lease->head, &leases);
 395         return 0;
 396
 397 err:
 398         if (lease)
 399                 free_lease(lease);
 400
 401         return -1;
 402 }
 403
 404 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 405 {
 406         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 407         bool get_addrs = false;
 408
 409         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 410
 411         if (tb[IFACE_ATTR_INTERFACE])
 412                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 413
 414         if (!name)
 415                 return -1;
 416
 417         struct interface *iface = get_interface(name);
 418         if (!iface) {
 419                 char *iface_name;
 420
 421                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 422                 if (!iface)
 423                         return -1;
 424
 425                 iface->name = strcpy(iface_name, name);
 426
 427                 set_interface_defaults(iface);
 428
 429                 list_add(&iface->head, &interfaces);
 430                 get_addrs = overwrite = true;
 431         }
 432
 433         const char *ifname = NULL;
 434         if (overwrite) {
 435                 if ((c = tb[IFACE_ATTR_IFNAME]))
 436                         ifname = blobmsg_get_string(c);
 437                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 438                         ifname = blobmsg_get_string(c);
 439         }
 440
 441 #ifdef WITH_UBUS
 442         if (overwrite || !iface->ifname)
 443                 ifname = ubus_get_ifname(name);
 444 #endif
 445
 446         if (!iface->ifname && !ifname)
 447                 goto err;
 448
 449         if (ifname) {
 450                 free(iface->ifname);
 451                 iface->ifname = strdup(ifname);
 452
 453                 if (!iface->ifname)
 454                         goto err;
 455
 456                 if (!iface->ifindex &&
 457                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 458                         goto err;
 459         }
 460
 461         if (get_addrs) {
 462                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 463                                                 true, &iface->addr6);
 464
 465                 if (len > 0)
 466                         iface->addr6_len = len;
 467
 468                 len = netlink_get_interface_addrs(iface->ifindex,
 469                                                 false, &iface->addr4);
 470                 if (len > 0)
 471                         iface->addr4_len = len;
 472         }
 473
 474         iface->inuse = true;
 475
 476         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 477                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 478
 479         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 480                 iface->ignore = blobmsg_get_bool(c);
 481
 482         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 483                 double time = parse_leasetime(c);
 484                 if (time < 0)
 485                         goto err;
 486
 487                 iface->dhcpv4_leasetime = time;
 488         }
 489
 490         if ((c = tb[IFACE_ATTR_START])) {
 491                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 492
 493                 if (config.main_dhcpv4 && config.legacy)
 494                         iface->dhcpv4 = MODE_SERVER;
 495         }
 496
 497         if ((c = tb[IFACE_ATTR_LIMIT]))
 498                 iface->dhcpv4_end.s_addr = htonl(
 499                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 500
 501         if ((c = tb[IFACE_ATTR_MASTER]))
 502                 iface->master = blobmsg_get_bool(c);
 503
 504         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 505                 struct blob_attr *cur;
 506                 unsigned rem;
 507
 508                 blobmsg_for_each_attr(cur, c, rem) {
 509                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 510                                 continue;
 511
 512                         iface->upstream = realloc(iface->upstream,
 513                                         iface->upstream_len + blobmsg_data_len(cur));
 514                         if (!iface->upstream)
 515                                 goto err;
 516
 517                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 518                         iface->upstream_len += blobmsg_data_len(cur);
 519                 }
 520         }
 521
 522         int mode;
 523         if ((c = tb[IFACE_ATTR_RA])) {
 524                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 525                         iface->ra = mode;
 526                 else
 527                         goto err;
 528         }
 529
 530         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 531                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 532                         if (config.main_dhcpv4)
 533                                 iface->dhcpv4 = mode;
 534                 }
 535                 else
 536                         goto err;
 537         }
 538
 539         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 540                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 541                         iface->dhcpv6 = mode;
 542                 else
 543                         goto err;
 544         }
 545
 546         if ((c = tb[IFACE_ATTR_NDP])) {
 547                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 548                         iface->ndp = mode;
 549                 else
 550                         goto err;
 551         }
 552
 553         if ((c = tb[IFACE_ATTR_ROUTER])) {
 554                 struct blob_attr *cur;
 555                 unsigned rem;
 556
 557                 blobmsg_for_each_attr(cur, c, rem) {
 558                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 559                                 continue;
 560
 561                         struct in_addr addr4;
 562                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 563                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 564                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 565                                 if (!iface->dhcpv4_router)
 566                                         goto err;
 567
 568                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 569                         } else
 570                                 goto err;
 571                 }
 572         }
 573
 574         if ((c = tb[IFACE_ATTR_DNS])) {
 575                 struct blob_attr *cur;
 576                 unsigned rem;
 577
 578                 iface->always_rewrite_dns = true;
 579                 blobmsg_for_each_attr(cur, c, rem) {
 580                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 581                                 continue;
 582
 583                         struct in_addr addr4;
 584                         struct in6_addr addr6;
 585                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 586                                 if (addr4.s_addr == INADDR_ANY)
 587                                         goto err;
 588
 589                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 590                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 591                                 if (!iface->dhcpv4_dns)
 592                                         goto err;
 593
 594                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 595                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 596                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 597                                         goto err;
 598
 599                                 iface->dns = realloc(iface->dns,
 600                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 601                                 if (!iface->dns)
 602                                         goto err;
 603
 604                                 iface->dns[iface->dns_cnt - 1] = addr6;
 605                         } else
 606                                 goto err;
 607                 }
 608         }
 609
 610         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 611                 struct blob_attr *cur;
 612                 unsigned rem;
 613
 614                 blobmsg_for_each_attr(cur, c, rem) {
 615                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 616                                 continue;
 617
 618                         uint8_t buf[256];
 619                         char *domain = blobmsg_get_string(cur);
 620                         size_t domainlen = strlen(domain);
 621                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 622                                 domain[domainlen - 1] = 0;
 623
 624                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 625                         if (len <= 0)
 626                                 goto err;
 627
 628                         iface->search = realloc(iface->search, iface->search_len + len);
 629                         if (!iface->search)
 630                                 goto err;
 631
 632                         memcpy(&iface->search[iface->search_len], buf, len);
 633                         iface->search_len += len;
 634                 }
 635         }
 636
 637         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 638                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 639                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 640         }
 641
 642         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 643                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 644
 645         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 646                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 647                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 648                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 649         }
 650
 651         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 652                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 653
 654         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 655                 iface->default_router = blobmsg_get_u32(c);
 656
 657         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 658                 iface->ra_managed = blobmsg_get_u32(c);
 659
 660         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 661                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 662                 if (ra_reachabletime > 3600000)
 663                         goto err;
 664
 665                 iface->ra_reachabletime = ra_reachabletime;
 666         }
 667
 668         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 669                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 670                 if (ra_retranstime > 60000)
 671                         goto err;
 672
 673                 iface->ra_retranstime = ra_retranstime;
 674         }
 675
 676         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 677                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 678                 if (ra_hoplimit > 255)
 679                         goto err;
 680
 681                 iface->ra_hoplimit = ra_hoplimit;
 682         }
 683
 684         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 685                 uint32_t ra_mtu = blobmsg_get_u32(c);
 686                 if (ra_mtu < 1280 || ra_mtu > 65535)
 687                         goto err;
 688
 689                 iface->ra_mtu = ra_mtu;
 690         }
 691
 692         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 693                 iface->ra_not_onlink = blobmsg_get_bool(c);
 694
 695         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 696                 iface->ra_advrouter = blobmsg_get_bool(c);
 697
 698         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 699                 iface->ra_mininterval =  blobmsg_get_u32(c);
 700
 701         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 702                 iface->ra_maxinterval = blobmsg_get_u32(c);
 703
 704         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 705                 iface->ra_lifetime = blobmsg_get_u32(c);
 706
 707         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 708                 iface->ra_useleasetime = blobmsg_get_bool(c);
 709
 710         if ((c = tb[IFACE_ATTR_RA_DNS]))
 711                 iface->ra_dns = blobmsg_get_bool(c);
 712
 713         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 714                 const char *prio = blobmsg_get_string(c);
 715
 716                 if (!strcmp(prio, "high"))
 717                         iface->route_preference = 1;
 718                 else if (!strcmp(prio, "low"))
 719                         iface->route_preference = -1;
 720                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 721                         iface->route_preference = 0;
 722                 else
 723                         goto err;
 724         }
 725
 726         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 727                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 728                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 729
 730         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 731                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 732                 goto err;
 733
 734         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 735                 iface->learn_routes = blobmsg_get_bool(c);
 736
 737         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 738                 iface->external = blobmsg_get_bool(c);
 739
 740         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 741                 const char *str = blobmsg_get_string(c);
 742                 char *astr = malloc(strlen(str) + 1);
 743                 char *delim;
 744                 int l;
 745
 746                 if (!astr || !strcpy(astr, str) ||
 747                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 748                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 749                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 750                         iface->pio_filter_length = 0;
 751                 else
 752                         iface->pio_filter_length = l;
 753
 754                 if (astr)
 755                         free(astr);
 756         }
 757
 758         return 0;
 759
 760 err:
 761         close_interface(iface);
 762         return -1;
 763 }
 764
 765 static int set_interface(struct uci_section *s)
 766 {
 767         blob_buf_init(&b, 0);
 768         uci_to_blob(&b, s, &interface_attr_list);
 769
 770         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 771 }
 772
 773 void odhcpd_reload(void)
 774 {
 775         struct uci_context *uci = uci_alloc_context();
 776
 777         while (!list_empty(&leases))
 778                 free_lease(list_first_entry(&leases, struct lease, head));
 779
 780         struct interface *master = NULL, *i, *n;
 781
 782         if (!uci)
 783                 return;
 784
 785         list_for_each_entry(i, &interfaces, head)
 786                 clean_interface(i);
 787
 788         struct uci_package *dhcp = NULL;
 789         if (!uci_load(uci, "dhcp", &dhcp)) {
 790                 struct uci_element *e;
 791                 uci_foreach_element(&dhcp->sections, e) {
 792                         struct uci_section *s = uci_to_section(e);
 793                         if (!strcmp(s->type, "host"))
 794                                 set_lease(s);
 795                         else if (!strcmp(s->type, "odhcpd"))
 796                                 set_config(s);
 797                 }
 798
 799                 uci_foreach_element(&dhcp->sections, e) {
 800                         struct uci_section *s = uci_to_section(e);
 801                         if (!strcmp(s->type, "dhcp"))
 802                                 set_interface(s);
 803                 }
 804         }
 805
 806         if (config.dhcp_statefile) {
 807                 char *path = strdup(config.dhcp_statefile);
 808
 809                 mkdir_p(dirname(path), 0755);
 810                 free(path);
 811         }
 812
 813 #ifdef WITH_UBUS
 814         ubus_apply_network();
 815 #endif
 816
 817         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 818
 819         /* Test for */
 820         list_for_each_entry(i, &interfaces, head) {
 821                 if (i->master)
 822                         continue;
 823
 824                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 825                         any_dhcpv6_slave = true;
 826
 827                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 828                         any_ra_slave = true;
 829
 830                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 831                         any_ndp_slave = true;
 832         }
 833
 834         /* Evaluate hybrid mode for master */
 835         list_for_each_entry(i, &interfaces, head) {
 836                 if (!i->master)
 837                         continue;
 838
 839                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 840 #ifdef WITH_UBUS
 841                 if (!ubus_has_prefix(i->name, i->ifname))
 842                         hybrid_mode = MODE_RELAY;
 843 #endif
 844
 845                 if (i->dhcpv6 == MODE_HYBRID)
 846                         i->dhcpv6 = hybrid_mode;
 847
 848                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 849                         i->dhcpv6 = MODE_DISABLED;
 850
 851                 if (i->ra == MODE_HYBRID)
 852                         i->ra = hybrid_mode;
 853
 854                 if (i->ra == MODE_RELAY && !any_ra_slave)
 855                         i->ra = MODE_DISABLED;
 856
 857                 if (i->ndp == MODE_HYBRID)
 858                         i->ndp = hybrid_mode;
 859
 860                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 861                         i->ndp = MODE_DISABLED;
 862
 863                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 864                         master = i;
 865         }
 866
 867
 868         list_for_each_entry_safe(i, n, &interfaces, head) {
 869                 if (i->inuse) {
 870                         /* Resolve hybrid mode */
 871                         if (i->dhcpv6 == MODE_HYBRID)
 872                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 873                                                 MODE_RELAY : MODE_SERVER;
 874
 875                         if (i->ra == MODE_HYBRID)
 876                                 i->ra = (master && master->ra == MODE_RELAY) ?
 877                                                 MODE_RELAY : MODE_SERVER;
 878
 879                         if (i->ndp == MODE_HYBRID)
 880                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 881                                                 MODE_RELAY : MODE_DISABLED;
 882
 883                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 884                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 885                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 886 #ifdef DHCPV4_SUPPORT
 887                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 888 #endif
 889                 } else
 890                         close_interface(i);
 891         }
 892
 893         uci_unload(uci, dhcp);
 894         uci_free_context(uci);
 895 }
 896
 897 static void handle_signal(int signal)
 898 {
 899         char b[1] = {0};
 900
 901         if (signal == SIGHUP) {
 902                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 903         } else
 904                 uloop_end();
 905 }
 906
 907 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 908 {
 909         char b[512];
 910         if (read(u->fd, b, sizeof(b)) < 0) {}
 911
 912         odhcpd_reload();
 913 }
 914
 915 static struct uloop_fd reload_fd = { .cb = reload_cb };
 916
 917 void odhcpd_run(void)
 918 {
 919         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 920
 921         reload_fd.fd = reload_pipe[0];
 922         uloop_fd_add(&reload_fd, ULOOP_READ);
 923
 924         signal(SIGTERM, handle_signal);
 925         signal(SIGINT, handle_signal);
 926         signal(SIGHUP, handle_signal);
 927
 928 #ifdef WITH_UBUS
 929         while (ubus_init())
 930                 sleep(1);
 931 #endif
 932
 933         odhcpd_reload();
 934         uloop_run();
 935
 936         while (!list_empty(&interfaces))
 937                 close_interface(list_first_entry(&interfaces, struct interface, head));
 938 }
 939