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