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 #include <libubox/avl.h>
  16 #include <libubox/avl-cmp.h>
  17 #include <libubox/list.h>
  18 #include <libubox/vlist.h>
  19
  20 #include "odhcpd.h"
  21
  22 static struct blob_buf b;
  23 static int reload_pipe[2] = { -1, -1 };
  24
  25 static int lease_cmp(const void *k1, const void *k2, void *ptr);
  26 static void lease_update(struct vlist_tree *tree, struct vlist_node *node_new,
  27                          struct vlist_node *node_old);
  28
  29 struct vlist_tree leases = VLIST_TREE_INIT(leases, lease_cmp, lease_update, true, false);
  30 AVL_TREE(interfaces, avl_strcmp, false, NULL);
  31 struct config config = {.legacy = false, .main_dhcpv4 = false,
  32                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  33                         .log_level = LOG_WARNING};
  34
  35 #define START_DEFAULT   100
  36 #define LIMIT_DEFAULT   150
  37
  38 enum {
  39         IFACE_ATTR_INTERFACE,
  40         IFACE_ATTR_IFNAME,
  41         IFACE_ATTR_NETWORKID,
  42         IFACE_ATTR_DYNAMICDHCP,
  43         IFACE_ATTR_LEASETIME,
  44         IFACE_ATTR_LIMIT,
  45         IFACE_ATTR_START,
  46         IFACE_ATTR_MASTER,
  47         IFACE_ATTR_UPSTREAM,
  48         IFACE_ATTR_RA,
  49         IFACE_ATTR_DHCPV4,
  50         IFACE_ATTR_DHCPV6,
  51         IFACE_ATTR_NDP,
  52         IFACE_ATTR_ROUTER,
  53         IFACE_ATTR_DNS,
  54         IFACE_ATTR_DOMAIN,
  55         IFACE_ATTR_FILTER_CLASS,
  56         IFACE_ATTR_DHCPV4_FORCERECONF,
  57         IFACE_ATTR_DHCPV6_RAW,
  58         IFACE_ATTR_DHCPV6_ASSIGNALL,
  59         IFACE_ATTR_DHCPV6_PD,
  60         IFACE_ATTR_DHCPV6_NA,
  61         IFACE_ATTR_RA_DEFAULT,
  62         IFACE_ATTR_RA_MANAGEMENT,
  63         IFACE_ATTR_RA_OFFLINK,
  64         IFACE_ATTR_RA_PREFERENCE,
  65         IFACE_ATTR_RA_ADVROUTER,
  66         IFACE_ATTR_RA_MININTERVAL,
  67         IFACE_ATTR_RA_MAXINTERVAL,
  68         IFACE_ATTR_RA_LIFETIME,
  69         IFACE_ATTR_RA_USELEASETIME,
  70         IFACE_ATTR_RA_REACHABLETIME,
  71         IFACE_ATTR_RA_RETRANSTIME,
  72         IFACE_ATTR_RA_HOPLIMIT,
  73         IFACE_ATTR_RA_MTU,
  74         IFACE_ATTR_RA_DNS,
  75         IFACE_ATTR_PD_MANAGER,
  76         IFACE_ATTR_PD_CER,
  77         IFACE_ATTR_NDPROXY_ROUTING,
  78         IFACE_ATTR_NDPROXY_SLAVE,
  79         IFACE_ATTR_PREFIX_FILTER,
  80         IFACE_ATTR_MAX
  81 };
  82
  83 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  84         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  88         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  92         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  93         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  96         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  98         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  99         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
 100         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 101         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 102         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 103         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 105         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 106         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 107         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 108         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 109         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 110         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 111         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 112         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 113         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 114         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 115         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 116         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 117         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 118         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 119         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 121         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 122         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 123         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 124         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 125 };
 126
 127 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 128         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 129         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 130         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 131 };
 132
 133 const struct uci_blob_param_list interface_attr_list = {
 134         .n_params = IFACE_ATTR_MAX,
 135         .params = iface_attrs,
 136         .info = iface_attr_info,
 137 };
 138
 139 enum {
 140         LEASE_ATTR_IP,
 141         LEASE_ATTR_MAC,
 142         LEASE_ATTR_DUID,
 143         LEASE_ATTR_HOSTID,
 144         LEASE_ATTR_LEASETIME,
 145         LEASE_ATTR_NAME,
 146         LEASE_ATTR_MAX
 147 };
 148
 149 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 150         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 151         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 152         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 153         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 154         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 155         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 156 };
 157
 158 const struct uci_blob_param_list lease_attr_list = {
 159         .n_params = LEASE_ATTR_MAX,
 160         .params = lease_attrs,
 161 };
 162
 163 enum {
 164         ODHCPD_ATTR_LEGACY,
 165         ODHCPD_ATTR_MAINDHCP,
 166         ODHCPD_ATTR_LEASEFILE,
 167         ODHCPD_ATTR_LEASETRIGGER,
 168         ODHCPD_ATTR_LOGLEVEL,
 169         ODHCPD_ATTR_MAX
 170 };
 171
 172 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 173         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 174         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 175         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 176         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 177         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 178 };
 179
 180 const struct uci_blob_param_list odhcpd_attr_list = {
 181         .n_params = ODHCPD_ATTR_MAX,
 182         .params = odhcpd_attrs,
 183 };
 184
 185 static int mkdir_p(char *dir, mode_t mask)
 186 {
 187         char *l = strrchr(dir, '/');
 188         int ret;
 189
 190         if (!l)
 191                 return 0;
 192
 193         *l = '\0';
 194
 195         if (mkdir_p(dir, mask))
 196                 return -1;
 197
 198         *l = '/';
 199
 200         ret = mkdir(dir, mask);
 201         if (ret && errno == EEXIST)
 202                 return 0;
 203
 204         if (ret)
 205                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 206
 207         return ret;
 208 }
 209
 210 static void set_interface_defaults(struct interface *iface)
 211 {
 212         iface->ignore = true;
 213         iface->dhcpv4 = MODE_DISABLED;
 214         iface->dhcpv6 = MODE_DISABLED;
 215         iface->ra = MODE_DISABLED;
 216         iface->ndp = MODE_DISABLED;
 217         iface->learn_routes = 1;
 218         iface->dhcpv4_leasetime = 43200;
 219         iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
 220         iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
 221         iface->dhcpv6_assignall = true;
 222         iface->dhcpv6_pd = true;
 223         iface->dhcpv6_na = true;
 224         iface->ra_managed = RA_MANAGED_MFLAG;
 225         iface->ra_maxinterval = 600;
 226         iface->ra_mininterval = iface->ra_maxinterval/3;
 227         iface->ra_lifetime = -1;
 228         iface->ra_dns = true;
 229 }
 230
 231 static void clean_interface(struct interface *iface)
 232 {
 233         free(iface->dns);
 234         free(iface->search);
 235         free(iface->upstream);
 236         free(iface->dhcpv4_router);
 237         free(iface->dhcpv4_dns);
 238         free(iface->dhcpv6_raw);
 239         free(iface->filter_class);
 240         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 241         set_interface_defaults(iface);
 242 }
 243
 244 static void close_interface(struct interface *iface)
 245 {
 246         avl_delete(&interfaces, &iface->avl);
 247
 248         router_setup_interface(iface, false);
 249         dhcpv6_setup_interface(iface, false);
 250         ndp_setup_interface(iface, false);
 251 #ifdef DHCPV4_SUPPORT
 252         dhcpv4_setup_interface(iface, false);
 253 #endif
 254
 255         clean_interface(iface);
 256         free(iface->addr4);
 257         free(iface->addr6);
 258         free(iface->ifname);
 259         free(iface);
 260 }
 261
 262 static int parse_mode(const char *mode)
 263 {
 264         if (!strcmp(mode, "disabled"))
 265                 return MODE_DISABLED;
 266         else if (!strcmp(mode, "server"))
 267                 return MODE_SERVER;
 268         else if (!strcmp(mode, "relay"))
 269                 return MODE_RELAY;
 270         else if (!strcmp(mode, "hybrid"))
 271                 return MODE_HYBRID;
 272         else
 273                 return -1;
 274 }
 275
 276 static void set_config(struct uci_section *s)
 277 {
 278         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 279
 280         blob_buf_init(&b, 0);
 281         uci_to_blob(&b, s, &odhcpd_attr_list);
 282         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 283
 284         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 285                 config.legacy = blobmsg_get_bool(c);
 286
 287         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 288                 config.main_dhcpv4 = blobmsg_get_bool(c);
 289
 290         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 291                 free(config.dhcp_statefile);
 292                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 293         }
 294
 295         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 296                 free(config.dhcp_cb);
 297                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 298         }
 299
 300         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 301                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 302
 303                 if (config.log_level != log_level) {
 304                         config.log_level = log_level;
 305                         setlogmask(LOG_UPTO(config.log_level));
 306                 }
 307         }
 308 }
 309
 310 static double parse_leasetime(struct blob_attr *c) {
 311         char *val = blobmsg_get_string(c), *endptr = NULL;
 312         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 313
 314         if (time && endptr && endptr[0]) {
 315                 if (endptr[0] == 's')
 316                         time *= 1;
 317                 else if (endptr[0] == 'm')
 318                         time *= 60;
 319                 else if (endptr[0] == 'h')
 320                         time *= 3600;
 321                 else if (endptr[0] == 'd')
 322                         time *= 24 * 3600;
 323                 else if (endptr[0] == 'w')
 324                         time *= 7 * 24 * 3600;
 325                 else
 326                         goto err;
 327         }
 328
 329         if (time < 60)
 330                 time = 60;
 331
 332         return time;
 333
 334 err:
 335         return -1;
 336 }
 337
 338 static void free_lease(struct lease *l)
 339 {
 340         free(l->hostname);
 341         free(l);
 342 }
 343
 344 static int set_lease(struct uci_section *s)
 345 {
 346         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 347         struct lease *l;
 348         size_t duidlen = 0;
 349         uint8_t *duid;
 350
 351         blob_buf_init(&b, 0);
 352         uci_to_blob(&b, s, &lease_attr_list);
 353         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 354
 355         if ((c = tb[LEASE_ATTR_DUID]))
 356                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 357
 358         l = calloc_a(sizeof(*l), &duid, duidlen);
 359         if (!l)
 360                 goto err;
 361
 362         if ((c = tb[LEASE_ATTR_MAC]))
 363                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 364                         goto err;
 365
 366         if ((c = tb[LEASE_ATTR_DUID])) {
 367                 ssize_t len;
 368
 369                 l->duid = duid;
 370                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 371
 372                 if (len < 0)
 373                         goto err;
 374
 375                 l->duid_len = len;
 376         }
 377
 378         if ((c = tb[LEASE_ATTR_NAME])) {
 379                 l->hostname = strdup(blobmsg_get_string(c));
 380                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 381                         goto err;
 382         }
 383
 384         if ((c = tb[LEASE_ATTR_IP]))
 385                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 386                         goto err;
 387
 388         if ((c = tb[LEASE_ATTR_HOSTID])) {
 389                 errno = 0;
 390                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 391                 if (errno)
 392                         goto err;
 393         } else {
 394                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 395                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 396         }
 397
 398         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 399                 double time = parse_leasetime(c);
 400                 if (time < 0)
 401                         goto err;
 402
 403                 l->leasetime = time;
 404         }
 405
 406         INIT_LIST_HEAD(&l->assignments);
 407         vlist_add(&leases, &l->node, l);
 408         return 0;
 409
 410 err:
 411         if (l)
 412                 free_lease(l);
 413
 414         return -1;
 415 }
 416
 417 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 418 {
 419         struct interface *iface;
 420         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 421         bool get_addrs = false;
 422
 423         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 424
 425         if (tb[IFACE_ATTR_INTERFACE])
 426                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 427
 428         if (!name)
 429                 return -1;
 430
 431         iface = avl_find_element(&interfaces, name, iface, avl);
 432         if (!iface) {
 433                 char *new_name;
 434
 435                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 436                 if (!iface)
 437                         return -1;
 438
 439                 iface->name = strcpy(new_name, name);
 440                 iface->avl.key = iface->name;
 441                 iface->router_event.uloop.fd = -1;
 442                 iface->dhcpv6_event.uloop.fd = -1;
 443                 iface->ndp_event.uloop.fd = -1;
 444                 iface->ndp_ping_fd = -1;
 445                 iface->dhcpv4_event.uloop.fd = -1;
 446                 INIT_LIST_HEAD(&iface->ia_assignments);
 447                 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
 448                 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
 449
 450                 set_interface_defaults(iface);
 451
 452                 avl_insert(&interfaces, &iface->avl);
 453                 get_addrs = overwrite = true;
 454         }
 455
 456         const char *ifname = NULL;
 457         if (overwrite) {
 458                 if ((c = tb[IFACE_ATTR_IFNAME]))
 459                         ifname = blobmsg_get_string(c);
 460                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 461                         ifname = blobmsg_get_string(c);
 462         }
 463
 464 #ifdef WITH_UBUS
 465         if (overwrite || !iface->ifname)
 466                 ifname = ubus_get_ifname(name);
 467 #endif
 468
 469         if (!iface->ifname && !ifname)
 470                 goto err;
 471
 472         if (ifname) {
 473                 free(iface->ifname);
 474                 iface->ifname = strdup(ifname);
 475
 476                 if (!iface->ifname)
 477                         goto err;
 478
 479                 if (!iface->ifindex &&
 480                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 481                         goto err;
 482         }
 483
 484         if (get_addrs) {
 485                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 486                                                 true, &iface->addr6);
 487
 488                 if (len > 0)
 489                         iface->addr6_len = len;
 490
 491                 len = netlink_get_interface_addrs(iface->ifindex,
 492                                                 false, &iface->addr4);
 493                 if (len > 0)
 494                         iface->addr4_len = len;
 495         }
 496
 497         iface->inuse = true;
 498
 499         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 500                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 501
 502         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 503                 double time = parse_leasetime(c);
 504                 if (time < 0)
 505                         goto err;
 506
 507                 iface->dhcpv4_leasetime = time;
 508         }
 509
 510         if ((c = tb[IFACE_ATTR_START])) {
 511                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 512                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 513                                                         LIMIT_DEFAULT - 1);
 514
 515                 if (config.main_dhcpv4 && config.legacy)
 516                         iface->dhcpv4 = MODE_SERVER;
 517         }
 518
 519         if ((c = tb[IFACE_ATTR_LIMIT]))
 520                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 521                                                         blobmsg_get_u32(c) - 1);
 522
 523         if ((c = tb[IFACE_ATTR_MASTER]))
 524                 iface->master = blobmsg_get_bool(c);
 525
 526         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 527                 struct blob_attr *cur;
 528                 unsigned rem;
 529
 530                 blobmsg_for_each_attr(cur, c, rem) {
 531                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 532                                 continue;
 533
 534                         iface->upstream = realloc(iface->upstream,
 535                                         iface->upstream_len + blobmsg_data_len(cur));
 536                         if (!iface->upstream)
 537                                 goto err;
 538
 539                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 540                         iface->upstream_len += blobmsg_data_len(cur);
 541                 }
 542         }
 543
 544         int mode;
 545         if ((c = tb[IFACE_ATTR_RA])) {
 546                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 547                         iface->ra = mode;
 548
 549                         if (iface->ra != MODE_DISABLED)
 550                                 iface->ignore = false;
 551                 } else
 552                         goto err;
 553         }
 554
 555         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 556                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 557                         if (config.main_dhcpv4) {
 558                                 iface->dhcpv4 = mode;
 559
 560                                 if (iface->dhcpv4 != MODE_DISABLED)
 561                                         iface->ignore = false;
 562                         }
 563                 }
 564                 else
 565                         goto err;
 566         }
 567
 568         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 569                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 570                         iface->dhcpv6 = mode;
 571
 572                         if (iface->dhcpv6 != MODE_DISABLED)
 573                                 iface->ignore = false;
 574                 } else
 575                         goto err;
 576         }
 577
 578         if ((c = tb[IFACE_ATTR_NDP])) {
 579                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 580                         iface->ndp = mode;
 581
 582                         if (iface->ndp != MODE_DISABLED)
 583                                 iface->ignore = false;
 584                 } else
 585                         goto err;
 586         }
 587
 588         if ((c = tb[IFACE_ATTR_ROUTER])) {
 589                 struct blob_attr *cur;
 590                 unsigned rem;
 591
 592                 blobmsg_for_each_attr(cur, c, rem) {
 593                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 594                                 continue;
 595
 596                         struct in_addr addr4;
 597                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 598                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 599                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 600                                 if (!iface->dhcpv4_router)
 601                                         goto err;
 602
 603                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 604                         } else
 605                                 goto err;
 606                 }
 607         }
 608
 609         if ((c = tb[IFACE_ATTR_DNS])) {
 610                 struct blob_attr *cur;
 611                 unsigned rem;
 612
 613                 iface->always_rewrite_dns = true;
 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                         struct in_addr addr4;
 619                         struct in6_addr addr6;
 620                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 621                                 if (addr4.s_addr == INADDR_ANY)
 622                                         goto err;
 623
 624                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 625                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 626                                 if (!iface->dhcpv4_dns)
 627                                         goto err;
 628
 629                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 630                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 631                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 632                                         goto err;
 633
 634                                 iface->dns = realloc(iface->dns,
 635                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 636                                 if (!iface->dns)
 637                                         goto err;
 638
 639                                 iface->dns[iface->dns_cnt - 1] = addr6;
 640                         } else
 641                                 goto err;
 642                 }
 643         }
 644
 645         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 646                 struct blob_attr *cur;
 647                 unsigned rem;
 648
 649                 blobmsg_for_each_attr(cur, c, rem) {
 650                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 651                                 continue;
 652
 653                         uint8_t buf[256];
 654                         char *domain = blobmsg_get_string(cur);
 655                         size_t domainlen = strlen(domain);
 656                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 657                                 domain[domainlen - 1] = 0;
 658
 659                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 660                         if (len <= 0)
 661                                 goto err;
 662
 663                         iface->search = realloc(iface->search, iface->search_len + len);
 664                         if (!iface->search)
 665                                 goto err;
 666
 667                         memcpy(&iface->search[iface->search_len], buf, len);
 668                         iface->search_len += len;
 669                 }
 670         }
 671
 672         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 673                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 674                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 675         }
 676
 677         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 678                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 679
 680         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 681                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 682                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 683                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 684         }
 685
 686         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 687                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 688
 689         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 690                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 691
 692         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 693                 iface->dhcpv6_na = blobmsg_get_bool(c);
 694
 695         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 696                 iface->default_router = blobmsg_get_u32(c);
 697
 698         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 699                 iface->ra_managed = blobmsg_get_u32(c);
 700
 701         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 702                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 703                 if (ra_reachabletime > 3600000)
 704                         goto err;
 705
 706                 iface->ra_reachabletime = ra_reachabletime;
 707         }
 708
 709         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 710                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 711                 if (ra_retranstime > 60000)
 712                         goto err;
 713
 714                 iface->ra_retranstime = ra_retranstime;
 715         }
 716
 717         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 718                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 719                 if (ra_hoplimit > 255)
 720                         goto err;
 721
 722                 iface->ra_hoplimit = ra_hoplimit;
 723         }
 724
 725         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 726                 uint32_t ra_mtu = blobmsg_get_u32(c);
 727                 if (ra_mtu < 1280 || ra_mtu > 65535)
 728                         goto err;
 729
 730                 iface->ra_mtu = ra_mtu;
 731         }
 732
 733         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 734                 iface->ra_not_onlink = blobmsg_get_bool(c);
 735
 736         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 737                 iface->ra_advrouter = blobmsg_get_bool(c);
 738
 739         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 740                 iface->ra_mininterval =  blobmsg_get_u32(c);
 741
 742         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 743                 iface->ra_maxinterval = blobmsg_get_u32(c);
 744
 745         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 746                 iface->ra_lifetime = blobmsg_get_u32(c);
 747
 748         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 749                 iface->ra_useleasetime = blobmsg_get_bool(c);
 750
 751         if ((c = tb[IFACE_ATTR_RA_DNS]))
 752                 iface->ra_dns = blobmsg_get_bool(c);
 753
 754         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 755                 const char *prio = blobmsg_get_string(c);
 756
 757                 if (!strcmp(prio, "high"))
 758                         iface->route_preference = 1;
 759                 else if (!strcmp(prio, "low"))
 760                         iface->route_preference = -1;
 761                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 762                         iface->route_preference = 0;
 763                 else
 764                         goto err;
 765         }
 766
 767         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 768                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 769                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 770
 771         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 772                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 773                 goto err;
 774
 775         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 776                 iface->learn_routes = blobmsg_get_bool(c);
 777
 778         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 779                 iface->external = blobmsg_get_bool(c);
 780
 781         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 782                 const char *str = blobmsg_get_string(c);
 783                 char *astr = malloc(strlen(str) + 1);
 784                 char *delim;
 785                 int l;
 786
 787                 if (!astr || !strcpy(astr, str) ||
 788                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 789                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 790                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 791                         iface->pio_filter_length = 0;
 792                 else
 793                         iface->pio_filter_length = l;
 794
 795                 if (astr)
 796                         free(astr);
 797         }
 798
 799         return 0;
 800
 801 err:
 802         close_interface(iface);
 803         return -1;
 804 }
 805
 806 static int set_interface(struct uci_section *s)
 807 {
 808         blob_buf_init(&b, 0);
 809         uci_to_blob(&b, s, &interface_attr_list);
 810
 811         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 812 }
 813
 814 static void lease_delete_assignments(struct lease *l, bool v6)
 815 {
 816         struct dhcp_assignment *a, *tmp;
 817         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 818
 819         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 820                 if (a->flags & flag)
 821                         free_assignment(a);
 822         }
 823 }
 824
 825 static void lease_update_assignments(struct lease *l)
 826 {
 827         struct dhcp_assignment *a;
 828
 829         list_for_each_entry(a, &l->assignments, lease_list) {
 830                 if (a->hostname)
 831                         free(a->hostname);
 832                 a->hostname = NULL;
 833
 834                 if (l->hostname)
 835                         a->hostname = strdup(l->hostname);
 836
 837                 a->leasetime = l->leasetime;
 838         }
 839 }
 840
 841 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 842 {
 843         const struct lease *l1 = k1, *l2 = k2;
 844         int cmp = 0;
 845
 846         if (l1->duid_len != l2->duid_len)
 847                 return l1->duid_len - l2->duid_len;
 848
 849         if (l1->duid_len && l2->duid_len)
 850                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 851
 852         if (cmp)
 853                 return cmp;
 854
 855         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 856                       sizeof(l1->mac.ether_addr_octet));
 857 }
 858
 859 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 860 {
 861         bool update = false;
 862
 863         if ((!!l_new->hostname != !!l_old->hostname) ||
 864             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 865                 free(l_old->hostname);
 866                 l_old->hostname = NULL;
 867
 868                 if (l_new->hostname)
 869                         l_old->hostname = strdup(l_new->hostname);
 870
 871                 update = true;
 872         }
 873
 874         if (l_old->leasetime != l_new->leasetime) {
 875                 l_old->leasetime = l_new->leasetime;
 876                 update = true;
 877         }
 878
 879         if (l_old->ipaddr != l_new->ipaddr) {
 880                 l_old->ipaddr = l_new->ipaddr;
 881                 lease_delete_assignments(l_old, false);
 882         }
 883
 884         if (l_old->hostid != l_new->hostid) {
 885                 l_old->hostid = l_new->hostid;
 886                 lease_delete_assignments(l_old, true);
 887         }
 888
 889         if (update)
 890                 lease_update_assignments(l_old);
 891
 892         free_lease(l_new);
 893 }
 894
 895 static void lease_delete(struct lease *l)
 896 {
 897         struct dhcp_assignment *a, *tmp;
 898
 899         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
 900                 free_assignment(a);
 901
 902         free_lease(l);
 903 }
 904
 905 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 906                          struct vlist_node *node_old)
 907 {
 908         struct lease *lease_new = container_of(node_new, struct lease, node);
 909         struct lease *lease_old = container_of(node_old, struct lease, node);
 910
 911         if (node_old && node_new)
 912                 lease_change_config(lease_old, lease_new);
 913         else if (node_old)
 914                 lease_delete(lease_old);
 915 }
 916
 917 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 918 {
 919         struct lease *l;
 920
 921         vlist_for_each_element(&leases, l, node) {
 922                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 923                         return l;
 924         }
 925
 926         return NULL;
 927 }
 928
 929 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 930 {
 931         struct lease *l;
 932
 933         vlist_for_each_element(&leases, l, node) {
 934                 if (!memcmp(l->mac.ether_addr_octet, mac,
 935                             sizeof(l->mac.ether_addr_octet)))
 936                         return l;
 937         }
 938
 939         return NULL;
 940 }
 941
 942 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
 943 {
 944         struct lease *l;
 945
 946         vlist_for_each_element(&leases, l, node) {
 947                 if (l->hostid == hostid)
 948                         return l;
 949         }
 950
 951         return NULL;
 952 }
 953
 954 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
 955 {
 956         struct lease *l;
 957
 958         vlist_for_each_element(&leases, l, node) {
 959                 if (l->ipaddr == ipaddr)
 960                         return l;
 961         }
 962
 963         return NULL;
 964 }
 965
 966 void odhcpd_reload(void)
 967 {
 968         struct uci_context *uci = uci_alloc_context();
 969         struct interface *master = NULL, *i, *tmp;
 970
 971         if (!uci)
 972                 return;
 973
 974         vlist_update(&leases);
 975         avl_for_each_element(&interfaces, i, avl)
 976                 clean_interface(i);
 977
 978         struct uci_package *dhcp = NULL;
 979         if (!uci_load(uci, "dhcp", &dhcp)) {
 980                 struct uci_element *e;
 981
 982                 /* 1. Global settings */
 983                 uci_foreach_element(&dhcp->sections, e) {
 984                         struct uci_section *s = uci_to_section(e);
 985                         if (!strcmp(s->type, "odhcpd"))
 986                                 set_config(s);
 987                 }
 988
 989                 /* 2. DHCP pools */
 990                 uci_foreach_element(&dhcp->sections, e) {
 991                         struct uci_section *s = uci_to_section(e);
 992                         if (!strcmp(s->type, "dhcp"))
 993                                 set_interface(s);
 994                 }
 995
 996                 /* 3. Static leases */
 997                 uci_foreach_element(&dhcp->sections, e) {
 998                         struct uci_section* s = uci_to_section(e);
 999                         if (!strcmp(s->type, "host"))
1000                                 set_lease(s);
1001                 }
1002         }
1003
1004         if (config.dhcp_statefile) {
1005                 char *path = strdup(config.dhcp_statefile);
1006
1007                 mkdir_p(dirname(path), 0755);
1008                 free(path);
1009         }
1010
1011         vlist_flush(&leases);
1012
1013 #ifdef WITH_UBUS
1014         ubus_apply_network();
1015 #endif
1016
1017         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1018
1019         /* Test for */
1020         avl_for_each_element(&interfaces, i, avl) {
1021                 if (i->master)
1022                         continue;
1023
1024                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1025                         any_dhcpv6_slave = true;
1026
1027                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1028                         any_ra_slave = true;
1029
1030                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1031                         any_ndp_slave = true;
1032         }
1033
1034         /* Evaluate hybrid mode for master */
1035         avl_for_each_element(&interfaces, i, avl) {
1036                 if (!i->master)
1037                         continue;
1038
1039                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1040 #ifdef WITH_UBUS
1041                 if (!ubus_has_prefix(i->name, i->ifname))
1042                         hybrid_mode = MODE_RELAY;
1043 #endif
1044
1045                 if (i->dhcpv6 == MODE_HYBRID)
1046                         i->dhcpv6 = hybrid_mode;
1047
1048                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1049                         i->dhcpv6 = MODE_DISABLED;
1050
1051                 if (i->ra == MODE_HYBRID)
1052                         i->ra = hybrid_mode;
1053
1054                 if (i->ra == MODE_RELAY && !any_ra_slave)
1055                         i->ra = MODE_DISABLED;
1056
1057                 if (i->ndp == MODE_HYBRID)
1058                         i->ndp = hybrid_mode;
1059
1060                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1061                         i->ndp = MODE_DISABLED;
1062
1063                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1064                         master = i;
1065         }
1066
1067
1068         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1069                 if (i->inuse) {
1070                         /* Resolve hybrid mode */
1071                         if (i->dhcpv6 == MODE_HYBRID)
1072                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1073                                                 MODE_RELAY : MODE_SERVER;
1074
1075                         if (i->ra == MODE_HYBRID)
1076                                 i->ra = (master && master->ra == MODE_RELAY) ?
1077                                                 MODE_RELAY : MODE_SERVER;
1078
1079                         if (i->ndp == MODE_HYBRID)
1080                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1081                                                 MODE_RELAY : MODE_DISABLED;
1082
1083                         router_setup_interface(i, i->ra != MODE_DISABLED);
1084                         dhcpv6_setup_interface(i, i->dhcpv6 != MODE_DISABLED);
1085                         ndp_setup_interface(i, i->ndp != MODE_DISABLED);
1086 #ifdef DHCPV4_SUPPORT
1087                         dhcpv4_setup_interface(i, i->dhcpv4 != MODE_DISABLED);
1088 #endif
1089                 } else
1090                         close_interface(i);
1091         }
1092
1093         uci_unload(uci, dhcp);
1094         uci_free_context(uci);
1095 }
1096
1097 static void handle_signal(int signal)
1098 {
1099         char b[1] = {0};
1100
1101         if (signal == SIGHUP) {
1102                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1103         } else
1104                 uloop_end();
1105 }
1106
1107 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1108 {
1109         char b[512];
1110         if (read(u->fd, b, sizeof(b)) < 0) {}
1111
1112         odhcpd_reload();
1113 }
1114
1115 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1116
1117 void odhcpd_run(void)
1118 {
1119         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1120
1121         reload_fd.fd = reload_pipe[0];
1122         uloop_fd_add(&reload_fd, ULOOP_READ);
1123
1124         signal(SIGTERM, handle_signal);
1125         signal(SIGINT, handle_signal);
1126         signal(SIGHUP, handle_signal);
1127
1128 #ifdef WITH_UBUS
1129         while (ubus_init())
1130                 sleep(1);
1131 #endif
1132
1133         odhcpd_reload();
1134         uloop_run();
1135 }