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_IGNORE,
  44         IFACE_ATTR_LEASETIME,
  45         IFACE_ATTR_LIMIT,
  46         IFACE_ATTR_START,
  47         IFACE_ATTR_MASTER,
  48         IFACE_ATTR_UPSTREAM,
  49         IFACE_ATTR_RA,
  50         IFACE_ATTR_DHCPV4,
  51         IFACE_ATTR_DHCPV6,
  52         IFACE_ATTR_NDP,
  53         IFACE_ATTR_ROUTER,
  54         IFACE_ATTR_DNS,
  55         IFACE_ATTR_DOMAIN,
  56         IFACE_ATTR_FILTER_CLASS,
  57         IFACE_ATTR_DHCPV4_FORCERECONF,
  58         IFACE_ATTR_DHCPV6_RAW,
  59         IFACE_ATTR_DHCPV6_ASSIGNALL,
  60         IFACE_ATTR_DHCPV6_PD,
  61         IFACE_ATTR_DHCPV6_NA,
  62         IFACE_ATTR_RA_DEFAULT,
  63         IFACE_ATTR_RA_MANAGEMENT,
  64         IFACE_ATTR_RA_OFFLINK,
  65         IFACE_ATTR_RA_PREFERENCE,
  66         IFACE_ATTR_RA_ADVROUTER,
  67         IFACE_ATTR_RA_MININTERVAL,
  68         IFACE_ATTR_RA_MAXINTERVAL,
  69         IFACE_ATTR_RA_LIFETIME,
  70         IFACE_ATTR_RA_USELEASETIME,
  71         IFACE_ATTR_RA_REACHABLETIME,
  72         IFACE_ATTR_RA_RETRANSTIME,
  73         IFACE_ATTR_RA_HOPLIMIT,
  74         IFACE_ATTR_RA_MTU,
  75         IFACE_ATTR_RA_DNS,
  76         IFACE_ATTR_PD_MANAGER,
  77         IFACE_ATTR_PD_CER,
  78         IFACE_ATTR_NDPROXY_ROUTING,
  79         IFACE_ATTR_NDPROXY_SLAVE,
  80         IFACE_ATTR_PREFIX_FILTER,
  81         IFACE_ATTR_MAX
  82 };
  83
  84 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  85         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  86         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  87         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  90         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  91         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  93         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  95         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  96         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
 100         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 101         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
 102         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 103         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 105         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 106         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 107         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 108         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 109         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 110         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 111         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 112         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 113         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 114         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 115         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 116         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 117         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 118         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 119         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 121         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 122         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 123         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 124         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 125         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 126         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 127 };
 128
 129 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 130         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 131         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 132         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 133 };
 134
 135 const struct uci_blob_param_list interface_attr_list = {
 136         .n_params = IFACE_ATTR_MAX,
 137         .params = iface_attrs,
 138         .info = iface_attr_info,
 139 };
 140
 141 enum {
 142         LEASE_ATTR_IP,
 143         LEASE_ATTR_MAC,
 144         LEASE_ATTR_DUID,
 145         LEASE_ATTR_HOSTID,
 146         LEASE_ATTR_LEASETIME,
 147         LEASE_ATTR_NAME,
 148         LEASE_ATTR_MAX
 149 };
 150
 151 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 152         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 153         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 154         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 155         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 156         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 157         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 158 };
 159
 160 const struct uci_blob_param_list lease_attr_list = {
 161         .n_params = LEASE_ATTR_MAX,
 162         .params = lease_attrs,
 163 };
 164
 165 enum {
 166         ODHCPD_ATTR_LEGACY,
 167         ODHCPD_ATTR_MAINDHCP,
 168         ODHCPD_ATTR_LEASEFILE,
 169         ODHCPD_ATTR_LEASETRIGGER,
 170         ODHCPD_ATTR_LOGLEVEL,
 171         ODHCPD_ATTR_MAX
 172 };
 173
 174 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 175         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 176         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 177         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 178         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 179         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 180 };
 181
 182 const struct uci_blob_param_list odhcpd_attr_list = {
 183         .n_params = ODHCPD_ATTR_MAX,
 184         .params = odhcpd_attrs,
 185 };
 186
 187 static int mkdir_p(char *dir, mode_t mask)
 188 {
 189         char *l = strrchr(dir, '/');
 190         int ret;
 191
 192         if (!l)
 193                 return 0;
 194
 195         *l = '\0';
 196
 197         if (mkdir_p(dir, mask))
 198                 return -1;
 199
 200         *l = '/';
 201
 202         ret = mkdir(dir, mask);
 203         if (ret && errno == EEXIST)
 204                 return 0;
 205
 206         if (ret)
 207                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 208
 209         return ret;
 210 }
 211
 212 static void set_interface_defaults(struct interface *iface)
 213 {
 214         iface->learn_routes = 1;
 215         iface->dhcpv4_leasetime = 43200;
 216         iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
 217         iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
 218         iface->dhcpv6_assignall = true;
 219         iface->dhcpv6_pd = true;
 220         iface->dhcpv6_na = true;
 221         iface->ra_managed = RA_MANAGED_MFLAG;
 222         iface->ra_maxinterval = 600;
 223         iface->ra_mininterval = iface->ra_maxinterval/3;
 224         iface->ra_lifetime = -1;
 225         iface->ra_dns = true;
 226 }
 227
 228 static void clean_interface(struct interface *iface)
 229 {
 230         free(iface->dns);
 231         free(iface->search);
 232         free(iface->upstream);
 233         free(iface->dhcpv4_router);
 234         free(iface->dhcpv4_dns);
 235         free(iface->dhcpv6_raw);
 236         free(iface->filter_class);
 237         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 238         set_interface_defaults(iface);
 239 }
 240
 241 static void close_interface(struct interface *iface)
 242 {
 243         avl_delete(&interfaces, &iface->avl);
 244
 245         router_setup_interface(iface, false);
 246         dhcpv6_setup_interface(iface, false);
 247         ndp_setup_interface(iface, false);
 248 #ifdef DHCPV4_SUPPORT
 249         dhcpv4_setup_interface(iface, false);
 250 #endif
 251
 252         clean_interface(iface);
 253         free(iface->addr4);
 254         free(iface->addr6);
 255         free(iface->ifname);
 256         free(iface);
 257 }
 258
 259 static int parse_mode(const char *mode)
 260 {
 261         if (!strcmp(mode, "disabled"))
 262                 return MODE_DISABLED;
 263         else if (!strcmp(mode, "server"))
 264                 return MODE_SERVER;
 265         else if (!strcmp(mode, "relay"))
 266                 return MODE_RELAY;
 267         else if (!strcmp(mode, "hybrid"))
 268                 return MODE_HYBRID;
 269         else
 270                 return -1;
 271 }
 272
 273 static void set_config(struct uci_section *s)
 274 {
 275         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 276
 277         blob_buf_init(&b, 0);
 278         uci_to_blob(&b, s, &odhcpd_attr_list);
 279         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 280
 281         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 282                 config.legacy = blobmsg_get_bool(c);
 283
 284         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 285                 config.main_dhcpv4 = blobmsg_get_bool(c);
 286
 287         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 288                 free(config.dhcp_statefile);
 289                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 290         }
 291
 292         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 293                 free(config.dhcp_cb);
 294                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 295         }
 296
 297         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 298                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 299
 300                 if (config.log_level != log_level) {
 301                         config.log_level = log_level;
 302                         setlogmask(LOG_UPTO(config.log_level));
 303                 }
 304         }
 305 }
 306
 307 static double parse_leasetime(struct blob_attr *c) {
 308         char *val = blobmsg_get_string(c), *endptr = NULL;
 309         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 310
 311         if (time && endptr && endptr[0]) {
 312                 if (endptr[0] == 's')
 313                         time *= 1;
 314                 else if (endptr[0] == 'm')
 315                         time *= 60;
 316                 else if (endptr[0] == 'h')
 317                         time *= 3600;
 318                 else if (endptr[0] == 'd')
 319                         time *= 24 * 3600;
 320                 else if (endptr[0] == 'w')
 321                         time *= 7 * 24 * 3600;
 322                 else
 323                         goto err;
 324         }
 325
 326         if (time < 60)
 327                 time = 60;
 328
 329         return time;
 330
 331 err:
 332         return -1;
 333 }
 334
 335 static void free_lease(struct lease *l)
 336 {
 337         free(l->hostname);
 338         free(l);
 339 }
 340
 341 static int set_lease(struct uci_section *s)
 342 {
 343         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 344         struct lease *l;
 345         size_t duidlen = 0;
 346         uint8_t *duid;
 347
 348         blob_buf_init(&b, 0);
 349         uci_to_blob(&b, s, &lease_attr_list);
 350         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 351
 352         if ((c = tb[LEASE_ATTR_DUID]))
 353                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 354
 355         l = calloc_a(sizeof(*l), &duid, duidlen);
 356         if (!l)
 357                 goto err;
 358
 359         if ((c = tb[LEASE_ATTR_MAC]))
 360                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 361                         goto err;
 362
 363         if ((c = tb[LEASE_ATTR_DUID])) {
 364                 ssize_t len;
 365
 366                 l->duid = duid;
 367                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 368
 369                 if (len < 0)
 370                         goto err;
 371
 372                 l->duid_len = len;
 373         }
 374
 375         if ((c = tb[LEASE_ATTR_NAME])) {
 376                 l->hostname = strdup(blobmsg_get_string(c));
 377                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 378                         goto err;
 379         }
 380
 381         if ((c = tb[LEASE_ATTR_IP]))
 382                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 383                         goto err;
 384
 385         if ((c = tb[LEASE_ATTR_HOSTID])) {
 386                 errno = 0;
 387                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 388                 if (errno)
 389                         goto err;
 390         } else {
 391                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 392                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 393         }
 394
 395         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 396                 double time = parse_leasetime(c);
 397                 if (time < 0)
 398                         goto err;
 399
 400                 l->leasetime = time;
 401         }
 402
 403         INIT_LIST_HEAD(&l->assignments);
 404         vlist_add(&leases, &l->node, l);
 405         return 0;
 406
 407 err:
 408         if (l)
 409                 free_lease(l);
 410
 411         return -1;
 412 }
 413
 414 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 415 {
 416         struct interface *iface;
 417         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 418         bool get_addrs = false;
 419
 420         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 421
 422         if (tb[IFACE_ATTR_INTERFACE])
 423                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 424
 425         if (!name)
 426                 return -1;
 427
 428         iface = avl_find_element(&interfaces, name, iface, avl);
 429         if (!iface) {
 430                 char *new_name;
 431
 432                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 433                 if (!iface)
 434                         return -1;
 435
 436                 iface->name = strcpy(new_name, name);
 437                 iface->avl.key = iface->name;
 438                 iface->router_event.uloop.fd = -1;
 439                 iface->dhcpv6_event.uloop.fd = -1;
 440                 iface->ndp_event.uloop.fd = -1;
 441                 iface->ndp_ping_fd = -1;
 442                 iface->dhcpv4_event.uloop.fd = -1;
 443                 INIT_LIST_HEAD(&iface->ia_assignments);
 444                 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
 445                 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
 446
 447                 set_interface_defaults(iface);
 448
 449                 avl_insert(&interfaces, &iface->avl);
 450                 get_addrs = overwrite = true;
 451         }
 452
 453         const char *ifname = NULL;
 454         if (overwrite) {
 455                 if ((c = tb[IFACE_ATTR_IFNAME]))
 456                         ifname = blobmsg_get_string(c);
 457                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 458                         ifname = blobmsg_get_string(c);
 459         }
 460
 461 #ifdef WITH_UBUS
 462         if (overwrite || !iface->ifname)
 463                 ifname = ubus_get_ifname(name);
 464 #endif
 465
 466         if (!iface->ifname && !ifname)
 467                 goto err;
 468
 469         if (ifname) {
 470                 free(iface->ifname);
 471                 iface->ifname = strdup(ifname);
 472
 473                 if (!iface->ifname)
 474                         goto err;
 475
 476                 if (!iface->ifindex &&
 477                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 478                         goto err;
 479         }
 480
 481         if (get_addrs) {
 482                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 483                                                 true, &iface->addr6);
 484
 485                 if (len > 0)
 486                         iface->addr6_len = len;
 487
 488                 len = netlink_get_interface_addrs(iface->ifindex,
 489                                                 false, &iface->addr4);
 490                 if (len > 0)
 491                         iface->addr4_len = len;
 492         }
 493
 494         iface->inuse = true;
 495
 496         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 497                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 498
 499         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 500                 iface->ignore = 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                 else
 549                         goto err;
 550         }
 551
 552         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 553                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 554                         if (config.main_dhcpv4)
 555                                 iface->dhcpv4 = mode;
 556                 }
 557                 else
 558                         goto err;
 559         }
 560
 561         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 562                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 563                         iface->dhcpv6 = mode;
 564                 else
 565                         goto err;
 566         }
 567
 568         if ((c = tb[IFACE_ATTR_NDP])) {
 569                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 570                         iface->ndp = mode;
 571                 else
 572                         goto err;
 573         }
 574
 575         if ((c = tb[IFACE_ATTR_ROUTER])) {
 576                 struct blob_attr *cur;
 577                 unsigned rem;
 578
 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                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 585                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 586                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 587                                 if (!iface->dhcpv4_router)
 588                                         goto err;
 589
 590                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 591                         } else
 592                                 goto err;
 593                 }
 594         }
 595
 596         if ((c = tb[IFACE_ATTR_DNS])) {
 597                 struct blob_attr *cur;
 598                 unsigned rem;
 599
 600                 iface->always_rewrite_dns = true;
 601                 blobmsg_for_each_attr(cur, c, rem) {
 602                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 603                                 continue;
 604
 605                         struct in_addr addr4;
 606                         struct in6_addr addr6;
 607                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 608                                 if (addr4.s_addr == INADDR_ANY)
 609                                         goto err;
 610
 611                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 612                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 613                                 if (!iface->dhcpv4_dns)
 614                                         goto err;
 615
 616                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 617                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 618                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 619                                         goto err;
 620
 621                                 iface->dns = realloc(iface->dns,
 622                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 623                                 if (!iface->dns)
 624                                         goto err;
 625
 626                                 iface->dns[iface->dns_cnt - 1] = addr6;
 627                         } else
 628                                 goto err;
 629                 }
 630         }
 631
 632         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 633                 struct blob_attr *cur;
 634                 unsigned rem;
 635
 636                 blobmsg_for_each_attr(cur, c, rem) {
 637                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 638                                 continue;
 639
 640                         uint8_t buf[256];
 641                         char *domain = blobmsg_get_string(cur);
 642                         size_t domainlen = strlen(domain);
 643                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 644                                 domain[domainlen - 1] = 0;
 645
 646                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 647                         if (len <= 0)
 648                                 goto err;
 649
 650                         iface->search = realloc(iface->search, iface->search_len + len);
 651                         if (!iface->search)
 652                                 goto err;
 653
 654                         memcpy(&iface->search[iface->search_len], buf, len);
 655                         iface->search_len += len;
 656                 }
 657         }
 658
 659         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 660                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 661                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 662         }
 663
 664         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 665                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 666
 667         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 668                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 669                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 670                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 671         }
 672
 673         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 674                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 675
 676         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 677                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 678
 679         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 680                 iface->dhcpv6_na = blobmsg_get_bool(c);
 681
 682         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 683                 iface->default_router = blobmsg_get_u32(c);
 684
 685         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 686                 iface->ra_managed = blobmsg_get_u32(c);
 687
 688         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 689                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 690                 if (ra_reachabletime > 3600000)
 691                         goto err;
 692
 693                 iface->ra_reachabletime = ra_reachabletime;
 694         }
 695
 696         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 697                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 698                 if (ra_retranstime > 60000)
 699                         goto err;
 700
 701                 iface->ra_retranstime = ra_retranstime;
 702         }
 703
 704         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 705                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 706                 if (ra_hoplimit > 255)
 707                         goto err;
 708
 709                 iface->ra_hoplimit = ra_hoplimit;
 710         }
 711
 712         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 713                 uint32_t ra_mtu = blobmsg_get_u32(c);
 714                 if (ra_mtu < 1280 || ra_mtu > 65535)
 715                         goto err;
 716
 717                 iface->ra_mtu = ra_mtu;
 718         }
 719
 720         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 721                 iface->ra_not_onlink = blobmsg_get_bool(c);
 722
 723         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 724                 iface->ra_advrouter = blobmsg_get_bool(c);
 725
 726         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 727                 iface->ra_mininterval =  blobmsg_get_u32(c);
 728
 729         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 730                 iface->ra_maxinterval = blobmsg_get_u32(c);
 731
 732         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 733                 iface->ra_lifetime = blobmsg_get_u32(c);
 734
 735         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 736                 iface->ra_useleasetime = blobmsg_get_bool(c);
 737
 738         if ((c = tb[IFACE_ATTR_RA_DNS]))
 739                 iface->ra_dns = blobmsg_get_bool(c);
 740
 741         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 742                 const char *prio = blobmsg_get_string(c);
 743
 744                 if (!strcmp(prio, "high"))
 745                         iface->route_preference = 1;
 746                 else if (!strcmp(prio, "low"))
 747                         iface->route_preference = -1;
 748                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 749                         iface->route_preference = 0;
 750                 else
 751                         goto err;
 752         }
 753
 754         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 755                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 756                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 757
 758         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 759                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 760                 goto err;
 761
 762         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 763                 iface->learn_routes = blobmsg_get_bool(c);
 764
 765         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 766                 iface->external = blobmsg_get_bool(c);
 767
 768         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 769                 const char *str = blobmsg_get_string(c);
 770                 char *astr = malloc(strlen(str) + 1);
 771                 char *delim;
 772                 int l;
 773
 774                 if (!astr || !strcpy(astr, str) ||
 775                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 776                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 777                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 778                         iface->pio_filter_length = 0;
 779                 else
 780                         iface->pio_filter_length = l;
 781
 782                 if (astr)
 783                         free(astr);
 784         }
 785
 786         return 0;
 787
 788 err:
 789         close_interface(iface);
 790         return -1;
 791 }
 792
 793 static int set_interface(struct uci_section *s)
 794 {
 795         blob_buf_init(&b, 0);
 796         uci_to_blob(&b, s, &interface_attr_list);
 797
 798         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 799 }
 800
 801 static void lease_delete_assignments(struct lease *l, bool v6)
 802 {
 803         struct dhcp_assignment *a, *tmp;
 804         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 805
 806         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 807                 if (a->flags & flag)
 808                         free_assignment(a);
 809         }
 810 }
 811
 812 static void lease_update_assignments(struct lease *l)
 813 {
 814         struct dhcp_assignment *a;
 815
 816         list_for_each_entry(a, &l->assignments, lease_list) {
 817                 if (a->hostname)
 818                         free(a->hostname);
 819                 a->hostname = NULL;
 820
 821                 if (l->hostname)
 822                         a->hostname = strdup(l->hostname);
 823
 824                 a->leasetime = l->leasetime;
 825         }
 826 }
 827
 828 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 829 {
 830         const struct lease *l1 = k1, *l2 = k2;
 831         int cmp = 0;
 832
 833         if (l1->duid_len != l2->duid_len)
 834                 return l1->duid_len - l2->duid_len;
 835
 836         if (l1->duid_len && l2->duid_len)
 837                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 838
 839         if (cmp)
 840                 return cmp;
 841
 842         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 843                       sizeof(l1->mac.ether_addr_octet));
 844 }
 845
 846 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 847 {
 848         bool update = false;
 849
 850         if ((!!l_new->hostname != !!l_old->hostname) ||
 851             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 852                 free(l_old->hostname);
 853                 l_old->hostname = NULL;
 854
 855                 if (l_new->hostname)
 856                         l_old->hostname = strdup(l_new->hostname);
 857
 858                 update = true;
 859         }
 860
 861         if (l_old->leasetime != l_new->leasetime) {
 862                 l_old->leasetime = l_new->leasetime;
 863                 update = true;
 864         }
 865
 866         if (l_old->ipaddr != l_new->ipaddr) {
 867                 l_old->ipaddr = l_new->ipaddr;
 868                 lease_delete_assignments(l_old, false);
 869         }
 870
 871         if (l_old->hostid != l_new->hostid) {
 872                 l_old->hostid = l_new->hostid;
 873                 lease_delete_assignments(l_old, true);
 874         }
 875
 876         if (update)
 877                 lease_update_assignments(l_old);
 878
 879         free_lease(l_new);
 880 }
 881
 882 static void lease_delete(struct lease *l)
 883 {
 884         struct dhcp_assignment *a;
 885
 886         list_for_each_entry(a, &l->assignments, lease_list)
 887                 free_assignment(a);
 888
 889         free_lease(l);
 890 }
 891
 892 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 893                          struct vlist_node *node_old)
 894 {
 895         struct lease *lease_new = container_of(node_new, struct lease, node);
 896         struct lease *lease_old = container_of(node_old, struct lease, node);
 897
 898         if (node_old && node_new)
 899                 lease_change_config(lease_old, lease_new);
 900         else if (node_old)
 901                 lease_delete(lease_old);
 902 }
 903
 904 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 905 {
 906         struct lease *l;
 907
 908         vlist_for_each_element(&leases, l, node) {
 909                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 910                         return l;
 911         }
 912
 913         return NULL;
 914 }
 915
 916 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 917 {
 918         struct lease *l;
 919
 920         vlist_for_each_element(&leases, l, node) {
 921                 if (!memcmp(l->mac.ether_addr_octet, mac,
 922                             sizeof(l->mac.ether_addr_octet)))
 923                         return l;
 924         }
 925
 926         return NULL;
 927 }
 928
 929 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
 930 {
 931         struct lease *l;
 932
 933         vlist_for_each_element(&leases, l, node) {
 934                 if (l->hostid == hostid)
 935                         return l;
 936         }
 937
 938         return NULL;
 939 }
 940
 941 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
 942 {
 943         struct lease *l;
 944
 945         vlist_for_each_element(&leases, l, node) {
 946                 if (l->ipaddr == ipaddr)
 947                         return l;
 948         }
 949
 950         return NULL;
 951 }
 952
 953 void odhcpd_reload(void)
 954 {
 955         struct uci_context *uci = uci_alloc_context();
 956         struct interface *master = NULL, *i, *tmp;
 957
 958         if (!uci)
 959                 return;
 960
 961         vlist_update(&leases);
 962         avl_for_each_element(&interfaces, i, avl)
 963                 clean_interface(i);
 964
 965         struct uci_package *dhcp = NULL;
 966         if (!uci_load(uci, "dhcp", &dhcp)) {
 967                 struct uci_element *e;
 968
 969                 /* 1. Global settings */
 970                 uci_foreach_element(&dhcp->sections, e) {
 971                         struct uci_section *s = uci_to_section(e);
 972                         if (!strcmp(s->type, "odhcpd"))
 973                                 set_config(s);
 974                 }
 975
 976                 /* 2. DHCP pools */
 977                 uci_foreach_element(&dhcp->sections, e) {
 978                         struct uci_section *s = uci_to_section(e);
 979                         if (!strcmp(s->type, "dhcp"))
 980                                 set_interface(s);
 981                 }
 982
 983                 /* 3. Static leases */
 984                 uci_foreach_element(&dhcp->sections, e) {
 985                         struct uci_section* s = uci_to_section(e);
 986                         if (!strcmp(s->type, "host"))
 987                                 set_lease(s);
 988                 }
 989         }
 990
 991         if (config.dhcp_statefile) {
 992                 char *path = strdup(config.dhcp_statefile);
 993
 994                 mkdir_p(dirname(path), 0755);
 995                 free(path);
 996         }
 997
 998         vlist_flush(&leases);
 999
1000 #ifdef WITH_UBUS
1001         ubus_apply_network();
1002 #endif
1003
1004         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1005
1006         /* Test for */
1007         avl_for_each_element(&interfaces, i, avl) {
1008                 if (i->master)
1009                         continue;
1010
1011                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1012                         any_dhcpv6_slave = true;
1013
1014                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1015                         any_ra_slave = true;
1016
1017                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1018                         any_ndp_slave = true;
1019         }
1020
1021         /* Evaluate hybrid mode for master */
1022         avl_for_each_element(&interfaces, i, avl) {
1023                 if (!i->master)
1024                         continue;
1025
1026                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1027 #ifdef WITH_UBUS
1028                 if (!ubus_has_prefix(i->name, i->ifname))
1029                         hybrid_mode = MODE_RELAY;
1030 #endif
1031
1032                 if (i->dhcpv6 == MODE_HYBRID)
1033                         i->dhcpv6 = hybrid_mode;
1034
1035                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1036                         i->dhcpv6 = MODE_DISABLED;
1037
1038                 if (i->ra == MODE_HYBRID)
1039                         i->ra = hybrid_mode;
1040
1041                 if (i->ra == MODE_RELAY && !any_ra_slave)
1042                         i->ra = MODE_DISABLED;
1043
1044                 if (i->ndp == MODE_HYBRID)
1045                         i->ndp = hybrid_mode;
1046
1047                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1048                         i->ndp = MODE_DISABLED;
1049
1050                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1051                         master = i;
1052         }
1053
1054
1055         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1056                 if (i->inuse) {
1057                         /* Resolve hybrid mode */
1058                         if (i->dhcpv6 == MODE_HYBRID)
1059                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1060                                                 MODE_RELAY : MODE_SERVER;
1061
1062                         if (i->ra == MODE_HYBRID)
1063                                 i->ra = (master && master->ra == MODE_RELAY) ?
1064                                                 MODE_RELAY : MODE_SERVER;
1065
1066                         if (i->ndp == MODE_HYBRID)
1067                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1068                                                 MODE_RELAY : MODE_DISABLED;
1069
1070                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
1071                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
1072                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
1073 #ifdef DHCPV4_SUPPORT
1074                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
1075 #endif
1076                 } else
1077                         close_interface(i);
1078         }
1079
1080         uci_unload(uci, dhcp);
1081         uci_free_context(uci);
1082 }
1083
1084 static void handle_signal(int signal)
1085 {
1086         char b[1] = {0};
1087
1088         if (signal == SIGHUP) {
1089                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1090         } else
1091                 uloop_end();
1092 }
1093
1094 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1095 {
1096         char b[512];
1097         if (read(u->fd, b, sizeof(b)) < 0) {}
1098
1099         odhcpd_reload();
1100 }
1101
1102 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1103
1104 void odhcpd_run(void)
1105 {
1106         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1107
1108         reload_fd.fd = reload_pipe[0];
1109         uloop_fd_add(&reload_fd, ULOOP_READ);
1110
1111         signal(SIGTERM, handle_signal);
1112         signal(SIGINT, handle_signal);
1113         signal(SIGHUP, handle_signal);
1114
1115 #ifdef WITH_UBUS
1116         while (ubus_init())
1117                 sleep(1);
1118 #endif
1119
1120         odhcpd_reload();
1121         uloop_run();
1122 }