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 <string.h>
   8 #include <sys/stat.h>
   9 #include <syslog.h>
  10
  11 #include <uci.h>
  12 #include <uci_blob.h>
  13
  14 #include "odhcpd.h"
  15
  16 static struct blob_buf b;
  17 static int reload_pipe[2];
  18 struct list_head leases = LIST_HEAD_INIT(leases);
  19 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  20 struct config config = {.legacy = false, .main_dhcpv4 = false,
  21                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  22                         .log_level = LOG_INFO};
  23
  24 enum {
  25         IFACE_ATTR_INTERFACE,
  26         IFACE_ATTR_IFNAME,
  27         IFACE_ATTR_NETWORKID,
  28         IFACE_ATTR_DYNAMICDHCP,
  29         IFACE_ATTR_IGNORE,
  30         IFACE_ATTR_LEASETIME,
  31         IFACE_ATTR_LIMIT,
  32         IFACE_ATTR_START,
  33         IFACE_ATTR_MASTER,
  34         IFACE_ATTR_UPSTREAM,
  35         IFACE_ATTR_RA,
  36         IFACE_ATTR_DHCPV4,
  37         IFACE_ATTR_DHCPV6,
  38         IFACE_ATTR_NDP,
  39         IFACE_ATTR_ROUTER,
  40         IFACE_ATTR_DNS,
  41         IFACE_ATTR_DOMAIN,
  42         IFACE_ATTR_FILTER_CLASS,
  43         IFACE_ATTR_DHCPV6_RAW,
  44         IFACE_ATTR_DHCPV6_ASSIGNALL,
  45         IFACE_ATTR_RA_DEFAULT,
  46         IFACE_ATTR_RA_MANAGEMENT,
  47         IFACE_ATTR_RA_OFFLINK,
  48         IFACE_ATTR_RA_PREFERENCE,
  49         IFACE_ATTR_RA_ADVROUTER,
  50         IFACE_ATTR_RA_MININTERVAL,
  51         IFACE_ATTR_RA_MAXINTERVAL,
  52         IFACE_ATTR_RA_LIFETIME,
  53         IFACE_ATTR_RA_USELEASETIME,
  54         IFACE_ATTR_PD_MANAGER,
  55         IFACE_ATTR_PD_CER,
  56         IFACE_ATTR_NDPROXY_ROUTING,
  57         IFACE_ATTR_NDPROXY_SLAVE,
  58         IFACE_ATTR_MAX
  59 };
  60
  61 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  62         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  69         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  70         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  71         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  72         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  74         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  77         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  78         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  79         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  80         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  82         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  85         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  86         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  87         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  93         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  95 };
  96
  97 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  98         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 100         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 101 };
 102
 103 const struct uci_blob_param_list interface_attr_list = {
 104         .n_params = IFACE_ATTR_MAX,
 105         .params = iface_attrs,
 106         .info = iface_attr_info,
 107 };
 108
 109 enum {
 110         LEASE_ATTR_IP,
 111         LEASE_ATTR_MAC,
 112         LEASE_ATTR_DUID,
 113         LEASE_ATTR_HOSTID,
 114         LEASE_ATTR_LEASETIME,
 115         LEASE_ATTR_NAME,
 116         LEASE_ATTR_MAX
 117 };
 118
 119 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 120         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 121         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 122         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 123         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 124         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 125         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 126 };
 127
 128 const struct uci_blob_param_list lease_attr_list = {
 129         .n_params = LEASE_ATTR_MAX,
 130         .params = lease_attrs,
 131 };
 132
 133 enum {
 134         ODHCPD_ATTR_LEGACY,
 135         ODHCPD_ATTR_MAINDHCP,
 136         ODHCPD_ATTR_LEASEFILE,
 137         ODHCPD_ATTR_LEASETRIGGER,
 138         ODHCPD_ATTR_LOGLEVEL,
 139         ODHCPD_ATTR_MAX
 140 };
 141
 142 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 143         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 144         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 145         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 146         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 147         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 148 };
 149
 150 const struct uci_blob_param_list odhcpd_attr_list = {
 151         .n_params = ODHCPD_ATTR_MAX,
 152         .params = odhcpd_attrs,
 153 };
 154
 155 static int mkdir_p(char *dir, mode_t mask)
 156 {
 157         char *l = strrchr(dir, '/');
 158         int ret;
 159
 160         if (!l)
 161                 return 0;
 162
 163         *l = '\0';
 164
 165         if (mkdir_p(dir, mask))
 166                 return -1;
 167
 168         *l = '/';
 169
 170         ret = mkdir(dir, mask);
 171         if (ret && errno == EEXIST)
 172                 return 0;
 173
 174         if (ret)
 175                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 176
 177         return ret;
 178 }
 179
 180 static void free_lease(struct lease *l)
 181 {
 182         if (l->head.next)
 183                 list_del(&l->head);
 184
 185         free(l->duid);
 186         free(l);
 187 }
 188
 189 static struct interface* get_interface(const char *name)
 190 {
 191         struct interface *c;
 192         list_for_each_entry(c, &interfaces, head)
 193                 if (!strcmp(c->name, name))
 194                         return c;
 195         return NULL;
 196 }
 197
 198 static void set_interface_defaults(struct interface *iface)
 199 {
 200         iface->managed = 1;
 201         iface->learn_routes = 1;
 202         iface->dhcpv4_leasetime = 43200;
 203         iface->dhcpv6_assignall = true;
 204         iface->ra_maxinterval = 600;
 205         iface->ra_mininterval = iface->ra_maxinterval/3;
 206         iface->ra_lifetime = -1;
 207 }
 208
 209 static void clean_interface(struct interface *iface)
 210 {
 211         free(iface->dns);
 212         free(iface->search);
 213         free(iface->upstream);
 214         free(iface->dhcpv4_router);
 215         free(iface->dhcpv4_dns);
 216         free(iface->dhcpv6_raw);
 217         free(iface->filter_class);
 218         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 219         set_interface_defaults(iface);
 220 }
 221
 222 static void close_interface(struct interface *iface)
 223 {
 224         if (iface->head.next)
 225                 list_del(&iface->head);
 226
 227         setup_router_interface(iface, false);
 228         setup_dhcpv6_interface(iface, false);
 229         setup_ndp_interface(iface, false);
 230         setup_dhcpv4_interface(iface, false);
 231
 232         clean_interface(iface);
 233         free(iface);
 234 }
 235
 236 static int parse_mode(const char *mode)
 237 {
 238         if (!strcmp(mode, "disabled"))
 239                 return RELAYD_DISABLED;
 240         else if (!strcmp(mode, "server"))
 241                 return RELAYD_SERVER;
 242         else if (!strcmp(mode, "relay"))
 243                 return RELAYD_RELAY;
 244         else if (!strcmp(mode, "hybrid"))
 245                 return RELAYD_HYBRID;
 246         else
 247                 return -1;
 248 }
 249
 250 static void set_config(struct uci_section *s)
 251 {
 252         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 253
 254         blob_buf_init(&b, 0);
 255         uci_to_blob(&b, s, &odhcpd_attr_list);
 256         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 257
 258         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 259                 config.legacy = blobmsg_get_bool(c);
 260
 261         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 262                 config.main_dhcpv4 = blobmsg_get_bool(c);
 263
 264         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 265                 free(config.dhcp_statefile);
 266                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 267         }
 268
 269         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 270                 free(config.dhcp_cb);
 271                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 272         }
 273
 274         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 275                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 276
 277                 if (config.log_level != log_level) {
 278                         config.log_level = log_level;
 279                         setlogmask(LOG_UPTO(config.log_level));
 280                 }
 281         }
 282 }
 283
 284 static double parse_leasetime(struct blob_attr *c) {
 285         char *val = blobmsg_get_string(c), *endptr = NULL;
 286         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 287
 288         if (time && endptr && endptr[0]) {
 289                 if (endptr[0] == 's')
 290                         time *= 1;
 291                 else if (endptr[0] == 'm')
 292                         time *= 60;
 293                 else if (endptr[0] == 'h')
 294                         time *= 3600;
 295                 else if (endptr[0] == 'd')
 296                         time *= 24 * 3600;
 297                 else if (endptr[0] == 'w')
 298                         time *= 7 * 24 * 3600;
 299                 else
 300                         goto err;
 301         }
 302
 303         if (time < 60)
 304                 time = 60;
 305
 306         return time;
 307
 308 err:
 309         return -1;
 310 }
 311
 312 static int set_lease(struct uci_section *s)
 313 {
 314         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 315
 316         blob_buf_init(&b, 0);
 317         uci_to_blob(&b, s, &lease_attr_list);
 318         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 319
 320         size_t hostlen = 1;
 321         if ((c = tb[LEASE_ATTR_NAME]))
 322                 hostlen = blobmsg_data_len(c);
 323
 324         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 325         if (!lease)
 326                 goto err;
 327
 328         if (hostlen > 1)
 329                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 330
 331         if ((c = tb[LEASE_ATTR_IP]))
 332                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 333                         goto err;
 334
 335         if ((c = tb[LEASE_ATTR_MAC]))
 336                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 337                         goto err;
 338
 339         if ((c = tb[LEASE_ATTR_DUID])) {
 340                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 341                 lease->duid = malloc(duidlen);
 342                 if (!lease->duid)
 343                         goto err;
 344
 345                 ssize_t len = odhcpd_unhexlify(lease->duid,
 346                                 duidlen, blobmsg_get_string(c));
 347
 348                 if (len < 0)
 349                         goto err;
 350
 351                 lease->duid_len = len;
 352         }
 353
 354         if ((c = tb[LEASE_ATTR_HOSTID])) {
 355                 errno = 0;
 356                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 357                 if (errno)
 358                         goto err;
 359         }
 360
 361         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 362                 double time = parse_leasetime(c);
 363                 if (time < 0)
 364                         goto err;
 365
 366                 lease->dhcpv4_leasetime = time;
 367         }
 368
 369         list_add(&lease->head, &leases);
 370         return 0;
 371
 372 err:
 373         if (lease)
 374                 free_lease(lease);
 375
 376         return -1;
 377 }
 378
 379 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 380 {
 381         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 382         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 383
 384         if (tb[IFACE_ATTR_INTERFACE])
 385                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 386
 387         if (!name)
 388                 return -1;
 389
 390         struct interface *iface = get_interface(name);
 391         if (!iface) {
 392                 iface = calloc(1, sizeof(*iface));
 393                 if (!iface)
 394                         return -1;
 395
 396                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 397
 398                 set_interface_defaults(iface);
 399
 400                 list_add(&iface->head, &interfaces);
 401                 overwrite = true;
 402         }
 403
 404         const char *ifname = NULL;
 405         if (overwrite) {
 406                 if ((c = tb[IFACE_ATTR_IFNAME]))
 407                         ifname = blobmsg_get_string(c);
 408                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 409                         ifname = blobmsg_get_string(c);
 410         }
 411
 412 #ifdef WITH_UBUS
 413         if (overwrite || !iface->ifname[0])
 414                 ifname = ubus_get_ifname(name);
 415 #endif
 416
 417         if (!iface->ifname[0] && !ifname)
 418                 goto err;
 419
 420         if (ifname)
 421                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 422
 423         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 424                 goto err;
 425
 426         iface->inuse = true;
 427
 428         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 429                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 430
 431         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 432                 iface->ignore = blobmsg_get_bool(c);
 433
 434         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 435                 double time = parse_leasetime(c);
 436                 if (time < 0)
 437                         goto err;
 438
 439                 iface->dhcpv4_leasetime = time;
 440         }
 441
 442         if ((c = tb[IFACE_ATTR_START])) {
 443                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 444
 445                 if (config.main_dhcpv4 && config.legacy)
 446                         iface->dhcpv4 = RELAYD_SERVER;
 447         }
 448
 449         if ((c = tb[IFACE_ATTR_LIMIT]))
 450                 iface->dhcpv4_end.s_addr = htonl(
 451                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 452
 453         if ((c = tb[IFACE_ATTR_MASTER]))
 454                 iface->master = blobmsg_get_bool(c);
 455
 456         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 457                 struct blob_attr *cur;
 458                 unsigned rem;
 459
 460                 blobmsg_for_each_attr(cur, c, rem) {
 461                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 462                                 continue;
 463
 464                         iface->upstream = realloc(iface->upstream,
 465                                         iface->upstream_len + blobmsg_data_len(cur));
 466                         if (!iface->upstream)
 467                                 goto err;
 468
 469                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 470                         iface->upstream_len += blobmsg_data_len(cur);
 471                 }
 472         }
 473
 474         int mode;
 475         if ((c = tb[IFACE_ATTR_RA])) {
 476                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 477                         iface->ra = mode;
 478                 else
 479                         goto err;
 480         }
 481
 482         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 483                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 484                         if (config.main_dhcpv4)
 485                                 iface->dhcpv4 = mode;
 486                 }
 487                 else
 488                         goto err;
 489         }
 490
 491         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 492                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 493                         iface->dhcpv6 = mode;
 494                 else
 495                         goto err;
 496         }
 497
 498         if ((c = tb[IFACE_ATTR_NDP])) {
 499                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 500                         iface->ndp = mode;
 501                 else
 502                         goto err;
 503         }
 504
 505         if ((c = tb[IFACE_ATTR_ROUTER])) {
 506                 struct blob_attr *cur;
 507                 unsigned rem;
 508
 509                 blobmsg_for_each_attr(cur, c, rem) {
 510                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 511                                 continue;
 512
 513                         struct in_addr addr4;
 514                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 515                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 516                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 517                                 if (!iface->dhcpv4_router)
 518                                         goto err;
 519
 520                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 521                         } else
 522                                 goto err;
 523                 }
 524         }
 525
 526         if ((c = tb[IFACE_ATTR_DNS])) {
 527                 struct blob_attr *cur;
 528                 unsigned rem;
 529
 530                 iface->always_rewrite_dns = true;
 531                 blobmsg_for_each_attr(cur, c, rem) {
 532                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 533                                 continue;
 534
 535                         struct in_addr addr4;
 536                         struct in6_addr addr6;
 537                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 538                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 539                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 540                                 if (!iface->dhcpv4_dns)
 541                                         goto err;
 542
 543                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 544                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 545                                 iface->dns = realloc(iface->dns,
 546                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 547                                 if (!iface->dns)
 548                                         goto err;
 549
 550                                 iface->dns[iface->dns_cnt - 1] = addr6;
 551                         } else
 552                                 goto err;
 553                 }
 554         }
 555
 556         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 557                 struct blob_attr *cur;
 558                 unsigned rem;
 559
 560                 blobmsg_for_each_attr(cur, c, rem) {
 561                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 562                                 continue;
 563
 564                         uint8_t buf[256];
 565                         char *domain = blobmsg_get_string(cur);
 566                         size_t domainlen = strlen(domain);
 567                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 568                                 domain[domainlen - 1] = 0;
 569
 570                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 571                         if (len <= 0)
 572                                 goto err;
 573
 574                         iface->search = realloc(iface->search, iface->search_len + len);
 575                         if (!iface->search)
 576                                 goto err;
 577
 578                         memcpy(&iface->search[iface->search_len], buf, len);
 579                         iface->search_len += len;
 580                 }
 581         }
 582
 583         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 584                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 585                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 586         }
 587
 588         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 589                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 590                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 591                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 592         }
 593
 594         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 595                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 596
 597         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 598                 iface->default_router = blobmsg_get_u32(c);
 599
 600         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 601                 iface->managed = blobmsg_get_u32(c);
 602
 603         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 604                 iface->ra_not_onlink = blobmsg_get_bool(c);
 605
 606         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 607                 iface->ra_advrouter = blobmsg_get_bool(c);
 608
 609         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 610                 iface->ra_mininterval =  blobmsg_get_u32(c);
 611
 612         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 613                 iface->ra_maxinterval = blobmsg_get_u32(c);
 614
 615         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 616                 iface->ra_lifetime = blobmsg_get_u32(c);
 617
 618         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 619                 iface->ra_useleasetime = blobmsg_get_bool(c);
 620
 621         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 622                 const char *prio = blobmsg_get_string(c);
 623
 624                 if (!strcmp(prio, "high"))
 625                         iface->route_preference = 1;
 626                 else if (!strcmp(prio, "low"))
 627                         iface->route_preference = -1;
 628                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 629                         iface->route_preference = 0;
 630                 else
 631                         goto err;
 632         }
 633
 634         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 635                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 636                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 637
 638         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 639                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 640                 goto err;
 641
 642         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 643                 iface->learn_routes = blobmsg_get_bool(c);
 644
 645         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 646                 iface->external = blobmsg_get_bool(c);
 647
 648         return 0;
 649
 650 err:
 651         close_interface(iface);
 652         return -1;
 653 }
 654
 655 static int set_interface(struct uci_section *s)
 656 {
 657         blob_buf_init(&b, 0);
 658         uci_to_blob(&b, s, &interface_attr_list);
 659
 660         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 661 }
 662
 663 void odhcpd_reload(void)
 664 {
 665         struct uci_context *uci = uci_alloc_context();
 666
 667         while (!list_empty(&leases))
 668                 free_lease(list_first_entry(&leases, struct lease, head));
 669
 670         struct interface *master = NULL, *i, *n;
 671
 672         if (!uci)
 673                 return;
 674
 675         list_for_each_entry(i, &interfaces, head)
 676                 clean_interface(i);
 677
 678         struct uci_package *dhcp = NULL;
 679         if (!uci_load(uci, "dhcp", &dhcp)) {
 680                 struct uci_element *e;
 681                 uci_foreach_element(&dhcp->sections, e) {
 682                         struct uci_section *s = uci_to_section(e);
 683                         if (!strcmp(s->type, "host"))
 684                                 set_lease(s);
 685                         else if (!strcmp(s->type, "odhcpd"))
 686                                 set_config(s);
 687                 }
 688
 689                 uci_foreach_element(&dhcp->sections, e) {
 690                         struct uci_section *s = uci_to_section(e);
 691                         if (!strcmp(s->type, "dhcp"))
 692                                 set_interface(s);
 693                 }
 694         }
 695
 696         if (config.dhcp_statefile) {
 697                 char *path = strdup(config.dhcp_statefile);
 698
 699                 mkdir_p(dirname(path), 0755);
 700                 free(path);
 701         }
 702
 703 #ifdef WITH_UBUS
 704         ubus_apply_network();
 705 #endif
 706
 707         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 708
 709         /* Test for */
 710         list_for_each_entry(i, &interfaces, head) {
 711                 if (i->master)
 712                         continue;
 713
 714                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 715                         any_dhcpv6_slave = true;
 716
 717                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 718                         any_ra_slave = true;
 719
 720                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 721                         any_ndp_slave = true;
 722         }
 723
 724         /* Evaluate hybrid mode for master */
 725         list_for_each_entry(i, &interfaces, head) {
 726                 if (!i->master)
 727                         continue;
 728
 729                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 730 #ifdef WITH_UBUS
 731                 if (!ubus_has_prefix(i->name, i->ifname))
 732                         hybrid_mode = RELAYD_RELAY;
 733 #endif
 734
 735                 if (i->dhcpv6 == RELAYD_HYBRID)
 736                         i->dhcpv6 = hybrid_mode;
 737
 738                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 739                         i->dhcpv6 = RELAYD_DISABLED;
 740
 741                 if (i->ra == RELAYD_HYBRID)
 742                         i->ra = hybrid_mode;
 743
 744                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 745                         i->ra = RELAYD_DISABLED;
 746
 747                 if (i->ndp == RELAYD_HYBRID)
 748                         i->ndp = hybrid_mode;
 749
 750                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 751                         i->ndp = RELAYD_DISABLED;
 752
 753                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 754                         master = i;
 755         }
 756
 757
 758         list_for_each_entry_safe(i, n, &interfaces, head) {
 759                 if (i->inuse) {
 760                         /* Resolve hybrid mode */
 761                         if (i->dhcpv6 == RELAYD_HYBRID)
 762                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 763                                                 RELAYD_RELAY : RELAYD_SERVER;
 764
 765                         if (i->ra == RELAYD_HYBRID)
 766                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 767                                                 RELAYD_RELAY : RELAYD_SERVER;
 768
 769                         if (i->ndp == RELAYD_HYBRID)
 770                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 771                                                 RELAYD_RELAY : RELAYD_DISABLED;
 772
 773                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 774                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 775                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 776                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 777                 } else
 778                         close_interface(i);
 779         }
 780
 781         ndp_handle_addr6_dump();
 782         uci_unload(uci, dhcp);
 783         uci_free_context(uci);
 784 }
 785
 786 static void handle_signal(int signal)
 787 {
 788         char b[1] = {0};
 789
 790         if (signal == SIGHUP) {
 791                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 792         } else
 793                 uloop_end();
 794 }
 795
 796 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 797 {
 798         char b[512];
 799         if (read(u->fd, b, sizeof(b)) < 0) {}
 800
 801         odhcpd_reload();
 802 }
 803
 804 static struct uloop_fd reload_fd = { .cb = reload_cb };
 805
 806 void odhcpd_run(void)
 807 {
 808         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 809
 810         reload_fd.fd = reload_pipe[0];
 811         uloop_fd_add(&reload_fd, ULOOP_READ);
 812
 813         signal(SIGTERM, handle_signal);
 814         signal(SIGINT, handle_signal);
 815         signal(SIGHUP, handle_signal);
 816
 817 #ifdef WITH_UBUS
 818         while (init_ubus())
 819                 sleep(1);
 820 #endif
 821
 822         odhcpd_reload();
 823         uloop_run();
 824
 825         while (!list_empty(&interfaces))
 826                 close_interface(list_first_entry(&interfaces, struct interface, head));
 827 }
 828