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