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