src/network/networkd-manager.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20  ***/
  21
  22 #include <sys/socket.h>
  23 #include <linux/if.h>
  24
  25 #include "conf-parser.h"
  26 #include "path-util.h"
  27 #include "networkd.h"
  28 #include "networkd-netdev.h"
  29 #include "networkd-link.h"
  30 #include "network-internal.h"
  31 #include "libudev-private.h"
  32 #include "udev-util.h"
  33 #include "rtnl-util.h"
  34 #include "bus-util.h"
  35 #include "def.h"
  36 #include "mkdir.h"
  37 #include "virt.h"
  38
  39 #include "sd-rtnl.h"
  40 #include "sd-daemon.h"
  41
  42 /* use 8 MB for receive socket kernel queue. */
  43 #define RCVBUF_SIZE    (8*1024*1024)
  44
  45 const char* const network_dirs[] = {
  46         "/etc/systemd/network",
  47         "/run/systemd/network",
  48         "/usr/lib/systemd/network",
  49 #ifdef HAVE_SPLIT_USR
  50         "/lib/systemd/network",
  51 #endif
  52         NULL};
  53
  54 static int setup_default_address_pool(Manager *m) {
  55         AddressPool *p;
  56         int r;
  57
  58         assert(m);
  59
  60         /* Add in the well-known private address ranges. */
  61
  62         r = address_pool_new_from_string(m, &p, AF_INET6, "fc00::", 7);
  63         if (r < 0)
  64                 return r;
  65
  66         r = address_pool_new_from_string(m, &p, AF_INET, "192.168.0.0", 16);
  67         if (r < 0)
  68                 return r;
  69
  70         r = address_pool_new_from_string(m, &p, AF_INET, "172.16.0.0", 12);
  71         if (r < 0)
  72                 return r;
  73
  74         r = address_pool_new_from_string(m, &p, AF_INET, "10.0.0.0", 8);
  75         if (r < 0)
  76                 return r;
  77
  78         return 0;
  79 }
  80
  81 static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
  82         Manager *m = userdata;
  83
  84         assert(s);
  85         assert(m);
  86
  87         m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
  88
  89         manager_connect_bus(m);
  90
  91         return 0;
  92 }
  93
  94 static int manager_reset_all(Manager *m) {
  95         Link *link;
  96         Iterator i;
  97         int r;
  98
  99         assert(m);
 100
 101         HASHMAP_FOREACH(link, m->links, i) {
 102                 r = link_carrier_reset(link);
 103                 if (r < 0)
 104                         log_link_warning_errno(link, r, "could not reset carrier: %m");
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int match_prepare_for_sleep(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
 111         Manager *m = userdata;
 112         int b, r;
 113
 114         assert(bus);
 115         assert(bus);
 116
 117         r = sd_bus_message_read(message, "b", &b);
 118         if (r < 0) {
 119                 log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");
 120                 return 0;
 121         }
 122
 123         if (b)
 124                 return 0;
 125
 126         log_debug("Coming back from suspend, resetting all connections...");
 127
 128         manager_reset_all(m);
 129
 130         return 0;
 131 }
 132
 133 int manager_connect_bus(Manager *m) {
 134         int r;
 135
 136         assert(m);
 137
 138         r = sd_bus_default_system(&m->bus);
 139         if (r == -ENOENT) {
 140                 /* We failed to connect? Yuck, we must be in early
 141                  * boot. Let's try in 5s again. As soon as we have
 142                  * kdbus we can stop doing this... */
 143
 144                 log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");
 145
 146                 r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);
 147                 if (r < 0)
 148                         return log_error_errno(r, "Failed to install bus reconnect time event: %m");
 149
 150                 return 0;
 151         } if (r < 0)
 152                 return r;
 153
 154         r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
 155                              "type='signal',"
 156                              "sender='org.freedesktop.login1',"
 157                              "interface='org.freedesktop.login1.Manager',"
 158                              "member='PrepareForSleep',"
 159                              "path='/org/freedesktop/login1'",
 160                              match_prepare_for_sleep,
 161                              m);
 162         if (r < 0)
 163                 return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
 164
 165         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
 166         if (r < 0)
 167                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 168
 169         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
 170         if (r < 0)
 171                return log_error_errno(r, "Failed to add link object vtable: %m");
 172
 173         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
 174         if (r < 0)
 175                 return log_error_errno(r, "Failed to add link enumerator: %m");
 176
 177         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/network", "org.freedesktop.network1.Network", network_vtable, network_object_find, m);
 178         if (r < 0)
 179                return log_error_errno(r, "Failed to add network object vtable: %m");
 180
 181         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/network", network_node_enumerator, m);
 182         if (r < 0)
 183                 return log_error_errno(r, "Failed to add network enumerator: %m");
 184
 185         r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
 186         if (r < 0)
 187                 return log_error_errno(r, "Failed to register name: %m");
 188
 189         r = sd_bus_attach_event(m->bus, m->event, 0);
 190         if (r < 0)
 191                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 192
 193         return 0;
 194 }
 195
 196 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
 197         Link *link = NULL;
 198         int r, ifindex;
 199
 200         assert(m);
 201         assert(device);
 202
 203         if (!streq_ptr(udev_device_get_action(device), "add"))
 204                 return 0;
 205
 206         ifindex = udev_device_get_ifindex(device);
 207         if (ifindex <= 0) {
 208                 log_debug("ignoring udev ADD event for device with invalid ifindex");
 209                 return 0;
 210         }
 211
 212         r = link_get(m, ifindex, &link);
 213         if (r == -ENODEV)
 214                 return 0;
 215         else if (r < 0)
 216                 return r;
 217
 218         r = link_initialized(link, device);
 219         if (r < 0)
 220                 return r;
 221
 222         return 0;
 223 }
 224
 225 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 226         Manager *m = userdata;
 227         struct udev_monitor *monitor = m->udev_monitor;
 228         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 229
 230         device = udev_monitor_receive_device(monitor);
 231         if (!device)
 232                 return -ENOMEM;
 233
 234         manager_udev_process_link(m, device);
 235         return 0;
 236 }
 237
 238 static int manager_connect_udev(Manager *m) {
 239         int r;
 240
 241         /* udev does not initialize devices inside containers,
 242          * so we rely on them being already initialized before
 243          * entering the container */
 244         if (detect_container(NULL) > 0)
 245                 return 0;
 246
 247         m->udev = udev_new();
 248         if (!m->udev)
 249                 return -ENOMEM;
 250
 251         m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 252         if (!m->udev_monitor)
 253                 return -ENOMEM;
 254
 255         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 256         if (r < 0)
 257                 return log_error_errno(r, "Could not add udev monitor filter: %m");
 258
 259         r = udev_monitor_enable_receiving(m->udev_monitor);
 260         if (r < 0) {
 261                 log_error("Could not enable udev monitor");
 262                 return r;
 263         }
 264
 265         r = sd_event_add_io(m->event,
 266                         &m->udev_event_source,
 267                         udev_monitor_get_fd(m->udev_monitor),
 268                         EPOLLIN, manager_dispatch_link_udev,
 269                         m);
 270         if (r < 0)
 271                 return r;
 272
 273         r = sd_event_source_set_description(m->udev_event_source, "networkd-udev");
 274         if (r < 0)
 275                 return r;
 276
 277         return 0;
 278 }
 279
 280 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
 281         Manager *m = userdata;
 282         Link *link = NULL;
 283         NetDev *netdev = NULL;
 284         uint16_t type;
 285         const char *name;
 286         int r, ifindex;
 287
 288         assert(rtnl);
 289         assert(message);
 290         assert(m);
 291
 292         if (sd_rtnl_message_is_error(message)) {
 293                 r = sd_rtnl_message_get_errno(message);
 294                 if (r < 0)
 295                         log_warning_errno(r, "rtnl: could not receive link: %m");
 296
 297                 return 0;
 298         }
 299
 300         r = sd_rtnl_message_get_type(message, &type);
 301         if (r < 0) {
 302                 log_warning_errno(r, "rtnl: could not get message type: %m");
 303                 return 0;
 304         }
 305
 306         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 307         if (r < 0) {
 308                 log_warning_errno(r, "rtnl: could not get ifindex: %m");
 309                 return 0;
 310         } else if (ifindex <= 0) {
 311                 log_warning("rtnl: received link message with invalid ifindex: %d", ifindex);
 312                 return 0;
 313         } else
 314                 link_get(m, ifindex, &link);
 315
 316         r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
 317         if (r < 0) {
 318                 log_warning_errno(r, "rtnl: received link message without ifname: %m");
 319                 return 0;
 320         } else
 321                 netdev_get(m, name, &netdev);
 322
 323         switch (type) {
 324         case RTM_NEWLINK:
 325                 if (!link) {
 326                         /* link is new, so add it */
 327                         r = link_add(m, message, &link);
 328                         if (r < 0) {
 329                                 log_warning_errno(r, "could not add new link: %m");
 330                                 return 0;
 331                         }
 332                 }
 333
 334                 if (netdev) {
 335                         /* netdev exists, so make sure the ifindex matches */
 336                         r = netdev_set_ifindex(netdev, message);
 337                         if (r < 0) {
 338                                 log_warning_errno(r, "could not set ifindex on netdev: %m");
 339                                 return 0;
 340                         }
 341                 }
 342
 343                 r = link_update(link, message);
 344                 if (r < 0)
 345                         return 0;
 346
 347                 break;
 348
 349         case RTM_DELLINK:
 350                 link_drop(link);
 351                 netdev_drop(netdev);
 352
 353                 break;
 354
 355         default:
 356                 assert_not_reached("Received invalid RTNL message type.");
 357         }
 358
 359         return 1;
 360 }
 361
 362 static int systemd_netlink_fd(void) {
 363         int n, fd, rtnl_fd = -EINVAL;
 364
 365         n = sd_listen_fds(true);
 366         if (n <= 0)
 367                 return -EINVAL;
 368
 369         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) {
 370                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
 371                         if (rtnl_fd >= 0)
 372                                 return -EINVAL;
 373
 374                         rtnl_fd = fd;
 375                 }
 376         }
 377
 378         return rtnl_fd;
 379 }
 380
 381 static int manager_connect_rtnl(Manager *m) {
 382         int fd, r;
 383
 384         assert(m);
 385
 386         fd = systemd_netlink_fd();
 387         if (fd < 0)
 388                 r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR);
 389         else
 390                 r = sd_rtnl_open_fd(&m->rtnl, fd, 0);
 391         if (r < 0)
 392                 return r;
 393
 394         r = sd_rtnl_inc_rcvbuf(m->rtnl, RCVBUF_SIZE);
 395         if (r < 0)
 396                 return r;
 397
 398         r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
 399         if (r < 0)
 400                 return r;
 401
 402         r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 403         if (r < 0)
 404                 return r;
 405
 406         r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
 407         if (r < 0)
 408                 return r;
 409
 410         r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, &link_rtnl_process_address, m);
 411         if (r < 0)
 412                 return r;
 413
 414         r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, &link_rtnl_process_address, m);
 415         if (r < 0)
 416                 return r;
 417
 418         return 0;
 419 }
 420
 421 int manager_new(Manager **ret) {
 422         _cleanup_manager_free_ Manager *m = NULL;
 423         int r;
 424
 425         m = new0(Manager, 1);
 426         if (!m)
 427                 return -ENOMEM;
 428
 429         m->state_file = strdup("/run/systemd/netif/state");
 430         if (!m->state_file)
 431                 return -ENOMEM;
 432
 433         r = sd_event_default(&m->event);
 434         if (r < 0)
 435                 return r;
 436
 437         sd_event_set_watchdog(m->event, true);
 438
 439         sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
 440         sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 441
 442         r = manager_connect_rtnl(m);
 443         if (r < 0)
 444                 return r;
 445
 446         r = manager_connect_udev(m);
 447         if (r < 0)
 448                 return r;
 449
 450         m->netdevs = hashmap_new(&string_hash_ops);
 451         if (!m->netdevs)
 452                 return -ENOMEM;
 453
 454         LIST_HEAD_INIT(m->networks);
 455
 456         r = setup_default_address_pool(m);
 457         if (r < 0)
 458                 return r;
 459
 460         *ret = m;
 461         m = NULL;
 462
 463         return 0;
 464 }
 465
 466 void manager_free(Manager *m) {
 467         Network *network;
 468         NetDev *netdev;
 469         Link *link;
 470         AddressPool *pool;
 471
 472         if (!m)
 473                 return;
 474
 475         free(m->state_file);
 476
 477         udev_monitor_unref(m->udev_monitor);
 478         udev_unref(m->udev);
 479         sd_bus_unref(m->bus);
 480         sd_bus_slot_unref(m->prepare_for_sleep_slot);
 481         sd_event_source_unref(m->udev_event_source);
 482         sd_event_source_unref(m->bus_retry_event_source);
 483         sd_event_unref(m->event);
 484
 485         while ((link = hashmap_first(m->links)))
 486                 link_unref(link);
 487         hashmap_free(m->links);
 488
 489         while ((network = m->networks))
 490                 network_free(network);
 491
 492         hashmap_free(m->networks_by_name);
 493
 494         while ((netdev = hashmap_first(m->netdevs)))
 495                 netdev_unref(netdev);
 496         hashmap_free(m->netdevs);
 497
 498         while ((pool = m->address_pools))
 499                 address_pool_free(pool);
 500
 501         sd_rtnl_unref(m->rtnl);
 502
 503         free(m);
 504 }
 505
 506 static bool manager_check_idle(void *userdata) {
 507         Manager *m = userdata;
 508         Link *link;
 509         Iterator i;
 510
 511         assert(m);
 512
 513         HASHMAP_FOREACH(link, m->links, i) {
 514                 /* we are not woken on udev activity, so let's just wait for the
 515                  * pending udev event */
 516                 if (link->state == LINK_STATE_PENDING)
 517                         return false;
 518
 519                 if (!link->network)
 520                         continue;
 521
 522                 /* we are not woken on netork activity, so let's stay around */
 523                 if (link_lldp_enabled(link) ||
 524                     link_ipv4ll_enabled(link) ||
 525                     link_dhcp4_server_enabled(link) ||
 526                     link_dhcp4_enabled(link) ||
 527                     link_dhcp6_enabled(link))
 528                         return false;
 529         }
 530
 531         return true;
 532 }
 533
 534 int manager_run(Manager *m) {
 535         assert(m);
 536
 537         if (m->bus)
 538                 return bus_event_loop_with_idle(
 539                                 m->event,
 540                                 m->bus,
 541                                 "org.freedesktop.network1",
 542                                 DEFAULT_EXIT_USEC,
 543                                 manager_check_idle,
 544                                 m);
 545         else
 546                 /* failed to connect to the bus, so we lose exit-on-idle logic,
 547                    this should not happen except if dbus is not around at all */
 548                 return sd_event_loop(m->event);
 549 }
 550
 551 int manager_load_config(Manager *m) {
 552         int r;
 553
 554         /* update timestamp */
 555         paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
 556
 557         r = netdev_load(m);
 558         if (r < 0)
 559                 return r;
 560
 561         r = network_load(m);
 562         if (r < 0)
 563                 return r;
 564
 565         return 0;
 566 }
 567
 568 bool manager_should_reload(Manager *m) {
 569         return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
 570 }
 571
 572 int manager_rtnl_enumerate_links(Manager *m) {
 573         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 574         sd_rtnl_message *link;
 575         int r;
 576
 577         assert(m);
 578         assert(m->rtnl);
 579
 580         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 581         if (r < 0)
 582                 return r;
 583
 584         r = sd_rtnl_message_request_dump(req, true);
 585         if (r < 0)
 586                 return r;
 587
 588         r = sd_rtnl_call(m->rtnl, req, 0, &reply);
 589         if (r < 0)
 590                 return r;
 591
 592         for (link = reply; link; link = sd_rtnl_message_next(link)) {
 593                 int k;
 594
 595                 m->enumerating = true;
 596
 597                 k = manager_rtnl_process_link(m->rtnl, link, m);
 598                 if (k < 0)
 599                         r = k;
 600
 601                 m->enumerating = false;
 602         }
 603
 604         return r;
 605 }
 606
 607 int manager_rtnl_enumerate_addresses(Manager *m) {
 608         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 609         sd_rtnl_message *addr;
 610         int r;
 611
 612         assert(m);
 613         assert(m->rtnl);
 614
 615         r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, 0, 0);
 616         if (r < 0)
 617                 return r;
 618
 619         r = sd_rtnl_message_request_dump(req, true);
 620         if (r < 0)
 621                 return r;
 622
 623         r = sd_rtnl_call(m->rtnl, req, 0, &reply);
 624         if (r < 0)
 625                 return r;
 626
 627         for (addr = reply; addr; addr = sd_rtnl_message_next(addr)) {
 628                 int k;
 629
 630                 m->enumerating = true;
 631
 632                 k = link_rtnl_process_address(m->rtnl, addr, m);
 633                 if (k < 0)
 634                         r = k;
 635
 636                 m->enumerating = false;
 637         }
 638
 639         return r;
 640 }
 641
 642 static int set_put_in_addr(Set *s, const struct in_addr *address) {
 643         char *p;
 644         int r;
 645
 646         assert(s);
 647
 648         r = in_addr_to_string(AF_INET, (const union in_addr_union*) address, &p);
 649         if (r < 0)
 650                 return r;
 651
 652         r = set_consume(s, p);
 653         if (r == -EEXIST)
 654                 return 0;
 655
 656         return r;
 657 }
 658
 659 static int set_put_in_addrv(Set *s, const struct in_addr *addresses, int n) {
 660         int r, i, c = 0;
 661
 662         assert(s);
 663         assert(n <= 0 || addresses);
 664
 665         for (i = 0; i < n; i++) {
 666                 r = set_put_in_addr(s, addresses+i);
 667                 if (r < 0)
 668                         return r;
 669
 670                 c += r;
 671         }
 672
 673         return c;
 674 }
 675
 676 static void print_string_set(FILE *f, const char *field, Set *s) {
 677         bool space = false;
 678         Iterator i;
 679         char *p;
 680
 681         if (set_isempty(s))
 682                 return;
 683
 684         fputs(field, f);
 685
 686         SET_FOREACH(p, s, i) {
 687                 if (space)
 688                         fputc(' ', f);
 689                 fputs(p, f);
 690                 space = true;
 691         }
 692         fputc('\n', f);
 693 }
 694
 695 int manager_save(Manager *m) {
 696         _cleanup_set_free_free_ Set *dns = NULL, *ntp = NULL, *domains = NULL;
 697         Link *link;
 698         Iterator i;
 699         _cleanup_free_ char *temp_path = NULL;
 700         _cleanup_fclose_ FILE *f = NULL;
 701         LinkOperationalState operstate = LINK_OPERSTATE_OFF;
 702         const char *operstate_str;
 703         int r;
 704
 705         assert(m);
 706         assert(m->state_file);
 707
 708         /* We add all NTP and DNS server to a set, to filter out duplicates */
 709         dns = set_new(&string_hash_ops);
 710         if (!dns)
 711                 return -ENOMEM;
 712
 713         ntp = set_new(&string_hash_ops);
 714         if (!ntp)
 715                 return -ENOMEM;
 716
 717         domains = set_new(&string_hash_ops);
 718         if (!domains)
 719                 return -ENOMEM;
 720
 721         HASHMAP_FOREACH(link, m->links, i) {
 722                 if (link->flags & IFF_LOOPBACK)
 723                         continue;
 724
 725                 if (link->operstate > operstate)
 726                         operstate = link->operstate;
 727
 728                 if (!link->network)
 729                         continue;
 730
 731                 /* First add the static configured entries */
 732                 r = set_put_strdupv(dns, link->network->dns);
 733                 if (r < 0)
 734                         return r;
 735
 736                 r = set_put_strdupv(ntp, link->network->ntp);
 737                 if (r < 0)
 738                         return r;
 739
 740                 r = set_put_strdupv(domains, link->network->domains);
 741                 if (r < 0)
 742                         return r;
 743
 744                 if (!link->dhcp_lease)
 745                         continue;
 746
 747                 /* Secondly, add the entries acquired via DHCP */
 748                 if (link->network->dhcp_dns) {
 749                         const struct in_addr *addresses;
 750
 751                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
 752                         if (r > 0) {
 753                                 r = set_put_in_addrv(dns, addresses, r);
 754                                 if (r < 0)
 755                                         return r;
 756                         } else if (r < 0 && r != -ENOENT)
 757                                 return r;
 758                 }
 759
 760                 if (link->network->dhcp_ntp) {
 761                         const struct in_addr *addresses;
 762
 763                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
 764                         if (r > 0) {
 765                                 r = set_put_in_addrv(ntp, addresses, r);
 766                                 if (r < 0)
 767                                         return r;
 768                         } else if (r < 0 && r != -ENOENT)
 769                                 return r;
 770                 }
 771
 772                 if (link->network->dhcp_domains) {
 773                         const char *domainname;
 774
 775                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
 776                         if (r >= 0) {
 777                                 r = set_put_strdup(domains, domainname);
 778                                 if (r < 0)
 779                                         return r;
 780                         } else if (r != -ENOENT)
 781                                 return r;
 782                 }
 783         }
 784
 785         operstate_str = link_operstate_to_string(operstate);
 786         assert(operstate_str);
 787
 788         r = fopen_temporary(m->state_file, &f, &temp_path);
 789         if (r < 0)
 790                 return r;
 791
 792         fchmod(fileno(f), 0644);
 793
 794         fprintf(f,
 795                 "# This is private data. Do not parse.\n"
 796                 "OPER_STATE=%s\n", operstate_str);
 797
 798         print_string_set(f, "DNS=", dns);
 799         print_string_set(f, "NTP=", ntp);
 800         print_string_set(f, "DOMAINS=", domains);
 801
 802         r = fflush_and_check(f);
 803         if (r < 0)
 804                 goto fail;
 805
 806         if (rename(temp_path, m->state_file) < 0) {
 807                 r = -errno;
 808                 goto fail;
 809         }
 810
 811         if (m->operational_state != operstate) {
 812                 m->operational_state = operstate;
 813                 r = manager_send_changed(m, "OperationalState", NULL);
 814                 if (r < 0)
 815                         log_error_errno(r, "Could not emit changed OperationalState: %m");
 816         }
 817
 818         return 0;
 819
 820 fail:
 821         log_error_errno(r, "Failed to save network state to %s: %m", m->state_file);
 822         unlink(m->state_file);
 823         unlink(temp_path);
 824         return r;
 825 }
 826
 827 int manager_address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
 828         AddressPool *p;
 829         int r;
 830
 831         assert(m);
 832         assert(prefixlen > 0);
 833         assert(found);
 834
 835         LIST_FOREACH(address_pools, p, m->address_pools) {
 836                 if (p->family != family)
 837                         continue;
 838
 839                 r = address_pool_acquire(p, prefixlen, found);
 840                 if (r != 0)
 841                         return r;
 842         }
 843
 844         return 0;
 845 }
 846
 847 const char *address_family_boolean_to_string(AddressFamilyBoolean b) {
 848         if (b == ADDRESS_FAMILY_YES ||
 849             b == ADDRESS_FAMILY_NO)
 850                 return yes_no(b == ADDRESS_FAMILY_YES);
 851
 852         if (b == ADDRESS_FAMILY_IPV4)
 853                 return "ipv4";
 854         if (b == ADDRESS_FAMILY_IPV6)
 855                 return "ipv6";
 856
 857         return NULL;
 858 }
 859
 860 AddressFamilyBoolean address_family_boolean_from_string(const char *s) {
 861         int r;
 862
 863         /* Make this a true superset of a boolean */
 864
 865         r = parse_boolean(s);
 866         if (r > 0)
 867                 return ADDRESS_FAMILY_YES;
 868         if (r == 0)
 869                 return ADDRESS_FAMILY_NO;
 870
 871         if (streq(s, "ipv4"))
 872                 return ADDRESS_FAMILY_IPV4;
 873         if (streq(s, "ipv6"))
 874                 return ADDRESS_FAMILY_IPV6;
 875
 876         return _ADDRESS_FAMILY_BOOLEAN_INVALID;
 877 }
 878
 879 DEFINE_CONFIG_PARSE_ENUM(config_parse_address_family_boolean, address_family_boolean, AddressFamilyBoolean, "Failed to parse option");