src/network/networkctl.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2014 Lennart Poettering
   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 <stdbool.h>
  23 #include <getopt.h>
  24 #include <net/if.h>
  25
  26 #include "sd-network.h"
  27 #include "sd-rtnl.h"
  28 #include "sd-hwdb.h"
  29 #include "libudev.h"
  30
  31 #include "strv.h"
  32 #include "build.h"
  33 #include "util.h"
  34 #include "pager.h"
  35 #include "rtnl-util.h"
  36 #include "udev-util.h"
  37 #include "hwdb-util.h"
  38 #include "arphrd-list.h"
  39 #include "local-addresses.h"
  40 #include "socket-util.h"
  41 #include "ether-addr-util.h"
  42
  43 static bool arg_no_pager = false;
  44 static bool arg_legend = true;
  45 static bool arg_all = false;
  46
  47 static void pager_open_if_enabled(void) {
  48
  49         if (arg_no_pager)
  50                 return;
  51
  52         pager_open(false);
  53 }
  54
  55 static int link_get_type_string(int iftype, struct udev_device *d, char **ret) {
  56         const char *t;
  57         char *p;
  58
  59         if (iftype == ARPHRD_ETHER && d) {
  60                 const char *devtype, *id = NULL;
  61                 /* WLANs have iftype ARPHRD_ETHER, but we want
  62                  * to show a more useful type string for
  63                  * them */
  64
  65                 devtype = udev_device_get_devtype(d);
  66                 if (streq_ptr(devtype, "wlan"))
  67                         id = "wlan";
  68                 else if (streq_ptr(devtype, "wwan"))
  69                         id = "wwan";
  70
  71                 if (id) {
  72                         p = strdup(id);
  73                         if (!p)
  74                                 return -ENOMEM;
  75
  76                         *ret = p;
  77                         return 1;
  78                 }
  79         }
  80
  81         t = arphrd_to_name(iftype);
  82         if (!t) {
  83                 *ret = NULL;
  84                 return 0;
  85         }
  86
  87         p = strdup(t);
  88         if (!p)
  89                 return -ENOMEM;
  90
  91         ascii_strlower(p);
  92         *ret = p;
  93
  94         return 0;
  95 }
  96
  97 typedef struct LinkInfo {
  98         const char *name;
  99         int ifindex;
 100         unsigned iftype;
 101 } LinkInfo;
 102
 103 static int link_info_compare(const void *a, const void *b) {
 104         const LinkInfo *x = a, *y = b;
 105
 106         return x->ifindex - y->ifindex;
 107 }
 108
 109 static int decode_and_sort_links(sd_rtnl_message *m, LinkInfo **ret) {
 110         _cleanup_free_ LinkInfo *links = NULL;
 111         size_t size = 0, c = 0;
 112         sd_rtnl_message *i;
 113         int r;
 114
 115         for (i = m; i; i = sd_rtnl_message_next(i)) {
 116                 const char *name;
 117                 unsigned iftype;
 118                 uint16_t type;
 119                 int ifindex;
 120
 121                 r = sd_rtnl_message_get_type(i, &type);
 122                 if (r < 0)
 123                         return r;
 124
 125                 if (type != RTM_NEWLINK)
 126                         continue;
 127
 128                 r = sd_rtnl_message_link_get_ifindex(i, &ifindex);
 129                 if (r < 0)
 130                         return r;
 131
 132                 r = sd_rtnl_message_read_string(i, IFLA_IFNAME, &name);
 133                 if (r < 0)
 134                         return r;
 135
 136                 r = sd_rtnl_message_link_get_type(i, &iftype);
 137                 if (r < 0)
 138                         return r;
 139
 140                 if (!GREEDY_REALLOC(links, size, c+1))
 141                         return -ENOMEM;
 142
 143                 links[c].name = name;
 144                 links[c].ifindex = ifindex;
 145                 links[c].iftype = iftype;
 146                 c++;
 147         }
 148
 149         qsort_safe(links, c, sizeof(LinkInfo), link_info_compare);
 150
 151         *ret = links;
 152         links = NULL;
 153
 154         return (int) c;
 155 }
 156
 157 static void operational_state_to_color(const char *state, const char **on, const char **off) {
 158         assert(on);
 159         assert(off);
 160
 161         if (streq_ptr(state, "routable")) {
 162                 *on = ansi_highlight_green();
 163                 *off = ansi_highlight_off();
 164         } else if (streq_ptr(state, "degraded")) {
 165                 *on = ansi_highlight_yellow();
 166                 *off = ansi_highlight_off();
 167         } else
 168                 *on = *off = "";
 169 }
 170
 171 static void setup_state_to_color(const char *state, const char **on, const char **off) {
 172         assert(on);
 173         assert(off);
 174
 175         if (streq_ptr(state, "configured")) {
 176                 *on = ansi_highlight_green();
 177                 *off = ansi_highlight_off();
 178         } else if (streq_ptr(state, "configuring")) {
 179                 *on = ansi_highlight_yellow();
 180                 *off = ansi_highlight_off();
 181         } else if (streq_ptr(state, "failed") || streq_ptr(state, "linger")) {
 182                 *on = ansi_highlight_red();
 183                 *off = ansi_highlight_off();
 184         } else
 185                 *on = *off = "";
 186 }
 187
 188 static int list_links(char **args, unsigned n) {
 189         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 190         _cleanup_udev_unref_ struct udev *udev = NULL;
 191         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
 192         _cleanup_free_ LinkInfo *links = NULL;
 193         int r, c, i;
 194
 195         pager_open_if_enabled();
 196
 197         r = sd_rtnl_open(&rtnl, 0);
 198         if (r < 0)
 199                 return log_error_errno(r, "Failed to connect to netlink: %m");
 200
 201         udev = udev_new();
 202         if (!udev)
 203                 return log_error_errno(errno, "Failed to connect to udev: %m");
 204
 205         r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
 206         if (r < 0)
 207                 return rtnl_log_create_error(r);
 208
 209         r = sd_rtnl_message_request_dump(req, true);
 210         if (r < 0)
 211                 return rtnl_log_create_error(r);
 212
 213         r = sd_rtnl_call(rtnl, req, 0, &reply);
 214         if (r < 0)
 215                 return log_error_errno(r, "Failed to enumerate links: %m");
 216
 217         if (arg_legend)
 218                 printf("%3s %-16s %-18s %-11s %-10s\n", "IDX", "LINK", "TYPE", "OPERATIONAL", "SETUP");
 219
 220         c = decode_and_sort_links(reply, &links);
 221         if (c < 0)
 222                 return rtnl_log_parse_error(c);
 223
 224         for (i = 0; i < c; i++) {
 225                 _cleanup_free_ char *setup_state = NULL, *operational_state = NULL;
 226                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 227                 const char *on_color_operational, *off_color_operational,
 228                            *on_color_setup, *off_color_setup;
 229                  char devid[2 + DECIMAL_STR_MAX(int)];
 230                 _cleanup_free_ char *t = NULL;
 231
 232                 sd_network_link_get_operational_state(links[i].ifindex, &operational_state);
 233                 operational_state_to_color(operational_state, &on_color_operational, &off_color_operational);
 234
 235                 sd_network_link_get_setup_state(links[i].ifindex, &setup_state);
 236                 setup_state_to_color(setup_state, &on_color_setup, &off_color_setup);
 237
 238                 sprintf(devid, "n%i", links[i].ifindex);
 239                 d = udev_device_new_from_device_id(udev, devid);
 240
 241                 link_get_type_string(links[i].iftype, d, &t);
 242
 243                 printf("%3i %-16s %-18s %s%-11s%s %s%-10s%s\n",
 244                        links[i].ifindex, links[i].name, strna(t),
 245                        on_color_operational, strna(operational_state), off_color_operational,
 246                        on_color_setup, strna(setup_state), off_color_setup);
 247         }
 248
 249         if (arg_legend)
 250                 printf("\n%i links listed.\n", c);
 251
 252         return 0;
 253 }
 254
 255 /* IEEE Organizationally Unique Identifier vendor string */
 256 static int ieee_oui(sd_hwdb *hwdb, struct ether_addr *mac, char **ret) {
 257         const char *description;
 258         char modalias[strlen("OUI:XXYYXXYYXXYY") + 1], *desc;
 259         int r;
 260
 261         assert(ret);
 262
 263         if (!hwdb)
 264                 return -EINVAL;
 265
 266         if (!mac)
 267                 return -EINVAL;
 268
 269         /* skip commonly misused 00:00:00 (Xerox) prefix */
 270         if (memcmp(mac, "\0\0\0", 3) == 0)
 271                 return -EINVAL;
 272
 273         snprintf(modalias, sizeof(modalias), "OUI:" ETHER_ADDR_FORMAT_STR, ETHER_ADDR_FORMAT_VAL(*mac));
 274
 275         r = sd_hwdb_get(hwdb, modalias, "ID_OUI_FROM_DATABASE", &description);
 276         if (r < 0)
 277                 return r;
 278
 279         desc = strdup(description);
 280         if (!desc)
 281                 return -ENOMEM;
 282
 283         *ret = desc;
 284
 285         return 0;
 286 }
 287
 288 static int get_gateway_description(
 289                 sd_rtnl *rtnl,
 290                 sd_hwdb *hwdb,
 291                 int ifindex,
 292                 int family,
 293                 union in_addr_union *gateway,
 294                 char **gateway_description) {
 295         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 296         sd_rtnl_message *m;
 297         int r;
 298
 299         assert(rtnl);
 300         assert(ifindex >= 0);
 301         assert(family == AF_INET || family == AF_INET6);
 302         assert(gateway);
 303         assert(gateway_description);
 304
 305         r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_GETNEIGH, ifindex, family);
 306         if (r < 0)
 307                 return r;
 308
 309         r = sd_rtnl_message_request_dump(req, true);
 310         if (r < 0)
 311                 return r;
 312
 313         r = sd_rtnl_call(rtnl, req, 0, &reply);
 314         if (r < 0)
 315                 return r;
 316
 317         for (m = reply; m; m = sd_rtnl_message_next(m)) {
 318                 union in_addr_union gw = {};
 319                 struct ether_addr mac = {};
 320                 uint16_t type;
 321                 int ifi, fam;
 322
 323                 r = sd_rtnl_message_get_errno(m);
 324                 if (r < 0) {
 325                         log_error_errno(r, "got error: %m");
 326                         continue;
 327                 }
 328
 329                 r = sd_rtnl_message_get_type(m, &type);
 330                 if (r < 0) {
 331                         log_error_errno(r, "could not get type: %m");
 332                         continue;
 333                 }
 334
 335                 if (type != RTM_NEWNEIGH) {
 336                         log_error("type is not RTM_NEWNEIGH");
 337                         continue;
 338                 }
 339
 340                 r = sd_rtnl_message_neigh_get_family(m, &fam);
 341                 if (r < 0) {
 342                         log_error_errno(r, "could not get family: %m");
 343                         continue;
 344                 }
 345
 346                 if (fam != family) {
 347                         log_error("family is not correct");
 348                         continue;
 349                 }
 350
 351                 r = sd_rtnl_message_neigh_get_ifindex(m, &ifi);
 352                 if (r < 0) {
 353                         log_error_errno(r, "could not get ifindex: %m");
 354                         continue;
 355                 }
 356
 357                 if (ifindex > 0 && ifi != ifindex)
 358                         continue;
 359
 360                 switch (fam) {
 361                 case AF_INET:
 362                         r = sd_rtnl_message_read_in_addr(m, NDA_DST, &gw.in);
 363                         if (r < 0)
 364                                 continue;
 365
 366                         break;
 367                 case AF_INET6:
 368                         r = sd_rtnl_message_read_in6_addr(m, NDA_DST, &gw.in6);
 369                         if (r < 0)
 370                                 continue;
 371
 372                         break;
 373                 default:
 374                         continue;
 375                 }
 376
 377                 if (!in_addr_equal(fam, &gw, gateway))
 378                         continue;
 379
 380                 r = sd_rtnl_message_read_ether_addr(m, NDA_LLADDR, &mac);
 381                 if (r < 0)
 382                         continue;
 383
 384                 r = ieee_oui(hwdb, &mac, gateway_description);
 385                 if (r < 0)
 386                         continue;
 387
 388                 return 0;
 389         }
 390
 391         return -ENODATA;
 392 }
 393
 394 static int dump_gateways(
 395                 sd_rtnl *rtnl,
 396                 sd_hwdb *hwdb,
 397                 const char *prefix,
 398                 int ifindex) {
 399         _cleanup_free_ struct local_address *local = NULL;
 400         int r, n, i;
 401
 402         n = local_gateways(rtnl, ifindex, AF_UNSPEC, &local);
 403         if (n < 0)
 404                 return n;
 405
 406         for (i = 0; i < n; i++) {
 407                 _cleanup_free_ char *gateway = NULL, *description = NULL;
 408
 409                 r = in_addr_to_string(local[i].family, &local[i].address, &gateway);
 410                 if (r < 0)
 411                         return r;
 412
 413                 r = get_gateway_description(rtnl, hwdb, local[i].ifindex, local[i].family, &local[i].address, &description);
 414                 if (r < 0)
 415                         log_debug_errno(r, "Could not get description of gateway: %m");
 416
 417                 printf("%*s%s",
 418                        (int) strlen(prefix),
 419                        i == 0 ? prefix : "",
 420                        gateway);
 421
 422                 if (description)
 423                         printf(" (%s)", description);
 424
 425                 /* Show interface name for the entry if we show
 426                  * entries for all interfaces */
 427                 if (ifindex <= 0) {
 428                         char name[IF_NAMESIZE+1];
 429
 430                         if (if_indextoname(local[i].ifindex, name)) {
 431                                 fputs(" on ", stdout);
 432                                 fputs(name, stdout);
 433                         } else
 434                                 printf(" on %%%i", local[i].ifindex);
 435                 }
 436
 437                 fputc('\n', stdout);
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int dump_addresses(
 444                 sd_rtnl *rtnl,
 445                 const char *prefix,
 446                 int ifindex) {
 447
 448         _cleanup_free_ struct local_address *local = NULL;
 449         int r, n, i;
 450
 451         n = local_addresses(rtnl, ifindex, AF_UNSPEC, &local);
 452         if (n < 0)
 453                 return n;
 454
 455         for (i = 0; i < n; i++) {
 456                 _cleanup_free_ char *pretty = NULL;
 457
 458                 r = in_addr_to_string(local[i].family, &local[i].address, &pretty);
 459                 if (r < 0)
 460                         return r;
 461
 462                 printf("%*s%s",
 463                        (int) strlen(prefix),
 464                        i == 0 ? prefix : "",
 465                        pretty);
 466
 467                 if (ifindex <= 0) {
 468                         char name[IF_NAMESIZE+1];
 469
 470                         if (if_indextoname(local[i].ifindex, name)) {
 471                                 fputs(" on ", stdout);
 472                                 fputs(name, stdout);
 473                         } else
 474                                 printf(" on %%%i", local[i].ifindex);
 475                 }
 476
 477                 fputc('\n', stdout);
 478         }
 479
 480         return 0;
 481 }
 482
 483 static void dump_list(const char *prefix, char **l) {
 484         char **i;
 485
 486         STRV_FOREACH(i, l) {
 487                 printf("%*s%s\n",
 488                        (int) strlen(prefix),
 489                        i == l ? prefix : "",
 490                        *i);
 491         }
 492 }
 493
 494 static int link_status_one(
 495                 sd_rtnl *rtnl,
 496                 struct udev *udev,
 497                 sd_hwdb *hwdb,
 498                 const char *name) {
 499
 500         _cleanup_strv_free_ char **dns = NULL, **ntp = NULL, **domains = NULL;
 501         _cleanup_free_ char *setup_state = NULL, *operational_state = NULL;
 502         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 503         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 504         char devid[2 + DECIMAL_STR_MAX(int)];
 505         _cleanup_free_ char *t = NULL, *network = NULL;
 506         const char *driver = NULL, *path = NULL, *vendor = NULL, *model = NULL, *link = NULL;
 507         const char *on_color_operational, *off_color_operational,
 508                    *on_color_setup, *off_color_setup;
 509         struct ether_addr e;
 510         unsigned iftype;
 511         int r, ifindex;
 512         bool have_mac;
 513         uint32_t mtu;
 514
 515         assert(rtnl);
 516         assert(udev);
 517         assert(name);
 518
 519         if (safe_atoi(name, &ifindex) >= 0 && ifindex > 0)
 520                 r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, ifindex);
 521         else {
 522                 r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
 523                 if (r < 0)
 524                         return rtnl_log_create_error(r);
 525
 526                 r = sd_rtnl_message_append_string(req, IFLA_IFNAME, name);
 527         }
 528
 529         if (r < 0)
 530                 return rtnl_log_create_error(r);
 531
 532         r = sd_rtnl_call(rtnl, req, 0, &reply);
 533         if (r < 0)
 534                 return log_error_errno(r, "Failed to query link: %m");
 535
 536         r = sd_rtnl_message_link_get_ifindex(reply, &ifindex);
 537         if (r < 0)
 538                 return rtnl_log_parse_error(r);
 539
 540         r = sd_rtnl_message_read_string(reply, IFLA_IFNAME, &name);
 541         if (r < 0)
 542                 return rtnl_log_parse_error(r);
 543
 544         r = sd_rtnl_message_link_get_type(reply, &iftype);
 545         if (r < 0)
 546                 return rtnl_log_parse_error(r);
 547
 548         have_mac = sd_rtnl_message_read_ether_addr(reply, IFLA_ADDRESS, &e) >= 0;
 549
 550         if (have_mac) {
 551                 const uint8_t *p;
 552                 bool all_zeroes = true;
 553
 554                 for (p = (uint8_t*) &e; p < (uint8_t*) &e + sizeof(e); p++)
 555                         if (*p != 0) {
 556                                 all_zeroes = false;
 557                                 break;
 558                         }
 559
 560                 if (all_zeroes)
 561                         have_mac = false;
 562         }
 563
 564         sd_rtnl_message_read_u32(reply, IFLA_MTU, &mtu);
 565
 566         sd_network_link_get_operational_state(ifindex, &operational_state);
 567         operational_state_to_color(operational_state, &on_color_operational, &off_color_operational);
 568
 569         sd_network_link_get_setup_state(ifindex, &setup_state);
 570         setup_state_to_color(setup_state, &on_color_setup, &off_color_setup);
 571
 572         sd_network_link_get_dns(ifindex, &dns);
 573         sd_network_link_get_ntp(ifindex, &ntp);
 574         sd_network_link_get_domains(ifindex, &domains);
 575         r = sd_network_link_get_wildcard_domain(ifindex);
 576         if (r > 0) {
 577                 char *wildcard;
 578
 579                 wildcard = strdup("*");
 580                 if (!wildcard)
 581                         return log_oom();
 582
 583                 if (strv_consume(&domains, wildcard) < 0)
 584                         return log_oom();
 585         }
 586
 587         sprintf(devid, "n%i", ifindex);
 588         d = udev_device_new_from_device_id(udev, devid);
 589         if (d) {
 590                 link = udev_device_get_property_value(d, "ID_NET_LINK_FILE");
 591                 driver = udev_device_get_property_value(d, "ID_NET_DRIVER");
 592                 path = udev_device_get_property_value(d, "ID_PATH");
 593
 594                 vendor = udev_device_get_property_value(d, "ID_VENDOR_FROM_DATABASE");
 595                 if (!vendor)
 596                         vendor = udev_device_get_property_value(d, "ID_VENDOR");
 597
 598                 model = udev_device_get_property_value(d, "ID_MODEL_FROM_DATABASE");
 599                 if (!model)
 600                         model = udev_device_get_property_value(d, "ID_MODEL");
 601         }
 602
 603         link_get_type_string(iftype, d, &t);
 604
 605         sd_network_link_get_network_file(ifindex, &network);
 606
 607         printf("%s%s%s %i: %s\n", on_color_operational, draw_special_char(DRAW_BLACK_CIRCLE), off_color_operational, ifindex, name);
 608
 609         printf("   Link File: %s\n"
 610                "Network File: %s\n"
 611                "        Type: %s\n"
 612                "       State: %s%s%s (%s%s%s)\n",
 613                strna(link),
 614                strna(network),
 615                strna(t),
 616                on_color_operational, strna(operational_state), off_color_operational,
 617                on_color_setup, strna(setup_state), off_color_setup);
 618
 619         if (path)
 620                 printf("        Path: %s\n", path);
 621         if (driver)
 622                 printf("      Driver: %s\n", driver);
 623         if (vendor)
 624                 printf("      Vendor: %s\n", vendor);
 625         if (model)
 626                 printf("       Model: %s\n", model);
 627
 628         if (have_mac) {
 629                 _cleanup_free_ char *description = NULL;
 630                 char ea[ETHER_ADDR_TO_STRING_MAX];
 631
 632                 ieee_oui(hwdb, &e, &description);
 633
 634                 if (description)
 635                         printf("  HW Address: %s (%s)\n", ether_addr_to_string(&e, ea), description);
 636                 else
 637                         printf("  HW Address: %s\n", ether_addr_to_string(&e, ea));
 638         }
 639
 640         if (mtu > 0)
 641                 printf("         MTU: %u\n", mtu);
 642
 643         dump_addresses(rtnl, "     Address: ", ifindex);
 644         dump_gateways(rtnl, hwdb, "     Gateway: ", ifindex);
 645
 646         if (!strv_isempty(dns))
 647                 dump_list("         DNS: ", dns);
 648         if (!strv_isempty(domains))
 649                 dump_list("      Domain: ", domains);
 650         if (!strv_isempty(ntp))
 651                 dump_list("         NTP: ", ntp);
 652
 653         return 0;
 654 }
 655
 656 static int link_status(char **args, unsigned n) {
 657         _cleanup_hwdb_unref_ sd_hwdb *hwdb = NULL;
 658         _cleanup_udev_unref_ struct udev *udev = NULL;
 659         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
 660         char **name;
 661         int r;
 662
 663         r = sd_rtnl_open(&rtnl, 0);
 664         if (r < 0)
 665                 return log_error_errno(r, "Failed to connect to netlink: %m");
 666
 667         udev = udev_new();
 668         if (!udev)
 669                 return log_error_errno(errno, "Failed to connect to udev: %m");
 670
 671         r = sd_hwdb_new(&hwdb);
 672         if (r < 0)
 673                 log_debug_errno(r, "Failed to open hardware database: %m");
 674
 675         if (n <= 1 && !arg_all) {
 676                 _cleanup_free_ char *operational_state = NULL;
 677                 _cleanup_strv_free_ char **dns = NULL, **ntp = NULL, **domains = NULL;
 678                 const char *on_color_operational, *off_color_operational;
 679
 680                 sd_network_get_operational_state(&operational_state);
 681                 operational_state_to_color(operational_state, &on_color_operational, &off_color_operational);
 682
 683                 printf("%s%s%s      State: %s%s%s\n",
 684                        on_color_operational, draw_special_char(DRAW_BLACK_CIRCLE), off_color_operational,
 685                        on_color_operational, strna(operational_state), off_color_operational);
 686
 687                 dump_addresses(rtnl, "     Address: ", 0);
 688                 dump_gateways(rtnl, hwdb, "     Gateway: ", 0);
 689
 690                 sd_network_get_dns(&dns);
 691                 if (!strv_isempty(dns))
 692                         dump_list("         DNS: ", dns);
 693
 694                 sd_network_get_domains(&domains);
 695                 if (!strv_isempty(domains))
 696                         dump_list("      Domain: ", domains);
 697
 698                 sd_network_get_ntp(&ntp);
 699                 if (!strv_isempty(ntp))
 700                         dump_list("         NTP: ", ntp);
 701
 702                 return 0;
 703         }
 704
 705         pager_open_if_enabled();
 706
 707         if (arg_all) {
 708                 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 709                 _cleanup_free_ LinkInfo *links = NULL;
 710                 int c, i;
 711
 712                 r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
 713                 if (r < 0)
 714                         return rtnl_log_create_error(r);
 715
 716                 r = sd_rtnl_message_request_dump(req, true);
 717                 if (r < 0)
 718                         return rtnl_log_create_error(r);
 719
 720                 r = sd_rtnl_call(rtnl, req, 0, &reply);
 721                 if (r < 0)
 722                         return log_error_errno(r, "Failed to enumerate links: %m");
 723
 724                 c = decode_and_sort_links(reply, &links);
 725                 if (c < 0)
 726                         return rtnl_log_parse_error(c);
 727
 728                 for (i = 0; i < c; i++) {
 729                         if (i > 0)
 730                                 fputc('\n', stdout);
 731
 732                         link_status_one(rtnl, udev, hwdb, links[i].name);
 733                 }
 734         } else {
 735                 STRV_FOREACH(name, args + 1) {
 736                         if (name != args+1)
 737                                 fputc('\n', stdout);
 738
 739                         link_status_one(rtnl, udev, hwdb, *name);
 740                 }
 741         }
 742
 743         return 0;
 744 }
 745
 746 static void help(void) {
 747         printf("%s [OPTIONS...]\n\n"
 748                "Query and control the networking subsystem.\n\n"
 749                "  -h --help             Show this help\n"
 750                "     --version          Show package version\n"
 751                "     --no-pager         Do not pipe output into a pager\n"
 752                "     --no-legend        Do not show the headers and footers\n"
 753                "  -a --all              Show status for all links\n\n"
 754                "Commands:\n"
 755                "  list                  List links\n"
 756                "  status LINK           Show link status\n"
 757                , program_invocation_short_name);
 758 }
 759
 760 static int parse_argv(int argc, char *argv[]) {
 761
 762         enum {
 763                 ARG_VERSION = 0x100,
 764                 ARG_NO_PAGER,
 765                 ARG_NO_LEGEND,
 766         };
 767
 768         static const struct option options[] = {
 769                 { "help",      no_argument,       NULL, 'h'           },
 770                 { "version",   no_argument,       NULL, ARG_VERSION   },
 771                 { "no-pager",  no_argument,       NULL, ARG_NO_PAGER  },
 772                 { "no-legend", no_argument,       NULL, ARG_NO_LEGEND },
 773                 { "all",       no_argument,       NULL, 'a'           },
 774                 {}
 775         };
 776
 777         int c;
 778
 779         assert(argc >= 0);
 780         assert(argv);
 781
 782         while ((c = getopt_long(argc, argv, "ha", options, NULL)) >= 0) {
 783
 784                 switch (c) {
 785
 786                 case 'h':
 787                         help();
 788                         return 0;
 789
 790                 case ARG_VERSION:
 791                         puts(PACKAGE_STRING);
 792                         puts(SYSTEMD_FEATURES);
 793                         return 0;
 794
 795                 case ARG_NO_PAGER:
 796                         arg_no_pager = true;
 797                         break;
 798
 799                 case ARG_NO_LEGEND:
 800                         arg_legend = false;
 801                         break;
 802
 803                 case 'a':
 804                         arg_all = true;
 805                         break;
 806
 807                 case '?':
 808                         return -EINVAL;
 809
 810                 default:
 811                         assert_not_reached("Unhandled option");
 812                 }
 813         }
 814
 815         return 1;
 816 }
 817
 818 static int networkctl_main(int argc, char *argv[]) {
 819
 820         static const struct {
 821                 const char* verb;
 822                 const enum {
 823                         MORE,
 824                         LESS,
 825                         EQUAL
 826                 } argc_cmp;
 827                 const int argc;
 828                 int (* const dispatch)(char **args, unsigned n);
 829         } verbs[] = {
 830                 { "list",   LESS, 1, list_links  },
 831                 { "status", MORE, 1, link_status },
 832         };
 833
 834         int left;
 835         unsigned i;
 836
 837         assert(argc >= 0);
 838         assert(argv);
 839
 840         left = argc - optind;
 841
 842         if (left <= 0)
 843                 /* Special rule: no arguments means "list" */
 844                 i = 0;
 845         else {
 846                 if (streq(argv[optind], "help")) {
 847                         help();
 848                         return 0;
 849                 }
 850
 851                 for (i = 0; i < ELEMENTSOF(verbs); i++)
 852                         if (streq(argv[optind], verbs[i].verb))
 853                                 break;
 854
 855                 if (i >= ELEMENTSOF(verbs)) {
 856                         log_error("Unknown operation %s", argv[optind]);
 857                         return -EINVAL;
 858                 }
 859         }
 860
 861         switch (verbs[i].argc_cmp) {
 862
 863         case EQUAL:
 864                 if (left != verbs[i].argc) {
 865                         log_error("Invalid number of arguments.");
 866                         return -EINVAL;
 867                 }
 868
 869                 break;
 870
 871         case MORE:
 872                 if (left < verbs[i].argc) {
 873                         log_error("Too few arguments.");
 874                         return -EINVAL;
 875                 }
 876
 877                 break;
 878
 879         case LESS:
 880                 if (left > verbs[i].argc) {
 881                         log_error("Too many arguments.");
 882                         return -EINVAL;
 883                 }
 884
 885                 break;
 886
 887         default:
 888                 assert_not_reached("Unknown comparison operator.");
 889         }
 890
 891         return verbs[i].dispatch(argv + optind, left);
 892 }
 893
 894 int main(int argc, char* argv[]) {
 895         int r;
 896
 897         log_parse_environment();
 898         log_open();
 899
 900         r = parse_argv(argc, argv);
 901         if (r <= 0)
 902                 goto finish;
 903
 904         r = networkctl_main(argc, argv);
 905
 906 finish:
 907         pager_close();
 908
 909         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 910 }