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
  25 #include "sd-network.h"
  26 #include "sd-rtnl.h"
  27 #include "libudev.h"
  28
  29 #include "build.h"
  30 #include "util.h"
  31 #include "pager.h"
  32 #include "rtnl-util.h"
  33 #include "udev-util.h"
  34 #include "arphrd-list.h"
  35 #include "local-addresses.h"
  36 #include "socket-util.h"
  37
  38 static bool arg_no_pager = false;
  39 static bool arg_legend = true;
  40 static bool arg_all = false;
  41
  42 static void pager_open_if_enabled(void) {
  43
  44         if (arg_no_pager)
  45                 return;
  46
  47         pager_open(false);
  48 }
  49
  50 static int link_get_type_string(int iftype, struct udev_device *d, char **ret) {
  51         const char *t;
  52         char *p;
  53
  54         if (iftype == ARPHRD_ETHER && d) {
  55                 const char *devtype, *id = NULL;
  56                 /* WLANs have iftype ARPHRD_ETHER, but we want
  57                  * to show a more useful type string for
  58                  * them */
  59
  60                 devtype = udev_device_get_devtype(d);
  61                 if (streq_ptr(devtype, "wlan"))
  62                         id = "wlan";
  63                 else if (streq_ptr(devtype, "wwan"))
  64                         id = "wwan";
  65
  66                 if (id) {
  67                         p = strdup(id);
  68                         if (!p)
  69                                 return -ENOMEM;
  70
  71                         *ret = p;
  72                         return 1;
  73                 }
  74         }
  75
  76         t = arphrd_to_name(iftype);
  77         if (!t) {
  78                 *ret = NULL;
  79                 return 0;
  80         }
  81
  82         p = strdup(t);
  83         if (!p)
  84                 return -ENOMEM;
  85
  86         ascii_strlower(p);
  87         *ret = p;
  88
  89         return 0;
  90 }
  91
  92 typedef struct LinkInfo {
  93         const char *name;
  94         int ifindex;
  95         unsigned iftype;
  96 } LinkInfo;
  97
  98 static int link_info_compare(const void *a, const void *b) {
  99         const LinkInfo *x = a, *y = b;
 100
 101         return x->ifindex - y->ifindex;
 102 }
 103
 104 static int decode_and_sort_links(sd_rtnl_message *m, LinkInfo **ret) {
 105         _cleanup_free_ LinkInfo *links = NULL;
 106         size_t size = 0, c = 0;
 107         sd_rtnl_message *i;
 108         int r;
 109
 110         for (i = m; i; i = sd_rtnl_message_next(i)) {
 111                 const char *name;
 112                 unsigned iftype;
 113                 uint16_t type;
 114                 int ifindex;
 115
 116                 r = sd_rtnl_message_get_type(i, &type);
 117                 if (r < 0)
 118                         return r;
 119
 120                 if (type != RTM_NEWLINK)
 121                         continue;
 122
 123                 r = sd_rtnl_message_link_get_ifindex(i, &ifindex);
 124                 if (r < 0)
 125                         return r;
 126
 127                 r = sd_rtnl_message_read_string(i, IFLA_IFNAME, &name);
 128                 if (r < 0)
 129                         return r;
 130
 131                 r = sd_rtnl_message_link_get_type(i, &iftype);
 132                 if (r < 0)
 133                         return r;
 134
 135                 if (!GREEDY_REALLOC(links, size, c+1))
 136                         return -ENOMEM;
 137
 138                 links[c].name = name;
 139                 links[c].ifindex = ifindex;
 140                 links[c].iftype = iftype;
 141                 c++;
 142         }
 143
 144         qsort(links, c, sizeof(LinkInfo), link_info_compare);
 145
 146         *ret = links;
 147         links = NULL;
 148
 149         return (int) c;
 150 }
 151
 152 static void operational_state_to_color(const char *state, const char **on, const char **off) {
 153         assert(on);
 154         assert(off);
 155
 156         if (streq_ptr(state, "routable")) {
 157                 *on = ansi_highlight_green();
 158                 *off = ansi_highlight_off();
 159         } else if (streq_ptr(state, "degraded")) {
 160                 *on = ansi_highlight_yellow();
 161                 *off = ansi_highlight_off();
 162         } else
 163                 *on = *off = "";
 164 }
 165
 166 static void setup_state_to_color(const char *state, const char **on, const char **off) {
 167         assert(on);
 168         assert(off);
 169
 170         if (streq_ptr(state, "configured")) {
 171                 *on = ansi_highlight_green();
 172                 *off = ansi_highlight_off();
 173         } else if (streq_ptr(state, "configuring")) {
 174                 *on = ansi_highlight_yellow();
 175                 *off = ansi_highlight_off();
 176         } else if (streq_ptr(state, "failed") || streq_ptr(state, "linger")) {
 177                 *on = ansi_highlight_red();
 178                 *off = ansi_highlight_off();
 179         } else
 180                 *on = *off = "";
 181 }
 182
 183 static int list_links(char **args, unsigned n) {
 184         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 185         _cleanup_udev_unref_ struct udev *udev = NULL;
 186         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
 187         _cleanup_free_ LinkInfo *links = NULL;
 188         int r, c, i;
 189
 190         pager_open_if_enabled();
 191
 192         r = sd_rtnl_open(&rtnl, 0);
 193         if (r < 0) {
 194                 log_error("Failed to connect to netlink: %s", strerror(-r));
 195                 return r;
 196         }
 197
 198         udev = udev_new();
 199         if (!udev) {
 200                 log_error("Failed to connect to udev: %m");
 201                 return -errno;
 202         }
 203
 204         r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
 205         if (r < 0)
 206                 return rtnl_log_create_error(r);
 207
 208         r = sd_rtnl_message_request_dump(req, true);
 209         if (r < 0)
 210                 return rtnl_log_create_error(r);
 211
 212         r = sd_rtnl_call(rtnl, req, 0, &reply);
 213         if (r < 0) {
 214                 log_error("Failed to enumerate links: %s", strerror(-r));
 215                 return r;
 216         }
 217
 218         if (arg_legend)
 219                 printf("%3s %-16s %-18s %-11s %-10s\n", "IDX", "LINK", "TYPE", "OPERATIONAL", "SETUP");
 220
 221         c = decode_and_sort_links(reply, &links);
 222         if (c < 0)
 223                 return rtnl_log_parse_error(c);
 224
 225         for (i = 0; i < c; i++) {
 226                 _cleanup_free_ char *setup_state = NULL, *operational_state = NULL;
 227                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 228                 const char *on_color_operational, *off_color_operational,
 229                            *on_color_setup, *off_color_setup;
 230                  char devid[2 + DECIMAL_STR_MAX(int)];
 231                 _cleanup_free_ char *t = NULL;
 232
 233                 sd_network_link_get_operational_state(links[i].ifindex, &operational_state);
 234                 operational_state_to_color(operational_state, &on_color_operational, &off_color_operational);
 235
 236                 sd_network_link_get_setup_state(links[i].ifindex, &setup_state);
 237                 setup_state_to_color(setup_state, &on_color_setup, &off_color_setup);
 238
 239                 sprintf(devid, "n%i", links[i].ifindex);
 240                 d = udev_device_new_from_device_id(udev, devid);
 241
 242                 link_get_type_string(links[i].iftype, d, &t);
 243
 244                 printf("%3i %-16s %-18s %s%-11s%s %s%-10s%s\n",
 245                        links[i].ifindex, links[i].name, strna(t),
 246                        on_color_operational, strna(operational_state), off_color_operational,
 247                        on_color_setup, strna(setup_state), off_color_setup);
 248         }
 249
 250         if (arg_legend)
 251                 printf("\n%i links listed.\n", c);
 252
 253         return 0;
 254 }
 255
 256 static int dump_addresses(sd_rtnl *rtnl, const char *prefix, int ifindex) {
 257         _cleanup_free_ struct local_address *local = NULL;
 258         int r, n, i;
 259
 260         n = local_addresses(rtnl, ifindex, &local);
 261         if (n < 0)
 262                 return n;
 263
 264         for (i = 0; i < n; i++) {
 265                 _cleanup_free_ char *pretty = NULL;
 266
 267                 r = in_addr_to_string(local[i].family, &local[i].address, &pretty);
 268                 if (r < 0)
 269                         return r;
 270
 271                 printf("%*s%s\n",
 272                        (int) strlen(prefix),
 273                        i == 0 ? prefix : "",
 274                        pretty);
 275         }
 276
 277         return 0;
 278 }
 279
 280 static void dump_list(const char *prefix, char **l) {
 281         char **i;
 282
 283         STRV_FOREACH(i, l) {
 284                 printf("%*s%s\n",
 285                        (int) strlen(prefix),
 286                        i == l ? prefix : "",
 287                        *i);
 288         }
 289 }
 290
 291 static int link_status_one(sd_rtnl *rtnl, struct udev *udev, const char *name) {
 292         _cleanup_strv_free_ char **dns = NULL, **ntp = NULL, **domains = NULL;
 293         _cleanup_free_ char *setup_state = NULL, *operational_state = NULL;
 294         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 295         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 296         char devid[2 + DECIMAL_STR_MAX(int)];
 297         _cleanup_free_ char *t = NULL;
 298         const char *driver = NULL, *path = NULL, *vendor = NULL, *model = NULL;
 299         const char *on_color_operational, *off_color_operational,
 300                    *on_color_setup, *off_color_setup;
 301         struct ether_addr e;
 302         unsigned iftype;
 303         int r, ifindex;
 304         bool have_mac;
 305         uint32_t mtu;
 306
 307         assert(rtnl);
 308         assert(udev);
 309         assert(name);
 310
 311         if (safe_atoi(name, &ifindex) >= 0 && ifindex > 0)
 312                 r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, ifindex);
 313         else {
 314                 r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
 315                 if (r < 0)
 316                         return rtnl_log_create_error(r);
 317
 318                 r = sd_rtnl_message_append_string(req, IFLA_IFNAME, name);
 319         }
 320
 321         if (r < 0)
 322                 return rtnl_log_create_error(r);
 323
 324         r = sd_rtnl_call(rtnl, req, 0, &reply);
 325         if (r < 0) {
 326                 log_error("Failed to query link: %s", strerror(-r));
 327                 return r;
 328         }
 329
 330         r = sd_rtnl_message_link_get_ifindex(reply, &ifindex);
 331         if (r < 0)
 332                 return rtnl_log_parse_error(r);
 333
 334         r = sd_rtnl_message_read_string(reply, IFLA_IFNAME, &name);
 335         if (r < 0)
 336                 return rtnl_log_parse_error(r);
 337
 338         r = sd_rtnl_message_link_get_type(reply, &iftype);
 339         if (r < 0)
 340                 return rtnl_log_parse_error(r);
 341
 342         have_mac = sd_rtnl_message_read_ether_addr(reply, IFLA_ADDRESS, &e) >= 0;
 343
 344         if (have_mac) {
 345                 const uint8_t *p;
 346                 bool all_zeroes = true;
 347
 348                 for (p = (uint8_t*) &e; p < (uint8_t*) &e + sizeof(e); p++)
 349                         if (*p != 0) {
 350                                 all_zeroes = false;
 351                                 break;
 352                         }
 353
 354                 if (all_zeroes)
 355                         have_mac = false;
 356         }
 357
 358         sd_rtnl_message_read_u32(reply, IFLA_MTU, &mtu);
 359
 360         sd_network_link_get_operational_state(ifindex, &operational_state);
 361         operational_state_to_color(operational_state, &on_color_operational, &off_color_operational);
 362
 363         sd_network_link_get_setup_state(ifindex, &setup_state);
 364         setup_state_to_color(setup_state, &on_color_setup, &off_color_setup);
 365
 366         sd_network_link_get_dns(ifindex, &dns);
 367         sd_network_link_get_ntp(ifindex, &ntp);
 368         sd_network_link_get_domains(ifindex, &domains);
 369         r = sd_network_link_get_wildcard_domain(ifindex);
 370         if (r > 0) {
 371                 char *wildcard;
 372
 373                 wildcard = strdup("*");
 374                 strv_push(&domains, wildcard);
 375         }
 376
 377         sprintf(devid, "n%i", ifindex);
 378         d = udev_device_new_from_device_id(udev, devid);
 379
 380         link_get_type_string(iftype, d, &t);
 381
 382         if (d) {
 383                 driver = udev_device_get_property_value(d, "ID_NET_DRIVER");
 384                 path = udev_device_get_property_value(d, "ID_PATH");
 385
 386                 vendor = udev_device_get_property_value(d, "ID_VENDOR_FROM_DATABASE");
 387                 if (!vendor)
 388                         vendor = udev_device_get_property_value(d, "ID_VENDOR");
 389
 390                 model = udev_device_get_property_value(d, "ID_MODEL_FROM_DATABASE");
 391                 if (!model)
 392                         model = udev_device_get_property_value(d, "ID_MODEL");
 393         }
 394
 395
 396         printf("%s%s%s %i: %s\n", on_color_operational, draw_special_char(DRAW_BLACK_CIRCLE), off_color_operational, ifindex, name);
 397
 398         printf("        Type: %s\n"
 399                "       State: %s%s%s (%s%s%s)\n",
 400                strna(t),
 401                on_color_operational, strna(operational_state), off_color_operational,
 402                on_color_setup, strna(setup_state), off_color_setup);
 403
 404         if (path)
 405                 printf("        Path: %s\n", path);
 406         if (driver)
 407                 printf("      Driver: %s\n", driver);
 408         if (vendor)
 409                 printf("      Vendor: %s\n", vendor);
 410         if (model)
 411                 printf("       Model: %s\n", model);
 412
 413         if (have_mac) {
 414                 char ea[ETHER_ADDR_TO_STRING_MAX];
 415                 printf("  HW Address: %s\n", ether_addr_to_string(&e, ea));
 416         }
 417
 418         if (mtu > 0)
 419                 printf("         MTU: %u\n", mtu);
 420
 421         dump_addresses(rtnl, "     Address: ", ifindex);
 422
 423         if (!strv_isempty(dns))
 424                 dump_list("         DNS: ", dns);
 425         if (!strv_isempty(domains))
 426                 dump_list("     Domains: ", domains);
 427         if (!strv_isempty(ntp))
 428                 dump_list("         NTP: ", ntp);
 429
 430         return 0;
 431 }
 432
 433 static int link_status(char **args, unsigned n) {
 434         _cleanup_udev_unref_ struct udev *udev = NULL;
 435         _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
 436         char **name;
 437         int r;
 438
 439         r = sd_rtnl_open(&rtnl, 0);
 440         if (r < 0) {
 441                 log_error("Failed to connect to netlink: %s", strerror(-r));
 442                 return r;
 443         }
 444
 445         udev = udev_new();
 446         if (!udev) {
 447                 log_error("Failed to connect to udev: %m");
 448                 return -errno;
 449         }
 450
 451         if (n <= 1 && !arg_all) {
 452                 _cleanup_free_ char *operational_state = NULL;
 453                 _cleanup_strv_free_ char **dns = NULL, **ntp = NULL;
 454                 _cleanup_free_ struct local_address *addresses = NULL;
 455                 const char *on_color_operational, *off_color_operational;
 456                 int i, c;
 457
 458                 sd_network_get_operational_state(&operational_state);
 459                 operational_state_to_color(operational_state, &on_color_operational, &off_color_operational);
 460
 461                 printf("       State: %s%s%s\n", on_color_operational, strna(operational_state), off_color_operational);
 462
 463                 c = local_addresses(rtnl, 0, &addresses);
 464                 for (i = 0; i < c; i++) {
 465                         _cleanup_free_ char *pretty = NULL;
 466
 467                         r = in_addr_to_string(addresses[i].family, &addresses[i].address, &pretty);
 468                         if (r < 0)
 469                                 return log_oom();
 470
 471                         printf("%13s %s\n",
 472                                i > 0 ? "" : "Address:", pretty);
 473                 }
 474
 475                 sd_network_get_dns(&dns);
 476                 if (!strv_isempty(dns))
 477                         dump_list("         DNS: ", dns);
 478
 479                 sd_network_get_dns(&ntp);
 480                 if (!strv_isempty(ntp))
 481                         dump_list("         NTP: ", ntp);
 482
 483                 return 0;
 484         }
 485
 486         pager_open_if_enabled();
 487
 488         if (arg_all) {
 489                 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
 490                 _cleanup_free_ LinkInfo *links = NULL;
 491                 int c, i;
 492
 493                 r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
 494                 if (r < 0)
 495                         return rtnl_log_create_error(r);
 496
 497                 r = sd_rtnl_message_request_dump(req, true);
 498                 if (r < 0)
 499                         return rtnl_log_create_error(r);
 500
 501                 r = sd_rtnl_call(rtnl, req, 0, &reply);
 502                 if (r < 0) {
 503                         log_error("Failed to enumerate links: %s", strerror(-r));
 504                         return r;
 505                 }
 506
 507                 c = decode_and_sort_links(reply, &links);
 508                 if (c < 0)
 509                         return rtnl_log_parse_error(c);
 510
 511                 for (i = 0; i < c; i++) {
 512                         if (i > 0)
 513                                 fputc('\n', stdout);
 514
 515                         link_status_one(rtnl, udev, links[i].name);
 516                 }
 517         }
 518
 519         STRV_FOREACH(name, args + 1) {
 520                 if (name != args+1)
 521                         fputc('\n', stdout);
 522
 523                 link_status_one(rtnl, udev, *name);
 524         }
 525
 526         return 0;
 527 }
 528
 529 static void help(void) {
 530         printf("%s [OPTIONS...]\n\n"
 531                "Query and control the networking subsystem.\n\n"
 532                "  -h --help             Show this help\n"
 533                "     --version          Show package version\n"
 534                "     --no-pager         Do not pipe output into a pager\n"
 535                "     --no-legend        Do not show the headers and footers\n"
 536                "  -a --all              Show status for all links\n\n"
 537                "Commands:\n"
 538                "  list                  List links\n"
 539                "  status LINK           Show link status\n"
 540                , program_invocation_short_name);
 541 }
 542
 543 static int parse_argv(int argc, char *argv[]) {
 544
 545         enum {
 546                 ARG_VERSION = 0x100,
 547                 ARG_NO_PAGER,
 548                 ARG_NO_LEGEND,
 549         };
 550
 551         static const struct option options[] = {
 552                 { "help",      no_argument,       NULL, 'h'           },
 553                 { "version",   no_argument,       NULL, ARG_VERSION   },
 554                 { "no-pager",  no_argument,       NULL, ARG_NO_PAGER  },
 555                 { "no-legend", no_argument,       NULL, ARG_NO_LEGEND },
 556                 { "all",       no_argument,       NULL, 'a'           },
 557                 {}
 558         };
 559
 560         int c;
 561
 562         assert(argc >= 0);
 563         assert(argv);
 564
 565         while ((c = getopt_long(argc, argv, "ha", options, NULL)) >= 0) {
 566
 567                 switch (c) {
 568
 569                 case 'h':
 570                         help();
 571                         return 0;
 572
 573                 case ARG_VERSION:
 574                         puts(PACKAGE_STRING);
 575                         puts(SYSTEMD_FEATURES);
 576                         return 0;
 577
 578                 case ARG_NO_PAGER:
 579                         arg_no_pager = true;
 580                         break;
 581
 582                 case ARG_NO_LEGEND:
 583                         arg_legend = false;
 584                         break;
 585
 586                 case 'a':
 587                         arg_all = true;
 588                         break;
 589
 590                 case '?':
 591                         return -EINVAL;
 592
 593                 default:
 594                         assert_not_reached("Unhandled option");
 595                 }
 596         }
 597
 598         return 1;
 599 }
 600
 601 static int networkctl_main(int argc, char *argv[]) {
 602
 603         static const struct {
 604                 const char* verb;
 605                 const enum {
 606                         MORE,
 607                         LESS,
 608                         EQUAL
 609                 } argc_cmp;
 610                 const int argc;
 611                 int (* const dispatch)(char **args, unsigned n);
 612         } verbs[] = {
 613                 { "list",   LESS, 1, list_links  },
 614                 { "status", MORE, 1, link_status },
 615         };
 616
 617         int left;
 618         unsigned i;
 619
 620         assert(argc >= 0);
 621         assert(argv);
 622
 623         left = argc - optind;
 624
 625         if (left <= 0)
 626                 /* Special rule: no arguments means "list" */
 627                 i = 0;
 628         else {
 629                 if (streq(argv[optind], "help")) {
 630                         help();
 631                         return 0;
 632                 }
 633
 634                 for (i = 0; i < ELEMENTSOF(verbs); i++)
 635                         if (streq(argv[optind], verbs[i].verb))
 636                                 break;
 637
 638                 if (i >= ELEMENTSOF(verbs)) {
 639                         log_error("Unknown operation %s", argv[optind]);
 640                         return -EINVAL;
 641                 }
 642         }
 643
 644         switch (verbs[i].argc_cmp) {
 645
 646         case EQUAL:
 647                 if (left != verbs[i].argc) {
 648                         log_error("Invalid number of arguments.");
 649                         return -EINVAL;
 650                 }
 651
 652                 break;
 653
 654         case MORE:
 655                 if (left < verbs[i].argc) {
 656                         log_error("Too few arguments.");
 657                         return -EINVAL;
 658                 }
 659
 660                 break;
 661
 662         case LESS:
 663                 if (left > verbs[i].argc) {
 664                         log_error("Too many arguments.");
 665                         return -EINVAL;
 666                 }
 667
 668                 break;
 669
 670         default:
 671                 assert_not_reached("Unknown comparison operator.");
 672         }
 673
 674         return verbs[i].dispatch(argv + optind, left);
 675 }
 676
 677 int main(int argc, char* argv[]) {
 678         int r;
 679
 680         log_parse_environment();
 681         log_open();
 682
 683         r = parse_argv(argc, argv);
 684         if (r <= 0)
 685                 goto finish;
 686
 687         r = networkctl_main(argc, argv);
 688
 689 finish:
 690         pager_close();
 691
 692         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 693 }