src/journal/journalctl.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 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 <fcntl.h>
  23 #include <errno.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <sys/poll.h>
  30 #include <time.h>
  31 #include <getopt.h>
  32 #include <sys/stat.h>
  33 #include <sys/ioctl.h>
  34 #include <linux/fs.h>
  35
  36 #include <systemd/sd-journal.h>
  37
  38 #include "log.h"
  39 #include "util.h"
  40 #include "path-util.h"
  41 #include "build.h"
  42 #include "pager.h"
  43 #include "logs-show.h"
  44 #include "strv.h"
  45 #include "journal-internal.h"
  46 #include "journal-def.h"
  47 #include "journal-verify.h"
  48 #include "journal-authenticate.h"
  49 #include "journal-qrcode.h"
  50 #include "fsprg.h"
  51
  52 #define DEFAULT_FSS_INTERVAL_USEC (15*USEC_PER_MINUTE)
  53
  54 static OutputMode arg_output = OUTPUT_SHORT;
  55 static bool arg_follow = false;
  56 static bool arg_show_all = false;
  57 static bool arg_no_pager = false;
  58 static int arg_lines = -1;
  59 static bool arg_no_tail = false;
  60 static bool arg_quiet = false;
  61 static bool arg_local = false;
  62 static bool arg_this_boot = false;
  63 static const char *arg_directory = NULL;
  64 static int arg_priorities = 0xFF;
  65 static const char *arg_verify_key = NULL;
  66 #ifdef HAVE_GCRYPT
  67 static usec_t arg_interval = DEFAULT_FSS_INTERVAL_USEC;
  68 #endif
  69
  70 static enum {
  71         ACTION_SHOW,
  72         ACTION_NEW_ID128,
  73         ACTION_PRINT_HEADER,
  74         ACTION_SETUP_KEYS,
  75         ACTION_VERIFY
  76 } arg_action = ACTION_SHOW;
  77
  78 static int help(void) {
  79
  80         printf("%s [OPTIONS...] [MATCH]\n\n"
  81                "Send control commands to or query the journal.\n\n"
  82                "  -h --help              Show this help\n"
  83                "     --version           Show package version\n"
  84                "     --no-pager          Do not pipe output into a pager\n"
  85                "  -a --all               Show all fields, including long and unprintable\n"
  86                "  -f --follow            Follow journal\n"
  87                "  -n --lines=INTEGER     Journal entries to show\n"
  88                "     --no-tail           Show all lines, even in follow mode\n"
  89                "  -o --output=STRING     Change journal output mode (short, short-monotonic,\n"
  90                "                         verbose, export, json, cat)\n"
  91                "  -q --quiet             Don't show privilege warning\n"
  92                "  -l --local             Only local entries\n"
  93                "  -b --this-boot         Show data only from current boot\n"
  94                "  -D --directory=PATH    Show journal files from directory\n"
  95                "  -p --priority=RANGE    Show only messages within the specified priority range\n\n"
  96                "Commands:\n"
  97                "     --new-id128         Generate a new 128 Bit ID\n"
  98                "     --header            Show journal header information\n"
  99 #ifdef HAVE_GCRYPT
 100                "     --setup-keys        Generate new FSS key pair\n"
 101                "       --interval=TIME   Time interval for changing the FSS sealing key\n"
 102                "     --verify            Verify journal file consistency\n"
 103                "       --verify-key=KEY  Specify FSS verification key\n"
 104 #endif
 105                , program_invocation_short_name);
 106
 107         return 0;
 108 }
 109
 110 static int parse_argv(int argc, char *argv[]) {
 111
 112         enum {
 113                 ARG_VERSION = 0x100,
 114                 ARG_NO_PAGER,
 115                 ARG_NO_TAIL,
 116                 ARG_NEW_ID128,
 117                 ARG_HEADER,
 118                 ARG_SETUP_KEYS,
 119                 ARG_INTERVAL,
 120                 ARG_VERIFY,
 121                 ARG_VERIFY_KEY
 122         };
 123
 124         static const struct option options[] = {
 125                 { "help",         no_argument,       NULL, 'h'              },
 126                 { "version" ,     no_argument,       NULL, ARG_VERSION      },
 127                 { "no-pager",     no_argument,       NULL, ARG_NO_PAGER     },
 128                 { "follow",       no_argument,       NULL, 'f'              },
 129                 { "output",       required_argument, NULL, 'o'              },
 130                 { "all",          no_argument,       NULL, 'a'              },
 131                 { "lines",        required_argument, NULL, 'n'              },
 132                 { "no-tail",      no_argument,       NULL, ARG_NO_TAIL      },
 133                 { "new-id128",    no_argument,       NULL, ARG_NEW_ID128    },
 134                 { "quiet",        no_argument,       NULL, 'q'              },
 135                 { "local",        no_argument,       NULL, 'l'              },
 136                 { "this-boot",    no_argument,       NULL, 'b'              },
 137                 { "directory",    required_argument, NULL, 'D'              },
 138                 { "header",       no_argument,       NULL, ARG_HEADER       },
 139                 { "priority",     no_argument,       NULL, 'p'              },
 140                 { "setup-keys",   no_argument,       NULL, ARG_SETUP_KEYS   },
 141                 { "interval",     required_argument, NULL, ARG_INTERVAL     },
 142                 { "verify",       no_argument,       NULL, ARG_VERIFY       },
 143                 { "verify-key",   required_argument, NULL, ARG_VERIFY_KEY   },
 144                 { NULL,           0,                 NULL, 0                }
 145         };
 146
 147         int c, r;
 148
 149         assert(argc >= 0);
 150         assert(argv);
 151
 152         while ((c = getopt_long(argc, argv, "hfo:an:qlbD:p:", options, NULL)) >= 0) {
 153
 154                 switch (c) {
 155
 156                 case 'h':
 157                         help();
 158                         return 0;
 159
 160                 case ARG_VERSION:
 161                         puts(PACKAGE_STRING);
 162                         puts(DISTRIBUTION);
 163                         puts(SYSTEMD_FEATURES);
 164                         return 0;
 165
 166                 case ARG_NO_PAGER:
 167                         arg_no_pager = true;
 168                         break;
 169
 170                 case 'f':
 171                         arg_follow = true;
 172                         break;
 173
 174                 case 'o':
 175                         arg_output =  output_mode_from_string(optarg);
 176                         if (arg_output < 0) {
 177                                 log_error("Unknown output '%s'.", optarg);
 178                                 return -EINVAL;
 179                         }
 180
 181                         break;
 182
 183                 case 'a':
 184                         arg_show_all = true;
 185                         break;
 186
 187                 case 'n':
 188                         r = safe_atoi(optarg, &arg_lines);
 189                         if (r < 0 || arg_lines < 0) {
 190                                 log_error("Failed to parse lines '%s'", optarg);
 191                                 return -EINVAL;
 192                         }
 193                         break;
 194
 195                 case ARG_NO_TAIL:
 196                         arg_no_tail = true;
 197                         break;
 198
 199                 case ARG_NEW_ID128:
 200                         arg_action = ACTION_NEW_ID128;
 201                         break;
 202
 203                 case 'q':
 204                         arg_quiet = true;
 205                         break;
 206
 207                 case 'l':
 208                         arg_local = true;
 209                         break;
 210
 211                 case 'b':
 212                         arg_this_boot = true;
 213                         break;
 214
 215                 case 'D':
 216                         arg_directory = optarg;
 217                         break;
 218
 219                 case ARG_HEADER:
 220                         arg_action = ACTION_PRINT_HEADER;
 221                         break;
 222
 223                 case ARG_VERIFY:
 224                         arg_action = ACTION_VERIFY;
 225                         break;
 226
 227 #ifdef HAVE_GCRYPT
 228                 case ARG_SETUP_KEYS:
 229                         arg_action = ACTION_SETUP_KEYS;
 230                         break;
 231
 232
 233                 case ARG_VERIFY_KEY:
 234                         arg_action = ACTION_VERIFY;
 235                         arg_verify_key = optarg;
 236                         break;
 237
 238                 case ARG_INTERVAL:
 239                         r = parse_usec(optarg, &arg_interval);
 240                         if (r < 0 || arg_interval <= 0) {
 241                                 log_error("Failed to parse sealing key change interval: %s", optarg);
 242                                 return -EINVAL;
 243                         }
 244                         break;
 245 #else
 246                 case ARG_SETUP_KEYS:
 247                 case ARG_VERIFY_KEY:
 248                 case ARG_INTERVAL:
 249                         log_error("Forward-secure sealing not available.");
 250                         return -ENOTSUP;
 251 #endif
 252
 253                 case 'p': {
 254                         const char *dots;
 255
 256                         dots = strstr(optarg, "..");
 257                         if (dots) {
 258                                 char *a;
 259                                 int from, to, i;
 260
 261                                 /* a range */
 262                                 a = strndup(optarg, dots - optarg);
 263                                 if (!a)
 264                                         return log_oom();
 265
 266                                 from = log_level_from_string(a);
 267                                 to = log_level_from_string(dots + 2);
 268                                 free(a);
 269
 270                                 if (from < 0 || to < 0) {
 271                                         log_error("Failed to parse log level range %s", optarg);
 272                                         return -EINVAL;
 273                                 }
 274
 275                                 arg_priorities = 0;
 276
 277                                 if (from < to) {
 278                                         for (i = from; i <= to; i++)
 279                                                 arg_priorities |= 1 << i;
 280                                 } else {
 281                                         for (i = to; i <= from; i++)
 282                                                 arg_priorities |= 1 << i;
 283                                 }
 284
 285                         } else {
 286                                 int p, i;
 287
 288                                 p = log_level_from_string(optarg);
 289                                 if (p < 0) {
 290                                         log_error("Unknown log level %s", optarg);
 291                                         return -EINVAL;
 292                                 }
 293
 294                                 arg_priorities = 0;
 295
 296                                 for (i = 0; i <= p; i++)
 297                                         arg_priorities |= 1 << i;
 298                         }
 299
 300                         break;
 301                 }
 302
 303                 case '?':
 304                         return -EINVAL;
 305
 306                 default:
 307                         log_error("Unknown option code %c", c);
 308                         return -EINVAL;
 309                 }
 310         }
 311
 312         if (arg_follow && !arg_no_tail && arg_lines < 0)
 313                 arg_lines = 10;
 314
 315         return 1;
 316 }
 317
 318 static bool on_tty(void) {
 319         static int t = -1;
 320
 321         /* Note that this is invoked relatively early, before we start
 322          * the pager. That means the value we return reflects whether
 323          * we originally were started on a tty, not if we currently
 324          * are. But this is intended, since we want colour and so on
 325          * when run in our own pager. */
 326
 327         if (_unlikely_(t < 0))
 328                 t = isatty(STDOUT_FILENO) > 0;
 329
 330         return t;
 331 }
 332
 333 static int generate_new_id128(void) {
 334         sd_id128_t id;
 335         int r;
 336         unsigned i;
 337
 338         r = sd_id128_randomize(&id);
 339         if (r < 0) {
 340                 log_error("Failed to generate ID: %s", strerror(-r));
 341                 return r;
 342         }
 343
 344         printf("As string:\n"
 345                SD_ID128_FORMAT_STR "\n\n"
 346                "As UUID:\n"
 347                "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
 348                "As macro:\n"
 349               "#define MESSAGE_XYZ SD_ID128_MAKE(",
 350                SD_ID128_FORMAT_VAL(id),
 351                SD_ID128_FORMAT_VAL(id));
 352
 353         for (i = 0; i < 16; i++)
 354                 printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
 355
 356         fputs(")\n", stdout);
 357
 358         return 0;
 359 }
 360
 361 static int add_matches(sd_journal *j, char **args) {
 362         char **i;
 363         int r;
 364
 365         assert(j);
 366
 367         STRV_FOREACH(i, args) {
 368
 369                 if (streq(*i, "+"))
 370                         r = sd_journal_add_disjunction(j);
 371                 else if (path_is_absolute(*i)) {
 372                         char *p, *t = NULL;
 373                         const char *path;
 374                         struct stat st;
 375
 376                         p = canonicalize_file_name(*i);
 377                         path = p ? p : *i;
 378
 379                         if (stat(path, &st) < 0)  {
 380                                 free(p);
 381                                 log_error("Couldn't stat file: %m");
 382                                 return -errno;
 383                         }
 384
 385                         if (S_ISREG(st.st_mode) && (0111 & st.st_mode))
 386                                 t = strappend("_EXE=", path);
 387                         else if (S_ISCHR(st.st_mode))
 388                                 asprintf(&t, "_KERNEL_DEVICE=c%u:%u", major(st.st_rdev), minor(st.st_rdev));
 389                         else if (S_ISBLK(st.st_mode))
 390                                 asprintf(&t, "_KERNEL_DEVICE=b%u:%u", major(st.st_rdev), minor(st.st_rdev));
 391                         else {
 392                                 free(p);
 393                                 log_error("File is not a device node, regular file or is not executable: %s", *i);
 394                                 return -EINVAL;
 395                         }
 396
 397                         free(p);
 398
 399                         if (!t)
 400                                 return log_oom();
 401
 402                         r = sd_journal_add_match(j, t, 0);
 403                         free(t);
 404                 } else
 405                         r = sd_journal_add_match(j, *i, 0);
 406
 407                 if (r < 0) {
 408                         log_error("Failed to add match '%s': %s", *i, strerror(-r));
 409                         return r;
 410                 }
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int add_this_boot(sd_journal *j) {
 417         char match[9+32+1] = "_BOOT_ID=";
 418         sd_id128_t boot_id;
 419         int r;
 420
 421         assert(j);
 422
 423         if (!arg_this_boot)
 424                 return 0;
 425
 426         r = sd_id128_get_boot(&boot_id);
 427         if (r < 0) {
 428                 log_error("Failed to get boot id: %s", strerror(-r));
 429                 return r;
 430         }
 431
 432         sd_id128_to_string(boot_id, match + 9);
 433         r = sd_journal_add_match(j, match, strlen(match));
 434         if (r < 0) {
 435                 log_error("Failed to add match: %s", strerror(-r));
 436                 return r;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int add_priorities(sd_journal *j) {
 443         char match[] = "PRIORITY=0";
 444         int i, r;
 445
 446         assert(j);
 447
 448         if (arg_priorities == 0xFF)
 449                 return 0;
 450
 451         for (i = LOG_EMERG; i <= LOG_DEBUG; i++)
 452                 if (arg_priorities & (1 << i)) {
 453                         match[sizeof(match)-2] = '0' + i;
 454
 455                         log_info("adding match %s", match);
 456
 457                         r = sd_journal_add_match(j, match, strlen(match));
 458                         if (r < 0) {
 459                                 log_error("Failed to add match: %s", strerror(-r));
 460                                 return r;
 461                         }
 462                 }
 463
 464         return 0;
 465 }
 466
 467 static int setup_keys(void) {
 468 #ifdef HAVE_GCRYPT
 469         size_t mpk_size, seed_size, state_size, i;
 470         uint8_t *mpk, *seed, *state;
 471         ssize_t l;
 472         int fd = -1, r, attr = 0;
 473         sd_id128_t machine, boot;
 474         char *p = NULL, *k = NULL;
 475         struct FSSHeader h;
 476         uint64_t n;
 477
 478         r = sd_id128_get_machine(&machine);
 479         if (r < 0) {
 480                 log_error("Failed to get machine ID: %s", strerror(-r));
 481                 return r;
 482         }
 483
 484         r = sd_id128_get_boot(&boot);
 485         if (r < 0) {
 486                 log_error("Failed to get boot ID: %s", strerror(-r));
 487                 return r;
 488         }
 489
 490         if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/fss",
 491                      SD_ID128_FORMAT_VAL(machine)) < 0)
 492                 return log_oom();
 493
 494         if (access(p, F_OK) >= 0) {
 495                 log_error("Sealing key file %s exists already.", p);
 496                 r = -EEXIST;
 497                 goto finish;
 498         }
 499
 500         if (asprintf(&k, "/var/log/journal/" SD_ID128_FORMAT_STR "/fss.tmp.XXXXXX",
 501                      SD_ID128_FORMAT_VAL(machine)) < 0) {
 502                 r = log_oom();
 503                 goto finish;
 504         }
 505
 506         mpk_size = FSPRG_mskinbytes(FSPRG_RECOMMENDED_SECPAR);
 507         mpk = alloca(mpk_size);
 508
 509         seed_size = FSPRG_RECOMMENDED_SEEDLEN;
 510         seed = alloca(seed_size);
 511
 512         state_size = FSPRG_stateinbytes(FSPRG_RECOMMENDED_SECPAR);
 513         state = alloca(state_size);
 514
 515         fd = open("/dev/random", O_RDONLY|O_CLOEXEC|O_NOCTTY);
 516         if (fd < 0) {
 517                 log_error("Failed to open /dev/random: %m");
 518                 r = -errno;
 519                 goto finish;
 520         }
 521
 522         log_info("Generating seed...");
 523         l = loop_read(fd, seed, seed_size, true);
 524         if (l < 0 || (size_t) l != seed_size) {
 525                 log_error("Failed to read random seed: %s", strerror(EIO));
 526                 r = -EIO;
 527                 goto finish;
 528         }
 529
 530         log_info("Generating key pair...");
 531         FSPRG_GenMK(NULL, mpk, seed, seed_size, FSPRG_RECOMMENDED_SECPAR);
 532
 533         log_info("Generating sealing key...");
 534         FSPRG_GenState0(state, mpk, seed, seed_size);
 535
 536         assert(arg_interval > 0);
 537
 538         n = now(CLOCK_REALTIME);
 539         n /= arg_interval;
 540
 541         close_nointr_nofail(fd);
 542         fd = mkostemp(k, O_WRONLY|O_CLOEXEC|O_NOCTTY);
 543         if (fd < 0) {
 544                 log_error("Failed to open %s: %m", k);
 545                 r = -errno;
 546                 goto finish;
 547         }
 548
 549         /* Enable secure remove, exclusion from dump, synchronous
 550          * writing and in-place updating */
 551         if (ioctl(fd, FS_IOC_GETFLAGS, &attr) < 0)
 552                 log_warning("FS_IOC_GETFLAGS failed: %m");
 553
 554         attr |= FS_SECRM_FL|FS_NODUMP_FL|FS_SYNC_FL|FS_NOCOW_FL;
 555
 556         if (ioctl(fd, FS_IOC_SETFLAGS, &attr) < 0)
 557                 log_warning("FS_IOC_SETFLAGS failed: %m");
 558
 559         zero(h);
 560         memcpy(h.signature, "KSHHRHLP", 8);
 561         h.machine_id = machine;
 562         h.boot_id = boot;
 563         h.header_size = htole64(sizeof(h));
 564         h.start_usec = htole64(n * arg_interval);
 565         h.interval_usec = htole64(arg_interval);
 566         h.fsprg_secpar = htole16(FSPRG_RECOMMENDED_SECPAR);
 567         h.fsprg_state_size = htole64(state_size);
 568
 569         l = loop_write(fd, &h, sizeof(h), false);
 570         if (l < 0 || (size_t) l != sizeof(h)) {
 571                 log_error("Failed to write header: %s", strerror(EIO));
 572                 r = -EIO;
 573                 goto finish;
 574         }
 575
 576         l = loop_write(fd, state, state_size, false);
 577         if (l < 0 || (size_t) l != state_size) {
 578                 log_error("Failed to write state: %s", strerror(EIO));
 579                 r = -EIO;
 580                 goto finish;
 581         }
 582
 583         if (link(k, p) < 0) {
 584                 log_error("Failed to link file: %m");
 585                 r = -errno;
 586                 goto finish;
 587         }
 588
 589         if (isatty(STDOUT_FILENO)) {
 590                 fprintf(stderr,
 591                         "\n"
 592                         "The new key pair has been generated. The " ANSI_HIGHLIGHT_ON "secret sealing key" ANSI_HIGHLIGHT_OFF " has been written to\n"
 593                         "the following local file. It should not be used on multiple hosts.\n"
 594                         "\n"
 595                         "\t%s\n"
 596                         "\n"
 597                         "Please write down the following " ANSI_HIGHLIGHT_ON "secret verification key" ANSI_HIGHLIGHT_OFF ". It should be stored\n"
 598                         "at a safe location and should not be saved locally on disk.\n"
 599                         "\n\t" ANSI_HIGHLIGHT_RED_ON, p);
 600                 fflush(stderr);
 601         }
 602         for (i = 0; i < seed_size; i++) {
 603                 if (i > 0 && i % 3 == 0)
 604                         putchar('-');
 605                 printf("%02x", ((uint8_t*) seed)[i]);
 606         }
 607
 608         printf("/%llx-%llx\n", (unsigned long long) n, (unsigned long long) arg_interval);
 609
 610         if (isatty(STDOUT_FILENO)) {
 611                 char tsb[FORMAT_TIMESPAN_MAX], *hn;
 612
 613                 fprintf(stderr,
 614                         ANSI_HIGHLIGHT_OFF "\n"
 615                         "The sealing key is automatically changed every %s.\n",
 616                         format_timespan(tsb, sizeof(tsb), arg_interval));
 617
 618                 hn = gethostname_malloc();
 619
 620                 if (hn) {
 621                         hostname_cleanup(hn);
 622                         fprintf(stderr, "The keys have been generated for host %s (" SD_ID128_FORMAT_STR ").\n", hn, SD_ID128_FORMAT_VAL(machine));
 623                 } else
 624                         fprintf(stderr, "The keys have been generated for host " SD_ID128_FORMAT_STR ".\n", SD_ID128_FORMAT_VAL(machine));
 625
 626 #ifdef HAVE_QRENCODE
 627                 fputc('\n', stderr);
 628                 print_qr_code(stderr, seed, seed_size, n, arg_interval, hn, machine);
 629 #endif
 630                 free(hn);
 631         }
 632
 633         r = 0;
 634
 635 finish:
 636         if (fd >= 0)
 637                 close_nointr_nofail(fd);
 638
 639         if (k) {
 640                 unlink(k);
 641                 free(k);
 642         }
 643
 644         free(p);
 645
 646         return r;
 647 #else
 648         log_error("Forward-secure sealing not available.");
 649         return -ENOTSUP;
 650 #endif
 651 }
 652
 653 static int verify(sd_journal *j) {
 654         int r = 0;
 655         Iterator i;
 656         JournalFile *f;
 657
 658         assert(j);
 659
 660         HASHMAP_FOREACH(f, j->files, i) {
 661                 int k;
 662                 usec_t from, to, total;
 663
 664 #ifdef HAVE_GCRYPT
 665                 if (!arg_verify_key && JOURNAL_HEADER_SEALED(f->header))
 666                         log_warning("Journal file %s has sealing enabled but verification key has not been passed using --verify-key=.", f->path);
 667 #endif
 668
 669                 k = journal_file_verify(f, arg_verify_key, &from, &to, &total, true);
 670                 if (k == -EINVAL) {
 671                         /* If the key was invalid give up right-away. */
 672                         return k;
 673                 } else if (k < 0) {
 674                         log_warning("FAIL: %s (%s)", f->path, strerror(-k));
 675                         r = k;
 676                 } else {
 677                         char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX], c[FORMAT_TIMESPAN_MAX];
 678                         log_info("PASS: %s", f->path);
 679
 680                         if (arg_verify_key && JOURNAL_HEADER_SEALED(f->header))
 681                                 log_info("=> Validated from %s to %s, %s missing",
 682                                          format_timestamp(a, sizeof(a), from),
 683                                          format_timestamp(b, sizeof(b), to),
 684                                          format_timespan(c, sizeof(c), total > to ? total - to : 0));
 685                 }
 686         }
 687
 688         return r;
 689 }
 690
 691 int main(int argc, char *argv[]) {
 692         int r;
 693         sd_journal *j = NULL;
 694         unsigned line = 0;
 695         bool need_seek = false;
 696         sd_id128_t previous_boot_id;
 697         bool previous_boot_id_valid = false;
 698         bool have_pager;
 699
 700         log_parse_environment();
 701         log_open();
 702
 703         r = parse_argv(argc, argv);
 704         if (r <= 0)
 705                 goto finish;
 706
 707         if (arg_action == ACTION_NEW_ID128) {
 708                 r = generate_new_id128();
 709                 goto finish;
 710         }
 711
 712         if (arg_action == ACTION_SETUP_KEYS) {
 713                 r = setup_keys();
 714                 goto finish;
 715         }
 716
 717         if (arg_directory)
 718                 r = sd_journal_open_directory(&j, arg_directory, 0);
 719         else
 720                 r = sd_journal_open(&j, arg_local ? SD_JOURNAL_LOCAL_ONLY : 0);
 721
 722         if (r < 0) {
 723                 log_error("Failed to open journal: %s", strerror(-r));
 724                 goto finish;
 725         }
 726
 727         if (arg_action == ACTION_VERIFY) {
 728                 r = verify(j);
 729                 goto finish;
 730         }
 731
 732         if (arg_action == ACTION_PRINT_HEADER) {
 733                 journal_print_header(j);
 734                 r = 0;
 735                 goto finish;
 736         }
 737
 738 #ifdef HAVE_ACL
 739         if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0)
 740                 log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");
 741 #endif
 742
 743         r = add_this_boot(j);
 744         if (r < 0)
 745                 goto finish;
 746
 747         r = add_matches(j, argv + optind);
 748         if (r < 0)
 749                 goto finish;
 750
 751         r = add_priorities(j);
 752         if (r < 0)
 753                 goto finish;
 754
 755         if (!arg_quiet) {
 756                 usec_t start, end;
 757                 char start_buf[FORMAT_TIMESTAMP_MAX], end_buf[FORMAT_TIMESTAMP_MAX];
 758
 759                 r = sd_journal_get_cutoff_realtime_usec(j, &start, &end);
 760                 if (r < 0) {
 761                         log_error("Failed to get cutoff: %s", strerror(-r));
 762                         goto finish;
 763                 }
 764
 765                 if (r > 0) {
 766                         if (arg_follow)
 767                                 printf("Logs begin at %s.\n", format_timestamp(start_buf, sizeof(start_buf), start));
 768                         else
 769                                 printf("Logs begin at %s, end at %s.\n",
 770                                        format_timestamp(start_buf, sizeof(start_buf), start),
 771                                        format_timestamp(end_buf, sizeof(end_buf), end));
 772                 }
 773         }
 774
 775         if (arg_lines >= 0) {
 776                 r = sd_journal_seek_tail(j);
 777                 if (r < 0) {
 778                         log_error("Failed to seek to tail: %s", strerror(-r));
 779                         goto finish;
 780                 }
 781
 782                 r = sd_journal_previous_skip(j, arg_lines);
 783         } else {
 784                 r = sd_journal_seek_head(j);
 785                 if (r < 0) {
 786                         log_error("Failed to seek to head: %s", strerror(-r));
 787                         goto finish;
 788                 }
 789
 790                 r = sd_journal_next(j);
 791         }
 792
 793         if (r < 0) {
 794                 log_error("Failed to iterate through journal: %s", strerror(-r));
 795                 goto finish;
 796         }
 797
 798         on_tty();
 799         have_pager = !arg_no_pager && !arg_follow && pager_open();
 800
 801         if (arg_output == OUTPUT_JSON) {
 802                 fputc('[', stdout);
 803                 fflush(stdout);
 804         }
 805
 806         for (;;) {
 807                 for (;;) {
 808                         sd_id128_t boot_id;
 809                         int flags =
 810                                 arg_show_all * OUTPUT_SHOW_ALL |
 811                                 have_pager * OUTPUT_FULL_WIDTH |
 812                                 on_tty() * OUTPUT_COLOR;
 813
 814                         if (need_seek) {
 815                                 r = sd_journal_next(j);
 816                                 if (r < 0) {
 817                                         log_error("Failed to iterate through journal: %s", strerror(-r));
 818                                         goto finish;
 819                                 }
 820                         }
 821
 822                         if (r == 0)
 823                                 break;
 824
 825                         r = sd_journal_get_monotonic_usec(j, NULL, &boot_id);
 826                         if (r >= 0) {
 827                                 if (previous_boot_id_valid &&
 828                                     !sd_id128_equal(boot_id, previous_boot_id))
 829                                         printf(ANSI_HIGHLIGHT_ON "----- Reboot -----" ANSI_HIGHLIGHT_OFF "\n");
 830
 831                                 previous_boot_id = boot_id;
 832                                 previous_boot_id_valid = true;
 833                         }
 834
 835                         line ++;
 836
 837                         r = output_journal(j, arg_output, line, 0, flags);
 838                         if (r < 0)
 839                                 goto finish;
 840
 841                         need_seek = true;
 842                 }
 843
 844                 if (!arg_follow)
 845                         break;
 846
 847                 r = sd_journal_wait(j, (uint64_t) -1);
 848                 if (r < 0) {
 849                         log_error("Couldn't wait for log event: %s", strerror(-r));
 850                         goto finish;
 851                 }
 852         }
 853
 854         if (arg_output == OUTPUT_JSON)
 855                 fputs("\n]\n", stdout);
 856
 857 finish:
 858         if (j)
 859                 sd_journal_close(j);
 860
 861         pager_close();
 862
 863         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 864 }