src/logs-show.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2012 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <time.h>
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <sys/poll.h>
  26 #include <string.h>
  27
  28 #include "logs-show.h"
  29 #include "log.h"
  30 #include "util.h"
  31
  32 #define PRINT_THRESHOLD 128
  33
  34 static bool contains_unprintable(const void *p, size_t l) {
  35         const char *j;
  36
  37         for (j = p; j < (const char *) p + l; j++)
  38                 if (*j < ' ' || *j >= 127)
  39                         return true;
  40
  41         return false;
  42 }
  43
  44 static int parse_field(const void *data, size_t length, const char *field, char **target, size_t *target_size) {
  45         size_t fl, nl;
  46         void *buf;
  47
  48         assert(data);
  49         assert(field);
  50         assert(target);
  51         assert(target_size);
  52
  53         fl = strlen(field);
  54         if (length < fl)
  55                 return 0;
  56
  57         if (memcmp(data, field, fl))
  58                 return 0;
  59
  60         nl = length - fl;
  61         buf = malloc(nl+1);
  62         memcpy(buf, (const char*) data + fl, nl);
  63         ((char*)buf)[nl] = 0;
  64         if (!buf) {
  65                 log_error("Out of memory");
  66                 return -ENOMEM;
  67         }
  68
  69         free(*target);
  70         *target = buf;
  71         *target_size = nl;
  72
  73         return 1;
  74 }
  75
  76 static bool shall_print(bool show_all, char *p, size_t l) {
  77         if (show_all)
  78                 return true;
  79
  80         if (l > PRINT_THRESHOLD)
  81                 return false;
  82
  83         if (contains_unprintable(p, l))
  84                 return false;
  85
  86         return true;
  87 }
  88
  89 static int output_short(sd_journal *j, unsigned line, unsigned n_columns, bool show_all, bool monotonic_mode) {
  90         int r;
  91         const void *data;
  92         size_t length;
  93         size_t n = 0;
  94         char *hostname = NULL, *identifier = NULL, *comm = NULL, *pid = NULL, *fake_pid = NULL, *message = NULL, *realtime = NULL, *monotonic = NULL;
  95         size_t hostname_len = 0, identifier_len = 0, comm_len = 0, pid_len = 0, fake_pid_len = 0, message_len = 0, realtime_len = 0, monotonic_len = 0;
  96
  97         assert(j);
  98
  99         SD_JOURNAL_FOREACH_DATA(j, data, length) {
 100
 101                 r = parse_field(data, length, "_HOSTNAME=", &hostname, &hostname_len);
 102                 if (r < 0)
 103                         goto finish;
 104                 else if (r > 0)
 105                         continue;
 106
 107                 r = parse_field(data, length, "SYSLOG_IDENTIFIER=", &identifier, &identifier_len);
 108                 if (r < 0)
 109                         goto finish;
 110                 else if (r > 0)
 111                         continue;
 112
 113                 r = parse_field(data, length, "_COMM=", &comm, &comm_len);
 114                 if (r < 0)
 115                         goto finish;
 116                 else if (r > 0)
 117                         continue;
 118
 119                 r = parse_field(data, length, "_PID=", &pid, &pid_len);
 120                 if (r < 0)
 121                         goto finish;
 122                 else if (r > 0)
 123                         continue;
 124
 125                 r = parse_field(data, length, "SYSLOG_PID=", &fake_pid, &fake_pid_len);
 126                 if (r < 0)
 127                         goto finish;
 128                 else if (r > 0)
 129                         continue;
 130
 131                 r = parse_field(data, length, "_SOURCE_REALTIME_TIMESTAMP=", &realtime, &realtime_len);
 132                 if (r < 0)
 133                         goto finish;
 134                 else if (r > 0)
 135                         continue;
 136
 137                 r = parse_field(data, length, "_SOURCE_MONOTONIC_TIMESTAMP=", &monotonic, &monotonic_len);
 138                 if (r < 0)
 139                         goto finish;
 140                 else if (r > 0)
 141                         continue;
 142
 143                 r = parse_field(data, length, "MESSAGE=", &message, &message_len);
 144                 if (r < 0)
 145                         goto finish;
 146         }
 147
 148         if (!message) {
 149                 r = 0;
 150                 goto finish;
 151         }
 152
 153         if (monotonic_mode) {
 154                 uint64_t t;
 155                 sd_id128_t boot_id;
 156
 157                 r = -ENOENT;
 158
 159                 if (monotonic)
 160                         r = safe_atou64(monotonic, &t);
 161
 162                 if (r < 0)
 163                         r = sd_journal_get_monotonic_usec(j, &t, &boot_id);
 164
 165                 if (r < 0) {
 166                         log_error("Failed to get monotonic: %s", strerror(-r));
 167                         goto finish;
 168                 }
 169
 170                 printf("[%5llu.%06llu]",
 171                        (unsigned long long) (t / USEC_PER_SEC),
 172                        (unsigned long long) (t % USEC_PER_SEC));
 173
 174                 n += 1 + 5 + 1 + 6 + 1;
 175
 176         } else {
 177                 char buf[64];
 178                 uint64_t x;
 179                 time_t t;
 180                 struct tm tm;
 181
 182                 r = -ENOENT;
 183
 184                 if (realtime)
 185                         r = safe_atou64(realtime, &x);
 186
 187                 if (r < 0)
 188                         r = sd_journal_get_realtime_usec(j, &x);
 189
 190                 if (r < 0) {
 191                         log_error("Failed to get realtime: %s", strerror(-r));
 192                         goto finish;
 193                 }
 194
 195                 t = (time_t) (x / USEC_PER_SEC);
 196                 if (strftime(buf, sizeof(buf), "%b %d %H:%M:%S", localtime_r(&t, &tm)) <= 0) {
 197                         log_error("Failed to format time.");
 198                         goto finish;
 199                 }
 200
 201                 fputs(buf, stdout);
 202                 n += strlen(buf);
 203         }
 204
 205         if (hostname && shall_print(show_all, hostname, hostname_len)) {
 206                 printf(" %.*s", (int) hostname_len, hostname);
 207                 n += hostname_len + 1;
 208         }
 209
 210         if (identifier && shall_print(show_all, identifier, identifier_len)) {
 211                 printf(" %.*s", (int) identifier_len, identifier);
 212                 n += identifier_len + 1;
 213         } else if (comm && shall_print(show_all, comm, comm_len)) {
 214                 printf(" %.*s", (int) comm_len, comm);
 215                 n += comm_len + 1;
 216         }
 217
 218         if (pid && shall_print(show_all, pid, pid_len)) {
 219                 printf("[%.*s]", (int) pid_len, pid);
 220                 n += pid_len + 2;
 221         } else if (fake_pid && shall_print(show_all, fake_pid, fake_pid_len)) {
 222                 printf("[%.*s]", (int) fake_pid_len, fake_pid);
 223                 n += fake_pid_len + 2;
 224         }
 225
 226         if (show_all)
 227                 printf(": %.*s\n", (int) message_len, message);
 228         else if (contains_unprintable(message, message_len)) {
 229                 char bytes[FORMAT_BYTES_MAX];
 230                 printf(": [%s blob data]\n", format_bytes(bytes, sizeof(bytes), message_len));
 231         } else if (message_len + n < n_columns)
 232                 printf(": %.*s\n", (int) message_len, message);
 233         else if (n < n_columns) {
 234                 char *e;
 235
 236                 e = ellipsize_mem(message, message_len, n_columns - n - 2, 90);
 237
 238                 if (!e)
 239                         printf(": %.*s\n", (int) message_len, message);
 240                 else
 241                         printf(": %s\n", e);
 242
 243                 free(e);
 244         } else
 245                 fputs("\n", stdout);
 246
 247         r = 0;
 248
 249 finish:
 250         free(hostname);
 251         free(identifier);
 252         free(comm);
 253         free(pid);
 254         free(fake_pid);
 255         free(message);
 256         free(monotonic);
 257         free(realtime);
 258
 259         return r;
 260 }
 261
 262 static int output_short_realtime(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
 263         return output_short(j, line, n_columns, show_all, false);
 264 }
 265
 266 static int output_short_monotonic(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
 267         return output_short(j, line, n_columns, show_all, true);
 268 }
 269
 270 static int output_verbose(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
 271         const void *data;
 272         size_t length;
 273         char *cursor;
 274         uint64_t realtime;
 275         char ts[FORMAT_TIMESTAMP_MAX];
 276         int r;
 277
 278         assert(j);
 279
 280         r = sd_journal_get_realtime_usec(j, &realtime);
 281         if (r < 0) {
 282                 log_error("Failed to get realtime timestamp: %s", strerror(-r));
 283                 return r;
 284         }
 285
 286         r = sd_journal_get_cursor(j, &cursor);
 287         if (r < 0) {
 288                 log_error("Failed to get cursor: %s", strerror(-r));
 289                 return r;
 290         }
 291
 292         printf("%s [%s]\n",
 293                format_timestamp(ts, sizeof(ts), realtime),
 294                cursor);
 295
 296         free(cursor);
 297
 298         SD_JOURNAL_FOREACH_DATA(j, data, length) {
 299                 if (!show_all && (length > PRINT_THRESHOLD ||
 300                                   contains_unprintable(data, length))) {
 301                         const char *c;
 302                         char bytes[FORMAT_BYTES_MAX];
 303
 304                         c = memchr(data, '=', length);
 305                         if (!c) {
 306                                 log_error("Invalid field.");
 307                                 return -EINVAL;
 308                         }
 309
 310                         printf("\t%.*s=[%s blob data]\n",
 311                                (int) (c - (const char*) data),
 312                                (const char*) data,
 313                                format_bytes(bytes, sizeof(bytes), length - (c - (const char *) data) - 1));
 314                 } else
 315                         printf("\t%.*s\n", (int) length, (const char*) data);
 316         }
 317
 318         return 0;
 319 }
 320
 321 static int output_export(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
 322         sd_id128_t boot_id;
 323         char sid[33];
 324         int r;
 325         usec_t realtime, monotonic;
 326         char *cursor;
 327         const void *data;
 328         size_t length;
 329
 330         assert(j);
 331
 332         r = sd_journal_get_realtime_usec(j, &realtime);
 333         if (r < 0) {
 334                 log_error("Failed to get realtime timestamp: %s", strerror(-r));
 335                 return r;
 336         }
 337
 338         r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
 339         if (r < 0) {
 340                 log_error("Failed to get monotonic timestamp: %s", strerror(-r));
 341                 return r;
 342         }
 343
 344         r = sd_journal_get_cursor(j, &cursor);
 345         if (r < 0) {
 346                 log_error("Failed to get cursor: %s", strerror(-r));
 347                 return r;
 348         }
 349
 350         printf("__CURSOR=%s\n"
 351                "__REALTIME=%llu\n"
 352                "__MONOTONIC=%llu\n"
 353                "__BOOT_ID=%s\n",
 354                cursor,
 355                (unsigned long long) realtime,
 356                (unsigned long long) monotonic,
 357                sd_id128_to_string(boot_id, sid));
 358
 359         free(cursor);
 360
 361         SD_JOURNAL_FOREACH_DATA(j, data, length) {
 362
 363                 if (contains_unprintable(data, length)) {
 364                         const char *c;
 365                         uint64_t le64;
 366
 367                         c = memchr(data, '=', length);
 368                         if (!c) {
 369                                 log_error("Invalid field.");
 370                                 return -EINVAL;
 371                         }
 372
 373                         fwrite(data, c - (const char*) data, 1, stdout);
 374                         fputc('\n', stdout);
 375                         le64 = htole64(length - (c - (const char*) data) - 1);
 376                         fwrite(&le64, sizeof(le64), 1, stdout);
 377                         fwrite(c + 1, length - (c - (const char*) data) - 1, 1, stdout);
 378                 } else
 379                         fwrite(data, length, 1, stdout);
 380
 381                 fputc('\n', stdout);
 382         }
 383
 384         fputc('\n', stdout);
 385
 386         return 0;
 387 }
 388
 389 static void json_escape(const char* p, size_t l) {
 390
 391         if (contains_unprintable(p, l)) {
 392                 bool not_first = false;
 393
 394                 fputs("[ ", stdout);
 395
 396                 while (l > 0) {
 397                         if (not_first)
 398                                 printf(", %u", (uint8_t) *p);
 399                         else {
 400                                 not_first = true;
 401                                 printf("%u", (uint8_t) *p);
 402                         }
 403
 404                         p++;
 405                         l--;
 406                 }
 407
 408                 fputs(" ]", stdout);
 409         } else {
 410                 fputc('\"', stdout);
 411
 412                 while (l > 0) {
 413                         if (*p == '"' || *p == '\\') {
 414                                 fputc('\\', stdout);
 415                                 fputc(*p, stdout);
 416                         } else
 417                                 fputc(*p, stdout);
 418
 419                         p++;
 420                         l--;
 421                 }
 422
 423                 fputc('\"', stdout);
 424         }
 425 }
 426
 427 static int output_json(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
 428         uint64_t realtime, monotonic;
 429         char *cursor;
 430         const void *data;
 431         size_t length;
 432         sd_id128_t boot_id;
 433         char sid[33];
 434         int r;
 435
 436         assert(j);
 437
 438         r = sd_journal_get_realtime_usec(j, &realtime);
 439         if (r < 0) {
 440                 log_error("Failed to get realtime timestamp: %s", strerror(-r));
 441                 return r;
 442         }
 443
 444         r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
 445         if (r < 0) {
 446                 log_error("Failed to get monotonic timestamp: %s", strerror(-r));
 447                 return r;
 448         }
 449
 450         r = sd_journal_get_cursor(j, &cursor);
 451         if (r < 0) {
 452                 log_error("Failed to get cursor: %s", strerror(-r));
 453                 return r;
 454         }
 455
 456         if (line == 1)
 457                 fputc('\n', stdout);
 458         else
 459                 fputs(",\n", stdout);
 460
 461         printf("{\n"
 462                "\t\"__CURSOR\" : \"%s\",\n"
 463                "\t\"__REALTIME\" : \"%llu\",\n"
 464                "\t\"__MONOTONIC\" : \"%llu\",\n"
 465                "\t\"__BOOT_ID\" : \"%s\"",
 466                cursor,
 467                (unsigned long long) realtime,
 468                (unsigned long long) monotonic,
 469                sd_id128_to_string(boot_id, sid));
 470
 471         free(cursor);
 472
 473         SD_JOURNAL_FOREACH_DATA(j, data, length) {
 474                 const char *c;
 475
 476                 c = memchr(data, '=', length);
 477                 if (!c) {
 478                         log_error("Invalid field.");
 479                         return -EINVAL;
 480                 }
 481
 482                 fputs(",\n\t", stdout);
 483                 json_escape(data, c - (const char*) data);
 484                 fputs(" : ", stdout);
 485                 json_escape(c + 1, length - (c - (const char*) data) - 1);
 486         }
 487
 488         fputs("\n}", stdout);
 489         fflush(stdout);
 490
 491         return 0;
 492 }
 493
 494 static int output_cat(sd_journal *j, unsigned line, unsigned n_columns, bool show_all) {
 495         const void *data;
 496         size_t l;
 497         int r;
 498
 499         assert(j);
 500
 501         r = sd_journal_get_data(j, "MESSAGE", &data, &l);
 502         if (r < 0) {
 503                 log_error("Failed to get data: %s", strerror(-r));
 504                 return r;
 505         }
 506
 507         assert(l >= 8);
 508
 509         fwrite((const char*) data + 8, 1, l - 8, stdout);
 510         putchar('\n');
 511
 512         return 0;
 513 }
 514
 515 static int (*output_funcs[_OUTPUT_MODE_MAX])(sd_journal*j, unsigned line, unsigned n_columns, bool show_all) = {
 516         [OUTPUT_SHORT] = output_short_realtime,
 517         [OUTPUT_SHORT_MONOTONIC] = output_short_monotonic,
 518         [OUTPUT_VERBOSE] = output_verbose,
 519         [OUTPUT_EXPORT] = output_export,
 520         [OUTPUT_JSON] = output_json,
 521         [OUTPUT_CAT] = output_cat
 522 };
 523
 524 int output_journal(sd_journal *j, OutputMode mode, unsigned line, unsigned n_columns, bool show_all) {
 525         assert(mode >= 0);
 526         assert(mode < _OUTPUT_MODE_MAX);
 527
 528         if (n_columns <= 0)
 529                 n_columns = columns();
 530
 531         return output_funcs[mode](j, line, n_columns, show_all);
 532 }
 533
 534 int show_journal_by_unit(
 535                 const char *unit,
 536                 OutputMode mode,
 537                 unsigned n_columns,
 538                 usec_t not_before,
 539                 unsigned how_many,
 540                 bool show_all,
 541                 bool follow) {
 542
 543         char *m = NULL;
 544         sd_journal *j;
 545         int r;
 546         int fd;
 547         unsigned line = 0;
 548         bool need_seek = false;
 549
 550         assert(mode >= 0);
 551         assert(mode < _OUTPUT_MODE_MAX);
 552         assert(unit);
 553
 554         if (!endswith(unit, ".service") &&
 555             !endswith(unit, ".socket") &&
 556             !endswith(unit, ".mount") &&
 557             !endswith(unit, ".swap"))
 558                 return 0;
 559
 560         if (how_many <= 0)
 561                 return 0;
 562
 563         if (asprintf(&m, "_SYSTEMD_UNIT=%s", unit) < 0) {
 564                 r = -ENOMEM;
 565                 goto finish;
 566         }
 567
 568         r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY|SD_JOURNAL_SYSTEM_ONLY);
 569         if (r < 0)
 570                 goto finish;
 571
 572         fd = sd_journal_get_fd(j);
 573         if (fd < 0)
 574                 goto finish;
 575
 576         r = sd_journal_add_match(j, m, strlen(m));
 577         if (r < 0)
 578                 goto finish;
 579
 580         r = sd_journal_seek_tail(j);
 581         if (r < 0)
 582                 goto finish;
 583
 584         r = sd_journal_previous_skip(j, how_many);
 585         if (r < 0)
 586                 goto finish;
 587
 588         if (mode == OUTPUT_JSON) {
 589                 fputc('[', stdout);
 590                 fflush(stdout);
 591         }
 592
 593         for (;;) {
 594                 for (;;) {
 595                         usec_t usec;
 596
 597                         if (need_seek) {
 598                                 r = sd_journal_next(j);
 599                                 if (r < 0)
 600                                         goto finish;
 601                         }
 602
 603                         if (r == 0)
 604                                 break;
 605
 606                         need_seek = true;
 607
 608                         if (not_before > 0) {
 609                                 r = sd_journal_get_monotonic_usec(j, &usec, NULL);
 610
 611                                 /* -ESTALE is returned if the
 612                                    timestamp is not from this boot */
 613                                 if (r == -ESTALE)
 614                                         continue;
 615                                 else if (r < 0)
 616                                         goto finish;
 617
 618                                 if (usec < not_before)
 619                                         continue;
 620                         }
 621
 622                         line ++;
 623
 624                         r = output_journal(j, mode, line, n_columns, show_all);
 625                         if (r < 0)
 626                                 goto finish;
 627                 }
 628
 629                 if (!follow)
 630                         break;
 631
 632                 r = fd_wait_for_event(fd, POLLIN, (usec_t) -1);
 633                 if (r < 0)
 634                         goto finish;
 635
 636                 r = sd_journal_process(j);
 637                 if (r < 0)
 638                         goto finish;
 639
 640         }
 641
 642         if (mode == OUTPUT_JSON)
 643                 fputs("\n]\n", stdout);
 644
 645 finish:
 646         if (m)
 647                 free(m);
 648
 649         if (j)
 650                 sd_journal_close(j);
 651
 652         return r;
 653 }
 654
 655 static const char *const output_mode_table[_OUTPUT_MODE_MAX] = {
 656         [OUTPUT_SHORT] = "short",
 657         [OUTPUT_SHORT_MONOTONIC] = "short-monotonic",
 658         [OUTPUT_VERBOSE] = "verbose",
 659         [OUTPUT_EXPORT] = "export",
 660         [OUTPUT_JSON] = "json",
 661         [OUTPUT_CAT] = "cat"
 662 };
 663
 664 DEFINE_STRING_TABLE_LOOKUP(output_mode, OutputMode);