src/journal/journald-stream.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <stddef.h>
   4 #include <unistd.h>
   5
   6 #if HAVE_SELINUX
   7 #include <selinux/selinux.h>
   8 #endif
   9
  10 #include "sd-daemon.h"
  11 #include "sd-event.h"
  12
  13 #include "alloc-util.h"
  14 #include "dirent-util.h"
  15 #include "env-file.h"
  16 #include "escape.h"
  17 #include "fd-util.h"
  18 #include "fileio.h"
  19 #include "io-util.h"
  20 #include "journald-console.h"
  21 #include "journald-context.h"
  22 #include "journald-kmsg.h"
  23 #include "journald-server.h"
  24 #include "journald-stream.h"
  25 #include "journald-syslog.h"
  26 #include "journald-wall.h"
  27 #include "mkdir.h"
  28 #include "parse-util.h"
  29 #include "process-util.h"
  30 #include "selinux-util.h"
  31 #include "socket-util.h"
  32 #include "stdio-util.h"
  33 #include "string-util.h"
  34 #include "syslog-util.h"
  35 #include "tmpfile-util.h"
  36 #include "unit-name.h"
  37
  38 #define STDOUT_STREAMS_MAX 4096
  39
  40 typedef enum StdoutStreamState {
  41         STDOUT_STREAM_IDENTIFIER,
  42         STDOUT_STREAM_UNIT_ID,
  43         STDOUT_STREAM_PRIORITY,
  44         STDOUT_STREAM_LEVEL_PREFIX,
  45         STDOUT_STREAM_FORWARD_TO_SYSLOG,
  46         STDOUT_STREAM_FORWARD_TO_KMSG,
  47         STDOUT_STREAM_FORWARD_TO_CONSOLE,
  48         STDOUT_STREAM_RUNNING
  49 } StdoutStreamState;
  50
  51 /* The different types of log record terminators: a real \n was read, a NUL character was read, the maximum line length
  52  * was reached, or the end of the stream was reached */
  53
  54 typedef enum LineBreak {
  55         LINE_BREAK_NEWLINE,
  56         LINE_BREAK_NUL,
  57         LINE_BREAK_LINE_MAX,
  58         LINE_BREAK_EOF,
  59 } LineBreak;
  60
  61 struct StdoutStream {
  62         Server *server;
  63         StdoutStreamState state;
  64
  65         int fd;
  66
  67         struct ucred ucred;
  68         char *label;
  69         char *identifier;
  70         char *unit_id;
  71         int priority;
  72         bool level_prefix:1;
  73         bool forward_to_syslog:1;
  74         bool forward_to_kmsg:1;
  75         bool forward_to_console:1;
  76
  77         bool fdstore:1;
  78         bool in_notify_queue:1;
  79
  80         char *buffer;
  81         size_t length;
  82         size_t allocated;
  83
  84         sd_event_source *event_source;
  85
  86         char *state_file;
  87
  88         ClientContext *context;
  89
  90         LIST_FIELDS(StdoutStream, stdout_stream);
  91         LIST_FIELDS(StdoutStream, stdout_stream_notify_queue);
  92
  93         char id_field[STRLEN("_STREAM_ID=") + SD_ID128_STRING_MAX];
  94 };
  95
  96 void stdout_stream_free(StdoutStream *s) {
  97         if (!s)
  98                 return;
  99
 100         if (s->server) {
 101
 102                 if (s->context)
 103                         client_context_release(s->server, s->context);
 104
 105                 assert(s->server->n_stdout_streams > 0);
 106                 s->server->n_stdout_streams--;
 107                 LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
 108
 109                 if (s->in_notify_queue)
 110                         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 111         }
 112
 113         if (s->event_source) {
 114                 sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
 115                 s->event_source = sd_event_source_unref(s->event_source);
 116         }
 117
 118         safe_close(s->fd);
 119         free(s->label);
 120         free(s->identifier);
 121         free(s->unit_id);
 122         free(s->state_file);
 123         free(s->buffer);
 124
 125         free(s);
 126 }
 127
 128 DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
 129
 130 void stdout_stream_destroy(StdoutStream *s) {
 131         if (!s)
 132                 return;
 133
 134         if (s->state_file)
 135                 (void) unlink(s->state_file);
 136
 137         stdout_stream_free(s);
 138 }
 139
 140 static int stdout_stream_save(StdoutStream *s) {
 141         _cleanup_free_ char *temp_path = NULL;
 142         _cleanup_fclose_ FILE *f = NULL;
 143         int r;
 144
 145         assert(s);
 146
 147         if (s->state != STDOUT_STREAM_RUNNING)
 148                 return 0;
 149
 150         if (!s->state_file) {
 151                 struct stat st;
 152
 153                 r = fstat(s->fd, &st);
 154                 if (r < 0)
 155                         return log_warning_errno(errno, "Failed to stat connected stream: %m");
 156
 157                 /* We use device and inode numbers as identifier for the stream */
 158                 if (asprintf(&s->state_file, "/run/systemd/journal/streams/%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
 159                         return log_oom();
 160         }
 161
 162         mkdir_p("/run/systemd/journal/streams", 0755);
 163
 164         r = fopen_temporary(s->state_file, &f, &temp_path);
 165         if (r < 0)
 166                 goto fail;
 167
 168         fprintf(f,
 169                 "# This is private data. Do not parse\n"
 170                 "PRIORITY=%i\n"
 171                 "LEVEL_PREFIX=%i\n"
 172                 "FORWARD_TO_SYSLOG=%i\n"
 173                 "FORWARD_TO_KMSG=%i\n"
 174                 "FORWARD_TO_CONSOLE=%i\n"
 175                 "STREAM_ID=%s\n",
 176                 s->priority,
 177                 s->level_prefix,
 178                 s->forward_to_syslog,
 179                 s->forward_to_kmsg,
 180                 s->forward_to_console,
 181                 s->id_field + STRLEN("_STREAM_ID="));
 182
 183         if (!isempty(s->identifier)) {
 184                 _cleanup_free_ char *escaped;
 185
 186                 escaped = cescape(s->identifier);
 187                 if (!escaped) {
 188                         r = -ENOMEM;
 189                         goto fail;
 190                 }
 191
 192                 fprintf(f, "IDENTIFIER=%s\n", escaped);
 193         }
 194
 195         if (!isempty(s->unit_id)) {
 196                 _cleanup_free_ char *escaped;
 197
 198                 escaped = cescape(s->unit_id);
 199                 if (!escaped) {
 200                         r = -ENOMEM;
 201                         goto fail;
 202                 }
 203
 204                 fprintf(f, "UNIT=%s\n", escaped);
 205         }
 206
 207         r = fflush_and_check(f);
 208         if (r < 0)
 209                 goto fail;
 210
 211         if (rename(temp_path, s->state_file) < 0) {
 212                 r = -errno;
 213                 goto fail;
 214         }
 215
 216         if (!s->fdstore && !s->in_notify_queue) {
 217                 LIST_PREPEND(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 218                 s->in_notify_queue = true;
 219
 220                 if (s->server->notify_event_source) {
 221                         r = sd_event_source_set_enabled(s->server->notify_event_source, SD_EVENT_ON);
 222                         if (r < 0)
 223                                 log_warning_errno(r, "Failed to enable notify event source: %m");
 224                 }
 225         }
 226
 227         return 0;
 228
 229 fail:
 230         (void) unlink(s->state_file);
 231
 232         if (temp_path)
 233                 (void) unlink(temp_path);
 234
 235         return log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
 236 }
 237
 238 static int stdout_stream_log(StdoutStream *s, const char *p, LineBreak line_break) {
 239         struct iovec *iovec;
 240         int priority;
 241         char syslog_priority[] = "PRIORITY=\0";
 242         char syslog_facility[STRLEN("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int) + 1];
 243         _cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
 244         size_t n = 0, m;
 245         int r;
 246
 247         assert(s);
 248         assert(p);
 249
 250         if (s->context)
 251                 (void) client_context_maybe_refresh(s->server, s->context, NULL, NULL, 0, NULL, USEC_INFINITY);
 252         else if (pid_is_valid(s->ucred.pid)) {
 253                 r = client_context_acquire(s->server, s->ucred.pid, &s->ucred, s->label, strlen_ptr(s->label), s->unit_id, &s->context);
 254                 if (r < 0)
 255                         log_warning_errno(r, "Failed to acquire client context, ignoring: %m");
 256         }
 257
 258         priority = s->priority;
 259
 260         if (s->level_prefix)
 261                 syslog_parse_priority(&p, &priority, false);
 262
 263         if (!client_context_test_priority(s->context, priority))
 264                 return 0;
 265
 266         if (isempty(p))
 267                 return 0;
 268
 269         if (s->forward_to_syslog || s->server->forward_to_syslog)
 270                 server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
 271
 272         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
 273                 server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
 274
 275         if (s->forward_to_console || s->server->forward_to_console)
 276                 server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
 277
 278         if (s->server->forward_to_wall)
 279                 server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
 280
 281         m = N_IOVEC_META_FIELDS + 7 + client_context_extra_fields_n_iovec(s->context);
 282         iovec = newa(struct iovec, m);
 283
 284         iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=stdout");
 285         iovec[n++] = IOVEC_MAKE_STRING(s->id_field);
 286
 287         syslog_priority[STRLEN("PRIORITY=")] = '0' + LOG_PRI(priority);
 288         iovec[n++] = IOVEC_MAKE_STRING(syslog_priority);
 289
 290         if (priority & LOG_FACMASK) {
 291                 xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
 292                 iovec[n++] = IOVEC_MAKE_STRING(syslog_facility);
 293         }
 294
 295         if (s->identifier) {
 296                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
 297                 if (syslog_identifier)
 298                         iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier);
 299         }
 300
 301         if (line_break != LINE_BREAK_NEWLINE) {
 302                 const char *c;
 303
 304                 /* If this log message was generated due to an uncommon line break then mention this in the log
 305                  * entry */
 306
 307                 c =     line_break == LINE_BREAK_NUL ?      "_LINE_BREAK=nul" :
 308                         line_break == LINE_BREAK_LINE_MAX ? "_LINE_BREAK=line-max" :
 309                                                             "_LINE_BREAK=eof";
 310                 iovec[n++] = IOVEC_MAKE_STRING(c);
 311         }
 312
 313         message = strappend("MESSAGE=", p);
 314         if (message)
 315                 iovec[n++] = IOVEC_MAKE_STRING(message);
 316
 317         server_dispatch_message(s->server, iovec, n, m, s->context, NULL, priority, 0);
 318         return 0;
 319 }
 320
 321 static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
 322         int r;
 323         char *orig;
 324
 325         assert(s);
 326         assert(p);
 327
 328         orig = p;
 329         p = strstrip(p);
 330
 331         /* line breaks by NUL, line max length or EOF are not permissible during the negotiation part of the protocol */
 332         if (line_break != LINE_BREAK_NEWLINE && s->state != STDOUT_STREAM_RUNNING) {
 333                 log_warning("Control protocol line not properly terminated.");
 334                 return -EINVAL;
 335         }
 336
 337         switch (s->state) {
 338
 339         case STDOUT_STREAM_IDENTIFIER:
 340                 if (!isempty(p)) {
 341                         s->identifier = strdup(p);
 342                         if (!s->identifier)
 343                                 return log_oom();
 344                 }
 345
 346                 s->state = STDOUT_STREAM_UNIT_ID;
 347                 return 0;
 348
 349         case STDOUT_STREAM_UNIT_ID:
 350                 if (s->ucred.uid == 0 &&
 351                     unit_name_is_valid(p, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
 352
 353                         s->unit_id = strdup(p);
 354                         if (!s->unit_id)
 355                                 return log_oom();
 356                 }
 357
 358                 s->state = STDOUT_STREAM_PRIORITY;
 359                 return 0;
 360
 361         case STDOUT_STREAM_PRIORITY:
 362                 r = safe_atoi(p, &s->priority);
 363                 if (r < 0 || s->priority < 0 || s->priority > 999) {
 364                         log_warning("Failed to parse log priority line.");
 365                         return -EINVAL;
 366                 }
 367
 368                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
 369                 return 0;
 370
 371         case STDOUT_STREAM_LEVEL_PREFIX:
 372                 r = parse_boolean(p);
 373                 if (r < 0) {
 374                         log_warning("Failed to parse level prefix line.");
 375                         return -EINVAL;
 376                 }
 377
 378                 s->level_prefix = r;
 379                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
 380                 return 0;
 381
 382         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
 383                 r = parse_boolean(p);
 384                 if (r < 0) {
 385                         log_warning("Failed to parse forward to syslog line.");
 386                         return -EINVAL;
 387                 }
 388
 389                 s->forward_to_syslog = r;
 390                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
 391                 return 0;
 392
 393         case STDOUT_STREAM_FORWARD_TO_KMSG:
 394                 r = parse_boolean(p);
 395                 if (r < 0) {
 396                         log_warning("Failed to parse copy to kmsg line.");
 397                         return -EINVAL;
 398                 }
 399
 400                 s->forward_to_kmsg = r;
 401                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
 402                 return 0;
 403
 404         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
 405                 r = parse_boolean(p);
 406                 if (r < 0) {
 407                         log_warning("Failed to parse copy to console line.");
 408                         return -EINVAL;
 409                 }
 410
 411                 s->forward_to_console = r;
 412                 s->state = STDOUT_STREAM_RUNNING;
 413
 414                 /* Try to save the stream, so that journald can be restarted and we can recover */
 415                 (void) stdout_stream_save(s);
 416                 return 0;
 417
 418         case STDOUT_STREAM_RUNNING:
 419                 return stdout_stream_log(s, orig, line_break);
 420         }
 421
 422         assert_not_reached("Unknown stream state");
 423 }
 424
 425 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 426         char *p;
 427         size_t remaining;
 428         int r;
 429
 430         assert(s);
 431
 432         p = s->buffer;
 433         remaining = s->length;
 434
 435         /* XXX: This function does nothing if (s->length == 0) */
 436
 437         for (;;) {
 438                 LineBreak line_break;
 439                 size_t skip;
 440                 char *end1, *end2;
 441
 442                 end1 = memchr(p, '\n', remaining);
 443                 end2 = memchr(p, 0, end1 ? (size_t) (end1 - p) : remaining);
 444
 445                 if (end2) {
 446                         /* We found a NUL terminator */
 447                         skip = end2 - p + 1;
 448                         line_break = LINE_BREAK_NUL;
 449                 } else if (end1) {
 450                         /* We found a \n terminator */
 451                         *end1 = 0;
 452                         skip = end1 - p + 1;
 453                         line_break = LINE_BREAK_NEWLINE;
 454                 } else if (remaining >= s->server->line_max) {
 455                         /* Force a line break after the maximum line length */
 456                         *(p + s->server->line_max) = 0;
 457                         skip = remaining;
 458                         line_break = LINE_BREAK_LINE_MAX;
 459                 } else
 460                         break;
 461
 462                 r = stdout_stream_line(s, p, line_break);
 463                 if (r < 0)
 464                         return r;
 465
 466                 remaining -= skip;
 467                 p += skip;
 468         }
 469
 470         if (force_flush && remaining > 0) {
 471                 p[remaining] = 0;
 472                 r = stdout_stream_line(s, p, LINE_BREAK_EOF);
 473                 if (r < 0)
 474                         return r;
 475
 476                 p += remaining;
 477                 remaining = 0;
 478         }
 479
 480         if (p > s->buffer) {
 481                 memmove(s->buffer, p, remaining);
 482                 s->length = remaining;
 483         }
 484
 485         return 0;
 486 }
 487
 488 static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 489         StdoutStream *s = userdata;
 490         size_t limit;
 491         ssize_t l;
 492         int r;
 493
 494         assert(s);
 495
 496         if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
 497                 log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
 498                 goto terminate;
 499         }
 500
 501         /* If the buffer is full already (discounting the extra NUL we need), add room for another 1K */
 502         if (s->length + 1 >= s->allocated) {
 503                 if (!GREEDY_REALLOC(s->buffer, s->allocated, s->length + 1 + 1024)) {
 504                         log_oom();
 505                         goto terminate;
 506                 }
 507         }
 508
 509         /* Try to make use of the allocated buffer in full, but never read more than the configured line size. Also,
 510          * always leave room for a terminating NUL we might need to add. */
 511         limit = MIN(s->allocated - 1, s->server->line_max);
 512
 513         l = read(s->fd, s->buffer + s->length, limit - s->length);
 514         if (l < 0) {
 515                 if (errno == EAGAIN)
 516                         return 0;
 517
 518                 log_warning_errno(errno, "Failed to read from stream: %m");
 519                 goto terminate;
 520         }
 521
 522         if (l == 0) {
 523                 stdout_stream_scan(s, true);
 524                 goto terminate;
 525         }
 526
 527         s->length += l;
 528         r = stdout_stream_scan(s, false);
 529         if (r < 0)
 530                 goto terminate;
 531
 532         return 1;
 533
 534 terminate:
 535         stdout_stream_destroy(s);
 536         return 0;
 537 }
 538
 539 int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
 540         _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
 541         sd_id128_t id;
 542         int r;
 543
 544         assert(s);
 545         assert(fd >= 0);
 546
 547         r = sd_id128_randomize(&id);
 548         if (r < 0)
 549                 return log_error_errno(r, "Failed to generate stream ID: %m");
 550
 551         stream = new0(StdoutStream, 1);
 552         if (!stream)
 553                 return log_oom();
 554
 555         stream->fd = -1;
 556         stream->priority = LOG_INFO;
 557
 558         xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
 559
 560         r = getpeercred(fd, &stream->ucred);
 561         if (r < 0)
 562                 return log_error_errno(r, "Failed to determine peer credentials: %m");
 563
 564         if (mac_selinux_use()) {
 565                 r = getpeersec(fd, &stream->label);
 566                 if (r < 0 && r != -EOPNOTSUPP)
 567                         (void) log_warning_errno(r, "Failed to determine peer security context: %m");
 568         }
 569
 570         (void) shutdown(fd, SHUT_WR);
 571
 572         r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
 573         if (r < 0)
 574                 return log_error_errno(r, "Failed to add stream to event loop: %m");
 575
 576         r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
 577         if (r < 0)
 578                 return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
 579
 580         stream->fd = fd;
 581
 582         stream->server = s;
 583         LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
 584         s->n_stdout_streams++;
 585
 586         if (ret)
 587                 *ret = stream;
 588
 589         stream = NULL;
 590
 591         return 0;
 592 }
 593
 594 static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
 595         _cleanup_close_ int fd = -1;
 596         Server *s = userdata;
 597         int r;
 598
 599         assert(s);
 600
 601         if (revents != EPOLLIN)
 602                 return log_error_errno(SYNTHETIC_ERRNO(EIO),
 603                                        "Got invalid event from epoll for stdout server fd: %" PRIx32,
 604                                        revents);
 605
 606         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
 607         if (fd < 0) {
 608                 if (errno == EAGAIN)
 609                         return 0;
 610
 611                 return log_error_errno(errno, "Failed to accept stdout connection: %m");
 612         }
 613
 614         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 615                 struct ucred u;
 616
 617                 r = getpeercred(fd, &u);
 618
 619                 /* By closing fd here we make sure that the client won't wait too long for journald to
 620                  * gather all the data it adds to the error message to find out that the connection has
 621                  * just been refused.
 622                  */
 623                 fd = safe_close(fd);
 624
 625                 server_driver_message(s, r < 0 ? 0 : u.pid, NULL, LOG_MESSAGE("Too many stdout streams, refusing connection."), NULL);
 626                 return 0;
 627         }
 628
 629         r = stdout_stream_install(s, fd, NULL);
 630         if (r < 0)
 631                 return r;
 632
 633         fd = -1;
 634         return 0;
 635 }
 636
 637 static int stdout_stream_load(StdoutStream *stream, const char *fname) {
 638         _cleanup_free_ char
 639                 *priority = NULL,
 640                 *level_prefix = NULL,
 641                 *forward_to_syslog = NULL,
 642                 *forward_to_kmsg = NULL,
 643                 *forward_to_console = NULL,
 644                 *stream_id = NULL;
 645         int r;
 646
 647         assert(stream);
 648         assert(fname);
 649
 650         if (!stream->state_file) {
 651                 stream->state_file = strappend("/run/systemd/journal/streams/", fname);
 652                 if (!stream->state_file)
 653                         return log_oom();
 654         }
 655
 656         r = parse_env_file(NULL, stream->state_file,
 657                            "PRIORITY", &priority,
 658                            "LEVEL_PREFIX", &level_prefix,
 659                            "FORWARD_TO_SYSLOG", &forward_to_syslog,
 660                            "FORWARD_TO_KMSG", &forward_to_kmsg,
 661                            "FORWARD_TO_CONSOLE", &forward_to_console,
 662                            "IDENTIFIER", &stream->identifier,
 663                            "UNIT", &stream->unit_id,
 664                            "STREAM_ID", &stream_id);
 665         if (r < 0)
 666                 return log_error_errno(r, "Failed to read: %s", stream->state_file);
 667
 668         if (priority) {
 669                 int p;
 670
 671                 p = log_level_from_string(priority);
 672                 if (p >= 0)
 673                         stream->priority = p;
 674         }
 675
 676         if (level_prefix) {
 677                 r = parse_boolean(level_prefix);
 678                 if (r >= 0)
 679                         stream->level_prefix = r;
 680         }
 681
 682         if (forward_to_syslog) {
 683                 r = parse_boolean(forward_to_syslog);
 684                 if (r >= 0)
 685                         stream->forward_to_syslog = r;
 686         }
 687
 688         if (forward_to_kmsg) {
 689                 r = parse_boolean(forward_to_kmsg);
 690                 if (r >= 0)
 691                         stream->forward_to_kmsg = r;
 692         }
 693
 694         if (forward_to_console) {
 695                 r = parse_boolean(forward_to_console);
 696                 if (r >= 0)
 697                         stream->forward_to_console = r;
 698         }
 699
 700         if (stream_id) {
 701                 sd_id128_t id;
 702
 703                 r = sd_id128_from_string(stream_id, &id);
 704                 if (r >= 0)
 705                         xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
 706         }
 707
 708         return 0;
 709 }
 710
 711 static int stdout_stream_restore(Server *s, const char *fname, int fd) {
 712         StdoutStream *stream;
 713         int r;
 714
 715         assert(s);
 716         assert(fname);
 717         assert(fd >= 0);
 718
 719         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 720                 log_warning("Too many stdout streams, refusing restoring of stream.");
 721                 return -ENOBUFS;
 722         }
 723
 724         r = stdout_stream_install(s, fd, &stream);
 725         if (r < 0)
 726                 return r;
 727
 728         stream->state = STDOUT_STREAM_RUNNING;
 729         stream->fdstore = true;
 730
 731         /* Ignore all parsing errors */
 732         (void) stdout_stream_load(stream, fname);
 733
 734         return 0;
 735 }
 736
 737 int server_restore_streams(Server *s, FDSet *fds) {
 738         _cleanup_closedir_ DIR *d = NULL;
 739         struct dirent *de;
 740         int r;
 741
 742         d = opendir("/run/systemd/journal/streams");
 743         if (!d) {
 744                 if (errno == ENOENT)
 745                         return 0;
 746
 747                 return log_warning_errno(errno, "Failed to enumerate /run/systemd/journal/streams: %m");
 748         }
 749
 750         FOREACH_DIRENT(de, d, goto fail) {
 751                 unsigned long st_dev, st_ino;
 752                 bool found = false;
 753                 Iterator i;
 754                 int fd;
 755
 756                 if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
 757                         continue;
 758
 759                 FDSET_FOREACH(fd, fds, i) {
 760                         struct stat st;
 761
 762                         if (fstat(fd, &st) < 0)
 763                                 return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
 764
 765                         if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
 766                                 found = true;
 767                                 break;
 768                         }
 769                 }
 770
 771                 if (!found) {
 772                         /* No file descriptor? Then let's delete the state file */
 773                         log_debug("Cannot restore stream file %s", de->d_name);
 774                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 775                                 log_warning_errno(errno, "Failed to remove /run/systemd/journal/streams/%s: %m",
 776                                                   de->d_name);
 777                         continue;
 778                 }
 779
 780                 fdset_remove(fds, fd);
 781
 782                 r = stdout_stream_restore(s, de->d_name, fd);
 783                 if (r < 0)
 784                         safe_close(fd);
 785         }
 786
 787         return 0;
 788
 789 fail:
 790         return log_error_errno(errno, "Failed to read streams directory: %m");
 791 }
 792
 793 int server_open_stdout_socket(Server *s) {
 794         static const union sockaddr_union sa = {
 795                 .un.sun_family = AF_UNIX,
 796                 .un.sun_path = "/run/systemd/journal/stdout",
 797         };
 798         int r;
 799
 800         assert(s);
 801
 802         if (s->stdout_fd < 0) {
 803                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 804                 if (s->stdout_fd < 0)
 805                         return log_error_errno(errno, "socket() failed: %m");
 806
 807                 (void) sockaddr_un_unlink(&sa.un);
 808
 809                 r = bind(s->stdout_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
 810                 if (r < 0)
 811                         return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
 812
 813                 (void) chmod(sa.un.sun_path, 0666);
 814
 815                 if (listen(s->stdout_fd, SOMAXCONN) < 0)
 816                         return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
 817         } else
 818                 (void) fd_nonblock(s->stdout_fd, true);
 819
 820         r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
 821         if (r < 0)
 822                 return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
 823
 824         r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
 825         if (r < 0)
 826                 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
 827
 828         return 0;
 829 }
 830
 831 void stdout_stream_send_notify(StdoutStream *s) {
 832         struct iovec iovec = {
 833                 .iov_base = (char*) "FDSTORE=1",
 834                 .iov_len = STRLEN("FDSTORE=1"),
 835         };
 836         struct msghdr msghdr = {
 837                 .msg_iov = &iovec,
 838                 .msg_iovlen = 1,
 839         };
 840         struct cmsghdr *cmsg;
 841         ssize_t l;
 842
 843         assert(s);
 844         assert(!s->fdstore);
 845         assert(s->in_notify_queue);
 846         assert(s->server);
 847         assert(s->server->notify_fd >= 0);
 848
 849         /* Store the connection fd in PID 1, so that we get it passed
 850          * in again on next start */
 851
 852         msghdr.msg_controllen = CMSG_SPACE(sizeof(int));
 853         msghdr.msg_control = alloca0(msghdr.msg_controllen);
 854
 855         cmsg = CMSG_FIRSTHDR(&msghdr);
 856         cmsg->cmsg_level = SOL_SOCKET;
 857         cmsg->cmsg_type = SCM_RIGHTS;
 858         cmsg->cmsg_len = CMSG_LEN(sizeof(int));
 859
 860         memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int));
 861
 862         l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL);
 863         if (l < 0) {
 864                 if (errno == EAGAIN)
 865                         return;
 866
 867                 log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m");
 868         } else {
 869                 log_debug("Successfully sent stream file descriptor to service manager.");
 870                 s->fdstore = 1;
 871         }
 872
 873         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 874         s->in_notify_queue = false;
 875
 876 }