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