src/journal/journald-stream.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #include <stddef.h>
   9 #include <unistd.h>
  10
  11 #if HAVE_SELINUX
  12 #include <selinux/selinux.h>
  13 #endif
  14
  15 #include "sd-daemon.h"
  16 #include "sd-event.h"
  17
  18 #include "alloc-util.h"
  19 #include "dirent-util.h"
  20 #include "escape.h"
  21 #include "fd-util.h"
  22 #include "fileio.h"
  23 #include "io-util.h"
  24 #include "journald-console.h"
  25 #include "journald-context.h"
  26 #include "journald-kmsg.h"
  27 #include "journald-server.h"
  28 #include "journald-stream.h"
  29 #include "journald-syslog.h"
  30 #include "journald-wall.h"
  31 #include "mkdir.h"
  32 #include "parse-util.h"
  33 #include "process-util.h"
  34 #include "selinux-util.h"
  35 #include "socket-util.h"
  36 #include "stdio-util.h"
  37 #include "string-util.h"
  38 #include "syslog-util.h"
  39 #include "unit-name.h"
  40
  41 #define STDOUT_STREAMS_MAX 4096
  42
  43 typedef enum StdoutStreamState {
  44         STDOUT_STREAM_IDENTIFIER,
  45         STDOUT_STREAM_UNIT_ID,
  46         STDOUT_STREAM_PRIORITY,
  47         STDOUT_STREAM_LEVEL_PREFIX,
  48         STDOUT_STREAM_FORWARD_TO_SYSLOG,
  49         STDOUT_STREAM_FORWARD_TO_KMSG,
  50         STDOUT_STREAM_FORWARD_TO_CONSOLE,
  51         STDOUT_STREAM_RUNNING
  52 } StdoutStreamState;
  53
  54 /* The different types of log record terminators: a real \n was read, a NUL character was read, the maximum line length
  55  * was reached, or the end of the stream was reached */
  56
  57 typedef enum LineBreak {
  58         LINE_BREAK_NEWLINE,
  59         LINE_BREAK_NUL,
  60         LINE_BREAK_LINE_MAX,
  61         LINE_BREAK_EOF,
  62 } LineBreak;
  63
  64 struct StdoutStream {
  65         Server *server;
  66         StdoutStreamState state;
  67
  68         int fd;
  69
  70         struct ucred ucred;
  71         char *label;
  72         char *identifier;
  73         char *unit_id;
  74         int priority;
  75         bool level_prefix:1;
  76         bool forward_to_syslog:1;
  77         bool forward_to_kmsg:1;
  78         bool forward_to_console:1;
  79
  80         bool fdstore:1;
  81         bool in_notify_queue:1;
  82
  83         char *buffer;
  84         size_t length;
  85         size_t allocated;
  86
  87         sd_event_source *event_source;
  88
  89         char *state_file;
  90
  91         ClientContext *context;
  92
  93         LIST_FIELDS(StdoutStream, stdout_stream);
  94         LIST_FIELDS(StdoutStream, stdout_stream_notify_queue);
  95
  96         char id_field[STRLEN("_STREAM_ID=") + SD_ID128_STRING_MAX];
  97 };
  98
  99 void stdout_stream_free(StdoutStream *s) {
 100         if (!s)
 101                 return;
 102
 103         if (s->server) {
 104
 105                 if (s->context)
 106                         client_context_release(s->server, s->context);
 107
 108                 assert(s->server->n_stdout_streams > 0);
 109                 s->server->n_stdout_streams--;
 110                 LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
 111
 112                 if (s->in_notify_queue)
 113                         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 114         }
 115
 116         if (s->event_source) {
 117                 sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
 118                 s->event_source = sd_event_source_unref(s->event_source);
 119         }
 120
 121         safe_close(s->fd);
 122         free(s->label);
 123         free(s->identifier);
 124         free(s->unit_id);
 125         free(s->state_file);
 126         free(s->buffer);
 127
 128         free(s);
 129 }
 130
 131 DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
 132
 133 static void stdout_stream_destroy(StdoutStream *s) {
 134         if (!s)
 135                 return;
 136
 137         if (s->state_file)
 138                 (void) unlink(s->state_file);
 139
 140         stdout_stream_free(s);
 141 }
 142
 143 static int stdout_stream_save(StdoutStream *s) {
 144         _cleanup_free_ char *temp_path = NULL;
 145         _cleanup_fclose_ FILE *f = NULL;
 146         int r;
 147
 148         assert(s);
 149
 150         if (s->state != STDOUT_STREAM_RUNNING)
 151                 return 0;
 152
 153         if (!s->state_file) {
 154                 struct stat st;
 155
 156                 r = fstat(s->fd, &st);
 157                 if (r < 0)
 158                         return log_warning_errno(errno, "Failed to stat connected stream: %m");
 159
 160                 /* We use device and inode numbers as identifier for the stream */
 161                 if (asprintf(&s->state_file, "/run/systemd/journal/streams/%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
 162                         return log_oom();
 163         }
 164
 165         mkdir_p("/run/systemd/journal/streams", 0755);
 166
 167         r = fopen_temporary(s->state_file, &f, &temp_path);
 168         if (r < 0)
 169                 goto fail;
 170
 171         fprintf(f,
 172                 "# This is private data. Do not parse\n"
 173                 "PRIORITY=%i\n"
 174                 "LEVEL_PREFIX=%i\n"
 175                 "FORWARD_TO_SYSLOG=%i\n"
 176                 "FORWARD_TO_KMSG=%i\n"
 177                 "FORWARD_TO_CONSOLE=%i\n"
 178                 "STREAM_ID=%s\n",
 179                 s->priority,
 180                 s->level_prefix,
 181                 s->forward_to_syslog,
 182                 s->forward_to_kmsg,
 183                 s->forward_to_console,
 184                 s->id_field + STRLEN("_STREAM_ID="));
 185
 186         if (!isempty(s->identifier)) {
 187                 _cleanup_free_ char *escaped;
 188
 189                 escaped = cescape(s->identifier);
 190                 if (!escaped) {
 191                         r = -ENOMEM;
 192                         goto fail;
 193                 }
 194
 195                 fprintf(f, "IDENTIFIER=%s\n", escaped);
 196         }
 197
 198         if (!isempty(s->unit_id)) {
 199                 _cleanup_free_ char *escaped;
 200
 201                 escaped = cescape(s->unit_id);
 202                 if (!escaped) {
 203                         r = -ENOMEM;
 204                         goto fail;
 205                 }
 206
 207                 fprintf(f, "UNIT=%s\n", escaped);
 208         }
 209
 210         r = fflush_and_check(f);
 211         if (r < 0)
 212                 goto fail;
 213
 214         if (rename(temp_path, s->state_file) < 0) {
 215                 r = -errno;
 216                 goto fail;
 217         }
 218
 219         if (!s->fdstore && !s->in_notify_queue) {
 220                 LIST_PREPEND(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 221                 s->in_notify_queue = true;
 222
 223                 if (s->server->notify_event_source) {
 224                         r = sd_event_source_set_enabled(s->server->notify_event_source, SD_EVENT_ON);
 225                         if (r < 0)
 226                                 log_warning_errno(r, "Failed to enable notify event source: %m");
 227                 }
 228         }
 229
 230         return 0;
 231
 232 fail:
 233         (void) unlink(s->state_file);
 234
 235         if (temp_path)
 236                 (void) unlink(temp_path);
 237
 238         return log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
 239 }
 240
 241 static int stdout_stream_log(StdoutStream *s, const char *p, LineBreak line_break) {
 242         struct iovec *iovec;
 243         int priority;
 244         char syslog_priority[] = "PRIORITY=\0";
 245         char syslog_facility[STRLEN("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int) + 1];
 246         _cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
 247         size_t n = 0, m;
 248         int r;
 249
 250         assert(s);
 251         assert(p);
 252
 253         if (s->context)
 254                 (void) client_context_maybe_refresh(s->server, s->context, NULL, NULL, 0, NULL, USEC_INFINITY);
 255         else if (pid_is_valid(s->ucred.pid)) {
 256                 r = client_context_acquire(s->server, s->ucred.pid, &s->ucred, s->label, strlen_ptr(s->label), s->unit_id, &s->context);
 257                 if (r < 0)
 258                         log_warning_errno(r, "Failed to acquire client context, ignoring: %m");
 259         }
 260
 261         priority = s->priority;
 262
 263         if (s->level_prefix)
 264                 syslog_parse_priority(&p, &priority, false);
 265
 266         if (!client_context_test_priority(s->context, priority))
 267                 return 0;
 268
 269         if (isempty(p))
 270                 return 0;
 271
 272         if (s->forward_to_syslog || s->server->forward_to_syslog)
 273                 server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
 274
 275         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
 276                 server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
 277
 278         if (s->forward_to_console || s->server->forward_to_console)
 279                 server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
 280
 281         if (s->server->forward_to_wall)
 282                 server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
 283
 284         m = N_IOVEC_META_FIELDS + 7 + client_context_extra_fields_n_iovec(s->context);
 285         iovec = newa(struct iovec, m);
 286
 287         iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=stdout");
 288         iovec[n++] = IOVEC_MAKE_STRING(s->id_field);
 289
 290         syslog_priority[STRLEN("PRIORITY=")] = '0' + LOG_PRI(priority);
 291         iovec[n++] = IOVEC_MAKE_STRING(syslog_priority);
 292
 293         if (priority & LOG_FACMASK) {
 294                 xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
 295                 iovec[n++] = IOVEC_MAKE_STRING(syslog_facility);
 296         }
 297
 298         if (s->identifier) {
 299                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
 300                 if (syslog_identifier)
 301                         iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier);
 302         }
 303
 304         if (line_break != LINE_BREAK_NEWLINE) {
 305                 const char *c;
 306
 307                 /* If this log message was generated due to an uncommon line break then mention this in the log
 308                  * entry */
 309
 310                 c =     line_break == LINE_BREAK_NUL ?      "_LINE_BREAK=nul" :
 311                         line_break == LINE_BREAK_LINE_MAX ? "_LINE_BREAK=line-max" :
 312                                                             "_LINE_BREAK=eof";
 313                 iovec[n++] = IOVEC_MAKE_STRING(c);
 314         }
 315
 316         message = strappend("MESSAGE=", p);
 317         if (message)
 318                 iovec[n++] = IOVEC_MAKE_STRING(message);
 319
 320         server_dispatch_message(s->server, iovec, n, m, s->context, NULL, priority, 0);
 321         return 0;
 322 }
 323
 324 static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
 325         int r;
 326         char *orig;
 327
 328         assert(s);
 329         assert(p);
 330
 331         orig = p;
 332         p = strstrip(p);
 333
 334         /* line breaks by NUL, line max length or EOF are not permissible during the negotiation part of the protocol */
 335         if (line_break != LINE_BREAK_NEWLINE && s->state != STDOUT_STREAM_RUNNING) {
 336                 log_warning("Control protocol line not properly terminated.");
 337                 return -EINVAL;
 338         }
 339
 340         switch (s->state) {
 341
 342         case STDOUT_STREAM_IDENTIFIER:
 343                 if (!isempty(p)) {
 344                         s->identifier = strdup(p);
 345                         if (!s->identifier)
 346                                 return log_oom();
 347                 }
 348
 349                 s->state = STDOUT_STREAM_UNIT_ID;
 350                 return 0;
 351
 352         case STDOUT_STREAM_UNIT_ID:
 353                 if (s->ucred.uid == 0 &&
 354                     unit_name_is_valid(p, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
 355
 356                         s->unit_id = strdup(p);
 357                         if (!s->unit_id)
 358                                 return log_oom();
 359                 }
 360
 361                 s->state = STDOUT_STREAM_PRIORITY;
 362                 return 0;
 363
 364         case STDOUT_STREAM_PRIORITY:
 365                 r = safe_atoi(p, &s->priority);
 366                 if (r < 0 || s->priority < 0 || s->priority > 999) {
 367                         log_warning("Failed to parse log priority line.");
 368                         return -EINVAL;
 369                 }
 370
 371                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
 372                 return 0;
 373
 374         case STDOUT_STREAM_LEVEL_PREFIX:
 375                 r = parse_boolean(p);
 376                 if (r < 0) {
 377                         log_warning("Failed to parse level prefix line.");
 378                         return -EINVAL;
 379                 }
 380
 381                 s->level_prefix = !!r;
 382                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
 383                 return 0;
 384
 385         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
 386                 r = parse_boolean(p);
 387                 if (r < 0) {
 388                         log_warning("Failed to parse forward to syslog line.");
 389                         return -EINVAL;
 390                 }
 391
 392                 s->forward_to_syslog = !!r;
 393                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
 394                 return 0;
 395
 396         case STDOUT_STREAM_FORWARD_TO_KMSG:
 397                 r = parse_boolean(p);
 398                 if (r < 0) {
 399                         log_warning("Failed to parse copy to kmsg line.");
 400                         return -EINVAL;
 401                 }
 402
 403                 s->forward_to_kmsg = !!r;
 404                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
 405                 return 0;
 406
 407         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
 408                 r = parse_boolean(p);
 409                 if (r < 0) {
 410                         log_warning("Failed to parse copy to console line.");
 411                         return -EINVAL;
 412                 }
 413
 414                 s->forward_to_console = !!r;
 415                 s->state = STDOUT_STREAM_RUNNING;
 416
 417                 /* Try to save the stream, so that journald can be restarted and we can recover */
 418                 (void) stdout_stream_save(s);
 419                 return 0;
 420
 421         case STDOUT_STREAM_RUNNING:
 422                 return stdout_stream_log(s, orig, line_break);
 423         }
 424
 425         assert_not_reached("Unknown stream state");
 426 }
 427
 428 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 429         char *p;
 430         size_t remaining;
 431         int r;
 432
 433         assert(s);
 434
 435         p = s->buffer;
 436         remaining = s->length;
 437
 438         /* XXX: This function does nothing if (s->length == 0) */
 439
 440         for (;;) {
 441                 LineBreak line_break;
 442                 size_t skip;
 443                 char *end1, *end2;
 444
 445                 end1 = memchr(p, '\n', remaining);
 446                 end2 = memchr(p, 0, end1 ? (size_t) (end1 - p) : remaining);
 447
 448                 if (end2) {
 449                         /* We found a NUL terminator */
 450                         skip = end2 - p + 1;
 451                         line_break = LINE_BREAK_NUL;
 452                 } else if (end1) {
 453                         /* We found a \n terminator */
 454                         *end1 = 0;
 455                         skip = end1 - p + 1;
 456                         line_break = LINE_BREAK_NEWLINE;
 457                 } else if (remaining >= s->server->line_max) {
 458                         /* Force a line break after the maximum line length */
 459                         *(p + s->server->line_max) = 0;
 460                         skip = remaining;
 461                         line_break = LINE_BREAK_LINE_MAX;
 462                 } else
 463                         break;
 464
 465                 r = stdout_stream_line(s, p, line_break);
 466                 if (r < 0)
 467                         return r;
 468
 469                 remaining -= skip;
 470                 p += skip;
 471         }
 472
 473         if (force_flush && remaining > 0) {
 474                 p[remaining] = 0;
 475                 r = stdout_stream_line(s, p, LINE_BREAK_EOF);
 476                 if (r < 0)
 477                         return r;
 478
 479                 p += remaining;
 480                 remaining = 0;
 481         }
 482
 483         if (p > s->buffer) {
 484                 memmove(s->buffer, p, remaining);
 485                 s->length = remaining;
 486         }
 487
 488         return 0;
 489 }
 490
 491 static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 492         StdoutStream *s = userdata;
 493         size_t limit;
 494         ssize_t l;
 495         int r;
 496
 497         assert(s);
 498
 499         if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
 500                 log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
 501                 goto terminate;
 502         }
 503
 504         /* If the buffer is full already (discounting the extra NUL we need), add room for another 1K */
 505         if (s->length + 1 >= s->allocated) {
 506                 if (!GREEDY_REALLOC(s->buffer, s->allocated, s->length + 1 + 1024)) {
 507                         log_oom();
 508                         goto terminate;
 509                 }
 510         }
 511
 512         /* Try to make use of the allocated buffer in full, but never read more than the configured line size. Also,
 513          * always leave room for a terminating NUL we might need to add. */
 514         limit = MIN(s->allocated - 1, s->server->line_max);
 515
 516         l = read(s->fd, s->buffer + s->length, limit - s->length);
 517         if (l < 0) {
 518                 if (errno == EAGAIN)
 519                         return 0;
 520
 521                 log_warning_errno(errno, "Failed to read from stream: %m");
 522                 goto terminate;
 523         }
 524
 525         if (l == 0) {
 526                 stdout_stream_scan(s, true);
 527                 goto terminate;
 528         }
 529
 530         s->length += l;
 531         r = stdout_stream_scan(s, false);
 532         if (r < 0)
 533                 goto terminate;
 534
 535         return 1;
 536
 537 terminate:
 538         stdout_stream_destroy(s);
 539         return 0;
 540 }
 541
 542 static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
 543         _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
 544         sd_id128_t id;
 545         int r;
 546
 547         assert(s);
 548         assert(fd >= 0);
 549
 550         r = sd_id128_randomize(&id);
 551         if (r < 0)
 552                 return log_error_errno(r, "Failed to generate stream ID: %m");
 553
 554         stream = new0(StdoutStream, 1);
 555         if (!stream)
 556                 return log_oom();
 557
 558         stream->fd = -1;
 559         stream->priority = LOG_INFO;
 560
 561         xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
 562
 563         r = getpeercred(fd, &stream->ucred);
 564         if (r < 0)
 565                 return log_error_errno(r, "Failed to determine peer credentials: %m");
 566
 567         if (mac_selinux_use()) {
 568                 r = getpeersec(fd, &stream->label);
 569                 if (r < 0 && r != -EOPNOTSUPP)
 570                         (void) log_warning_errno(r, "Failed to determine peer security context: %m");
 571         }
 572
 573         (void) shutdown(fd, SHUT_WR);
 574
 575         r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
 576         if (r < 0)
 577                 return log_error_errno(r, "Failed to add stream to event loop: %m");
 578
 579         r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
 580         if (r < 0)
 581                 return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
 582
 583         stream->fd = fd;
 584
 585         stream->server = s;
 586         LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
 587         s->n_stdout_streams++;
 588
 589         if (ret)
 590                 *ret = stream;
 591
 592         stream = NULL;
 593
 594         return 0;
 595 }
 596
 597 static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
 598         _cleanup_close_ int fd = -1;
 599         Server *s = userdata;
 600         int r;
 601
 602         assert(s);
 603
 604         if (revents != EPOLLIN) {
 605                 log_error("Got invalid event from epoll for stdout server fd: %"PRIx32, revents);
 606                 return -EIO;
 607         }
 608
 609         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
 610         if (fd < 0) {
 611                 if (errno == EAGAIN)
 612                         return 0;
 613
 614                 return log_error_errno(errno, "Failed to accept stdout connection: %m");
 615         }
 616
 617         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 618                 log_warning("Too many stdout streams, refusing connection.");
 619                 return 0;
 620         }
 621
 622         r = stdout_stream_install(s, fd, NULL);
 623         if (r < 0)
 624                 return r;
 625
 626         fd = -1;
 627         return 0;
 628 }
 629
 630 static int stdout_stream_load(StdoutStream *stream, const char *fname) {
 631         _cleanup_free_ char
 632                 *priority = NULL,
 633                 *level_prefix = NULL,
 634                 *forward_to_syslog = NULL,
 635                 *forward_to_kmsg = NULL,
 636                 *forward_to_console = NULL,
 637                 *stream_id = NULL;
 638         int r;
 639
 640         assert(stream);
 641         assert(fname);
 642
 643         if (!stream->state_file) {
 644                 stream->state_file = strappend("/run/systemd/journal/streams/", fname);
 645                 if (!stream->state_file)
 646                         return log_oom();
 647         }
 648
 649         r = parse_env_file(stream->state_file, NEWLINE,
 650                            "PRIORITY", &priority,
 651                            "LEVEL_PREFIX", &level_prefix,
 652                            "FORWARD_TO_SYSLOG", &forward_to_syslog,
 653                            "FORWARD_TO_KMSG", &forward_to_kmsg,
 654                            "FORWARD_TO_CONSOLE", &forward_to_console,
 655                            "IDENTIFIER", &stream->identifier,
 656                            "UNIT", &stream->unit_id,
 657                            "STREAM_ID", &stream_id,
 658                            NULL);
 659         if (r < 0)
 660                 return log_error_errno(r, "Failed to read: %s", stream->state_file);
 661
 662         if (priority) {
 663                 int p;
 664
 665                 p = log_level_from_string(priority);
 666                 if (p >= 0)
 667                         stream->priority = p;
 668         }
 669
 670         if (level_prefix) {
 671                 r = parse_boolean(level_prefix);
 672                 if (r >= 0)
 673                         stream->level_prefix = r;
 674         }
 675
 676         if (forward_to_syslog) {
 677                 r = parse_boolean(forward_to_syslog);
 678                 if (r >= 0)
 679                         stream->forward_to_syslog = r;
 680         }
 681
 682         if (forward_to_kmsg) {
 683                 r = parse_boolean(forward_to_kmsg);
 684                 if (r >= 0)
 685                         stream->forward_to_kmsg = r;
 686         }
 687
 688         if (forward_to_console) {
 689                 r = parse_boolean(forward_to_console);
 690                 if (r >= 0)
 691                         stream->forward_to_console = r;
 692         }
 693
 694         if (stream_id) {
 695                 sd_id128_t id;
 696
 697                 r = sd_id128_from_string(stream_id, &id);
 698                 if (r >= 0)
 699                         xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
 700         }
 701
 702         return 0;
 703 }
 704
 705 static int stdout_stream_restore(Server *s, const char *fname, int fd) {
 706         StdoutStream *stream;
 707         int r;
 708
 709         assert(s);
 710         assert(fname);
 711         assert(fd >= 0);
 712
 713         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 714                 log_warning("Too many stdout streams, refusing restoring of stream.");
 715                 return -ENOBUFS;
 716         }
 717
 718         r = stdout_stream_install(s, fd, &stream);
 719         if (r < 0)
 720                 return r;
 721
 722         stream->state = STDOUT_STREAM_RUNNING;
 723         stream->fdstore = true;
 724
 725         /* Ignore all parsing errors */
 726         (void) stdout_stream_load(stream, fname);
 727
 728         return 0;
 729 }
 730
 731 int server_restore_streams(Server *s, FDSet *fds) {
 732         _cleanup_closedir_ DIR *d = NULL;
 733         struct dirent *de;
 734         int r;
 735
 736         d = opendir("/run/systemd/journal/streams");
 737         if (!d) {
 738                 if (errno == ENOENT)
 739                         return 0;
 740
 741                 return log_warning_errno(errno, "Failed to enumerate /run/systemd/journal/streams: %m");
 742         }
 743
 744         FOREACH_DIRENT(de, d, goto fail) {
 745                 unsigned long st_dev, st_ino;
 746                 bool found = false;
 747                 Iterator i;
 748                 int fd;
 749
 750                 if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
 751                         continue;
 752
 753                 FDSET_FOREACH(fd, fds, i) {
 754                         struct stat st;
 755
 756                         if (fstat(fd, &st) < 0)
 757                                 return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
 758
 759                         if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
 760                                 found = true;
 761                                 break;
 762                         }
 763                 }
 764
 765                 if (!found) {
 766                         /* No file descriptor? Then let's delete the state file */
 767                         log_debug("Cannot restore stream file %s", de->d_name);
 768                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 769                                 log_warning("Failed to remove /run/systemd/journal/streams/%s: %m",
 770                                             de->d_name);
 771                         continue;
 772                 }
 773
 774                 fdset_remove(fds, fd);
 775
 776                 r = stdout_stream_restore(s, de->d_name, fd);
 777                 if (r < 0)
 778                         safe_close(fd);
 779         }
 780
 781         return 0;
 782
 783 fail:
 784         return log_error_errno(errno, "Failed to read streams directory: %m");
 785 }
 786
 787 int server_open_stdout_socket(Server *s) {
 788         static const union sockaddr_union sa = {
 789                 .un.sun_family = AF_UNIX,
 790                 .un.sun_path = "/run/systemd/journal/stdout",
 791         };
 792         int r;
 793
 794         assert(s);
 795
 796         if (s->stdout_fd < 0) {
 797                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 798                 if (s->stdout_fd < 0)
 799                         return log_error_errno(errno, "socket() failed: %m");
 800
 801                 (void) unlink(sa.un.sun_path);
 802
 803                 r = bind(s->stdout_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
 804                 if (r < 0)
 805                         return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
 806
 807                 (void) chmod(sa.un.sun_path, 0666);
 808
 809                 if (listen(s->stdout_fd, SOMAXCONN) < 0)
 810                         return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
 811         } else
 812                 fd_nonblock(s->stdout_fd, 1);
 813
 814         r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
 815         if (r < 0)
 816                 return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
 817
 818         r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
 819         if (r < 0)
 820                 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
 821
 822         return 0;
 823 }
 824
 825 void stdout_stream_send_notify(StdoutStream *s) {
 826         struct iovec iovec = {
 827                 .iov_base = (char*) "FDSTORE=1",
 828                 .iov_len = STRLEN("FDSTORE=1"),
 829         };
 830         struct msghdr msghdr = {
 831                 .msg_iov = &iovec,
 832                 .msg_iovlen = 1,
 833         };
 834         struct cmsghdr *cmsg;
 835         ssize_t l;
 836
 837         assert(s);
 838         assert(!s->fdstore);
 839         assert(s->in_notify_queue);
 840         assert(s->server);
 841         assert(s->server->notify_fd >= 0);
 842
 843         /* Store the connection fd in PID 1, so that we get it passed
 844          * in again on next start */
 845
 846         msghdr.msg_controllen = CMSG_SPACE(sizeof(int));
 847         msghdr.msg_control = alloca0(msghdr.msg_controllen);
 848
 849         cmsg = CMSG_FIRSTHDR(&msghdr);
 850         cmsg->cmsg_level = SOL_SOCKET;
 851         cmsg->cmsg_type = SCM_RIGHTS;
 852         cmsg->cmsg_len = CMSG_LEN(sizeof(int));
 853
 854         memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int));
 855
 856         l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL);
 857         if (l < 0) {
 858                 if (errno == EAGAIN)
 859                         return;
 860
 861                 log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m");
 862         } else {
 863                 log_debug("Successfully sent stream file descriptor to service manager.");
 864                 s->fdstore = 1;
 865         }
 866
 867         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 868         s->in_notify_queue = false;
 869
 870 }