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