src/journal/journald-stream.c

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