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 #if 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;
 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         size_t n = 0, m;
 260         int r;
 261
 262         assert(s);
 263         assert(p);
 264
 265         if (s->context)
 266                 (void) client_context_maybe_refresh(s->server, s->context, NULL, NULL, 0, NULL, USEC_INFINITY);
 267         else if (pid_is_valid(s->ucred.pid)) {
 268                 r = client_context_acquire(s->server, s->ucred.pid, &s->ucred, s->label, strlen_ptr(s->label), s->unit_id, &s->context);
 269                 if (r < 0)
 270                         log_warning_errno(r, "Failed to acquire client context, ignoring: %m");
 271         }
 272
 273         priority = s->priority;
 274
 275         if (s->level_prefix)
 276                 syslog_parse_priority(&p, &priority, false);
 277
 278         if (!client_context_test_priority(s->context, priority))
 279                 return 0;
 280
 281         if (isempty(p))
 282                 return 0;
 283
 284         if (s->forward_to_syslog || s->server->forward_to_syslog)
 285                 server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
 286
 287         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
 288                 server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
 289
 290         if (s->forward_to_console || s->server->forward_to_console)
 291                 server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
 292
 293         if (s->server->forward_to_wall)
 294                 server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
 295
 296         m = N_IOVEC_META_FIELDS + 7 + client_context_extra_fields_n_iovec(s->context);
 297         iovec = newa(struct iovec, m);
 298
 299         iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=stdout");
 300         iovec[n++] = IOVEC_MAKE_STRING(s->id_field);
 301
 302         syslog_priority[strlen("PRIORITY=")] = '0' + LOG_PRI(priority);
 303         iovec[n++] = IOVEC_MAKE_STRING(syslog_priority);
 304
 305         if (priority & LOG_FACMASK) {
 306                 xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
 307                 iovec[n++] = IOVEC_MAKE_STRING(syslog_facility);
 308         }
 309
 310         if (s->identifier) {
 311                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
 312                 if (syslog_identifier)
 313                         iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier);
 314         }
 315
 316         if (line_break != LINE_BREAK_NEWLINE) {
 317                 const char *c;
 318
 319                 /* If this log message was generated due to an uncommon line break then mention this in the log
 320                  * entry */
 321
 322                 c =     line_break == LINE_BREAK_NUL ?      "_LINE_BREAK=nul" :
 323                         line_break == LINE_BREAK_LINE_MAX ? "_LINE_BREAK=line-max" :
 324                                                             "_LINE_BREAK=eof";
 325                 iovec[n++] = IOVEC_MAKE_STRING(c);
 326         }
 327
 328         message = strappend("MESSAGE=", p);
 329         if (message)
 330                 iovec[n++] = IOVEC_MAKE_STRING(message);
 331
 332         server_dispatch_message(s->server, iovec, n, m, s->context, NULL, priority, 0);
 333         return 0;
 334 }
 335
 336 static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
 337         int r;
 338         char *orig;
 339
 340         assert(s);
 341         assert(p);
 342
 343         orig = p;
 344         p = strstrip(p);
 345
 346         /* line breaks by NUL, line max length or EOF are not permissible during the negotiation part of the protocol */
 347         if (line_break != LINE_BREAK_NEWLINE && s->state != STDOUT_STREAM_RUNNING) {
 348                 log_warning("Control protocol line not properly terminated.");
 349                 return -EINVAL;
 350         }
 351
 352         switch (s->state) {
 353
 354         case STDOUT_STREAM_IDENTIFIER:
 355                 if (!isempty(p)) {
 356                         s->identifier = strdup(p);
 357                         if (!s->identifier)
 358                                 return log_oom();
 359                 }
 360
 361                 s->state = STDOUT_STREAM_UNIT_ID;
 362                 return 0;
 363
 364         case STDOUT_STREAM_UNIT_ID:
 365                 if (s->ucred.uid == 0 &&
 366                     unit_name_is_valid(p, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
 367
 368                         s->unit_id = strdup(p);
 369                         if (!s->unit_id)
 370                                 return log_oom();
 371                 }
 372
 373                 s->state = STDOUT_STREAM_PRIORITY;
 374                 return 0;
 375
 376         case STDOUT_STREAM_PRIORITY:
 377                 r = safe_atoi(p, &s->priority);
 378                 if (r < 0 || s->priority < 0 || s->priority > 999) {
 379                         log_warning("Failed to parse log priority line.");
 380                         return -EINVAL;
 381                 }
 382
 383                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
 384                 return 0;
 385
 386         case STDOUT_STREAM_LEVEL_PREFIX:
 387                 r = parse_boolean(p);
 388                 if (r < 0) {
 389                         log_warning("Failed to parse level prefix line.");
 390                         return -EINVAL;
 391                 }
 392
 393                 s->level_prefix = !!r;
 394                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
 395                 return 0;
 396
 397         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
 398                 r = parse_boolean(p);
 399                 if (r < 0) {
 400                         log_warning("Failed to parse forward to syslog line.");
 401                         return -EINVAL;
 402                 }
 403
 404                 s->forward_to_syslog = !!r;
 405                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
 406                 return 0;
 407
 408         case STDOUT_STREAM_FORWARD_TO_KMSG:
 409                 r = parse_boolean(p);
 410                 if (r < 0) {
 411                         log_warning("Failed to parse copy to kmsg line.");
 412                         return -EINVAL;
 413                 }
 414
 415                 s->forward_to_kmsg = !!r;
 416                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
 417                 return 0;
 418
 419         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
 420                 r = parse_boolean(p);
 421                 if (r < 0) {
 422                         log_warning("Failed to parse copy to console line.");
 423                         return -EINVAL;
 424                 }
 425
 426                 s->forward_to_console = !!r;
 427                 s->state = STDOUT_STREAM_RUNNING;
 428
 429                 /* Try to save the stream, so that journald can be restarted and we can recover */
 430                 (void) stdout_stream_save(s);
 431                 return 0;
 432
 433         case STDOUT_STREAM_RUNNING:
 434                 return stdout_stream_log(s, orig, line_break);
 435         }
 436
 437         assert_not_reached("Unknown stream state");
 438 }
 439
 440 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 441         char *p;
 442         size_t remaining;
 443         int r;
 444
 445         assert(s);
 446
 447         p = s->buffer;
 448         remaining = s->length;
 449
 450         /* XXX: This function does nothing if (s->length == 0) */
 451
 452         for (;;) {
 453                 LineBreak line_break;
 454                 size_t skip;
 455                 char *end1, *end2;
 456
 457                 end1 = memchr(p, '\n', remaining);
 458                 end2 = memchr(p, 0, end1 ? (size_t) (end1 - p) : remaining);
 459
 460                 if (end2) {
 461                         /* We found a NUL terminator */
 462                         skip = end2 - p + 1;
 463                         line_break = LINE_BREAK_NUL;
 464                 } else if (end1) {
 465                         /* We found a \n terminator */
 466                         *end1 = 0;
 467                         skip = end1 - p + 1;
 468                         line_break = LINE_BREAK_NEWLINE;
 469                 } else if (remaining >= s->server->line_max) {
 470                         /* Force a line break after the maximum line length */
 471                         *(p + s->server->line_max) = 0;
 472                         skip = remaining;
 473                         line_break = LINE_BREAK_LINE_MAX;
 474                 } else
 475                         break;
 476
 477                 r = stdout_stream_line(s, p, line_break);
 478                 if (r < 0)
 479                         return r;
 480
 481                 remaining -= skip;
 482                 p += skip;
 483         }
 484
 485         if (force_flush && remaining > 0) {
 486                 p[remaining] = 0;
 487                 r = stdout_stream_line(s, p, LINE_BREAK_EOF);
 488                 if (r < 0)
 489                         return r;
 490
 491                 p += remaining;
 492                 remaining = 0;
 493         }
 494
 495         if (p > s->buffer) {
 496                 memmove(s->buffer, p, remaining);
 497                 s->length = remaining;
 498         }
 499
 500         return 0;
 501 }
 502
 503 static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 504         StdoutStream *s = userdata;
 505         size_t limit;
 506         ssize_t l;
 507         int r;
 508
 509         assert(s);
 510
 511         if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
 512                 log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
 513                 goto terminate;
 514         }
 515
 516         /* If the buffer is full already (discounting the extra NUL we need), add room for another 1K */
 517         if (s->length + 1 >= s->allocated) {
 518                 if (!GREEDY_REALLOC(s->buffer, s->allocated, s->length + 1 + 1024)) {
 519                         log_oom();
 520                         goto terminate;
 521                 }
 522         }
 523
 524         /* Try to make use of the allocated buffer in full, but never read more than the configured line size. Also,
 525          * always leave room for a terminating NUL we might need to add. */
 526         limit = MIN(s->allocated - 1, s->server->line_max);
 527
 528         l = read(s->fd, s->buffer + s->length, limit - s->length);
 529         if (l < 0) {
 530                 if (errno == EAGAIN)
 531                         return 0;
 532
 533                 log_warning_errno(errno, "Failed to read from stream: %m");
 534                 goto terminate;
 535         }
 536
 537         if (l == 0) {
 538                 stdout_stream_scan(s, true);
 539                 goto terminate;
 540         }
 541
 542         s->length += l;
 543         r = stdout_stream_scan(s, false);
 544         if (r < 0)
 545                 goto terminate;
 546
 547         return 1;
 548
 549 terminate:
 550         stdout_stream_destroy(s);
 551         return 0;
 552 }
 553
 554 static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
 555         _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
 556         sd_id128_t id;
 557         int r;
 558
 559         assert(s);
 560         assert(fd >= 0);
 561
 562         r = sd_id128_randomize(&id);
 563         if (r < 0)
 564                 return log_error_errno(r, "Failed to generate stream ID: %m");
 565
 566         stream = new0(StdoutStream, 1);
 567         if (!stream)
 568                 return log_oom();
 569
 570         stream->fd = -1;
 571         stream->priority = LOG_INFO;
 572
 573         xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
 574
 575         r = getpeercred(fd, &stream->ucred);
 576         if (r < 0)
 577                 return log_error_errno(r, "Failed to determine peer credentials: %m");
 578
 579         if (mac_selinux_use()) {
 580                 r = getpeersec(fd, &stream->label);
 581                 if (r < 0 && r != -EOPNOTSUPP)
 582                         (void) log_warning_errno(r, "Failed to determine peer security context: %m");
 583         }
 584
 585         (void) shutdown(fd, SHUT_WR);
 586
 587         r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
 588         if (r < 0)
 589                 return log_error_errno(r, "Failed to add stream to event loop: %m");
 590
 591         r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
 592         if (r < 0)
 593                 return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
 594
 595         stream->fd = fd;
 596
 597         stream->server = s;
 598         LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
 599         s->n_stdout_streams++;
 600
 601         if (ret)
 602                 *ret = stream;
 603
 604         stream = NULL;
 605
 606         return 0;
 607 }
 608
 609 static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
 610         _cleanup_close_ int fd = -1;
 611         Server *s = userdata;
 612         int r;
 613
 614         assert(s);
 615
 616         if (revents != EPOLLIN) {
 617                 log_error("Got invalid event from epoll for stdout server fd: %"PRIx32, revents);
 618                 return -EIO;
 619         }
 620
 621         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
 622         if (fd < 0) {
 623                 if (errno == EAGAIN)
 624                         return 0;
 625
 626                 return log_error_errno(errno, "Failed to accept stdout connection: %m");
 627         }
 628
 629         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 630                 log_warning("Too many stdout streams, refusing connection.");
 631                 return 0;
 632         }
 633
 634         r = stdout_stream_install(s, fd, NULL);
 635         if (r < 0)
 636                 return r;
 637
 638         fd = -1;
 639         return 0;
 640 }
 641
 642 static int stdout_stream_load(StdoutStream *stream, const char *fname) {
 643         _cleanup_free_ char
 644                 *priority = NULL,
 645                 *level_prefix = NULL,
 646                 *forward_to_syslog = NULL,
 647                 *forward_to_kmsg = NULL,
 648                 *forward_to_console = NULL,
 649                 *stream_id = NULL;
 650         int r;
 651
 652         assert(stream);
 653         assert(fname);
 654
 655         if (!stream->state_file) {
 656                 stream->state_file = strappend("/run/systemd/journal/streams/", fname);
 657                 if (!stream->state_file)
 658                         return log_oom();
 659         }
 660
 661         r = parse_env_file(stream->state_file, NEWLINE,
 662                            "PRIORITY", &priority,
 663                            "LEVEL_PREFIX", &level_prefix,
 664                            "FORWARD_TO_SYSLOG", &forward_to_syslog,
 665                            "FORWARD_TO_KMSG", &forward_to_kmsg,
 666                            "FORWARD_TO_CONSOLE", &forward_to_console,
 667                            "IDENTIFIER", &stream->identifier,
 668                            "UNIT", &stream->unit_id,
 669                            "STREAM_ID", &stream_id,
 670                            NULL);
 671         if (r < 0)
 672                 return log_error_errno(r, "Failed to read: %s", stream->state_file);
 673
 674         if (priority) {
 675                 int p;
 676
 677                 p = log_level_from_string(priority);
 678                 if (p >= 0)
 679                         stream->priority = p;
 680         }
 681
 682         if (level_prefix) {
 683                 r = parse_boolean(level_prefix);
 684                 if (r >= 0)
 685                         stream->level_prefix = r;
 686         }
 687
 688         if (forward_to_syslog) {
 689                 r = parse_boolean(forward_to_syslog);
 690                 if (r >= 0)
 691                         stream->forward_to_syslog = r;
 692         }
 693
 694         if (forward_to_kmsg) {
 695                 r = parse_boolean(forward_to_kmsg);
 696                 if (r >= 0)
 697                         stream->forward_to_kmsg = r;
 698         }
 699
 700         if (forward_to_console) {
 701                 r = parse_boolean(forward_to_console);
 702                 if (r >= 0)
 703                         stream->forward_to_console = r;
 704         }
 705
 706         if (stream_id) {
 707                 sd_id128_t id;
 708
 709                 r = sd_id128_from_string(stream_id, &id);
 710                 if (r >= 0)
 711                         xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
 712         }
 713
 714         return 0;
 715 }
 716
 717 static int stdout_stream_restore(Server *s, const char *fname, int fd) {
 718         StdoutStream *stream;
 719         int r;
 720
 721         assert(s);
 722         assert(fname);
 723         assert(fd >= 0);
 724
 725         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 726                 log_warning("Too many stdout streams, refusing restoring of stream.");
 727                 return -ENOBUFS;
 728         }
 729
 730         r = stdout_stream_install(s, fd, &stream);
 731         if (r < 0)
 732                 return r;
 733
 734         stream->state = STDOUT_STREAM_RUNNING;
 735         stream->fdstore = true;
 736
 737         /* Ignore all parsing errors */
 738         (void) stdout_stream_load(stream, fname);
 739
 740         return 0;
 741 }
 742
 743 int server_restore_streams(Server *s, FDSet *fds) {
 744         _cleanup_closedir_ DIR *d = NULL;
 745         struct dirent *de;
 746         int r;
 747
 748         d = opendir("/run/systemd/journal/streams");
 749         if (!d) {
 750                 if (errno == ENOENT)
 751                         return 0;
 752
 753                 return log_warning_errno(errno, "Failed to enumerate /run/systemd/journal/streams: %m");
 754         }
 755
 756         FOREACH_DIRENT(de, d, goto fail) {
 757                 unsigned long st_dev, st_ino;
 758                 bool found = false;
 759                 Iterator i;
 760                 int fd;
 761
 762                 if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
 763                         continue;
 764
 765                 FDSET_FOREACH(fd, fds, i) {
 766                         struct stat st;
 767
 768                         if (fstat(fd, &st) < 0)
 769                                 return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
 770
 771                         if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
 772                                 found = true;
 773                                 break;
 774                         }
 775                 }
 776
 777                 if (!found) {
 778                         /* No file descriptor? Then let's delete the state file */
 779                         log_debug("Cannot restore stream file %s", de->d_name);
 780                         unlinkat(dirfd(d), de->d_name, 0);
 781                         continue;
 782                 }
 783
 784                 fdset_remove(fds, fd);
 785
 786                 r = stdout_stream_restore(s, de->d_name, fd);
 787                 if (r < 0)
 788                         safe_close(fd);
 789         }
 790
 791         return 0;
 792
 793 fail:
 794         return log_error_errno(errno, "Failed to read streams directory: %m");
 795 }
 796
 797 int server_open_stdout_socket(Server *s) {
 798         static const union sockaddr_union sa = {
 799                 .un.sun_family = AF_UNIX,
 800                 .un.sun_path = "/run/systemd/journal/stdout",
 801         };
 802         int r;
 803
 804         assert(s);
 805
 806         if (s->stdout_fd < 0) {
 807                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 808                 if (s->stdout_fd < 0)
 809                         return log_error_errno(errno, "socket() failed: %m");
 810
 811                 (void) unlink(sa.un.sun_path);
 812
 813                 r = bind(s->stdout_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
 814                 if (r < 0)
 815                         return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
 816
 817                 (void) chmod(sa.un.sun_path, 0666);
 818
 819                 if (listen(s->stdout_fd, SOMAXCONN) < 0)
 820                         return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
 821         } else
 822                 fd_nonblock(s->stdout_fd, 1);
 823
 824         r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
 825         if (r < 0)
 826                 return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
 827
 828         r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
 829         if (r < 0)
 830                 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
 831
 832         return 0;
 833 }
 834
 835 void stdout_stream_send_notify(StdoutStream *s) {
 836         struct iovec iovec = {
 837                 .iov_base = (char*) "FDSTORE=1",
 838                 .iov_len = strlen("FDSTORE=1"),
 839         };
 840         struct msghdr msghdr = {
 841                 .msg_iov = &iovec,
 842                 .msg_iovlen = 1,
 843         };
 844         struct cmsghdr *cmsg;
 845         ssize_t l;
 846
 847         assert(s);
 848         assert(!s->fdstore);
 849         assert(s->in_notify_queue);
 850         assert(s->server);
 851         assert(s->server->notify_fd >= 0);
 852
 853         /* Store the connection fd in PID 1, so that we get it passed
 854          * in again on next start */
 855
 856         msghdr.msg_controllen = CMSG_SPACE(sizeof(int));
 857         msghdr.msg_control = alloca0(msghdr.msg_controllen);
 858
 859         cmsg = CMSG_FIRSTHDR(&msghdr);
 860         cmsg->cmsg_level = SOL_SOCKET;
 861         cmsg->cmsg_type = SCM_RIGHTS;
 862         cmsg->cmsg_len = CMSG_LEN(sizeof(int));
 863
 864         memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int));
 865
 866         l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL);
 867         if (l < 0) {
 868                 if (errno == EAGAIN)
 869                         return;
 870
 871                 log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m");
 872         } else {
 873                 log_debug("Successfully sent stream file descriptor to service manager.");
 874                 s->fdstore = 1;
 875         }
 876
 877         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 878         s->in_notify_queue = false;
 879
 880 }