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