src/journal/journald-stream.c

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