src/journal/journald.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/epoll.h>
  23 #include <sys/socket.h>
  24 #include <errno.h>
  25 #include <sys/signalfd.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <sys/acl.h>
  29 #include <acl/libacl.h>
  30 #include <stddef.h>
  31 #include <sys/ioctl.h>
  32 #include <linux/sockios.h>
  33
  34 #include "hashmap.h"
  35 #include "journal-file.h"
  36 #include "sd-daemon.h"
  37 #include "socket-util.h"
  38 #include "acl-util.h"
  39 #include "cgroup-util.h"
  40 #include "list.h"
  41
  42 #define USER_JOURNALS_MAX 1024
  43 #define STDOUT_STREAMS_MAX 4096
  44
  45 typedef struct StdoutStream StdoutStream;
  46
  47 typedef struct Server {
  48         int epoll_fd;
  49         int signal_fd;
  50         int syslog_fd;
  51         int native_fd;
  52         int stdout_fd;
  53
  54         JournalFile *runtime_journal;
  55         JournalFile *system_journal;
  56         Hashmap *user_journals;
  57
  58         uint64_t seqnum;
  59
  60         char *buffer;
  61         size_t buffer_size;
  62
  63         JournalMetrics metrics;
  64         uint64_t max_use;
  65         bool compress;
  66
  67         LIST_HEAD(StdoutStream, stdout_streams);
  68         unsigned n_stdout_streams;
  69 } Server;
  70
  71 typedef enum StdoutStreamState {
  72         STDOUT_STREAM_TAG,
  73         STDOUT_STREAM_PRIORITY,
  74         STDOUT_STREAM_PRIORITY_PREFIX,
  75         STDOUT_STREAM_TEE_CONSOLE,
  76         STDOUT_STREAM_RUNNING
  77 } StdoutStreamState;
  78
  79 struct StdoutStream {
  80         Server *server;
  81         StdoutStreamState state;
  82
  83         int fd;
  84
  85         struct ucred ucred;
  86
  87         char *tag;
  88         int priority;
  89         bool priority_prefix:1;
  90         bool tee_console:1;
  91
  92         char buffer[LINE_MAX+1];
  93         size_t length;
  94
  95         LIST_FIELDS(StdoutStream, stdout_stream);
  96 };
  97
  98 static void fix_perms(JournalFile *f, uid_t uid) {
  99         acl_t acl;
 100         acl_entry_t entry;
 101         acl_permset_t permset;
 102         int r;
 103
 104         assert(f);
 105
 106         r = fchmod_and_fchown(f->fd, 0640, 0, 0);
 107         if (r < 0)
 108                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
 109
 110         if (uid <= 0)
 111                 return;
 112
 113         acl = acl_get_fd(f->fd);
 114         if (!acl) {
 115                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
 116                 return;
 117         }
 118
 119         r = acl_find_uid(acl, uid, &entry);
 120         if (r <= 0) {
 121
 122                 if (acl_create_entry(&acl, &entry) < 0 ||
 123                     acl_set_tag_type(entry, ACL_USER) < 0 ||
 124                     acl_set_qualifier(entry, &uid) < 0) {
 125                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 126                         goto finish;
 127                 }
 128         }
 129
 130         if (acl_get_permset(entry, &permset) < 0 ||
 131             acl_add_perm(permset, ACL_READ) < 0 ||
 132             acl_calc_mask(&acl) < 0) {
 133                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 134                 goto finish;
 135         }
 136
 137         if (acl_set_fd(f->fd, acl) < 0)
 138                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
 139
 140 finish:
 141         acl_free(acl);
 142 }
 143
 144 static JournalFile* find_journal(Server *s, uid_t uid) {
 145         char *p;
 146         int r;
 147         JournalFile *f;
 148         char ids[33];
 149         sd_id128_t machine;
 150
 151         assert(s);
 152
 153         /* We split up user logs only on /var, not on /run */
 154         if (!s->system_journal)
 155                 return s->runtime_journal;
 156
 157         if (uid <= 0)
 158                 return s->system_journal;
 159
 160         r = sd_id128_get_machine(&machine);
 161         if (r < 0)
 162                 return s->system_journal;
 163
 164         f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
 165         if (f)
 166                 return f;
 167
 168         if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
 169                 return s->system_journal;
 170
 171         while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
 172                 /* Too many open? Then let's close one */
 173                 f = hashmap_steal_first(s->user_journals);
 174                 assert(f);
 175                 journal_file_close(f);
 176         }
 177
 178         r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
 179         free(p);
 180
 181         if (r < 0)
 182                 return s->system_journal;
 183
 184         fix_perms(f, uid);
 185         f->metrics = s->metrics;
 186         f->compress = s->compress;
 187
 188         r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
 189         if (r < 0) {
 190                 journal_file_close(f);
 191                 return s->system_journal;
 192         }
 193
 194         return f;
 195 }
 196
 197 static void server_vacuum(Server *s) {
 198         Iterator i;
 199         void *k;
 200         char *p;
 201         char ids[33];
 202         sd_id128_t machine;
 203         int r;
 204         JournalFile *f;
 205
 206         log_info("Rotating...");
 207
 208         if (s->runtime_journal) {
 209                 r = journal_file_rotate(&s->runtime_journal);
 210                 if (r < 0)
 211                         log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
 212         }
 213
 214         if (s->system_journal) {
 215                 r = journal_file_rotate(&s->system_journal);
 216                 if (r < 0)
 217                         log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
 218         }
 219
 220         HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
 221                 r = journal_file_rotate(&f);
 222                 if (r < 0)
 223                         log_error("Failed to rotate %s: %s", f->path, strerror(-r));
 224                 else
 225                         hashmap_replace(s->user_journals, k, f);
 226         }
 227
 228         log_info("Vacuuming...");
 229
 230         r = sd_id128_get_machine(&machine);
 231         if (r < 0) {
 232                 log_error("Failed to get machine ID: %s", strerror(-r));
 233                 return;
 234         }
 235
 236         if (asprintf(&p, "/var/log/journal/%s", sd_id128_to_string(machine, ids)) < 0) {
 237                 log_error("Out of memory.");
 238                 return;
 239         }
 240
 241         r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);
 242         if (r < 0 && r != -ENOENT)
 243                 log_error("Failed to vacuum %s: %s", p, strerror(-r));
 244         free(p);
 245
 246         if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
 247                 log_error("Out of memory.");
 248                 return;
 249         }
 250
 251         r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);
 252         if (r < 0 && r != -ENOENT)
 253                 log_error("Failed to vacuum %s: %s", p, strerror(-r));
 254         free(p);
 255 }
 256
 257 static void dispatch_message(Server *s, struct iovec *iovec, unsigned n, unsigned m, struct ucred *ucred, struct timeval *tv) {
 258         char *pid = NULL, *uid = NULL, *gid = NULL,
 259                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 260                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 261                 *audit_session = NULL, *audit_loginuid = NULL,
 262                 *exe = NULL, *cgroup = NULL;
 263
 264         char idbuf[33];
 265         sd_id128_t id;
 266         int r;
 267         char *t;
 268         uid_t loginuid = 0, realuid = 0;
 269         JournalFile *f;
 270         bool vacuumed = false;
 271
 272         assert(s);
 273         assert(iovec || n == 0);
 274
 275         if (n == 0)
 276                 return;
 277
 278         assert(n + 13 <= m);
 279
 280         if (ucred) {
 281                 uint32_t session;
 282                 char *path;
 283
 284                 realuid = ucred->uid;
 285
 286                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 287                         IOVEC_SET_STRING(iovec[n++], pid);
 288
 289                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 290                         IOVEC_SET_STRING(iovec[n++], uid);
 291
 292                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 293                         IOVEC_SET_STRING(iovec[n++], gid);
 294
 295                 r = get_process_comm(ucred->pid, &t);
 296                 if (r >= 0) {
 297                         comm = strappend("_COMM=", t);
 298                         if (comm)
 299                                 IOVEC_SET_STRING(iovec[n++], comm);
 300                         free(t);
 301                 }
 302
 303                 r = get_process_exe(ucred->pid, &t);
 304                 if (r >= 0) {
 305                         exe = strappend("_EXE=", t);
 306                         if (comm)
 307                                 IOVEC_SET_STRING(iovec[n++], exe);
 308                         free(t);
 309                 }
 310
 311                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 312                 if (r >= 0) {
 313                         cmdline = strappend("_CMDLINE=", t);
 314                         if (cmdline)
 315                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 316                         free(t);
 317                 }
 318
 319                 r = audit_session_from_pid(ucred->pid, &session);
 320                 if (r >= 0)
 321                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0)
 322                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 323
 324                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 325                 if (r >= 0)
 326                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 327                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 328
 329                 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, ucred->pid, &path);
 330                 if (r >= 0) {
 331                         cgroup = strappend("_SYSTEMD_CGROUP=", path);
 332                         if (cgroup)
 333                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 334                         free(path);
 335                 }
 336         }
 337
 338         if (tv) {
 339                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 340                              (unsigned long long) timeval_load(tv)) >= 0)
 341                         IOVEC_SET_STRING(iovec[n++], source_time);
 342         }
 343
 344         /* Note that strictly speaking storing the boot id here is
 345          * redundant since the entry includes this in-line
 346          * anyway. However, we need this indexed, too. */
 347         r = sd_id128_get_boot(&id);
 348         if (r >= 0)
 349                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 350                         IOVEC_SET_STRING(iovec[n++], boot_id);
 351
 352         r = sd_id128_get_machine(&id);
 353         if (r >= 0)
 354                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 355                         IOVEC_SET_STRING(iovec[n++], machine_id);
 356
 357         t = gethostname_malloc();
 358         if (t) {
 359                 hostname = strappend("_HOSTNAME=", t);
 360                 if (hostname)
 361                         IOVEC_SET_STRING(iovec[n++], hostname);
 362                 free(t);
 363         }
 364
 365         assert(n <= m);
 366
 367 retry:
 368         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 369         if (!f)
 370                 log_warning("Dropping message, as we can't find a place to store the data.");
 371         else {
 372                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 373
 374                 if (r == -E2BIG && !vacuumed) {
 375                         log_info("Allocation limit reached.");
 376
 377                         server_vacuum(s);
 378                         vacuumed = true;
 379
 380                         log_info("Retrying write.");
 381                         goto retry;
 382                 }
 383
 384                 if (r < 0)
 385                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 386         }
 387
 388         free(pid);
 389         free(uid);
 390         free(gid);
 391         free(comm);
 392         free(exe);
 393         free(cmdline);
 394         free(source_time);
 395         free(boot_id);
 396         free(machine_id);
 397         free(hostname);
 398         free(audit_session);
 399         free(audit_loginuid);
 400         free(cgroup);
 401 }
 402
 403 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
 404         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL;
 405         struct iovec iovec[16];
 406         unsigned n = 0;
 407         int priority = LOG_USER | LOG_INFO;
 408
 409         assert(s);
 410         assert(buf);
 411
 412         parse_syslog_priority((char**) &buf, &priority);
 413         skip_syslog_date((char**) &buf);
 414
 415         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
 416                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 417
 418         if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
 419                 IOVEC_SET_STRING(iovec[n++], syslog_facility);
 420
 421         message = strappend("MESSAGE=", buf);
 422         if (message)
 423                 IOVEC_SET_STRING(iovec[n++], message);
 424
 425         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv);
 426
 427         free(message);
 428         free(syslog_facility);
 429         free(syslog_priority);
 430 }
 431
 432 static bool valid_user_field(const char *p, size_t l) {
 433         const char *a;
 434
 435         /* We kinda enforce POSIX syntax recommendations for
 436            environment variables here, but make a couple of additional
 437            requirements.
 438
 439            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
 440
 441         /* No empty field names */
 442         if (l <= 0)
 443                 return false;
 444
 445         /* Don't allow names longer than 64 chars */
 446         if (l > 64)
 447                 return false;
 448
 449         /* Variables starting with an underscore are protected */
 450         if (p[0] == '_')
 451                 return false;
 452
 453         /* Don't allow digits as first character */
 454         if (p[0] >= '0' && p[0] <= '9')
 455                 return false;
 456
 457         /* Only allow A-Z0-9 and '_' */
 458         for (a = p; a < p + l; a++)
 459                 if (!((*a >= 'A' && *a <= 'Z') ||
 460                       (*a >= '0' && *a <= '9') ||
 461                       *a == '_'))
 462                         return false;
 463
 464         return true;
 465 }
 466
 467 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
 468         struct iovec *iovec = NULL;
 469         unsigned n = 0, m = 0, j;
 470         const char *p;
 471         size_t remaining;
 472
 473         assert(s);
 474         assert(buffer || n == 0);
 475
 476         p = buffer;
 477         remaining = buffer_size;
 478
 479         while (remaining > 0) {
 480                 const char *e, *q;
 481
 482                 e = memchr(p, '\n', remaining);
 483
 484                 if (!e) {
 485                         /* Trailing noise, let's ignore it, and flush what we collected */
 486                         log_debug("Received message with trailing noise, ignoring.");
 487                         break;
 488                 }
 489
 490                 if (e == p) {
 491                         /* Entry separator */
 492                         dispatch_message(s, iovec, n, m, ucred, tv);
 493                         n = 0;
 494
 495                         p++;
 496                         remaining--;
 497                         continue;
 498                 }
 499
 500                 if (*p == '.' || *p == '#') {
 501                         /* Ignore control commands for now, and
 502                          * comments too. */
 503                         remaining -= (e - p) + 1;
 504                         p = e + 1;
 505                         continue;
 506                 }
 507
 508                 /* A property follows */
 509
 510                 if (n+13 >= m) {
 511                         struct iovec *c;
 512                         unsigned u;
 513
 514                         u = MAX((n+13U) * 2U, 4U);
 515                         c = realloc(iovec, u * sizeof(struct iovec));
 516                         if (!c) {
 517                                 log_error("Out of memory");
 518                                 break;
 519                         }
 520
 521                         iovec = c;
 522                         m = u;
 523                 }
 524
 525                 q = memchr(p, '=', e - p);
 526                 if (q) {
 527                         if (valid_user_field(p, q - p)) {
 528                                 /* If the field name starts with an
 529                                  * underscore, skip the variable,
 530                                  * since that indidates a trusted
 531                                  * field */
 532                                 iovec[n].iov_base = (char*) p;
 533                                 iovec[n].iov_len = e - p;
 534                                 n++;
 535                         }
 536
 537                         remaining -= (e - p) + 1;
 538                         p = e + 1;
 539                         continue;
 540                 } else {
 541                         uint64_t l;
 542                         char *k;
 543
 544                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
 545                                 log_debug("Failed to parse message, ignoring.");
 546                                 break;
 547                         }
 548
 549                         memcpy(&l, e + 1, sizeof(uint64_t));
 550                         l = le64toh(l);
 551
 552                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
 553                             e[1+sizeof(uint64_t)+l] != '\n') {
 554                                 log_debug("Failed to parse message, ignoring.");
 555                                 break;
 556                         }
 557
 558                         k = malloc((e - p) + 1 + l);
 559                         if (!k) {
 560                                 log_error("Out of memory");
 561                                 break;
 562                         }
 563
 564                         memcpy(k, p, e - p);
 565                         k[e - p] = '=';
 566                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
 567
 568                         if (valid_user_field(p, e - p)) {
 569                                 iovec[n].iov_base = k;
 570                                 iovec[n].iov_len = (e - p) + 1 + l;
 571                                 n++;
 572                         } else
 573                                 free(k);
 574
 575                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
 576                         p = e + 1 + sizeof(uint64_t) + l + 1;
 577                 }
 578         }
 579
 580         dispatch_message(s, iovec, n, m, ucred, tv);
 581
 582         for (j = 0; j < n; j++)
 583                 if (iovec[j].iov_base < buffer ||
 584                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
 585                         free(iovec[j].iov_base);
 586 }
 587
 588 static int stdout_stream_log(StdoutStream *s, const char *p, size_t l) {
 589         struct iovec iovec[15];
 590         char *message = NULL, *syslog_priority = NULL;
 591         unsigned n = 0;
 592         size_t tag_len;
 593         int priority;
 594
 595         assert(s);
 596         assert(p);
 597
 598         priority = s->priority;
 599
 600         if (s->priority_prefix &&
 601             l > 3 &&
 602             p[0] == '<' &&
 603             p[1] >= '0' && p[1] <= '7' &&
 604             p[2] == '>') {
 605
 606                 priority = p[1] - '0';
 607                 p += 3;
 608                 l -= 3;
 609         }
 610
 611         if (l <= 0)
 612                 return 0;
 613
 614         if (asprintf(&syslog_priority, "PRIORITY=%i", priority) >= 0)
 615                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 616
 617         tag_len = s->tag ? strlen(s->tag) + 2: 0;
 618         message = malloc(8 + tag_len + l);
 619         if (message) {
 620                 memcpy(message, "MESSAGE=", 8);
 621
 622                 if (s->tag) {
 623                         memcpy(message+8, s->tag, tag_len-2);
 624                         memcpy(message+8+tag_len-2, ": ", 2);
 625                 }
 626
 627                 memcpy(message+8+tag_len, p, l);
 628                 iovec[n].iov_base = message;
 629                 iovec[n].iov_len = 8+tag_len+l;
 630                 n++;
 631         }
 632
 633         dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL);
 634
 635         if (s->tee_console) {
 636                 int console;
 637
 638                 console = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 639                 if (console >= 0) {
 640                         n = 0;
 641                         if (s->tag) {
 642                                 IOVEC_SET_STRING(iovec[n++], s->tag);
 643                                 IOVEC_SET_STRING(iovec[n++], ": ");
 644                         }
 645
 646                         iovec[n].iov_base = (void*) p;
 647                         iovec[n].iov_len = l;
 648                         n++;
 649
 650                         IOVEC_SET_STRING(iovec[n++], (char*) "\n");
 651
 652                         writev(console, iovec, n);
 653                 }
 654         }
 655
 656         free(message);
 657         free(syslog_priority);
 658
 659         return 0;
 660 }
 661
 662 static int stdout_stream_line(StdoutStream *s, const char *p, size_t l) {
 663         assert(s);
 664         assert(p);
 665
 666         while (l > 0 && strchr(WHITESPACE, *p)) {
 667                 l--;
 668                 p++;
 669         }
 670
 671         while (l > 0 && strchr(WHITESPACE, *(p+l-1)))
 672                 l--;
 673
 674         switch (s->state) {
 675
 676         case STDOUT_STREAM_TAG:
 677
 678                 if (l > 0) {
 679                         s->tag = strndup(p, l);
 680                         if (!s->tag) {
 681                                 log_error("Out of memory");
 682                                 return -EINVAL;
 683                         }
 684                 }
 685
 686                 s->state = STDOUT_STREAM_PRIORITY;
 687                 return 0;
 688
 689         case STDOUT_STREAM_PRIORITY:
 690                 if (l != 1 || *p < '0' || *p > '7') {
 691                         log_warning("Failed to parse log priority line.");
 692                         return -EINVAL;
 693                 }
 694
 695                 s->priority = *p - '0';
 696                 s->state = STDOUT_STREAM_PRIORITY_PREFIX;
 697                 return 0;
 698
 699         case STDOUT_STREAM_PRIORITY_PREFIX:
 700                 if (l != 1 || *p < '0' || *p > '1') {
 701                         log_warning("Failed to parse priority prefix line.");
 702                         return -EINVAL;
 703                 }
 704
 705                 s->priority_prefix = *p - '0';
 706                 s->state = STDOUT_STREAM_TEE_CONSOLE;
 707                 return 0;
 708
 709         case STDOUT_STREAM_TEE_CONSOLE:
 710                 if (l != 1 || *p < '0' || *p > '1') {
 711                         log_warning("Failed to parse tee to console line.");
 712                         return -EINVAL;
 713                 }
 714
 715                 s->tee_console = *p - '0';
 716                 s->state = STDOUT_STREAM_RUNNING;
 717                 return 0;
 718
 719         case STDOUT_STREAM_RUNNING:
 720                 return stdout_stream_log(s, p, l);
 721         }
 722
 723         assert_not_reached("Unknown stream state");
 724 }
 725
 726 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 727         char *p;
 728         size_t remaining;
 729         int r;
 730
 731         assert(s);
 732
 733         p = s->buffer;
 734         remaining = s->length;
 735         for (;;) {
 736                 char *end;
 737                 size_t skip;
 738
 739                 end = memchr(p, '\n', remaining);
 740                 if (!end) {
 741                         if (remaining >= LINE_MAX) {
 742                                 end = p + LINE_MAX;
 743                                 skip = LINE_MAX;
 744                         } else
 745                                 break;
 746                 } else
 747                         skip = end - p + 1;
 748
 749                 r = stdout_stream_line(s, p, end - p);
 750                 if (r < 0)
 751                         return r;
 752
 753                 remaining -= skip;
 754                 p += skip;
 755         }
 756
 757         if (force_flush && remaining > 0) {
 758                 r = stdout_stream_line(s, p, remaining);
 759                 if (r < 0)
 760                         return r;
 761
 762                 p += remaining;
 763                 remaining = 0;
 764         }
 765
 766         if (p > s->buffer) {
 767                 memmove(s->buffer, p, remaining);
 768                 s->length = remaining;
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int stdout_stream_process(StdoutStream *s) {
 775         ssize_t l;
 776         int r;
 777
 778         assert(s);
 779
 780         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
 781         if (l < 0) {
 782
 783                 if (errno == EAGAIN)
 784                         return 0;
 785
 786                 log_warning("Failed to read from stream: %m");
 787                 return -errno;
 788         }
 789
 790         if (l == 0) {
 791                 r = stdout_stream_scan(s, true);
 792                 if (r < 0)
 793                         return r;
 794
 795                 return 0;
 796         }
 797
 798         s->length += l;
 799         r = stdout_stream_scan(s, false);
 800         if (r < 0)
 801                 return r;
 802
 803         return 1;
 804
 805 }
 806
 807 static void stdout_stream_free(StdoutStream *s) {
 808         assert(s);
 809
 810         if (s->server) {
 811                 assert(s->server->n_stdout_streams > 0);
 812                 s->server->n_stdout_streams --;
 813                 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
 814         }
 815
 816         if (s->fd >= 0) {
 817                 if (s->server)
 818                         epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
 819
 820                 close_nointr_nofail(s->fd);
 821         }
 822
 823         free(s->tag);
 824         free(s);
 825 }
 826
 827 static int stdout_stream_new(Server *s) {
 828         StdoutStream *stream;
 829         int fd, r;
 830         socklen_t len;
 831         struct epoll_event ev;
 832
 833         assert(s);
 834
 835         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
 836         if (fd < 0) {
 837                 if (errno == EAGAIN)
 838                         return 0;
 839
 840                 log_error("Failed to accept stdout connection: %m");
 841                 return -errno;
 842         }
 843
 844         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 845                 log_warning("Too many stdout streams, refusing connection.");
 846                 close_nointr_nofail(fd);
 847                 return 0;
 848         }
 849
 850         stream = new0(StdoutStream, 1);
 851         if (!stream) {
 852                 log_error("Out of memory.");
 853                 close_nointr_nofail(fd);
 854                 return -ENOMEM;
 855         }
 856
 857         stream->fd = fd;
 858
 859         len = sizeof(stream->ucred);
 860         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
 861                 log_error("Failed to determine peer credentials: %m");
 862                 r = -errno;
 863                 goto fail;
 864         }
 865
 866         if (shutdown(fd, SHUT_WR) < 0) {
 867                 log_error("Failed to shutdown writing side of socket: %m");
 868                 r = -errno;
 869                 goto fail;
 870         }
 871
 872         zero(ev);
 873         ev.data.ptr = stream;
 874         ev.events = EPOLLIN;
 875         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
 876                 log_error("Failed to add stream to event loop: %m");
 877                 r = -errno;
 878                 goto fail;
 879         }
 880
 881         stream->server = s;
 882         LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
 883         s->n_stdout_streams ++;
 884
 885         return 0;
 886
 887 fail:
 888         stdout_stream_free(stream);
 889         return r;
 890 }
 891
 892 static int process_event(Server *s, struct epoll_event *ev) {
 893         assert(s);
 894
 895         if (ev->data.fd == s->signal_fd) {
 896                 struct signalfd_siginfo sfsi;
 897                 ssize_t n;
 898
 899                 if (ev->events != EPOLLIN) {
 900                         log_info("Got invalid event from epoll.");
 901                         return -EIO;
 902                 }
 903
 904                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
 905                 if (n != sizeof(sfsi)) {
 906
 907                         if (n >= 0)
 908                                 return -EIO;
 909
 910                         if (errno == EINTR || errno == EAGAIN)
 911                                 return 0;
 912
 913                         return -errno;
 914                 }
 915
 916                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
 917                 return 0;
 918
 919         } else if (ev->data.fd == s->native_fd ||
 920                    ev->data.fd == s->syslog_fd) {
 921
 922                 if (ev->events != EPOLLIN) {
 923                         log_info("Got invalid event from epoll.");
 924                         return -EIO;
 925                 }
 926
 927                 for (;;) {
 928                         struct msghdr msghdr;
 929                         struct iovec iovec;
 930                         struct ucred *ucred = NULL;
 931                         struct timeval *tv = NULL;
 932                         struct cmsghdr *cmsg;
 933                         union {
 934                                 struct cmsghdr cmsghdr;
 935                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
 936                                             CMSG_SPACE(sizeof(struct timeval))];
 937                         } control;
 938                         ssize_t n;
 939                         int v;
 940
 941                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
 942                                 log_error("SIOCINQ failed: %m");
 943                                 return -errno;
 944                         }
 945
 946                         if (v <= 0)
 947                                 return 1;
 948
 949                         if (s->buffer_size < (size_t) v) {
 950                                 void *b;
 951                                 size_t l;
 952
 953                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
 954                                 b = realloc(s->buffer, l+1);
 955
 956                                 if (!b) {
 957                                         log_error("Couldn't increase buffer.");
 958                                         return -ENOMEM;
 959                                 }
 960
 961                                 s->buffer_size = l;
 962                                 s->buffer = b;
 963                         }
 964
 965                         zero(iovec);
 966                         iovec.iov_base = s->buffer;
 967                         iovec.iov_len = s->buffer_size;
 968
 969                         zero(control);
 970                         zero(msghdr);
 971                         msghdr.msg_iov = &iovec;
 972                         msghdr.msg_iovlen = 1;
 973                         msghdr.msg_control = &control;
 974                         msghdr.msg_controllen = sizeof(control);
 975
 976                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
 977                         if (n < 0) {
 978
 979                                 if (errno == EINTR || errno == EAGAIN)
 980                                         return 1;
 981
 982                                 log_error("recvmsg() failed: %m");
 983                                 return -errno;
 984                         }
 985
 986                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
 987
 988                                 if (cmsg->cmsg_level == SOL_SOCKET &&
 989                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
 990                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
 991                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
 992                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
 993                                          cmsg->cmsg_type == SO_TIMESTAMP &&
 994                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
 995                                         tv = (struct timeval*) CMSG_DATA(cmsg);
 996                         }
 997
 998                         if (ev->data.fd == s->syslog_fd) {
 999                                 char *e;
1000
1001                                 e = memchr(s->buffer, '\n', n);
1002                                 if (e)
1003                                         *e = 0;
1004                                 else
1005                                         s->buffer[n] = 0;
1006
1007                                 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
1008                         } else
1009                                 process_native_message(s, s->buffer, n, ucred, tv);
1010                 }
1011
1012                 return 1;
1013
1014         } else if (ev->data.fd == s->stdout_fd) {
1015
1016                 if (ev->events != EPOLLIN) {
1017                         log_info("Got invalid event from epoll.");
1018                         return -EIO;
1019                 }
1020
1021                 stdout_stream_new(s);
1022                 return 1;
1023
1024         } else {
1025                 StdoutStream *stream;
1026
1027                 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
1028                         log_info("Got invalid event from epoll.");
1029                         return -EIO;
1030                 }
1031
1032                 /* If it is none of the well-known fds, it must be an
1033                  * stdout stream fd. Note that this is a bit ugly here
1034                  * (since we rely that none of the well-known fds
1035                  * could be interpreted as pointer), but nonetheless
1036                  * safe, since the well-known fds would never get an
1037                  * fd > 4096, i.e. beyond the first memory page */
1038
1039                 stream = ev->data.ptr;
1040
1041                 if (stdout_stream_process(stream) <= 0)
1042                         stdout_stream_free(stream);
1043
1044                 return 1;
1045         }
1046
1047         log_error("Unknown event.");
1048         return 0;
1049 }
1050
1051 static int system_journal_open(Server *s) {
1052         int r;
1053         char *fn;
1054         sd_id128_t machine;
1055         char ids[33];
1056
1057         r = sd_id128_get_machine(&machine);
1058         if (r < 0)
1059                 return r;
1060
1061         /* First try to create the machine path, but not the prefix */
1062         fn = strappend("/var/log/journal/", sd_id128_to_string(machine, ids));
1063         if (!fn)
1064                 return -ENOMEM;
1065         (void) mkdir(fn, 0755);
1066         free(fn);
1067
1068         /* The create the system journal file */
1069         fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1070         if (!fn)
1071                 return -ENOMEM;
1072
1073         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1074         free(fn);
1075
1076         if (r >= 0) {
1077                 s->system_journal->metrics = s->metrics;
1078                 s->system_journal->compress = s->compress;
1079
1080                 fix_perms(s->system_journal, 0);
1081                 return r;
1082         }
1083
1084         if (r < 0 && r != -ENOENT) {
1085                 log_error("Failed to open system journal: %s", strerror(-r));
1086                 return r;
1087         }
1088
1089         /* /var didn't work, so try /run, but this time we
1090          * create the prefix too */
1091         fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1092         if (!fn)
1093                 return -ENOMEM;
1094
1095         (void) mkdir_parents(fn, 0755);
1096         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1097         free(fn);
1098
1099         if (r < 0) {
1100                 log_error("Failed to open runtime journal: %s", strerror(-r));
1101                 return r;
1102         }
1103
1104         s->runtime_journal->metrics = s->metrics;
1105         s->runtime_journal->compress = s->compress;
1106
1107         fix_perms(s->runtime_journal, 0);
1108         return r;
1109 }
1110
1111 static int open_syslog_socket(Server *s) {
1112         union sockaddr_union sa;
1113         int one, r;
1114         struct epoll_event ev;
1115
1116         assert(s);
1117
1118         if (s->syslog_fd < 0) {
1119
1120                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1121                 if (s->syslog_fd < 0) {
1122                         log_error("socket() failed: %m");
1123                         return -errno;
1124                 }
1125
1126                 zero(sa);
1127                 sa.un.sun_family = AF_UNIX;
1128                 strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));
1129
1130                 unlink(sa.un.sun_path);
1131
1132                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1133                 if (r < 0) {
1134                         log_error("bind() failed: %m");
1135                         return -errno;
1136                 }
1137
1138                 chmod(sa.un.sun_path, 0666);
1139         }
1140
1141         one = 1;
1142         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1143         if (r < 0) {
1144                 log_error("SO_PASSCRED failed: %m");
1145                 return -errno;
1146         }
1147
1148         one = 1;
1149         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1150         if (r < 0) {
1151                 log_error("SO_TIMESTAMP failed: %m");
1152                 return -errno;
1153         }
1154
1155         zero(ev);
1156         ev.events = EPOLLIN;
1157         ev.data.fd = s->syslog_fd;
1158         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
1159                 log_error("Failed to add syslog server fd to epoll object: %m");
1160                 return -errno;
1161         }
1162
1163         return 0;
1164 }
1165
1166 static int open_native_socket(Server*s) {
1167         union sockaddr_union sa;
1168         int one, r;
1169         struct epoll_event ev;
1170
1171         assert(s);
1172
1173         if (s->native_fd < 0) {
1174
1175                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1176                 if (s->native_fd < 0) {
1177                         log_error("socket() failed: %m");
1178                         return -errno;
1179                 }
1180
1181                 zero(sa);
1182                 sa.un.sun_family = AF_UNIX;
1183                 strncpy(sa.un.sun_path, "/run/systemd/journal", sizeof(sa.un.sun_path));
1184
1185                 unlink(sa.un.sun_path);
1186
1187                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1188                 if (r < 0) {
1189                         log_error("bind() failed: %m");
1190                         return -errno;
1191                 }
1192
1193                 chmod(sa.un.sun_path, 0666);
1194         }
1195
1196         one = 1;
1197         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1198         if (r < 0) {
1199                 log_error("SO_PASSCRED failed: %m");
1200                 return -errno;
1201         }
1202
1203         one = 1;
1204         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1205         if (r < 0) {
1206                 log_error("SO_TIMESTAMP failed: %m");
1207                 return -errno;
1208         }
1209
1210         zero(ev);
1211         ev.events = EPOLLIN;
1212         ev.data.fd = s->native_fd;
1213         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
1214                 log_error("Failed to add native server fd to epoll object: %m");
1215                 return -errno;
1216         }
1217
1218         return 0;
1219 }
1220
1221 static int open_stdout_socket(Server *s) {
1222         union sockaddr_union sa;
1223         int r;
1224         struct epoll_event ev;
1225
1226         assert(s);
1227
1228         if (s->stdout_fd < 0) {
1229
1230                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
1231                 if (s->stdout_fd < 0) {
1232                         log_error("socket() failed: %m");
1233                         return -errno;
1234                 }
1235
1236                 zero(sa);
1237                 sa.un.sun_family = AF_UNIX;
1238                 strncpy(sa.un.sun_path, "/run/systemd/stdout", sizeof(sa.un.sun_path));
1239
1240                 unlink(sa.un.sun_path);
1241
1242                 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1243                 if (r < 0) {
1244                         log_error("bind() failed: %m");
1245                         return -errno;
1246                 }
1247
1248                 chmod(sa.un.sun_path, 0666);
1249
1250                 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
1251                         log_error("liste() failed: %m");
1252                         return -errno;
1253                 }
1254         }
1255
1256         zero(ev);
1257         ev.events = EPOLLIN;
1258         ev.data.fd = s->stdout_fd;
1259         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
1260                 log_error("Failed to add stdout server fd to epoll object: %m");
1261                 return -errno;
1262         }
1263
1264         return 0;
1265 }
1266
1267 static int open_signalfd(Server *s) {
1268         sigset_t mask;
1269         struct epoll_event ev;
1270
1271         assert(s);
1272
1273         assert_se(sigemptyset(&mask) == 0);
1274         sigset_add_many(&mask, SIGINT, SIGTERM, -1);
1275         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
1276
1277         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1278         if (s->signal_fd < 0) {
1279                 log_error("signalfd(): %m");
1280                 return -errno;
1281         }
1282
1283         zero(ev);
1284         ev.events = EPOLLIN;
1285         ev.data.fd = s->signal_fd;
1286
1287         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
1288                 log_error("epoll_ctl(): %m");
1289                 return -errno;
1290         }
1291
1292         return 0;
1293 }
1294
1295 static int server_init(Server *s) {
1296         int n, r, fd;
1297
1298         assert(s);
1299
1300         zero(*s);
1301         s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = -1;
1302         s->metrics.max_size = DEFAULT_MAX_SIZE;
1303         s->metrics.min_size = DEFAULT_MIN_SIZE;
1304         s->metrics.keep_free = DEFAULT_KEEP_FREE;
1305         s->max_use = DEFAULT_MAX_USE;
1306         s->compress = true;
1307
1308         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
1309         if (!s->user_journals) {
1310                 log_error("Out of memory.");
1311                 return -ENOMEM;
1312         }
1313
1314         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1315         if (s->epoll_fd < 0) {
1316                 log_error("Failed to create epoll object: %m");
1317                 return -errno;
1318         }
1319
1320         n = sd_listen_fds(true);
1321         if (n < 0) {
1322                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
1323                 return n;
1324         }
1325
1326         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
1327
1328                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/native", 0) > 0) {
1329
1330                         if (s->native_fd >= 0) {
1331                                 log_error("Too many native sockets passed.");
1332                                 return -EINVAL;
1333                         }
1334
1335                         s->native_fd = fd;
1336
1337                 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/stdout", 0) > 0) {
1338
1339                         if (s->stdout_fd >= 0) {
1340                                 log_error("Too many stdout sockets passed.");
1341                                 return -EINVAL;
1342                         }
1343
1344                         s->stdout_fd = fd;
1345
1346                 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
1347
1348                         if (s->syslog_fd >= 0) {
1349                                 log_error("Too many /dev/log sockets passed.");
1350                                 return -EINVAL;
1351                         }
1352
1353                         s->syslog_fd = fd;
1354
1355                 } else {
1356                         log_error("Unknown socket passed.");
1357                         return -EINVAL;
1358                 }
1359         }
1360
1361         r = open_syslog_socket(s);
1362         if (r < 0)
1363                 return r;
1364
1365         r = open_native_socket(s);
1366         if (r < 0)
1367                 return r;
1368
1369         r = open_stdout_socket(s);
1370         if (r < 0)
1371                 return r;
1372
1373         r = system_journal_open(s);
1374         if (r < 0)
1375                 return r;
1376
1377         r = open_signalfd(s);
1378         if (r < 0)
1379                 return r;
1380
1381         return 0;
1382 }
1383
1384 static void server_done(Server *s) {
1385         JournalFile *f;
1386         assert(s);
1387
1388         while (s->stdout_streams)
1389                 stdout_stream_free(s->stdout_streams);
1390
1391         if (s->system_journal)
1392                 journal_file_close(s->system_journal);
1393
1394         if (s->runtime_journal)
1395                 journal_file_close(s->runtime_journal);
1396
1397         while ((f = hashmap_steal_first(s->user_journals)))
1398                 journal_file_close(f);
1399
1400         hashmap_free(s->user_journals);
1401
1402         if (s->epoll_fd >= 0)
1403                 close_nointr_nofail(s->epoll_fd);
1404
1405         if (s->signal_fd >= 0)
1406                 close_nointr_nofail(s->signal_fd);
1407
1408         if (s->syslog_fd >= 0)
1409                 close_nointr_nofail(s->syslog_fd);
1410
1411         if (s->native_fd >= 0)
1412                 close_nointr_nofail(s->native_fd);
1413
1414         if (s->stdout_fd >= 0)
1415                 close_nointr_nofail(s->stdout_fd);
1416 }
1417
1418 int main(int argc, char *argv[]) {
1419         Server server;
1420         int r;
1421
1422         /* if (getppid() != 1) { */
1423         /*         log_error("This program should be invoked by init only."); */
1424         /*         return EXIT_FAILURE; */
1425         /* } */
1426
1427         if (argc > 1) {
1428                 log_error("This program does not take arguments.");
1429                 return EXIT_FAILURE;
1430         }
1431
1432         log_set_target(LOG_TARGET_CONSOLE);
1433         log_set_max_level(LOG_DEBUG);
1434         log_parse_environment();
1435         log_open();
1436
1437         umask(0022);
1438
1439         r = server_init(&server);
1440         if (r < 0)
1441                 goto finish;
1442
1443         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
1444
1445         sd_notify(false,
1446                   "READY=1\n"
1447                   "STATUS=Processing requests...");
1448
1449         for (;;) {
1450                 struct epoll_event event;
1451
1452                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
1453                 if (r < 0) {
1454
1455                         if (errno == EINTR)
1456                                 continue;
1457
1458                         log_error("epoll_wait() failed: %m");
1459                         r = -errno;
1460                         goto finish;
1461                 } else if (r == 0)
1462                         break;
1463
1464                 r = process_event(&server, &event);
1465                 if (r < 0)
1466                         goto finish;
1467                 else if (r == 0)
1468                         break;
1469         }
1470
1471         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
1472
1473 finish:
1474         sd_notify(false,
1475                   "STATUS=Shutting down...");
1476
1477         server_done(&server);
1478
1479         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1480 }