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 #include <sys/statvfs.h>
  34
  35 #include <systemd/sd-journal.h>
  36 #include <systemd/sd-login.h>
  37 #include <systemd/sd-messages.h>
  38 #include <systemd/sd-daemon.h>
  39
  40 #include "hashmap.h"
  41 #include "journal-file.h"
  42 #include "socket-util.h"
  43 #include "acl-util.h"
  44 #include "cgroup-util.h"
  45 #include "list.h"
  46 #include "journal-rate-limit.h"
  47 #include "journal-internal.h"
  48 #include "conf-parser.h"
  49 #include "journald.h"
  50 #include "virt.h"
  51
  52 #define USER_JOURNALS_MAX 1024
  53 #define STDOUT_STREAMS_MAX 4096
  54
  55 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
  56 #define DEFAULT_RATE_LIMIT_BURST 200
  57
  58 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
  59
  60 #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)
  61
  62 #define SYSLOG_TIMEOUT_USEC (250*USEC_PER_MSEC)
  63
  64 #define N_IOVEC_META_FIELDS 16
  65
  66 typedef enum StdoutStreamState {
  67         STDOUT_STREAM_IDENTIFIER,
  68         STDOUT_STREAM_PRIORITY,
  69         STDOUT_STREAM_LEVEL_PREFIX,
  70         STDOUT_STREAM_FORWARD_TO_SYSLOG,
  71         STDOUT_STREAM_FORWARD_TO_KMSG,
  72         STDOUT_STREAM_FORWARD_TO_CONSOLE,
  73         STDOUT_STREAM_RUNNING
  74 } StdoutStreamState;
  75
  76 struct StdoutStream {
  77         Server *server;
  78         StdoutStreamState state;
  79
  80         int fd;
  81
  82         struct ucred ucred;
  83
  84         char *identifier;
  85         int priority;
  86         bool level_prefix:1;
  87         bool forward_to_syslog:1;
  88         bool forward_to_kmsg:1;
  89         bool forward_to_console:1;
  90
  91         char buffer[LINE_MAX+1];
  92         size_t length;
  93
  94         LIST_FIELDS(StdoutStream, stdout_stream);
  95 };
  96
  97 static int server_flush_to_var(Server *s);
  98
  99 static uint64_t available_space(Server *s) {
 100         char ids[33], *p;
 101         const char *f;
 102         sd_id128_t machine;
 103         struct statvfs ss;
 104         uint64_t sum = 0, avail = 0, ss_avail = 0;
 105         int r;
 106         DIR *d;
 107         usec_t ts;
 108         JournalMetrics *m;
 109
 110         ts = now(CLOCK_MONOTONIC);
 111
 112         if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
 113                 return s->cached_available_space;
 114
 115         r = sd_id128_get_machine(&machine);
 116         if (r < 0)
 117                 return 0;
 118
 119         if (s->system_journal) {
 120                 f = "/var/log/journal/";
 121                 m = &s->system_metrics;
 122         } else {
 123                 f = "/run/log/journal/";
 124                 m = &s->runtime_metrics;
 125         }
 126
 127         assert(m);
 128
 129         p = strappend(f, sd_id128_to_string(machine, ids));
 130         if (!p)
 131                 return 0;
 132
 133         d = opendir(p);
 134         free(p);
 135
 136         if (!d)
 137                 return 0;
 138
 139         if (fstatvfs(dirfd(d), &ss) < 0)
 140                 goto finish;
 141
 142         for (;;) {
 143                 struct stat st;
 144                 struct dirent buf, *de;
 145                 int k;
 146
 147                 k = readdir_r(d, &buf, &de);
 148                 if (k != 0) {
 149                         r = -k;
 150                         goto finish;
 151                 }
 152
 153                 if (!de)
 154                         break;
 155
 156                 if (!dirent_is_file_with_suffix(de, ".journal"))
 157                         continue;
 158
 159                 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
 160                         continue;
 161
 162                 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
 163         }
 164
 165         avail = sum >= m->max_use ? 0 : m->max_use - sum;
 166
 167         ss_avail = ss.f_bsize * ss.f_bavail;
 168
 169         ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
 170
 171         if (ss_avail < avail)
 172                 avail = ss_avail;
 173
 174         s->cached_available_space = avail;
 175         s->cached_available_space_timestamp = ts;
 176
 177 finish:
 178         closedir(d);
 179
 180         return avail;
 181 }
 182
 183 static void fix_perms(JournalFile *f, uid_t uid) {
 184         acl_t acl;
 185         acl_entry_t entry;
 186         acl_permset_t permset;
 187         int r;
 188
 189         assert(f);
 190
 191         r = fchmod_and_fchown(f->fd, 0640, 0, 0);
 192         if (r < 0)
 193                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
 194
 195         if (uid <= 0)
 196                 return;
 197
 198         acl = acl_get_fd(f->fd);
 199         if (!acl) {
 200                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
 201                 return;
 202         }
 203
 204         r = acl_find_uid(acl, uid, &entry);
 205         if (r <= 0) {
 206
 207                 if (acl_create_entry(&acl, &entry) < 0 ||
 208                     acl_set_tag_type(entry, ACL_USER) < 0 ||
 209                     acl_set_qualifier(entry, &uid) < 0) {
 210                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 211                         goto finish;
 212                 }
 213         }
 214
 215         if (acl_get_permset(entry, &permset) < 0 ||
 216             acl_add_perm(permset, ACL_READ) < 0 ||
 217             acl_calc_mask(&acl) < 0) {
 218                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 219                 goto finish;
 220         }
 221
 222         if (acl_set_fd(f->fd, acl) < 0)
 223                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
 224
 225 finish:
 226         acl_free(acl);
 227 }
 228
 229 static JournalFile* find_journal(Server *s, uid_t uid) {
 230         char *p;
 231         int r;
 232         JournalFile *f;
 233         char ids[33];
 234         sd_id128_t machine;
 235
 236         assert(s);
 237
 238         /* We split up user logs only on /var, not on /run. If the
 239          * runtime file is open, we write to it exclusively, in order
 240          * to guarantee proper order as soon as we flush /run to
 241          * /var and close the runtime file. */
 242
 243         if (s->runtime_journal)
 244                 return s->runtime_journal;
 245
 246         if (uid <= 0)
 247                 return s->system_journal;
 248
 249         r = sd_id128_get_machine(&machine);
 250         if (r < 0)
 251                 return s->system_journal;
 252
 253         f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
 254         if (f)
 255                 return f;
 256
 257         if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
 258                 return s->system_journal;
 259
 260         while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
 261                 /* Too many open? Then let's close one */
 262                 f = hashmap_steal_first(s->user_journals);
 263                 assert(f);
 264                 journal_file_close(f);
 265         }
 266
 267         r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
 268         free(p);
 269
 270         if (r < 0)
 271                 return s->system_journal;
 272
 273         fix_perms(f, uid);
 274         f->metrics = s->system_metrics;
 275         f->compress = s->compress;
 276
 277         r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
 278         if (r < 0) {
 279                 journal_file_close(f);
 280                 return s->system_journal;
 281         }
 282
 283         return f;
 284 }
 285
 286 static void server_rotate(Server *s) {
 287         JournalFile *f;
 288         void *k;
 289         Iterator i;
 290         int r;
 291
 292         log_info("Rotating...");
 293
 294         if (s->runtime_journal) {
 295                 r = journal_file_rotate(&s->runtime_journal);
 296                 if (r < 0)
 297                         log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
 298         }
 299
 300         if (s->system_journal) {
 301                 r = journal_file_rotate(&s->system_journal);
 302                 if (r < 0)
 303                         log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
 304         }
 305
 306         HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
 307                 r = journal_file_rotate(&f);
 308                 if (r < 0)
 309                         log_error("Failed to rotate %s: %s", f->path, strerror(-r));
 310                 else
 311                         hashmap_replace(s->user_journals, k, f);
 312         }
 313 }
 314
 315 static void server_vacuum(Server *s) {
 316         char *p;
 317         char ids[33];
 318         sd_id128_t machine;
 319         int r;
 320
 321         log_info("Vacuuming...");
 322
 323         r = sd_id128_get_machine(&machine);
 324         if (r < 0) {
 325                 log_error("Failed to get machine ID: %s", strerror(-r));
 326                 return;
 327         }
 328
 329         sd_id128_to_string(machine, ids);
 330
 331         if (s->system_journal) {
 332                 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
 333                         log_error("Out of memory.");
 334                         return;
 335                 }
 336
 337                 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
 338                 if (r < 0 && r != -ENOENT)
 339                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
 340                 free(p);
 341         }
 342
 343
 344         if (s->runtime_journal) {
 345                 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
 346                         log_error("Out of memory.");
 347                         return;
 348                 }
 349
 350                 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
 351                 if (r < 0 && r != -ENOENT)
 352                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
 353                 free(p);
 354         }
 355
 356         s->cached_available_space_timestamp = 0;
 357 }
 358
 359 static char *shortened_cgroup_path(pid_t pid) {
 360         int r;
 361         char *process_path, *init_path, *path;
 362
 363         assert(pid > 0);
 364
 365         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
 366         if (r < 0)
 367                 return NULL;
 368
 369         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
 370         if (r < 0) {
 371                 free(process_path);
 372                 return NULL;
 373         }
 374
 375         if (endswith(init_path, "/system"))
 376                 init_path[strlen(init_path) - 7] = 0;
 377         else if (streq(init_path, "/"))
 378                 init_path[0] = 0;
 379
 380         if (startswith(process_path, init_path)) {
 381                 char *p;
 382
 383                 p = strdup(process_path + strlen(init_path));
 384                 if (!p) {
 385                         free(process_path);
 386                         free(init_path);
 387                         return NULL;
 388                 }
 389                 path = p;
 390         } else {
 391                 path = process_path;
 392                 process_path = NULL;
 393         }
 394
 395         free(process_path);
 396         free(init_path);
 397
 398         return path;
 399 }
 400
 401 static void dispatch_message_real(Server *s,
 402                              struct iovec *iovec, unsigned n, unsigned m,
 403                              struct ucred *ucred,
 404                              struct timeval *tv) {
 405
 406         char *pid = NULL, *uid = NULL, *gid = NULL,
 407                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 408                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 409                 *audit_session = NULL, *audit_loginuid = NULL,
 410                 *exe = NULL, *cgroup = NULL, *session = NULL,
 411                 *owner_uid = NULL, *unit = NULL;
 412
 413         char idbuf[33];
 414         sd_id128_t id;
 415         int r;
 416         char *t;
 417         uid_t loginuid = 0, realuid = 0;
 418         JournalFile *f;
 419         bool vacuumed = false;
 420
 421         assert(s);
 422         assert(iovec);
 423         assert(n > 0);
 424         assert(n + N_IOVEC_META_FIELDS <= m);
 425
 426         if (ucred) {
 427                 uint32_t audit;
 428                 uid_t owner;
 429
 430                 realuid = ucred->uid;
 431
 432                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 433                         IOVEC_SET_STRING(iovec[n++], pid);
 434
 435                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 436                         IOVEC_SET_STRING(iovec[n++], uid);
 437
 438                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 439                         IOVEC_SET_STRING(iovec[n++], gid);
 440
 441                 r = get_process_comm(ucred->pid, &t);
 442                 if (r >= 0) {
 443                         comm = strappend("_COMM=", t);
 444                         free(t);
 445
 446                         if (comm)
 447                                 IOVEC_SET_STRING(iovec[n++], comm);
 448                 }
 449
 450                 r = get_process_exe(ucred->pid, &t);
 451                 if (r >= 0) {
 452                         exe = strappend("_EXE=", t);
 453                         free(t);
 454
 455                         if (comm)
 456                                 IOVEC_SET_STRING(iovec[n++], exe);
 457                 }
 458
 459                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 460                 if (r >= 0) {
 461                         cmdline = strappend("_CMDLINE=", t);
 462                         free(t);
 463
 464                         if (cmdline)
 465                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 466                 }
 467
 468                 r = audit_session_from_pid(ucred->pid, &audit);
 469                 if (r >= 0)
 470                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
 471                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 472
 473                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 474                 if (r >= 0)
 475                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 476                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 477
 478                 t = shortened_cgroup_path(ucred->pid);
 479                 if (t) {
 480                         cgroup = strappend("_SYSTEMD_CGROUP=", t);
 481                         free(t);
 482
 483                         if (cgroup)
 484                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 485                 }
 486
 487                 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
 488                         session = strappend("_SYSTEMD_SESSION=", t);
 489                         free(t);
 490
 491                         if (session)
 492                                 IOVEC_SET_STRING(iovec[n++], session);
 493                 }
 494
 495                 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
 496                         unit = strappend("_SYSTEMD_UNIT=", t);
 497                         free(t);
 498
 499                         if (unit)
 500                                 IOVEC_SET_STRING(iovec[n++], unit);
 501                 }
 502
 503                 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
 504                         if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
 505                                 IOVEC_SET_STRING(iovec[n++], owner_uid);
 506         }
 507
 508         if (tv) {
 509                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 510                              (unsigned long long) timeval_load(tv)) >= 0)
 511                         IOVEC_SET_STRING(iovec[n++], source_time);
 512         }
 513
 514         /* Note that strictly speaking storing the boot id here is
 515          * redundant since the entry includes this in-line
 516          * anyway. However, we need this indexed, too. */
 517         r = sd_id128_get_boot(&id);
 518         if (r >= 0)
 519                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 520                         IOVEC_SET_STRING(iovec[n++], boot_id);
 521
 522         r = sd_id128_get_machine(&id);
 523         if (r >= 0)
 524                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 525                         IOVEC_SET_STRING(iovec[n++], machine_id);
 526
 527         t = gethostname_malloc();
 528         if (t) {
 529                 hostname = strappend("_HOSTNAME=", t);
 530                 free(t);
 531                 if (hostname)
 532                         IOVEC_SET_STRING(iovec[n++], hostname);
 533         }
 534
 535         assert(n <= m);
 536
 537         server_flush_to_var(s);
 538
 539 retry:
 540         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 541         if (!f)
 542                 log_warning("Dropping message, as we can't find a place to store the data.");
 543         else {
 544                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 545
 546                 if (r == -E2BIG && !vacuumed) {
 547                         log_info("Allocation limit reached.");
 548
 549                         server_rotate(s);
 550                         server_vacuum(s);
 551                         vacuumed = true;
 552
 553                         log_info("Retrying write.");
 554                         goto retry;
 555                 }
 556
 557                 if (r < 0)
 558                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 559         }
 560
 561         free(pid);
 562         free(uid);
 563         free(gid);
 564         free(comm);
 565         free(exe);
 566         free(cmdline);
 567         free(source_time);
 568         free(boot_id);
 569         free(machine_id);
 570         free(hostname);
 571         free(audit_session);
 572         free(audit_loginuid);
 573         free(cgroup);
 574         free(session);
 575         free(owner_uid);
 576         free(unit);
 577 }
 578
 579 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
 580         char mid[11 + 32 + 1];
 581         char buffer[16 + LINE_MAX + 1];
 582         struct iovec iovec[N_IOVEC_META_FIELDS + 4];
 583         int n = 0;
 584         va_list ap;
 585         struct ucred ucred;
 586
 587         assert(s);
 588         assert(format);
 589
 590         IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
 591         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
 592
 593         memcpy(buffer, "MESSAGE=", 8);
 594         va_start(ap, format);
 595         vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
 596         va_end(ap);
 597         char_array_0(buffer);
 598         IOVEC_SET_STRING(iovec[n++], buffer);
 599
 600         snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
 601         char_array_0(mid);
 602         IOVEC_SET_STRING(iovec[n++], mid);
 603
 604         zero(ucred);
 605         ucred.pid = getpid();
 606         ucred.uid = getuid();
 607         ucred.gid = getgid();
 608
 609         dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL);
 610 }
 611
 612 static void dispatch_message(Server *s,
 613                              struct iovec *iovec, unsigned n, unsigned m,
 614                              struct ucred *ucred,
 615                              struct timeval *tv,
 616                              int priority) {
 617         int rl;
 618         char *path = NULL, *c;
 619
 620         assert(s);
 621         assert(iovec || n == 0);
 622
 623         if (n == 0)
 624                 return;
 625
 626         if (!ucred)
 627                 goto finish;
 628
 629         path = shortened_cgroup_path(ucred->pid);
 630         if (!path)
 631                 goto finish;
 632
 633         /* example: /user/lennart/3/foobar
 634          *          /system/dbus.service/foobar
 635          *
 636          * So let's cut of everything past the third /, since that is
 637          * wher user directories start */
 638
 639         c = strchr(path, '/');
 640         if (c) {
 641                 c = strchr(c+1, '/');
 642                 if (c) {
 643                         c = strchr(c+1, '/');
 644                         if (c)
 645                                 *c = 0;
 646                 }
 647         }
 648
 649         rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
 650
 651         if (rl == 0) {
 652                 free(path);
 653                 return;
 654         }
 655
 656         /* Write a suppression message if we suppressed something */
 657         if (rl > 1)
 658                 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
 659
 660         free(path);
 661
 662 finish:
 663         dispatch_message_real(s, iovec, n, m, ucred, tv);
 664 }
 665
 666 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
 667         struct msghdr msghdr;
 668         struct cmsghdr *cmsg;
 669         union {
 670                 struct cmsghdr cmsghdr;
 671                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
 672         } control;
 673         union sockaddr_union sa;
 674
 675         assert(s);
 676         assert(iovec);
 677         assert(n_iovec > 0);
 678
 679         zero(msghdr);
 680         msghdr.msg_iov = (struct iovec*) iovec;
 681         msghdr.msg_iovlen = n_iovec;
 682
 683         zero(sa);
 684         sa.un.sun_family = AF_UNIX;
 685         strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
 686         msghdr.msg_name = &sa;
 687         msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
 688
 689         if (ucred) {
 690                 zero(control);
 691                 msghdr.msg_control = &control;
 692                 msghdr.msg_controllen = sizeof(control);
 693
 694                 cmsg = CMSG_FIRSTHDR(&msghdr);
 695                 cmsg->cmsg_level = SOL_SOCKET;
 696                 cmsg->cmsg_type = SCM_CREDENTIALS;
 697                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
 698                 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
 699                 msghdr.msg_controllen = cmsg->cmsg_len;
 700         }
 701
 702         /* Forward the syslog message we received via /dev/log to
 703          * /run/systemd/syslog. Unfortunately we currently can't set
 704          * the SO_TIMESTAMP auxiliary data, and hence we don't. */
 705
 706         if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
 707                 return;
 708
 709         if (ucred && errno == ESRCH) {
 710                 struct ucred u;
 711
 712                 /* Hmm, presumably the sender process vanished
 713                  * by now, so let's fix it as good as we
 714                  * can, and retry */
 715
 716                 u = *ucred;
 717                 u.pid = getpid();
 718                 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
 719
 720                 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
 721                         return;
 722         }
 723
 724         log_debug("Failed to forward syslog message: %m");
 725 }
 726
 727 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
 728         struct iovec iovec;
 729
 730         assert(s);
 731         assert(buffer);
 732
 733         IOVEC_SET_STRING(iovec, buffer);
 734         forward_syslog_iovec(s, &iovec, 1, ucred, tv);
 735 }
 736
 737 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
 738         struct iovec iovec[5];
 739         char header_priority[6], header_time[64], header_pid[16];
 740         int n = 0;
 741         time_t t;
 742         struct tm *tm;
 743         char *ident_buf = NULL;
 744
 745         assert(s);
 746         assert(priority >= 0);
 747         assert(priority <= 999);
 748         assert(message);
 749
 750         /* First: priority field */
 751         snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
 752         char_array_0(header_priority);
 753         IOVEC_SET_STRING(iovec[n++], header_priority);
 754
 755         /* Second: timestamp */
 756         t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
 757         tm = localtime(&t);
 758         if (!tm)
 759                 return;
 760         if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
 761                 return;
 762         IOVEC_SET_STRING(iovec[n++], header_time);
 763
 764         /* Third: identifier and PID */
 765         if (ucred) {
 766                 if (!identifier) {
 767                         get_process_comm(ucred->pid, &ident_buf);
 768                         identifier = ident_buf;
 769                 }
 770
 771                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 772                 char_array_0(header_pid);
 773
 774                 if (identifier)
 775                         IOVEC_SET_STRING(iovec[n++], identifier);
 776
 777                 IOVEC_SET_STRING(iovec[n++], header_pid);
 778         } else if (identifier) {
 779                 IOVEC_SET_STRING(iovec[n++], identifier);
 780                 IOVEC_SET_STRING(iovec[n++], ": ");
 781         }
 782
 783         /* Fourth: message */
 784         IOVEC_SET_STRING(iovec[n++], message);
 785
 786         forward_syslog_iovec(s, iovec, n, ucred, tv);
 787
 788         free(ident_buf);
 789 }
 790
 791 static int fixup_priority(int priority) {
 792
 793         if ((priority & LOG_FACMASK) == 0)
 794                 return (priority & LOG_PRIMASK) | LOG_USER;
 795
 796         return priority;
 797 }
 798
 799 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
 800         struct iovec iovec[5];
 801         char header_priority[6], header_pid[16];
 802         int n = 0;
 803         char *ident_buf = NULL;
 804         int fd;
 805
 806         assert(s);
 807         assert(priority >= 0);
 808         assert(priority <= 999);
 809         assert(message);
 810
 811         /* Never allow messages with kernel facility to be written to
 812          * kmsg, regardless where the data comes from. */
 813         priority = fixup_priority(priority);
 814
 815         /* First: priority field */
 816         snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
 817         char_array_0(header_priority);
 818         IOVEC_SET_STRING(iovec[n++], header_priority);
 819
 820         /* Second: identifier and PID */
 821         if (ucred) {
 822                 if (!identifier) {
 823                         get_process_comm(ucred->pid, &ident_buf);
 824                         identifier = ident_buf;
 825                 }
 826
 827                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 828                 char_array_0(header_pid);
 829
 830                 if (identifier)
 831                         IOVEC_SET_STRING(iovec[n++], identifier);
 832
 833                 IOVEC_SET_STRING(iovec[n++], header_pid);
 834         } else if (identifier) {
 835                 IOVEC_SET_STRING(iovec[n++], identifier);
 836                 IOVEC_SET_STRING(iovec[n++], ": ");
 837         }
 838
 839         /* Fourth: message */
 840         IOVEC_SET_STRING(iovec[n++], message);
 841         IOVEC_SET_STRING(iovec[n++], "\n");
 842
 843         fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 844         if (fd < 0) {
 845                 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
 846                 goto finish;
 847         }
 848
 849         if (writev(fd, iovec, n) < 0)
 850                 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
 851
 852         close_nointr_nofail(fd);
 853
 854 finish:
 855         free(ident_buf);
 856 }
 857
 858 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
 859         struct iovec iovec[4];
 860         char header_pid[16];
 861         int n = 0, fd;
 862         char *ident_buf = NULL;
 863
 864         assert(s);
 865         assert(message);
 866
 867         /* First: identifier and PID */
 868         if (ucred) {
 869                 if (!identifier) {
 870                         get_process_comm(ucred->pid, &ident_buf);
 871                         identifier = ident_buf;
 872                 }
 873
 874                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 875                 char_array_0(header_pid);
 876
 877                 if (identifier)
 878                         IOVEC_SET_STRING(iovec[n++], identifier);
 879
 880                 IOVEC_SET_STRING(iovec[n++], header_pid);
 881         } else if (identifier) {
 882                 IOVEC_SET_STRING(iovec[n++], identifier);
 883                 IOVEC_SET_STRING(iovec[n++], ": ");
 884         }
 885
 886         /* Third: message */
 887         IOVEC_SET_STRING(iovec[n++], message);
 888         IOVEC_SET_STRING(iovec[n++], "\n");
 889
 890         fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 891         if (fd < 0) {
 892                 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
 893                 goto finish;
 894         }
 895
 896         if (writev(fd, iovec, n) < 0)
 897                 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
 898
 899         close_nointr_nofail(fd);
 900
 901 finish:
 902         free(ident_buf);
 903 }
 904
 905 static void read_identifier(const char **buf, char **identifier) {
 906         const char *p;
 907         char *t;
 908         size_t l, e;
 909
 910         assert(buf);
 911         assert(identifier);
 912
 913         p = *buf;
 914
 915         p += strspn(p, WHITESPACE);
 916         l = strcspn(p, WHITESPACE);
 917
 918         if (l <= 0 ||
 919             p[l-1] != ':')
 920                 return;
 921
 922         e = l;
 923         l--;
 924
 925         if (p[l-1] == ']') {
 926                 size_t k = l-1;
 927
 928                 for (;;) {
 929
 930                         if (p[k] == '[') {
 931                                 l = k;
 932                                 break;
 933                         }
 934
 935                         if (k == 0)
 936                                 break;
 937
 938                         k--;
 939                 }
 940         }
 941
 942         t = strndup(p, l);
 943         if (t)
 944                 *identifier = t;
 945
 946         *buf = p + e;
 947         *buf += strspn(*buf, WHITESPACE);
 948 }
 949
 950 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
 951         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
 952         struct iovec iovec[N_IOVEC_META_FIELDS + 5];
 953         unsigned n = 0;
 954         int priority = LOG_USER | LOG_INFO;
 955         char *identifier = NULL;
 956
 957         assert(s);
 958         assert(buf);
 959
 960         if (s->forward_to_syslog)
 961                 forward_syslog_raw(s, buf, ucred, tv);
 962
 963         parse_syslog_priority((char**) &buf, &priority);
 964         skip_syslog_date((char**) &buf);
 965         read_identifier(&buf, &identifier);
 966
 967         if (s->forward_to_kmsg)
 968                 forward_kmsg(s, priority, identifier, buf, ucred);
 969
 970         if (s->forward_to_console)
 971                 forward_console(s, identifier, buf, ucred);
 972
 973         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
 974
 975         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
 976                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 977
 978         if (priority & LOG_FACMASK)
 979                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
 980                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
 981
 982         if (identifier) {
 983                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
 984                 if (syslog_identifier)
 985                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
 986         }
 987
 988         message = strappend("MESSAGE=", buf);
 989         if (message)
 990                 IOVEC_SET_STRING(iovec[n++], message);
 991
 992         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority);
 993
 994         free(message);
 995         free(identifier);
 996         free(syslog_priority);
 997         free(syslog_facility);
 998         free(syslog_identifier);
 999 }
1000
1001 static bool valid_user_field(const char *p, size_t l) {
1002         const char *a;
1003
1004         /* We kinda enforce POSIX syntax recommendations for
1005            environment variables here, but make a couple of additional
1006            requirements.
1007
1008            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1009
1010         /* No empty field names */
1011         if (l <= 0)
1012                 return false;
1013
1014         /* Don't allow names longer than 64 chars */
1015         if (l > 64)
1016                 return false;
1017
1018         /* Variables starting with an underscore are protected */
1019         if (p[0] == '_')
1020                 return false;
1021
1022         /* Don't allow digits as first character */
1023         if (p[0] >= '0' && p[0] <= '9')
1024                 return false;
1025
1026         /* Only allow A-Z0-9 and '_' */
1027         for (a = p; a < p + l; a++)
1028                 if (!((*a >= 'A' && *a <= 'Z') ||
1029                       (*a >= '0' && *a <= '9') ||
1030                       *a == '_'))
1031                         return false;
1032
1033         return true;
1034 }
1035
1036 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
1037         struct iovec *iovec = NULL;
1038         unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1039         const char *p;
1040         size_t remaining;
1041         int priority = LOG_INFO;
1042         char *identifier = NULL, *message = NULL;
1043
1044         assert(s);
1045         assert(buffer || n == 0);
1046
1047         p = buffer;
1048         remaining = buffer_size;
1049
1050         while (remaining > 0) {
1051                 const char *e, *q;
1052
1053                 e = memchr(p, '\n', remaining);
1054
1055                 if (!e) {
1056                         /* Trailing noise, let's ignore it, and flush what we collected */
1057                         log_debug("Received message with trailing noise, ignoring.");
1058                         break;
1059                 }
1060
1061                 if (e == p) {
1062                         /* Entry separator */
1063                         dispatch_message(s, iovec, n, m, ucred, tv, priority);
1064                         n = 0;
1065                         priority = LOG_INFO;
1066
1067                         p++;
1068                         remaining--;
1069                         continue;
1070                 }
1071
1072                 if (*p == '.' || *p == '#') {
1073                         /* Ignore control commands for now, and
1074                          * comments too. */
1075                         remaining -= (e - p) + 1;
1076                         p = e + 1;
1077                         continue;
1078                 }
1079
1080                 /* A property follows */
1081
1082                 if (n+N_IOVEC_META_FIELDS >= m) {
1083                         struct iovec *c;
1084                         unsigned u;
1085
1086                         u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1087                         c = realloc(iovec, u * sizeof(struct iovec));
1088                         if (!c) {
1089                                 log_error("Out of memory");
1090                                 break;
1091                         }
1092
1093                         iovec = c;
1094                         m = u;
1095                 }
1096
1097                 q = memchr(p, '=', e - p);
1098                 if (q) {
1099                         if (valid_user_field(p, q - p)) {
1100                                 size_t l;
1101
1102                                 l = e - p;
1103
1104                                 /* If the field name starts with an
1105                                  * underscore, skip the variable,
1106                                  * since that indidates a trusted
1107                                  * field */
1108                                 iovec[n].iov_base = (char*) p;
1109                                 iovec[n].iov_len = l;
1110                                 n++;
1111
1112                                 /* We need to determine the priority
1113                                  * of this entry for the rate limiting
1114                                  * logic */
1115                                 if (l == 10 &&
1116                                     memcmp(p, "PRIORITY=", 9) == 0 &&
1117                                     p[9] >= '0' && p[9] <= '9')
1118                                         priority = (priority & LOG_FACMASK) | (p[9] - '0');
1119
1120                                 else if (l == 17 &&
1121                                          memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1122                                          p[16] >= '0' && p[16] <= '9')
1123                                         priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1124
1125                                 else if (l == 18 &&
1126                                          memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1127                                          p[16] >= '0' && p[16] <= '9' &&
1128                                          p[17] >= '0' && p[17] <= '9')
1129                                         priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1130
1131                                 else if (l >= 12 &&
1132                                          memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1133                                         char *t;
1134
1135                                         t = strndup(p + 11, l - 11);
1136                                         if (t) {
1137                                                 free(identifier);
1138                                                 identifier = t;
1139                                         }
1140                                 } else if (l >= 8 &&
1141                                            memcmp(p, "MESSAGE=", 8) == 0) {
1142                                         char *t;
1143
1144                                         t = strndup(p + 8, l - 8);
1145                                         if (t) {
1146                                                 free(message);
1147                                                 message = t;
1148                                         }
1149                                 }
1150                         }
1151
1152                         remaining -= (e - p) + 1;
1153                         p = e + 1;
1154                         continue;
1155                 } else {
1156                         uint64_t l;
1157                         char *k;
1158
1159                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1160                                 log_debug("Failed to parse message, ignoring.");
1161                                 break;
1162                         }
1163
1164                         memcpy(&l, e + 1, sizeof(uint64_t));
1165                         l = le64toh(l);
1166
1167                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1168                             e[1+sizeof(uint64_t)+l] != '\n') {
1169                                 log_debug("Failed to parse message, ignoring.");
1170                                 break;
1171                         }
1172
1173                         k = malloc((e - p) + 1 + l);
1174                         if (!k) {
1175                                 log_error("Out of memory");
1176                                 break;
1177                         }
1178
1179                         memcpy(k, p, e - p);
1180                         k[e - p] = '=';
1181                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1182
1183                         if (valid_user_field(p, e - p)) {
1184                                 iovec[n].iov_base = k;
1185                                 iovec[n].iov_len = (e - p) + 1 + l;
1186                                 n++;
1187                         } else
1188                                 free(k);
1189
1190                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1191                         p = e + 1 + sizeof(uint64_t) + l + 1;
1192                 }
1193         }
1194
1195         if (n <= 0)
1196                 goto finish;
1197
1198         tn = n++;
1199         IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1200
1201         if (message) {
1202                 if (s->forward_to_syslog)
1203                         forward_syslog(s, priority, identifier, message, ucred, tv);
1204
1205                 if (s->forward_to_kmsg)
1206                         forward_kmsg(s, priority, identifier, message, ucred);
1207
1208                 if (s->forward_to_console)
1209                         forward_console(s, identifier, message, ucred);
1210         }
1211
1212         dispatch_message(s, iovec, n, m, ucred, tv, priority);
1213
1214 finish:
1215         for (j = 0; j < n; j++)  {
1216                 if (j == tn)
1217                         continue;
1218
1219                 if (iovec[j].iov_base < buffer ||
1220                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1221                         free(iovec[j].iov_base);
1222         }
1223
1224         free(identifier);
1225         free(message);
1226 }
1227
1228 static int stdout_stream_log(StdoutStream *s, const char *p) {
1229         struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1230         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1231         unsigned n = 0;
1232         int priority;
1233
1234         assert(s);
1235         assert(p);
1236
1237         priority = s->priority;
1238
1239         if (s->level_prefix)
1240                 parse_syslog_priority((char**) &p, &priority);
1241
1242         if (s->forward_to_syslog || s->server->forward_to_syslog)
1243                 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1244
1245         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1246                 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1247
1248         if (s->forward_to_console || s->server->forward_to_console)
1249                 forward_console(s->server, s->identifier, p, &s->ucred);
1250
1251         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1252
1253         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1254                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1255
1256         if (priority & LOG_FACMASK)
1257                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1258                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1259
1260         if (s->identifier) {
1261                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1262                 if (syslog_identifier)
1263                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1264         }
1265
1266         message = strappend("MESSAGE=", p);
1267         if (message)
1268                 IOVEC_SET_STRING(iovec[n++], message);
1269
1270         dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
1271
1272         free(message);
1273         free(syslog_priority);
1274         free(syslog_facility);
1275         free(syslog_identifier);
1276
1277         return 0;
1278 }
1279
1280 static int stdout_stream_line(StdoutStream *s, char *p) {
1281         int r;
1282
1283         assert(s);
1284         assert(p);
1285
1286         p = strstrip(p);
1287
1288         switch (s->state) {
1289
1290         case STDOUT_STREAM_IDENTIFIER:
1291                 s->identifier = strdup(p);
1292                 if (!s->identifier) {
1293                         log_error("Out of memory");
1294                         return -ENOMEM;
1295                 }
1296
1297                 s->state = STDOUT_STREAM_PRIORITY;
1298                 return 0;
1299
1300         case STDOUT_STREAM_PRIORITY:
1301                 r = safe_atoi(p, &s->priority);
1302                 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1303                         log_warning("Failed to parse log priority line.");
1304                         return -EINVAL;
1305                 }
1306
1307                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1308                 return 0;
1309
1310         case STDOUT_STREAM_LEVEL_PREFIX:
1311                 r = parse_boolean(p);
1312                 if (r < 0) {
1313                         log_warning("Failed to parse level prefix line.");
1314                         return -EINVAL;
1315                 }
1316
1317                 s->level_prefix = !!r;
1318                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1319                 return 0;
1320
1321         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1322                 r = parse_boolean(p);
1323                 if (r < 0) {
1324                         log_warning("Failed to parse forward to syslog line.");
1325                         return -EINVAL;
1326                 }
1327
1328                 s->forward_to_syslog = !!r;
1329                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1330                 return 0;
1331
1332         case STDOUT_STREAM_FORWARD_TO_KMSG:
1333                 r = parse_boolean(p);
1334                 if (r < 0) {
1335                         log_warning("Failed to parse copy to kmsg line.");
1336                         return -EINVAL;
1337                 }
1338
1339                 s->forward_to_kmsg = !!r;
1340                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1341                 return 0;
1342
1343         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1344                 r = parse_boolean(p);
1345                 if (r < 0) {
1346                         log_warning("Failed to parse copy to console line.");
1347                         return -EINVAL;
1348                 }
1349
1350                 s->forward_to_console = !!r;
1351                 s->state = STDOUT_STREAM_RUNNING;
1352                 return 0;
1353
1354         case STDOUT_STREAM_RUNNING:
1355                 return stdout_stream_log(s, p);
1356         }
1357
1358         assert_not_reached("Unknown stream state");
1359 }
1360
1361 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1362         char *p;
1363         size_t remaining;
1364         int r;
1365
1366         assert(s);
1367
1368         p = s->buffer;
1369         remaining = s->length;
1370         for (;;) {
1371                 char *end;
1372                 size_t skip;
1373
1374                 end = memchr(p, '\n', remaining);
1375                 if (end)
1376                         skip = end - p + 1;
1377                 else if (remaining >= sizeof(s->buffer) - 1) {
1378                         end = p + sizeof(s->buffer) - 1;
1379                         skip = sizeof(s->buffer) - 1;
1380                 } else
1381                         break;
1382
1383                 *end = 0;
1384
1385                 r = stdout_stream_line(s, p);
1386                 if (r < 0)
1387                         return r;
1388
1389                 remaining -= skip;
1390                 p += skip;
1391         }
1392
1393         if (force_flush && remaining > 0) {
1394                 p[remaining] = 0;
1395                 r = stdout_stream_line(s, p);
1396                 if (r < 0)
1397                         return r;
1398
1399                 p += remaining;
1400                 remaining = 0;
1401         }
1402
1403         if (p > s->buffer) {
1404                 memmove(s->buffer, p, remaining);
1405                 s->length = remaining;
1406         }
1407
1408         return 0;
1409 }
1410
1411 static int stdout_stream_process(StdoutStream *s) {
1412         ssize_t l;
1413         int r;
1414
1415         assert(s);
1416
1417         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1418         if (l < 0) {
1419
1420                 if (errno == EAGAIN)
1421                         return 0;
1422
1423                 log_warning("Failed to read from stream: %m");
1424                 return -errno;
1425         }
1426
1427         if (l == 0) {
1428                 r = stdout_stream_scan(s, true);
1429                 if (r < 0)
1430                         return r;
1431
1432                 return 0;
1433         }
1434
1435         s->length += l;
1436         r = stdout_stream_scan(s, false);
1437         if (r < 0)
1438                 return r;
1439
1440         return 1;
1441
1442 }
1443
1444 static void stdout_stream_free(StdoutStream *s) {
1445         assert(s);
1446
1447         if (s->server) {
1448                 assert(s->server->n_stdout_streams > 0);
1449                 s->server->n_stdout_streams --;
1450                 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1451         }
1452
1453         if (s->fd >= 0) {
1454                 if (s->server)
1455                         epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1456
1457                 close_nointr_nofail(s->fd);
1458         }
1459
1460         free(s->identifier);
1461         free(s);
1462 }
1463
1464 static int stdout_stream_new(Server *s) {
1465         StdoutStream *stream;
1466         int fd, r;
1467         socklen_t len;
1468         struct epoll_event ev;
1469
1470         assert(s);
1471
1472         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1473         if (fd < 0) {
1474                 if (errno == EAGAIN)
1475                         return 0;
1476
1477                 log_error("Failed to accept stdout connection: %m");
1478                 return -errno;
1479         }
1480
1481         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1482                 log_warning("Too many stdout streams, refusing connection.");
1483                 close_nointr_nofail(fd);
1484                 return 0;
1485         }
1486
1487         stream = new0(StdoutStream, 1);
1488         if (!stream) {
1489                 log_error("Out of memory.");
1490                 close_nointr_nofail(fd);
1491                 return -ENOMEM;
1492         }
1493
1494         stream->fd = fd;
1495
1496         len = sizeof(stream->ucred);
1497         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1498                 log_error("Failed to determine peer credentials: %m");
1499                 r = -errno;
1500                 goto fail;
1501         }
1502
1503         if (shutdown(fd, SHUT_WR) < 0) {
1504                 log_error("Failed to shutdown writing side of socket: %m");
1505                 r = -errno;
1506                 goto fail;
1507         }
1508
1509         zero(ev);
1510         ev.data.ptr = stream;
1511         ev.events = EPOLLIN;
1512         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1513                 log_error("Failed to add stream to event loop: %m");
1514                 r = -errno;
1515                 goto fail;
1516         }
1517
1518         stream->server = s;
1519         LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1520         s->n_stdout_streams ++;
1521
1522         return 0;
1523
1524 fail:
1525         stdout_stream_free(stream);
1526         return r;
1527 }
1528
1529 static int system_journal_open(Server *s) {
1530         int r;
1531         char *fn;
1532         sd_id128_t machine;
1533         char ids[33];
1534
1535         r = sd_id128_get_machine(&machine);
1536         if (r < 0)
1537                 return r;
1538
1539         sd_id128_to_string(machine, ids);
1540
1541         if (!s->system_journal) {
1542
1543                 /* First try to create the machine path, but not the prefix */
1544                 fn = strappend("/var/log/journal/", ids);
1545                 if (!fn)
1546                         return -ENOMEM;
1547                 (void) mkdir(fn, 0755);
1548                 free(fn);
1549
1550                 /* The create the system journal file */
1551                 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1552                 if (!fn)
1553                         return -ENOMEM;
1554
1555                 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1556                 free(fn);
1557
1558                 if (r >= 0) {
1559                         journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1560
1561                         s->system_journal->metrics = s->system_metrics;
1562                         s->system_journal->compress = s->compress;
1563
1564                         fix_perms(s->system_journal, 0);
1565                 } else if (r < 0) {
1566
1567                         if (r != -ENOENT && r != -EROFS)
1568                                 log_warning("Failed to open system journal: %s", strerror(-r));
1569
1570                         r = 0;
1571                 }
1572         }
1573
1574         if (!s->runtime_journal) {
1575
1576                 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1577                 if (!fn)
1578                         return -ENOMEM;
1579
1580                 if (s->system_journal) {
1581
1582                         /* Try to open the runtime journal, but only
1583                          * if it already exists, so that we can flush
1584                          * it into the system journal */
1585
1586                         r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1587                         free(fn);
1588
1589                         if (r < 0) {
1590                                 if (r != -ENOENT)
1591                                         log_warning("Failed to open runtime journal: %s", strerror(-r));
1592
1593                                 r = 0;
1594                         }
1595
1596                 } else {
1597
1598                         /* OK, we really need the runtime journal, so create
1599                          * it if necessary. */
1600
1601                         (void) mkdir_parents(fn, 0755);
1602                         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1603                         free(fn);
1604
1605                         if (r < 0) {
1606                                 log_error("Failed to open runtime journal: %s", strerror(-r));
1607                                 return r;
1608                         }
1609                 }
1610
1611                 if (s->runtime_journal) {
1612                         journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1613
1614                         s->runtime_journal->metrics = s->runtime_metrics;
1615                         s->runtime_journal->compress = s->compress;
1616
1617                         fix_perms(s->runtime_journal, 0);
1618                 }
1619         }
1620
1621         return r;
1622 }
1623
1624 static int server_flush_to_var(Server *s) {
1625         char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1626         Object *o = NULL;
1627         int r;
1628         sd_id128_t machine;
1629         sd_journal *j;
1630         usec_t ts;
1631
1632         assert(s);
1633
1634         if (!s->runtime_journal)
1635                 return 0;
1636
1637         ts = now(CLOCK_MONOTONIC);
1638         if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1639                 return 0;
1640
1641         s->var_available_timestamp = ts;
1642
1643         system_journal_open(s);
1644
1645         if (!s->system_journal)
1646                 return 0;
1647
1648         r = sd_id128_get_machine(&machine);
1649         if (r < 0) {
1650                 log_error("Failed to get machine id: %s", strerror(-r));
1651                 return r;
1652         }
1653
1654         r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1655         if (r < 0) {
1656                 log_error("Failed to read runtime journal: %s", strerror(-r));
1657                 return r;
1658         }
1659
1660         SD_JOURNAL_FOREACH(j) {
1661                 JournalFile *f;
1662
1663                 f = j->current_file;
1664                 assert(f && f->current_offset > 0);
1665
1666                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1667                 if (r < 0) {
1668                         log_error("Can't read entry: %s", strerror(-r));
1669                         goto finish;
1670                 }
1671
1672                 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1673                 if (r == -E2BIG) {
1674                         log_info("Allocation limit reached.");
1675
1676                         journal_file_post_change(s->system_journal);
1677                         server_rotate(s);
1678                         server_vacuum(s);
1679
1680                         r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1681                 }
1682
1683                 if (r < 0) {
1684                         log_error("Can't write entry: %s", strerror(-r));
1685                         goto finish;
1686                 }
1687         }
1688
1689 finish:
1690         journal_file_post_change(s->system_journal);
1691
1692         journal_file_close(s->runtime_journal);
1693         s->runtime_journal = NULL;
1694
1695         if (r >= 0) {
1696                 sd_id128_to_string(machine, path + 17);
1697                 rm_rf(path, false, true, false);
1698         }
1699
1700         return r;
1701 }
1702
1703 static int process_event(Server *s, struct epoll_event *ev) {
1704         assert(s);
1705
1706         if (ev->data.fd == s->signal_fd) {
1707                 struct signalfd_siginfo sfsi;
1708                 ssize_t n;
1709
1710                 if (ev->events != EPOLLIN) {
1711                         log_info("Got invalid event from epoll.");
1712                         return -EIO;
1713                 }
1714
1715                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
1716                 if (n != sizeof(sfsi)) {
1717
1718                         if (n >= 0)
1719                                 return -EIO;
1720
1721                         if (errno == EINTR || errno == EAGAIN)
1722                                 return 0;
1723
1724                         return -errno;
1725                 }
1726
1727                 if (sfsi.ssi_signo == SIGUSR1) {
1728                         server_flush_to_var(s);
1729                         return 0;
1730                 }
1731
1732                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1733                 return 0;
1734
1735         } else if (ev->data.fd == s->native_fd ||
1736                    ev->data.fd == s->syslog_fd) {
1737
1738                 if (ev->events != EPOLLIN) {
1739                         log_info("Got invalid event from epoll.");
1740                         return -EIO;
1741                 }
1742
1743                 for (;;) {
1744                         struct msghdr msghdr;
1745                         struct iovec iovec;
1746                         struct ucred *ucred = NULL;
1747                         struct timeval *tv = NULL;
1748                         struct cmsghdr *cmsg;
1749                         union {
1750                                 struct cmsghdr cmsghdr;
1751                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1752                                             CMSG_SPACE(sizeof(struct timeval))];
1753                         } control;
1754                         ssize_t n;
1755                         int v;
1756
1757                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
1758                                 log_error("SIOCINQ failed: %m");
1759                                 return -errno;
1760                         }
1761
1762                         if (v <= 0)
1763                                 return 1;
1764
1765                         if (s->buffer_size < (size_t) v) {
1766                                 void *b;
1767                                 size_t l;
1768
1769                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
1770                                 b = realloc(s->buffer, l+1);
1771
1772                                 if (!b) {
1773                                         log_error("Couldn't increase buffer.");
1774                                         return -ENOMEM;
1775                                 }
1776
1777                                 s->buffer_size = l;
1778                                 s->buffer = b;
1779                         }
1780
1781                         zero(iovec);
1782                         iovec.iov_base = s->buffer;
1783                         iovec.iov_len = s->buffer_size;
1784
1785                         zero(control);
1786                         zero(msghdr);
1787                         msghdr.msg_iov = &iovec;
1788                         msghdr.msg_iovlen = 1;
1789                         msghdr.msg_control = &control;
1790                         msghdr.msg_controllen = sizeof(control);
1791
1792                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
1793                         if (n < 0) {
1794
1795                                 if (errno == EINTR || errno == EAGAIN)
1796                                         return 1;
1797
1798                                 log_error("recvmsg() failed: %m");
1799                                 return -errno;
1800                         }
1801
1802                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
1803
1804                                 if (cmsg->cmsg_level == SOL_SOCKET &&
1805                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
1806                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
1807                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
1808                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
1809                                          cmsg->cmsg_type == SO_TIMESTAMP &&
1810                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
1811                                         tv = (struct timeval*) CMSG_DATA(cmsg);
1812                         }
1813
1814                         if (ev->data.fd == s->syslog_fd) {
1815                                 char *e;
1816
1817                                 e = memchr(s->buffer, '\n', n);
1818                                 if (e)
1819                                         *e = 0;
1820                                 else
1821                                         s->buffer[n] = 0;
1822
1823                                 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
1824                         } else
1825                                 process_native_message(s, s->buffer, n, ucred, tv);
1826                 }
1827
1828                 return 1;
1829
1830         } else if (ev->data.fd == s->stdout_fd) {
1831
1832                 if (ev->events != EPOLLIN) {
1833                         log_info("Got invalid event from epoll.");
1834                         return -EIO;
1835                 }
1836
1837                 stdout_stream_new(s);
1838                 return 1;
1839
1840         } else {
1841                 StdoutStream *stream;
1842
1843                 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
1844                         log_info("Got invalid event from epoll.");
1845                         return -EIO;
1846                 }
1847
1848                 /* If it is none of the well-known fds, it must be an
1849                  * stdout stream fd. Note that this is a bit ugly here
1850                  * (since we rely that none of the well-known fds
1851                  * could be interpreted as pointer), but nonetheless
1852                  * safe, since the well-known fds would never get an
1853                  * fd > 4096, i.e. beyond the first memory page */
1854
1855                 stream = ev->data.ptr;
1856
1857                 if (stdout_stream_process(stream) <= 0)
1858                         stdout_stream_free(stream);
1859
1860                 return 1;
1861         }
1862
1863         log_error("Unknown event.");
1864         return 0;
1865 }
1866
1867 static int open_syslog_socket(Server *s) {
1868         union sockaddr_union sa;
1869         int one, r;
1870         struct epoll_event ev;
1871         struct timeval tv;
1872
1873         assert(s);
1874
1875         if (s->syslog_fd < 0) {
1876
1877                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1878                 if (s->syslog_fd < 0) {
1879                         log_error("socket() failed: %m");
1880                         return -errno;
1881                 }
1882
1883                 zero(sa);
1884                 sa.un.sun_family = AF_UNIX;
1885                 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
1886
1887                 unlink(sa.un.sun_path);
1888
1889                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1890                 if (r < 0) {
1891                         log_error("bind() failed: %m");
1892                         return -errno;
1893                 }
1894
1895                 chmod(sa.un.sun_path, 0666);
1896         }
1897
1898         one = 1;
1899         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1900         if (r < 0) {
1901                 log_error("SO_PASSCRED failed: %m");
1902                 return -errno;
1903         }
1904
1905         one = 1;
1906         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1907         if (r < 0) {
1908                 log_error("SO_TIMESTAMP failed: %m");
1909                 return -errno;
1910         }
1911
1912         /* Since we use the same socket for forwarding this to some
1913          * other syslog implementation, make sure we don't hang
1914          * forever */
1915         timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
1916         if (setsockopt(s->syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
1917                 log_error("SO_SNDTIMEO failed: %m");
1918                 return -errno;
1919         }
1920
1921         zero(ev);
1922         ev.events = EPOLLIN;
1923         ev.data.fd = s->syslog_fd;
1924         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
1925                 log_error("Failed to add syslog server fd to epoll object: %m");
1926                 return -errno;
1927         }
1928
1929         return 0;
1930 }
1931
1932 static int open_native_socket(Server*s) {
1933         union sockaddr_union sa;
1934         int one, r;
1935         struct epoll_event ev;
1936
1937         assert(s);
1938
1939         if (s->native_fd < 0) {
1940
1941                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1942                 if (s->native_fd < 0) {
1943                         log_error("socket() failed: %m");
1944                         return -errno;
1945                 }
1946
1947                 zero(sa);
1948                 sa.un.sun_family = AF_UNIX;
1949                 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
1950
1951                 unlink(sa.un.sun_path);
1952
1953                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1954                 if (r < 0) {
1955                         log_error("bind() failed: %m");
1956                         return -errno;
1957                 }
1958
1959                 chmod(sa.un.sun_path, 0666);
1960         }
1961
1962         one = 1;
1963         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1964         if (r < 0) {
1965                 log_error("SO_PASSCRED failed: %m");
1966                 return -errno;
1967         }
1968
1969         one = 1;
1970         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1971         if (r < 0) {
1972                 log_error("SO_TIMESTAMP failed: %m");
1973                 return -errno;
1974         }
1975
1976         zero(ev);
1977         ev.events = EPOLLIN;
1978         ev.data.fd = s->native_fd;
1979         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
1980                 log_error("Failed to add native server fd to epoll object: %m");
1981                 return -errno;
1982         }
1983
1984         return 0;
1985 }
1986
1987 static int open_stdout_socket(Server *s) {
1988         union sockaddr_union sa;
1989         int r;
1990         struct epoll_event ev;
1991
1992         assert(s);
1993
1994         if (s->stdout_fd < 0) {
1995
1996                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
1997                 if (s->stdout_fd < 0) {
1998                         log_error("socket() failed: %m");
1999                         return -errno;
2000                 }
2001
2002                 zero(sa);
2003                 sa.un.sun_family = AF_UNIX;
2004                 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2005
2006                 unlink(sa.un.sun_path);
2007
2008                 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2009                 if (r < 0) {
2010                         log_error("bind() failed: %m");
2011                         return -errno;
2012                 }
2013
2014                 chmod(sa.un.sun_path, 0666);
2015
2016                 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2017                         log_error("liste() failed: %m");
2018                         return -errno;
2019                 }
2020         }
2021
2022         zero(ev);
2023         ev.events = EPOLLIN;
2024         ev.data.fd = s->stdout_fd;
2025         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2026                 log_error("Failed to add stdout server fd to epoll object: %m");
2027                 return -errno;
2028         }
2029
2030         return 0;
2031 }
2032
2033 static int open_signalfd(Server *s) {
2034         sigset_t mask;
2035         struct epoll_event ev;
2036
2037         assert(s);
2038
2039         assert_se(sigemptyset(&mask) == 0);
2040         sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2041         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2042
2043         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2044         if (s->signal_fd < 0) {
2045                 log_error("signalfd(): %m");
2046                 return -errno;
2047         }
2048
2049         zero(ev);
2050         ev.events = EPOLLIN;
2051         ev.data.fd = s->signal_fd;
2052
2053         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2054                 log_error("epoll_ctl(): %m");
2055                 return -errno;
2056         }
2057
2058         return 0;
2059 }
2060
2061 static int server_parse_proc_cmdline(Server *s) {
2062         char *line, *w, *state;
2063         int r;
2064         size_t l;
2065
2066         if (detect_container(NULL) > 0)
2067                 return 0;
2068
2069         r = read_one_line_file("/proc/cmdline", &line);
2070         if (r < 0) {
2071                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2072                 return 0;
2073         }
2074
2075         FOREACH_WORD_QUOTED(w, l, line, state) {
2076                 char *word;
2077
2078                 word = strndup(w, l);
2079                 if (!word) {
2080                         r = -ENOMEM;
2081                         goto finish;
2082                 }
2083
2084                 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2085                         r = parse_boolean(word + 35);
2086                         if (r < 0)
2087                                 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2088                         else
2089                                 s->forward_to_syslog = r;
2090                 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2091                         r = parse_boolean(word + 33);
2092                         if (r < 0)
2093                                 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2094                         else
2095                                 s->forward_to_kmsg = r;
2096                 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2097                         r = parse_boolean(word + 36);
2098                         if (r < 0)
2099                                 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2100                         else
2101                                 s->forward_to_console = r;
2102                 }
2103
2104                 free(word);
2105         }
2106
2107         r = 0;
2108
2109 finish:
2110         free(line);
2111         return r;
2112 }
2113
2114 static int server_parse_config_file(Server *s) {
2115         FILE *f;
2116         const char *fn;
2117         int r;
2118
2119         assert(s);
2120
2121         fn = "/etc/systemd/systemd-journald.conf";
2122         f = fopen(fn, "re");
2123         if (!f) {
2124                 if (errno == ENOENT)
2125                         return 0;
2126
2127                 log_warning("Failed to open configuration file %s: %m", fn);
2128                 return -errno;
2129         }
2130
2131         r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2132         if (r < 0)
2133                 log_warning("Failed to parse configuration file: %s", strerror(-r));
2134
2135         fclose(f);
2136
2137         return r;
2138 }
2139
2140 static int server_init(Server *s) {
2141         int n, r, fd;
2142
2143         assert(s);
2144
2145         zero(*s);
2146         s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = -1;
2147         s->compress = true;
2148
2149         s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2150         s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2151
2152         s->forward_to_syslog = true;
2153
2154         memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2155         memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2156
2157         server_parse_config_file(s);
2158         server_parse_proc_cmdline(s);
2159
2160         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2161         if (!s->user_journals) {
2162                 log_error("Out of memory.");
2163                 return -ENOMEM;
2164         }
2165
2166         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2167         if (s->epoll_fd < 0) {
2168                 log_error("Failed to create epoll object: %m");
2169                 return -errno;
2170         }
2171
2172         n = sd_listen_fds(true);
2173         if (n < 0) {
2174                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2175                 return n;
2176         }
2177
2178         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2179
2180                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2181
2182                         if (s->native_fd >= 0) {
2183                                 log_error("Too many native sockets passed.");
2184                                 return -EINVAL;
2185                         }
2186
2187                         s->native_fd = fd;
2188
2189                 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2190
2191                         if (s->stdout_fd >= 0) {
2192                                 log_error("Too many stdout sockets passed.");
2193                                 return -EINVAL;
2194                         }
2195
2196                         s->stdout_fd = fd;
2197
2198                 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2199
2200                         if (s->syslog_fd >= 0) {
2201                                 log_error("Too many /dev/log sockets passed.");
2202                                 return -EINVAL;
2203                         }
2204
2205                         s->syslog_fd = fd;
2206
2207                 } else {
2208                         log_error("Unknown socket passed.");
2209                         return -EINVAL;
2210                 }
2211         }
2212
2213         r = open_syslog_socket(s);
2214         if (r < 0)
2215                 return r;
2216
2217         r = open_native_socket(s);
2218         if (r < 0)
2219                 return r;
2220
2221         r = open_stdout_socket(s);
2222         if (r < 0)
2223                 return r;
2224
2225         r = system_journal_open(s);
2226         if (r < 0)
2227                 return r;
2228
2229         r = open_signalfd(s);
2230         if (r < 0)
2231                 return r;
2232
2233         s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2234         if (!s->rate_limit)
2235                 return -ENOMEM;
2236
2237         return 0;
2238 }
2239
2240 static void server_done(Server *s) {
2241         JournalFile *f;
2242         assert(s);
2243
2244         while (s->stdout_streams)
2245                 stdout_stream_free(s->stdout_streams);
2246
2247         if (s->system_journal)
2248                 journal_file_close(s->system_journal);
2249
2250         if (s->runtime_journal)
2251                 journal_file_close(s->runtime_journal);
2252
2253         while ((f = hashmap_steal_first(s->user_journals)))
2254                 journal_file_close(f);
2255
2256         hashmap_free(s->user_journals);
2257
2258         if (s->epoll_fd >= 0)
2259                 close_nointr_nofail(s->epoll_fd);
2260
2261         if (s->signal_fd >= 0)
2262                 close_nointr_nofail(s->signal_fd);
2263
2264         if (s->syslog_fd >= 0)
2265                 close_nointr_nofail(s->syslog_fd);
2266
2267         if (s->native_fd >= 0)
2268                 close_nointr_nofail(s->native_fd);
2269
2270         if (s->stdout_fd >= 0)
2271                 close_nointr_nofail(s->stdout_fd);
2272
2273         if (s->rate_limit)
2274                 journal_rate_limit_free(s->rate_limit);
2275
2276         free(s->buffer);
2277 }
2278
2279 int main(int argc, char *argv[]) {
2280         Server server;
2281         int r;
2282
2283         /* if (getppid() != 1) { */
2284         /*         log_error("This program should be invoked by init only."); */
2285         /*         return EXIT_FAILURE; */
2286         /* } */
2287
2288         if (argc > 1) {
2289                 log_error("This program does not take arguments.");
2290                 return EXIT_FAILURE;
2291         }
2292
2293         log_set_target(LOG_TARGET_CONSOLE);
2294         log_parse_environment();
2295         log_open();
2296
2297         umask(0022);
2298
2299         r = server_init(&server);
2300         if (r < 0)
2301                 goto finish;
2302
2303         server_vacuum(&server);
2304         server_flush_to_var(&server);
2305
2306         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2307         driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2308
2309         sd_notify(false,
2310                   "READY=1\n"
2311                   "STATUS=Processing requests...");
2312
2313         for (;;) {
2314                 struct epoll_event event;
2315
2316                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2317                 if (r < 0) {
2318
2319                         if (errno == EINTR)
2320                                 continue;
2321
2322                         log_error("epoll_wait() failed: %m");
2323                         r = -errno;
2324                         goto finish;
2325                 } else if (r == 0)
2326                         break;
2327
2328                 r = process_event(&server, &event);
2329                 if (r < 0)
2330                         goto finish;
2331                 else if (r == 0)
2332                         break;
2333         }
2334
2335         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2336         driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2337
2338 finish:
2339         sd_notify(false,
2340                   "STATUS=Shutting down...");
2341
2342         server_done(&server);
2343
2344         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
2345 }