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 "hashmap.h"
  36 #include "journal-file.h"
  37 #include "sd-daemon.h"
  38 #include "socket-util.h"
  39 #include "acl-util.h"
  40 #include "cgroup-util.h"
  41 #include "list.h"
  42 #include "journal-rate-limit.h"
  43
  44 #define USER_JOURNALS_MAX 1024
  45 #define STDOUT_STREAMS_MAX 4096
  46
  47 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
  48 #define DEFAULT_RATE_LIMIT_BURST 200
  49
  50 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
  51
  52 typedef struct StdoutStream StdoutStream;
  53
  54 typedef struct Server {
  55         int epoll_fd;
  56         int signal_fd;
  57         int syslog_fd;
  58         int native_fd;
  59         int stdout_fd;
  60
  61         JournalFile *runtime_journal;
  62         JournalFile *system_journal;
  63         Hashmap *user_journals;
  64
  65         uint64_t seqnum;
  66
  67         char *buffer;
  68         size_t buffer_size;
  69
  70         JournalRateLimit *rate_limit;
  71
  72         JournalMetrics metrics;
  73         uint64_t max_use;
  74         bool compress;
  75
  76         uint64_t cached_available_space;
  77         usec_t cached_available_space_timestamp;
  78
  79         LIST_HEAD(StdoutStream, stdout_streams);
  80         unsigned n_stdout_streams;
  81 } Server;
  82
  83 typedef enum StdoutStreamState {
  84         STDOUT_STREAM_TAG,
  85         STDOUT_STREAM_PRIORITY,
  86         STDOUT_STREAM_PRIORITY_PREFIX,
  87         STDOUT_STREAM_TEE_CONSOLE,
  88         STDOUT_STREAM_RUNNING
  89 } StdoutStreamState;
  90
  91 struct StdoutStream {
  92         Server *server;
  93         StdoutStreamState state;
  94
  95         int fd;
  96
  97         struct ucred ucred;
  98
  99         char *tag;
 100         int priority;
 101         bool priority_prefix:1;
 102         bool tee_console:1;
 103
 104         char buffer[LINE_MAX+1];
 105         size_t length;
 106
 107         LIST_FIELDS(StdoutStream, stdout_stream);
 108 };
 109
 110 static uint64_t available_space(Server *s) {
 111         char ids[33];
 112         sd_id128_t machine;
 113         char *p;
 114         const char *f;
 115         struct statvfs ss;
 116         uint64_t sum = 0, avail = 0, ss_avail = 0;
 117         int r;
 118         DIR *d;
 119         usec_t ts = now(CLOCK_MONOTONIC);
 120
 121         if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
 122                 return s->cached_available_space;
 123
 124         r = sd_id128_get_machine(&machine);
 125         if (r < 0)
 126                 return 0;
 127
 128         if (s->system_journal)
 129                 f = "/var/log/journal/";
 130         else
 131                 f = "/run/log/journal/";
 132
 133         p = strappend(f, sd_id128_to_string(machine, ids));
 134         if (!p)
 135                 return 0;
 136
 137         d = opendir(p);
 138         free(p);
 139
 140         if (!d)
 141                 return 0;
 142
 143         if (fstatvfs(dirfd(d), &ss) < 0)
 144                 goto finish;
 145
 146         for (;;) {
 147                 struct stat st;
 148                 struct dirent buf, *de;
 149                 int k;
 150
 151                 k = readdir_r(d, &buf, &de);
 152                 if (k != 0) {
 153                         r = -k;
 154                         goto finish;
 155                 }
 156
 157                 if (!de)
 158                         break;
 159
 160                 if (!dirent_is_file_with_suffix(de, ".journal"))
 161                         continue;
 162
 163                 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
 164                         continue;
 165
 166                 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
 167         }
 168
 169         avail = sum >= s->max_use ? 0 : s->max_use - sum;
 170
 171         ss_avail = ss.f_bsize * ss.f_bavail;
 172
 173         ss_avail = ss_avail < s->metrics.keep_free ? 0 : ss_avail - s->metrics.keep_free;
 174
 175         if (ss_avail < avail)
 176                 avail = ss_avail;
 177
 178         s->cached_available_space = avail;
 179         s->cached_available_space_timestamp = ts;
 180
 181 finish:
 182         closedir(d);
 183
 184         return avail;
 185 }
 186
 187 static void fix_perms(JournalFile *f, uid_t uid) {
 188         acl_t acl;
 189         acl_entry_t entry;
 190         acl_permset_t permset;
 191         int r;
 192
 193         assert(f);
 194
 195         r = fchmod_and_fchown(f->fd, 0640, 0, 0);
 196         if (r < 0)
 197                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
 198
 199         if (uid <= 0)
 200                 return;
 201
 202         acl = acl_get_fd(f->fd);
 203         if (!acl) {
 204                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
 205                 return;
 206         }
 207
 208         r = acl_find_uid(acl, uid, &entry);
 209         if (r <= 0) {
 210
 211                 if (acl_create_entry(&acl, &entry) < 0 ||
 212                     acl_set_tag_type(entry, ACL_USER) < 0 ||
 213                     acl_set_qualifier(entry, &uid) < 0) {
 214                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 215                         goto finish;
 216                 }
 217         }
 218
 219         if (acl_get_permset(entry, &permset) < 0 ||
 220             acl_add_perm(permset, ACL_READ) < 0 ||
 221             acl_calc_mask(&acl) < 0) {
 222                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 223                 goto finish;
 224         }
 225
 226         if (acl_set_fd(f->fd, acl) < 0)
 227                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
 228
 229 finish:
 230         acl_free(acl);
 231 }
 232
 233 static JournalFile* find_journal(Server *s, uid_t uid) {
 234         char *p;
 235         int r;
 236         JournalFile *f;
 237         char ids[33];
 238         sd_id128_t machine;
 239
 240         assert(s);
 241
 242         /* We split up user logs only on /var, not on /run */
 243         if (!s->system_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->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_vacuum(Server *s) {
 287         Iterator i;
 288         void *k;
 289         char *p;
 290         char ids[33];
 291         sd_id128_t machine;
 292         int r;
 293         JournalFile *f;
 294
 295         log_info("Rotating...");
 296
 297         if (s->runtime_journal) {
 298                 r = journal_file_rotate(&s->runtime_journal);
 299                 if (r < 0)
 300                         log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
 301         }
 302
 303         if (s->system_journal) {
 304                 r = journal_file_rotate(&s->system_journal);
 305                 if (r < 0)
 306                         log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
 307         }
 308
 309         HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
 310                 r = journal_file_rotate(&f);
 311                 if (r < 0)
 312                         log_error("Failed to rotate %s: %s", f->path, strerror(-r));
 313                 else
 314                         hashmap_replace(s->user_journals, k, f);
 315         }
 316
 317         log_info("Vacuuming...");
 318
 319         r = sd_id128_get_machine(&machine);
 320         if (r < 0) {
 321                 log_error("Failed to get machine ID: %s", strerror(-r));
 322                 return;
 323         }
 324
 325         if (asprintf(&p, "/var/log/journal/%s", sd_id128_to_string(machine, ids)) < 0) {
 326                 log_error("Out of memory.");
 327                 return;
 328         }
 329
 330         r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);
 331         if (r < 0 && r != -ENOENT)
 332                 log_error("Failed to vacuum %s: %s", p, strerror(-r));
 333         free(p);
 334
 335         if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
 336                 log_error("Out of memory.");
 337                 return;
 338         }
 339
 340         r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);
 341         if (r < 0 && r != -ENOENT)
 342                 log_error("Failed to vacuum %s: %s", p, strerror(-r));
 343         free(p);
 344
 345         s->cached_available_space_timestamp = 0;
 346 }
 347
 348 static char *shortened_cgroup_path(pid_t pid) {
 349         int r;
 350         char *process_path, *init_path, *path;
 351
 352         assert(pid > 0);
 353
 354         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
 355         if (r < 0)
 356                 return NULL;
 357
 358         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
 359         if (r < 0) {
 360                 free(process_path);
 361                 return NULL;
 362         }
 363
 364         if (streq(init_path, "/"))
 365                 init_path[0] = 0;
 366
 367         if (startswith(process_path, init_path))
 368                 path = process_path + strlen(init_path);
 369         else
 370                 path = process_path;
 371
 372         free(init_path);
 373
 374         return path;
 375 }
 376
 377 static void dispatch_message_real(Server *s,
 378                              struct iovec *iovec, unsigned n, unsigned m,
 379                              struct ucred *ucred,
 380                              struct timeval *tv) {
 381
 382         char *pid = NULL, *uid = NULL, *gid = NULL,
 383                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 384                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 385                 *audit_session = NULL, *audit_loginuid = NULL,
 386                 *exe = NULL, *cgroup = NULL;
 387
 388         char idbuf[33];
 389         sd_id128_t id;
 390         int r;
 391         char *t;
 392         uid_t loginuid = 0, realuid = 0;
 393         JournalFile *f;
 394         bool vacuumed = false;
 395
 396         assert(s);
 397         assert(iovec);
 398         assert(n > 0);
 399         assert(n + 13 <= m);
 400
 401         if (ucred) {
 402                 uint32_t session;
 403                 char *path;
 404
 405                 realuid = ucred->uid;
 406
 407                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 408                         IOVEC_SET_STRING(iovec[n++], pid);
 409
 410                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 411                         IOVEC_SET_STRING(iovec[n++], uid);
 412
 413                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 414                         IOVEC_SET_STRING(iovec[n++], gid);
 415
 416                 r = get_process_comm(ucred->pid, &t);
 417                 if (r >= 0) {
 418                         comm = strappend("_COMM=", t);
 419                         if (comm)
 420                                 IOVEC_SET_STRING(iovec[n++], comm);
 421                         free(t);
 422                 }
 423
 424                 r = get_process_exe(ucred->pid, &t);
 425                 if (r >= 0) {
 426                         exe = strappend("_EXE=", t);
 427                         if (comm)
 428                                 IOVEC_SET_STRING(iovec[n++], exe);
 429                         free(t);
 430                 }
 431
 432                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 433                 if (r >= 0) {
 434                         cmdline = strappend("_CMDLINE=", t);
 435                         if (cmdline)
 436                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 437                         free(t);
 438                 }
 439
 440                 r = audit_session_from_pid(ucred->pid, &session);
 441                 if (r >= 0)
 442                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0)
 443                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 444
 445                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 446                 if (r >= 0)
 447                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 448                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 449
 450                 path = shortened_cgroup_path(ucred->pid);
 451                 if (path) {
 452                         cgroup = strappend("_SYSTEMD_CGROUP=", path);
 453                         if (cgroup)
 454                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 455
 456                         free(path);
 457                 }
 458         }
 459
 460         if (tv) {
 461                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 462                              (unsigned long long) timeval_load(tv)) >= 0)
 463                         IOVEC_SET_STRING(iovec[n++], source_time);
 464         }
 465
 466         /* Note that strictly speaking storing the boot id here is
 467          * redundant since the entry includes this in-line
 468          * anyway. However, we need this indexed, too. */
 469         r = sd_id128_get_boot(&id);
 470         if (r >= 0)
 471                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 472                         IOVEC_SET_STRING(iovec[n++], boot_id);
 473
 474         r = sd_id128_get_machine(&id);
 475         if (r >= 0)
 476                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 477                         IOVEC_SET_STRING(iovec[n++], machine_id);
 478
 479         t = gethostname_malloc();
 480         if (t) {
 481                 hostname = strappend("_HOSTNAME=", t);
 482                 if (hostname)
 483                         IOVEC_SET_STRING(iovec[n++], hostname);
 484                 free(t);
 485         }
 486
 487         assert(n <= m);
 488
 489 retry:
 490         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 491         if (!f)
 492                 log_warning("Dropping message, as we can't find a place to store the data.");
 493         else {
 494                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 495
 496                 if (r == -E2BIG && !vacuumed) {
 497                         log_info("Allocation limit reached.");
 498
 499                         server_vacuum(s);
 500                         vacuumed = true;
 501
 502                         log_info("Retrying write.");
 503                         goto retry;
 504                 }
 505
 506                 if (r < 0)
 507                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 508         }
 509
 510         free(pid);
 511         free(uid);
 512         free(gid);
 513         free(comm);
 514         free(exe);
 515         free(cmdline);
 516         free(source_time);
 517         free(boot_id);
 518         free(machine_id);
 519         free(hostname);
 520         free(audit_session);
 521         free(audit_loginuid);
 522         free(cgroup);
 523 }
 524
 525 static void dispatch_message(Server *s,
 526                              struct iovec *iovec, unsigned n, unsigned m,
 527                              struct ucred *ucred,
 528                              struct timeval *tv,
 529                              int priority) {
 530         int rl;
 531         char *path, *c;
 532
 533         assert(s);
 534         assert(iovec || n == 0);
 535
 536         if (n == 0)
 537                 return;
 538
 539         if (!ucred)
 540                 goto finish;
 541
 542         path = shortened_cgroup_path(ucred->pid);
 543         if (!path)
 544                 goto finish;
 545
 546         /* example: /user/lennart/3/foobar
 547          *          /system/dbus.service/foobar
 548          *
 549          * So let's cut of everything past the third /, since that is
 550          * wher user directories start */
 551
 552         c = strchr(path, '/');
 553         if (c) {
 554                 c = strchr(c+1, '/');
 555                 if (c) {
 556                         c = strchr(c+1, '/');
 557                         if (c)
 558                                 *c = 0;
 559                 }
 560         }
 561
 562         rl = journal_rate_limit_test(s->rate_limit, path, priority, available_space(s));
 563
 564         if (rl == 0) {
 565                 free(path);
 566                 return;
 567         }
 568
 569         if (rl > 1) {
 570                 int j = 0;
 571                 char suppress_message[LINE_MAX];
 572                 struct iovec suppress_iovec[15];
 573
 574                 /* Write a suppression message if we suppressed something */
 575
 576                 snprintf(suppress_message, sizeof(suppress_message), "MESSAGE=Suppressed %u messages from %s", rl - 1, path);
 577                 char_array_0(suppress_message);
 578
 579                 IOVEC_SET_STRING(suppress_iovec[j++], "PRIORITY=5");
 580                 IOVEC_SET_STRING(suppress_iovec[j++], suppress_message);
 581
 582                 dispatch_message_real(s, suppress_iovec, j, ELEMENTSOF(suppress_iovec), NULL, NULL);
 583         }
 584
 585         free(path);
 586
 587 finish:
 588         dispatch_message_real(s, iovec, n, m, ucred, tv);
 589 }
 590
 591 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
 592         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL;
 593         struct iovec iovec[16];
 594         unsigned n = 0;
 595         int priority = LOG_USER | LOG_INFO;
 596
 597         assert(s);
 598         assert(buf);
 599
 600         parse_syslog_priority((char**) &buf, &priority);
 601         skip_syslog_date((char**) &buf);
 602
 603         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
 604                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 605
 606         if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
 607                 IOVEC_SET_STRING(iovec[n++], syslog_facility);
 608
 609         message = strappend("MESSAGE=", buf);
 610         if (message)
 611                 IOVEC_SET_STRING(iovec[n++], message);
 612
 613         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority & LOG_PRIMASK);
 614
 615         free(message);
 616         free(syslog_facility);
 617         free(syslog_priority);
 618 }
 619
 620 static bool valid_user_field(const char *p, size_t l) {
 621         const char *a;
 622
 623         /* We kinda enforce POSIX syntax recommendations for
 624            environment variables here, but make a couple of additional
 625            requirements.
 626
 627            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
 628
 629         /* No empty field names */
 630         if (l <= 0)
 631                 return false;
 632
 633         /* Don't allow names longer than 64 chars */
 634         if (l > 64)
 635                 return false;
 636
 637         /* Variables starting with an underscore are protected */
 638         if (p[0] == '_')
 639                 return false;
 640
 641         /* Don't allow digits as first character */
 642         if (p[0] >= '0' && p[0] <= '9')
 643                 return false;
 644
 645         /* Only allow A-Z0-9 and '_' */
 646         for (a = p; a < p + l; a++)
 647                 if (!((*a >= 'A' && *a <= 'Z') ||
 648                       (*a >= '0' && *a <= '9') ||
 649                       *a == '_'))
 650                         return false;
 651
 652         return true;
 653 }
 654
 655 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
 656         struct iovec *iovec = NULL;
 657         unsigned n = 0, m = 0, j;
 658         const char *p;
 659         size_t remaining;
 660         int priority = LOG_INFO;
 661
 662         assert(s);
 663         assert(buffer || n == 0);
 664
 665         p = buffer;
 666         remaining = buffer_size;
 667
 668         while (remaining > 0) {
 669                 const char *e, *q;
 670
 671                 e = memchr(p, '\n', remaining);
 672
 673                 if (!e) {
 674                         /* Trailing noise, let's ignore it, and flush what we collected */
 675                         log_debug("Received message with trailing noise, ignoring.");
 676                         break;
 677                 }
 678
 679                 if (e == p) {
 680                         /* Entry separator */
 681                         dispatch_message(s, iovec, n, m, ucred, tv, priority);
 682                         n = 0;
 683                         priority = LOG_INFO;
 684
 685                         p++;
 686                         remaining--;
 687                         continue;
 688                 }
 689
 690                 if (*p == '.' || *p == '#') {
 691                         /* Ignore control commands for now, and
 692                          * comments too. */
 693                         remaining -= (e - p) + 1;
 694                         p = e + 1;
 695                         continue;
 696                 }
 697
 698                 /* A property follows */
 699
 700                 if (n+13 >= m) {
 701                         struct iovec *c;
 702                         unsigned u;
 703
 704                         u = MAX((n+13U) * 2U, 4U);
 705                         c = realloc(iovec, u * sizeof(struct iovec));
 706                         if (!c) {
 707                                 log_error("Out of memory");
 708                                 break;
 709                         }
 710
 711                         iovec = c;
 712                         m = u;
 713                 }
 714
 715                 q = memchr(p, '=', e - p);
 716                 if (q) {
 717                         if (valid_user_field(p, q - p)) {
 718                                 /* If the field name starts with an
 719                                  * underscore, skip the variable,
 720                                  * since that indidates a trusted
 721                                  * field */
 722                                 iovec[n].iov_base = (char*) p;
 723                                 iovec[n].iov_len = e - p;
 724                                 n++;
 725
 726                                 /* We need to determine the priority
 727                                  * of this entry for the rate limiting
 728                                  * logic */
 729                                 if (e - p == 10 &&
 730                                     memcmp(p, "PRIORITY=", 10) == 0 &&
 731                                     p[10] >= '0' &&
 732                                     p[10] <= '9')
 733                                         priority = p[10] - '0';
 734                         }
 735
 736                         remaining -= (e - p) + 1;
 737                         p = e + 1;
 738                         continue;
 739                 } else {
 740                         uint64_t l;
 741                         char *k;
 742
 743                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
 744                                 log_debug("Failed to parse message, ignoring.");
 745                                 break;
 746                         }
 747
 748                         memcpy(&l, e + 1, sizeof(uint64_t));
 749                         l = le64toh(l);
 750
 751                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
 752                             e[1+sizeof(uint64_t)+l] != '\n') {
 753                                 log_debug("Failed to parse message, ignoring.");
 754                                 break;
 755                         }
 756
 757                         k = malloc((e - p) + 1 + l);
 758                         if (!k) {
 759                                 log_error("Out of memory");
 760                                 break;
 761                         }
 762
 763                         memcpy(k, p, e - p);
 764                         k[e - p] = '=';
 765                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
 766
 767                         if (valid_user_field(p, e - p)) {
 768                                 iovec[n].iov_base = k;
 769                                 iovec[n].iov_len = (e - p) + 1 + l;
 770                                 n++;
 771                         } else
 772                                 free(k);
 773
 774                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
 775                         p = e + 1 + sizeof(uint64_t) + l + 1;
 776                 }
 777         }
 778
 779         dispatch_message(s, iovec, n, m, ucred, tv, priority);
 780
 781         for (j = 0; j < n; j++)
 782                 if (iovec[j].iov_base < buffer ||
 783                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
 784                         free(iovec[j].iov_base);
 785 }
 786
 787 static int stdout_stream_log(StdoutStream *s, const char *p, size_t l) {
 788         struct iovec iovec[15];
 789         char *message = NULL, *syslog_priority = NULL;
 790         unsigned n = 0;
 791         size_t tag_len;
 792         int priority;
 793
 794         assert(s);
 795         assert(p);
 796
 797         priority = s->priority;
 798
 799         if (s->priority_prefix &&
 800             l > 3 &&
 801             p[0] == '<' &&
 802             p[1] >= '0' && p[1] <= '7' &&
 803             p[2] == '>') {
 804
 805                 priority = p[1] - '0';
 806                 p += 3;
 807                 l -= 3;
 808         }
 809
 810         if (l <= 0)
 811                 return 0;
 812
 813         if (asprintf(&syslog_priority, "PRIORITY=%i", priority) >= 0)
 814                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 815
 816         tag_len = s->tag ? strlen(s->tag) + 2: 0;
 817         message = malloc(8 + tag_len + l);
 818         if (message) {
 819                 memcpy(message, "MESSAGE=", 8);
 820
 821                 if (s->tag) {
 822                         memcpy(message+8, s->tag, tag_len-2);
 823                         memcpy(message+8+tag_len-2, ": ", 2);
 824                 }
 825
 826                 memcpy(message+8+tag_len, p, l);
 827                 iovec[n].iov_base = message;
 828                 iovec[n].iov_len = 8+tag_len+l;
 829                 n++;
 830         }
 831
 832         dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
 833
 834         if (s->tee_console) {
 835                 int console;
 836
 837                 console = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 838                 if (console >= 0) {
 839                         n = 0;
 840                         if (s->tag) {
 841                                 IOVEC_SET_STRING(iovec[n++], s->tag);
 842                                 IOVEC_SET_STRING(iovec[n++], ": ");
 843                         }
 844
 845                         iovec[n].iov_base = (void*) p;
 846                         iovec[n].iov_len = l;
 847                         n++;
 848
 849                         IOVEC_SET_STRING(iovec[n++], (char*) "\n");
 850
 851                         writev(console, iovec, n);
 852                 }
 853         }
 854
 855         free(message);
 856         free(syslog_priority);
 857
 858         return 0;
 859 }
 860
 861 static int stdout_stream_line(StdoutStream *s, const char *p, size_t l) {
 862         assert(s);
 863         assert(p);
 864
 865         while (l > 0 && strchr(WHITESPACE, *p)) {
 866                 l--;
 867                 p++;
 868         }
 869
 870         while (l > 0 && strchr(WHITESPACE, *(p+l-1)))
 871                 l--;
 872
 873         switch (s->state) {
 874
 875         case STDOUT_STREAM_TAG:
 876
 877                 if (l > 0) {
 878                         s->tag = strndup(p, l);
 879                         if (!s->tag) {
 880                                 log_error("Out of memory");
 881                                 return -EINVAL;
 882                         }
 883                 }
 884
 885                 s->state = STDOUT_STREAM_PRIORITY;
 886                 return 0;
 887
 888         case STDOUT_STREAM_PRIORITY:
 889                 if (l != 1 || *p < '0' || *p > '7') {
 890                         log_warning("Failed to parse log priority line.");
 891                         return -EINVAL;
 892                 }
 893
 894                 s->priority = *p - '0';
 895                 s->state = STDOUT_STREAM_PRIORITY_PREFIX;
 896                 return 0;
 897
 898         case STDOUT_STREAM_PRIORITY_PREFIX:
 899                 if (l != 1 || *p < '0' || *p > '1') {
 900                         log_warning("Failed to parse priority prefix line.");
 901                         return -EINVAL;
 902                 }
 903
 904                 s->priority_prefix = *p - '0';
 905                 s->state = STDOUT_STREAM_TEE_CONSOLE;
 906                 return 0;
 907
 908         case STDOUT_STREAM_TEE_CONSOLE:
 909                 if (l != 1 || *p < '0' || *p > '1') {
 910                         log_warning("Failed to parse tee to console line.");
 911                         return -EINVAL;
 912                 }
 913
 914                 s->tee_console = *p - '0';
 915                 s->state = STDOUT_STREAM_RUNNING;
 916                 return 0;
 917
 918         case STDOUT_STREAM_RUNNING:
 919                 return stdout_stream_log(s, p, l);
 920         }
 921
 922         assert_not_reached("Unknown stream state");
 923 }
 924
 925 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 926         char *p;
 927         size_t remaining;
 928         int r;
 929
 930         assert(s);
 931
 932         p = s->buffer;
 933         remaining = s->length;
 934         for (;;) {
 935                 char *end;
 936                 size_t skip;
 937
 938                 end = memchr(p, '\n', remaining);
 939                 if (!end) {
 940                         if (remaining >= LINE_MAX) {
 941                                 end = p + LINE_MAX;
 942                                 skip = LINE_MAX;
 943                         } else
 944                                 break;
 945                 } else
 946                         skip = end - p + 1;
 947
 948                 r = stdout_stream_line(s, p, end - p);
 949                 if (r < 0)
 950                         return r;
 951
 952                 remaining -= skip;
 953                 p += skip;
 954         }
 955
 956         if (force_flush && remaining > 0) {
 957                 r = stdout_stream_line(s, p, remaining);
 958                 if (r < 0)
 959                         return r;
 960
 961                 p += remaining;
 962                 remaining = 0;
 963         }
 964
 965         if (p > s->buffer) {
 966                 memmove(s->buffer, p, remaining);
 967                 s->length = remaining;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static int stdout_stream_process(StdoutStream *s) {
 974         ssize_t l;
 975         int r;
 976
 977         assert(s);
 978
 979         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
 980         if (l < 0) {
 981
 982                 if (errno == EAGAIN)
 983                         return 0;
 984
 985                 log_warning("Failed to read from stream: %m");
 986                 return -errno;
 987         }
 988
 989         if (l == 0) {
 990                 r = stdout_stream_scan(s, true);
 991                 if (r < 0)
 992                         return r;
 993
 994                 return 0;
 995         }
 996
 997         s->length += l;
 998         r = stdout_stream_scan(s, false);
 999         if (r < 0)
1000                 return r;
1001
1002         return 1;
1003
1004 }
1005
1006 static void stdout_stream_free(StdoutStream *s) {
1007         assert(s);
1008
1009         if (s->server) {
1010                 assert(s->server->n_stdout_streams > 0);
1011                 s->server->n_stdout_streams --;
1012                 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1013         }
1014
1015         if (s->fd >= 0) {
1016                 if (s->server)
1017                         epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1018
1019                 close_nointr_nofail(s->fd);
1020         }
1021
1022         free(s->tag);
1023         free(s);
1024 }
1025
1026 static int stdout_stream_new(Server *s) {
1027         StdoutStream *stream;
1028         int fd, r;
1029         socklen_t len;
1030         struct epoll_event ev;
1031
1032         assert(s);
1033
1034         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1035         if (fd < 0) {
1036                 if (errno == EAGAIN)
1037                         return 0;
1038
1039                 log_error("Failed to accept stdout connection: %m");
1040                 return -errno;
1041         }
1042
1043         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1044                 log_warning("Too many stdout streams, refusing connection.");
1045                 close_nointr_nofail(fd);
1046                 return 0;
1047         }
1048
1049         stream = new0(StdoutStream, 1);
1050         if (!stream) {
1051                 log_error("Out of memory.");
1052                 close_nointr_nofail(fd);
1053                 return -ENOMEM;
1054         }
1055
1056         stream->fd = fd;
1057
1058         len = sizeof(stream->ucred);
1059         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1060                 log_error("Failed to determine peer credentials: %m");
1061                 r = -errno;
1062                 goto fail;
1063         }
1064
1065         if (shutdown(fd, SHUT_WR) < 0) {
1066                 log_error("Failed to shutdown writing side of socket: %m");
1067                 r = -errno;
1068                 goto fail;
1069         }
1070
1071         zero(ev);
1072         ev.data.ptr = stream;
1073         ev.events = EPOLLIN;
1074         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1075                 log_error("Failed to add stream to event loop: %m");
1076                 r = -errno;
1077                 goto fail;
1078         }
1079
1080         stream->server = s;
1081         LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1082         s->n_stdout_streams ++;
1083
1084         return 0;
1085
1086 fail:
1087         stdout_stream_free(stream);
1088         return r;
1089 }
1090
1091 static int process_event(Server *s, struct epoll_event *ev) {
1092         assert(s);
1093
1094         if (ev->data.fd == s->signal_fd) {
1095                 struct signalfd_siginfo sfsi;
1096                 ssize_t n;
1097
1098                 if (ev->events != EPOLLIN) {
1099                         log_info("Got invalid event from epoll.");
1100                         return -EIO;
1101                 }
1102
1103                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
1104                 if (n != sizeof(sfsi)) {
1105
1106                         if (n >= 0)
1107                                 return -EIO;
1108
1109                         if (errno == EINTR || errno == EAGAIN)
1110                                 return 0;
1111
1112                         return -errno;
1113                 }
1114
1115                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1116                 return 0;
1117
1118         } else if (ev->data.fd == s->native_fd ||
1119                    ev->data.fd == s->syslog_fd) {
1120
1121                 if (ev->events != EPOLLIN) {
1122                         log_info("Got invalid event from epoll.");
1123                         return -EIO;
1124                 }
1125
1126                 for (;;) {
1127                         struct msghdr msghdr;
1128                         struct iovec iovec;
1129                         struct ucred *ucred = NULL;
1130                         struct timeval *tv = NULL;
1131                         struct cmsghdr *cmsg;
1132                         union {
1133                                 struct cmsghdr cmsghdr;
1134                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1135                                             CMSG_SPACE(sizeof(struct timeval))];
1136                         } control;
1137                         ssize_t n;
1138                         int v;
1139
1140                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
1141                                 log_error("SIOCINQ failed: %m");
1142                                 return -errno;
1143                         }
1144
1145                         if (v <= 0)
1146                                 return 1;
1147
1148                         if (s->buffer_size < (size_t) v) {
1149                                 void *b;
1150                                 size_t l;
1151
1152                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
1153                                 b = realloc(s->buffer, l+1);
1154
1155                                 if (!b) {
1156                                         log_error("Couldn't increase buffer.");
1157                                         return -ENOMEM;
1158                                 }
1159
1160                                 s->buffer_size = l;
1161                                 s->buffer = b;
1162                         }
1163
1164                         zero(iovec);
1165                         iovec.iov_base = s->buffer;
1166                         iovec.iov_len = s->buffer_size;
1167
1168                         zero(control);
1169                         zero(msghdr);
1170                         msghdr.msg_iov = &iovec;
1171                         msghdr.msg_iovlen = 1;
1172                         msghdr.msg_control = &control;
1173                         msghdr.msg_controllen = sizeof(control);
1174
1175                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
1176                         if (n < 0) {
1177
1178                                 if (errno == EINTR || errno == EAGAIN)
1179                                         return 1;
1180
1181                                 log_error("recvmsg() failed: %m");
1182                                 return -errno;
1183                         }
1184
1185                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
1186
1187                                 if (cmsg->cmsg_level == SOL_SOCKET &&
1188                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
1189                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
1190                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
1191                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
1192                                          cmsg->cmsg_type == SO_TIMESTAMP &&
1193                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
1194                                         tv = (struct timeval*) CMSG_DATA(cmsg);
1195                         }
1196
1197                         if (ev->data.fd == s->syslog_fd) {
1198                                 char *e;
1199
1200                                 e = memchr(s->buffer, '\n', n);
1201                                 if (e)
1202                                         *e = 0;
1203                                 else
1204                                         s->buffer[n] = 0;
1205
1206                                 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
1207                         } else
1208                                 process_native_message(s, s->buffer, n, ucred, tv);
1209                 }
1210
1211                 return 1;
1212
1213         } else if (ev->data.fd == s->stdout_fd) {
1214
1215                 if (ev->events != EPOLLIN) {
1216                         log_info("Got invalid event from epoll.");
1217                         return -EIO;
1218                 }
1219
1220                 stdout_stream_new(s);
1221                 return 1;
1222
1223         } else {
1224                 StdoutStream *stream;
1225
1226                 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
1227                         log_info("Got invalid event from epoll.");
1228                         return -EIO;
1229                 }
1230
1231                 /* If it is none of the well-known fds, it must be an
1232                  * stdout stream fd. Note that this is a bit ugly here
1233                  * (since we rely that none of the well-known fds
1234                  * could be interpreted as pointer), but nonetheless
1235                  * safe, since the well-known fds would never get an
1236                  * fd > 4096, i.e. beyond the first memory page */
1237
1238                 stream = ev->data.ptr;
1239
1240                 if (stdout_stream_process(stream) <= 0)
1241                         stdout_stream_free(stream);
1242
1243                 return 1;
1244         }
1245
1246         log_error("Unknown event.");
1247         return 0;
1248 }
1249
1250 static int system_journal_open(Server *s) {
1251         int r;
1252         char *fn;
1253         sd_id128_t machine;
1254         char ids[33];
1255
1256         r = sd_id128_get_machine(&machine);
1257         if (r < 0)
1258                 return r;
1259
1260         /* First try to create the machine path, but not the prefix */
1261         fn = strappend("/var/log/journal/", sd_id128_to_string(machine, ids));
1262         if (!fn)
1263                 return -ENOMEM;
1264         (void) mkdir(fn, 0755);
1265         free(fn);
1266
1267         /* The create the system journal file */
1268         fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1269         if (!fn)
1270                 return -ENOMEM;
1271
1272         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1273         free(fn);
1274
1275         if (r >= 0) {
1276                 s->system_journal->metrics = s->metrics;
1277                 s->system_journal->compress = s->compress;
1278
1279                 fix_perms(s->system_journal, 0);
1280                 return r;
1281         }
1282
1283         if (r < 0 && r != -ENOENT) {
1284                 log_error("Failed to open system journal: %s", strerror(-r));
1285                 return r;
1286         }
1287
1288         /* /var didn't work, so try /run, but this time we
1289          * create the prefix too */
1290         fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1291         if (!fn)
1292                 return -ENOMEM;
1293
1294         (void) mkdir_parents(fn, 0755);
1295         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1296         free(fn);
1297
1298         if (r < 0) {
1299                 log_error("Failed to open runtime journal: %s", strerror(-r));
1300                 return r;
1301         }
1302
1303         s->runtime_journal->metrics = s->metrics;
1304         s->runtime_journal->compress = s->compress;
1305
1306         fix_perms(s->runtime_journal, 0);
1307         return r;
1308 }
1309
1310 static int open_syslog_socket(Server *s) {
1311         union sockaddr_union sa;
1312         int one, r;
1313         struct epoll_event ev;
1314
1315         assert(s);
1316
1317         if (s->syslog_fd < 0) {
1318
1319                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1320                 if (s->syslog_fd < 0) {
1321                         log_error("socket() failed: %m");
1322                         return -errno;
1323                 }
1324
1325                 zero(sa);
1326                 sa.un.sun_family = AF_UNIX;
1327                 strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));
1328
1329                 unlink(sa.un.sun_path);
1330
1331                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1332                 if (r < 0) {
1333                         log_error("bind() failed: %m");
1334                         return -errno;
1335                 }
1336
1337                 chmod(sa.un.sun_path, 0666);
1338         }
1339
1340         one = 1;
1341         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1342         if (r < 0) {
1343                 log_error("SO_PASSCRED failed: %m");
1344                 return -errno;
1345         }
1346
1347         one = 1;
1348         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1349         if (r < 0) {
1350                 log_error("SO_TIMESTAMP failed: %m");
1351                 return -errno;
1352         }
1353
1354         zero(ev);
1355         ev.events = EPOLLIN;
1356         ev.data.fd = s->syslog_fd;
1357         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
1358                 log_error("Failed to add syslog server fd to epoll object: %m");
1359                 return -errno;
1360         }
1361
1362         return 0;
1363 }
1364
1365 static int open_native_socket(Server*s) {
1366         union sockaddr_union sa;
1367         int one, r;
1368         struct epoll_event ev;
1369
1370         assert(s);
1371
1372         if (s->native_fd < 0) {
1373
1374                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1375                 if (s->native_fd < 0) {
1376                         log_error("socket() failed: %m");
1377                         return -errno;
1378                 }
1379
1380                 zero(sa);
1381                 sa.un.sun_family = AF_UNIX;
1382                 strncpy(sa.un.sun_path, "/run/systemd/journal", sizeof(sa.un.sun_path));
1383
1384                 unlink(sa.un.sun_path);
1385
1386                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1387                 if (r < 0) {
1388                         log_error("bind() failed: %m");
1389                         return -errno;
1390                 }
1391
1392                 chmod(sa.un.sun_path, 0666);
1393         }
1394
1395         one = 1;
1396         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1397         if (r < 0) {
1398                 log_error("SO_PASSCRED failed: %m");
1399                 return -errno;
1400         }
1401
1402         one = 1;
1403         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1404         if (r < 0) {
1405                 log_error("SO_TIMESTAMP failed: %m");
1406                 return -errno;
1407         }
1408
1409         zero(ev);
1410         ev.events = EPOLLIN;
1411         ev.data.fd = s->native_fd;
1412         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
1413                 log_error("Failed to add native server fd to epoll object: %m");
1414                 return -errno;
1415         }
1416
1417         return 0;
1418 }
1419
1420 static int open_stdout_socket(Server *s) {
1421         union sockaddr_union sa;
1422         int r;
1423         struct epoll_event ev;
1424
1425         assert(s);
1426
1427         if (s->stdout_fd < 0) {
1428
1429                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
1430                 if (s->stdout_fd < 0) {
1431                         log_error("socket() failed: %m");
1432                         return -errno;
1433                 }
1434
1435                 zero(sa);
1436                 sa.un.sun_family = AF_UNIX;
1437                 strncpy(sa.un.sun_path, "/run/systemd/stdout", sizeof(sa.un.sun_path));
1438
1439                 unlink(sa.un.sun_path);
1440
1441                 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1442                 if (r < 0) {
1443                         log_error("bind() failed: %m");
1444                         return -errno;
1445                 }
1446
1447                 chmod(sa.un.sun_path, 0666);
1448
1449                 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
1450                         log_error("liste() failed: %m");
1451                         return -errno;
1452                 }
1453         }
1454
1455         zero(ev);
1456         ev.events = EPOLLIN;
1457         ev.data.fd = s->stdout_fd;
1458         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
1459                 log_error("Failed to add stdout server fd to epoll object: %m");
1460                 return -errno;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int open_signalfd(Server *s) {
1467         sigset_t mask;
1468         struct epoll_event ev;
1469
1470         assert(s);
1471
1472         assert_se(sigemptyset(&mask) == 0);
1473         sigset_add_many(&mask, SIGINT, SIGTERM, -1);
1474         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
1475
1476         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1477         if (s->signal_fd < 0) {
1478                 log_error("signalfd(): %m");
1479                 return -errno;
1480         }
1481
1482         zero(ev);
1483         ev.events = EPOLLIN;
1484         ev.data.fd = s->signal_fd;
1485
1486         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
1487                 log_error("epoll_ctl(): %m");
1488                 return -errno;
1489         }
1490
1491         return 0;
1492 }
1493
1494 static int server_init(Server *s) {
1495         int n, r, fd;
1496
1497         assert(s);
1498
1499         zero(*s);
1500         s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = -1;
1501         s->metrics.max_size = DEFAULT_MAX_SIZE;
1502         s->metrics.min_size = DEFAULT_MIN_SIZE;
1503         s->metrics.keep_free = DEFAULT_KEEP_FREE;
1504         s->max_use = DEFAULT_MAX_USE;
1505         s->compress = true;
1506
1507         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
1508         if (!s->user_journals) {
1509                 log_error("Out of memory.");
1510                 return -ENOMEM;
1511         }
1512
1513         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1514         if (s->epoll_fd < 0) {
1515                 log_error("Failed to create epoll object: %m");
1516                 return -errno;
1517         }
1518
1519         n = sd_listen_fds(true);
1520         if (n < 0) {
1521                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
1522                 return n;
1523         }
1524
1525         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
1526
1527                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/native", 0) > 0) {
1528
1529                         if (s->native_fd >= 0) {
1530                                 log_error("Too many native sockets passed.");
1531                                 return -EINVAL;
1532                         }
1533
1534                         s->native_fd = fd;
1535
1536                 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/stdout", 0) > 0) {
1537
1538                         if (s->stdout_fd >= 0) {
1539                                 log_error("Too many stdout sockets passed.");
1540                                 return -EINVAL;
1541                         }
1542
1543                         s->stdout_fd = fd;
1544
1545                 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
1546
1547                         if (s->syslog_fd >= 0) {
1548                                 log_error("Too many /dev/log sockets passed.");
1549                                 return -EINVAL;
1550                         }
1551
1552                         s->syslog_fd = fd;
1553
1554                 } else {
1555                         log_error("Unknown socket passed.");
1556                         return -EINVAL;
1557                 }
1558         }
1559
1560         r = open_syslog_socket(s);
1561         if (r < 0)
1562                 return r;
1563
1564         r = open_native_socket(s);
1565         if (r < 0)
1566                 return r;
1567
1568         r = open_stdout_socket(s);
1569         if (r < 0)
1570                 return r;
1571
1572         r = system_journal_open(s);
1573         if (r < 0)
1574                 return r;
1575
1576         r = open_signalfd(s);
1577         if (r < 0)
1578                 return r;
1579
1580         s->rate_limit = journal_rate_limit_new(DEFAULT_RATE_LIMIT_INTERVAL, DEFAULT_RATE_LIMIT_BURST);
1581         if (!s->rate_limit)
1582                 return -ENOMEM;
1583
1584         return 0;
1585 }
1586
1587 static void server_done(Server *s) {
1588         JournalFile *f;
1589         assert(s);
1590
1591         while (s->stdout_streams)
1592                 stdout_stream_free(s->stdout_streams);
1593
1594         if (s->system_journal)
1595                 journal_file_close(s->system_journal);
1596
1597         if (s->runtime_journal)
1598                 journal_file_close(s->runtime_journal);
1599
1600         while ((f = hashmap_steal_first(s->user_journals)))
1601                 journal_file_close(f);
1602
1603         hashmap_free(s->user_journals);
1604
1605         if (s->epoll_fd >= 0)
1606                 close_nointr_nofail(s->epoll_fd);
1607
1608         if (s->signal_fd >= 0)
1609                 close_nointr_nofail(s->signal_fd);
1610
1611         if (s->syslog_fd >= 0)
1612                 close_nointr_nofail(s->syslog_fd);
1613
1614         if (s->native_fd >= 0)
1615                 close_nointr_nofail(s->native_fd);
1616
1617         if (s->stdout_fd >= 0)
1618                 close_nointr_nofail(s->stdout_fd);
1619
1620         if (s->rate_limit)
1621                 journal_rate_limit_free(s->rate_limit);
1622 }
1623
1624 int main(int argc, char *argv[]) {
1625         Server server;
1626         int r;
1627
1628         /* if (getppid() != 1) { */
1629         /*         log_error("This program should be invoked by init only."); */
1630         /*         return EXIT_FAILURE; */
1631         /* } */
1632
1633         if (argc > 1) {
1634                 log_error("This program does not take arguments.");
1635                 return EXIT_FAILURE;
1636         }
1637
1638         log_set_target(LOG_TARGET_CONSOLE);
1639         log_set_max_level(LOG_DEBUG);
1640         log_parse_environment();
1641         log_open();
1642
1643         umask(0022);
1644
1645         r = server_init(&server);
1646         if (r < 0)
1647                 goto finish;
1648
1649         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
1650
1651         sd_notify(false,
1652                   "READY=1\n"
1653                   "STATUS=Processing requests...");
1654
1655         for (;;) {
1656                 struct epoll_event event;
1657
1658                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
1659                 if (r < 0) {
1660
1661                         if (errno == EINTR)
1662                                 continue;
1663
1664                         log_error("epoll_wait() failed: %m");
1665                         r = -errno;
1666                         goto finish;
1667                 } else if (r == 0)
1668                         break;
1669
1670                 r = process_event(&server, &event);
1671                 if (r < 0)
1672                         goto finish;
1673                 else if (r == 0)
1674                         break;
1675         }
1676
1677         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
1678
1679 finish:
1680         sd_notify(false,
1681                   "STATUS=Shutting down...");
1682
1683         server_done(&server);
1684
1685         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1686 }