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 typedef struct StdoutStream StdoutStream;
  48
  49 typedef struct Server {
  50         int epoll_fd;
  51         int signal_fd;
  52         int syslog_fd;
  53         int native_fd;
  54         int stdout_fd;
  55
  56         JournalFile *runtime_journal;
  57         JournalFile *system_journal;
  58         Hashmap *user_journals;
  59
  60         uint64_t seqnum;
  61
  62         char *buffer;
  63         size_t buffer_size;
  64
  65         JournalRateLimit *rate_limit;
  66
  67         JournalMetrics metrics;
  68         uint64_t max_use;
  69         bool compress;
  70
  71         LIST_HEAD(StdoutStream, stdout_streams);
  72         unsigned n_stdout_streams;
  73 } Server;
  74
  75 typedef enum StdoutStreamState {
  76         STDOUT_STREAM_TAG,
  77         STDOUT_STREAM_PRIORITY,
  78         STDOUT_STREAM_PRIORITY_PREFIX,
  79         STDOUT_STREAM_TEE_CONSOLE,
  80         STDOUT_STREAM_RUNNING
  81 } StdoutStreamState;
  82
  83 struct StdoutStream {
  84         Server *server;
  85         StdoutStreamState state;
  86
  87         int fd;
  88
  89         struct ucred ucred;
  90
  91         char *tag;
  92         int priority;
  93         bool priority_prefix:1;
  94         bool tee_console:1;
  95
  96         char buffer[LINE_MAX+1];
  97         size_t length;
  98
  99         LIST_FIELDS(StdoutStream, stdout_stream);
 100 };
 101
 102 static uint64_t available_space(Server *s) {
 103         char ids[33];
 104         sd_id128_t machine;
 105         char *p;
 106         const char *f;
 107         struct statvfs ss;
 108         uint64_t sum = 0, avail = 0, ss_avail = 0;
 109         int r;
 110         DIR *d;
 111
 112         r = sd_id128_get_machine(&machine);
 113         if (r < 0)
 114                 return 0;
 115
 116         if (s->system_journal)
 117                 f = "/var/log/journal/";
 118         else
 119                 f = "/run/log/journal/";
 120
 121         p = strappend(f, sd_id128_to_string(machine, ids));
 122         if (!p)
 123                 return 0;
 124
 125         d = opendir(p);
 126         free(p);
 127
 128         if (!d)
 129                 return 0;
 130
 131         if (fstatvfs(dirfd(d), &ss) < 0)
 132                 goto finish;
 133
 134         for (;;) {
 135                 struct stat st;
 136                 struct dirent buf, *de;
 137                 int k;
 138
 139                 k = readdir_r(d, &buf, &de);
 140                 if (k != 0) {
 141                         r = -k;
 142                         goto finish;
 143                 }
 144
 145                 if (!de)
 146                         break;
 147
 148                 if (!dirent_is_file_with_suffix(de, ".journal"))
 149                         continue;
 150
 151                 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
 152                         continue;
 153
 154                 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
 155         }
 156
 157         avail = sum >= s->max_use ? 0 : s->max_use - sum;
 158
 159         ss_avail = ss.f_bsize * ss.f_bavail;
 160
 161         ss_avail = ss_avail < s->metrics.keep_free ? 0 : ss_avail - s->metrics.keep_free;
 162
 163         if (ss_avail < avail)
 164                 avail = ss_avail;
 165
 166 finish:
 167         closedir(d);
 168
 169         return avail;
 170 }
 171
 172 static void fix_perms(JournalFile *f, uid_t uid) {
 173         acl_t acl;
 174         acl_entry_t entry;
 175         acl_permset_t permset;
 176         int r;
 177
 178         assert(f);
 179
 180         r = fchmod_and_fchown(f->fd, 0640, 0, 0);
 181         if (r < 0)
 182                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
 183
 184         if (uid <= 0)
 185                 return;
 186
 187         acl = acl_get_fd(f->fd);
 188         if (!acl) {
 189                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
 190                 return;
 191         }
 192
 193         r = acl_find_uid(acl, uid, &entry);
 194         if (r <= 0) {
 195
 196                 if (acl_create_entry(&acl, &entry) < 0 ||
 197                     acl_set_tag_type(entry, ACL_USER) < 0 ||
 198                     acl_set_qualifier(entry, &uid) < 0) {
 199                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 200                         goto finish;
 201                 }
 202         }
 203
 204         if (acl_get_permset(entry, &permset) < 0 ||
 205             acl_add_perm(permset, ACL_READ) < 0 ||
 206             acl_calc_mask(&acl) < 0) {
 207                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 208                 goto finish;
 209         }
 210
 211         if (acl_set_fd(f->fd, acl) < 0)
 212                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
 213
 214 finish:
 215         acl_free(acl);
 216 }
 217
 218 static JournalFile* find_journal(Server *s, uid_t uid) {
 219         char *p;
 220         int r;
 221         JournalFile *f;
 222         char ids[33];
 223         sd_id128_t machine;
 224
 225         assert(s);
 226
 227         /* We split up user logs only on /var, not on /run */
 228         if (!s->system_journal)
 229                 return s->runtime_journal;
 230
 231         if (uid <= 0)
 232                 return s->system_journal;
 233
 234         r = sd_id128_get_machine(&machine);
 235         if (r < 0)
 236                 return s->system_journal;
 237
 238         f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
 239         if (f)
 240                 return f;
 241
 242         if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
 243                 return s->system_journal;
 244
 245         while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
 246                 /* Too many open? Then let's close one */
 247                 f = hashmap_steal_first(s->user_journals);
 248                 assert(f);
 249                 journal_file_close(f);
 250         }
 251
 252         r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
 253         free(p);
 254
 255         if (r < 0)
 256                 return s->system_journal;
 257
 258         fix_perms(f, uid);
 259         f->metrics = s->metrics;
 260         f->compress = s->compress;
 261
 262         r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
 263         if (r < 0) {
 264                 journal_file_close(f);
 265                 return s->system_journal;
 266         }
 267
 268         return f;
 269 }
 270
 271 static void server_vacuum(Server *s) {
 272         Iterator i;
 273         void *k;
 274         char *p;
 275         char ids[33];
 276         sd_id128_t machine;
 277         int r;
 278         JournalFile *f;
 279
 280         log_info("Rotating...");
 281
 282         if (s->runtime_journal) {
 283                 r = journal_file_rotate(&s->runtime_journal);
 284                 if (r < 0)
 285                         log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
 286         }
 287
 288         if (s->system_journal) {
 289                 r = journal_file_rotate(&s->system_journal);
 290                 if (r < 0)
 291                         log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
 292         }
 293
 294         HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
 295                 r = journal_file_rotate(&f);
 296                 if (r < 0)
 297                         log_error("Failed to rotate %s: %s", f->path, strerror(-r));
 298                 else
 299                         hashmap_replace(s->user_journals, k, f);
 300         }
 301
 302         log_info("Vacuuming...");
 303
 304         r = sd_id128_get_machine(&machine);
 305         if (r < 0) {
 306                 log_error("Failed to get machine ID: %s", strerror(-r));
 307                 return;
 308         }
 309
 310         if (asprintf(&p, "/var/log/journal/%s", sd_id128_to_string(machine, ids)) < 0) {
 311                 log_error("Out of memory.");
 312                 return;
 313         }
 314
 315         r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);
 316         if (r < 0 && r != -ENOENT)
 317                 log_error("Failed to vacuum %s: %s", p, strerror(-r));
 318         free(p);
 319
 320         if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
 321                 log_error("Out of memory.");
 322                 return;
 323         }
 324
 325         r = journal_directory_vacuum(p, s->max_use, s->metrics.keep_free);
 326         if (r < 0 && r != -ENOENT)
 327                 log_error("Failed to vacuum %s: %s", p, strerror(-r));
 328         free(p);
 329 }
 330
 331 static char *shortened_cgroup_path(pid_t pid) {
 332         int r;
 333         char *process_path, *init_path, *path;
 334
 335         assert(pid > 0);
 336
 337         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
 338         if (r < 0)
 339                 return NULL;
 340
 341         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
 342         if (r < 0) {
 343                 free(process_path);
 344                 return NULL;
 345         }
 346
 347         if (streq(init_path, "/"))
 348                 init_path[0] = 0;
 349
 350         if (startswith(process_path, init_path))
 351                 path = process_path + strlen(init_path);
 352         else
 353                 path = process_path;
 354
 355         free(init_path);
 356
 357         return path;
 358 }
 359
 360 static void dispatch_message_real(Server *s,
 361                              struct iovec *iovec, unsigned n, unsigned m,
 362                              struct ucred *ucred,
 363                              struct timeval *tv) {
 364
 365         char *pid = NULL, *uid = NULL, *gid = NULL,
 366                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 367                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 368                 *audit_session = NULL, *audit_loginuid = NULL,
 369                 *exe = NULL, *cgroup = NULL;
 370
 371         char idbuf[33];
 372         sd_id128_t id;
 373         int r;
 374         char *t;
 375         uid_t loginuid = 0, realuid = 0;
 376         JournalFile *f;
 377         bool vacuumed = false;
 378
 379         assert(s);
 380         assert(iovec);
 381         assert(n > 0);
 382         assert(n + 13 <= m);
 383
 384         if (ucred) {
 385                 uint32_t session;
 386                 char *path;
 387
 388                 realuid = ucred->uid;
 389
 390                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 391                         IOVEC_SET_STRING(iovec[n++], pid);
 392
 393                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 394                         IOVEC_SET_STRING(iovec[n++], uid);
 395
 396                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 397                         IOVEC_SET_STRING(iovec[n++], gid);
 398
 399                 r = get_process_comm(ucred->pid, &t);
 400                 if (r >= 0) {
 401                         comm = strappend("_COMM=", t);
 402                         if (comm)
 403                                 IOVEC_SET_STRING(iovec[n++], comm);
 404                         free(t);
 405                 }
 406
 407                 r = get_process_exe(ucred->pid, &t);
 408                 if (r >= 0) {
 409                         exe = strappend("_EXE=", t);
 410                         if (comm)
 411                                 IOVEC_SET_STRING(iovec[n++], exe);
 412                         free(t);
 413                 }
 414
 415                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 416                 if (r >= 0) {
 417                         cmdline = strappend("_CMDLINE=", t);
 418                         if (cmdline)
 419                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 420                         free(t);
 421                 }
 422
 423                 r = audit_session_from_pid(ucred->pid, &session);
 424                 if (r >= 0)
 425                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0)
 426                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 427
 428                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 429                 if (r >= 0)
 430                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 431                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 432
 433                 path = shortened_cgroup_path(ucred->pid);
 434                 if (path) {
 435                         cgroup = strappend("_SYSTEMD_CGROUP=", path);
 436                         if (cgroup)
 437                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 438
 439                         free(path);
 440                 }
 441         }
 442
 443         if (tv) {
 444                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 445                              (unsigned long long) timeval_load(tv)) >= 0)
 446                         IOVEC_SET_STRING(iovec[n++], source_time);
 447         }
 448
 449         /* Note that strictly speaking storing the boot id here is
 450          * redundant since the entry includes this in-line
 451          * anyway. However, we need this indexed, too. */
 452         r = sd_id128_get_boot(&id);
 453         if (r >= 0)
 454                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 455                         IOVEC_SET_STRING(iovec[n++], boot_id);
 456
 457         r = sd_id128_get_machine(&id);
 458         if (r >= 0)
 459                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 460                         IOVEC_SET_STRING(iovec[n++], machine_id);
 461
 462         t = gethostname_malloc();
 463         if (t) {
 464                 hostname = strappend("_HOSTNAME=", t);
 465                 if (hostname)
 466                         IOVEC_SET_STRING(iovec[n++], hostname);
 467                 free(t);
 468         }
 469
 470         assert(n <= m);
 471
 472 retry:
 473         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 474         if (!f)
 475                 log_warning("Dropping message, as we can't find a place to store the data.");
 476         else {
 477                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 478
 479                 if (r == -E2BIG && !vacuumed) {
 480                         log_info("Allocation limit reached.");
 481
 482                         server_vacuum(s);
 483                         vacuumed = true;
 484
 485                         log_info("Retrying write.");
 486                         goto retry;
 487                 }
 488
 489                 if (r < 0)
 490                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 491         }
 492
 493         free(pid);
 494         free(uid);
 495         free(gid);
 496         free(comm);
 497         free(exe);
 498         free(cmdline);
 499         free(source_time);
 500         free(boot_id);
 501         free(machine_id);
 502         free(hostname);
 503         free(audit_session);
 504         free(audit_loginuid);
 505         free(cgroup);
 506 }
 507
 508 static void dispatch_message(Server *s,
 509                              struct iovec *iovec, unsigned n, unsigned m,
 510                              struct ucred *ucred,
 511                              struct timeval *tv,
 512                              int priority) {
 513         int rl;
 514         char *path, *c;
 515
 516         assert(s);
 517         assert(iovec || n == 0);
 518
 519         if (n == 0)
 520                 return;
 521
 522         if (!ucred)
 523                 goto finish;
 524
 525         path = shortened_cgroup_path(ucred->pid);
 526         if (!path)
 527                 goto finish;
 528
 529         /* example: /user/lennart/3/foobar
 530          *          /system/dbus.service/foobar
 531          *
 532          * So let's cut of everything past the third /, since that is
 533          * wher user directories start */
 534
 535         c = strchr(path, '/');
 536         if (c) {
 537                 c = strchr(c+1, '/');
 538                 if (c) {
 539                         c = strchr(c+1, '/');
 540                         if (c)
 541                                 *c = 0;
 542                 }
 543         }
 544
 545         rl = journal_rate_limit_test(s->rate_limit, path, priority, available_space(s));
 546
 547         if (rl == 0) {
 548                 free(path);
 549                 return;
 550         }
 551
 552         if (rl > 1) {
 553                 int j = 0;
 554                 char suppress_message[LINE_MAX];
 555                 struct iovec suppress_iovec[15];
 556
 557                 /* Write a suppression message if we suppressed something */
 558
 559                 snprintf(suppress_message, sizeof(suppress_message), "MESSAGE=Suppressed %u messages from %s", rl - 1, path);
 560                 char_array_0(suppress_message);
 561
 562                 IOVEC_SET_STRING(suppress_iovec[j++], "PRIORITY=5");
 563                 IOVEC_SET_STRING(suppress_iovec[j++], suppress_message);
 564
 565                 dispatch_message_real(s, suppress_iovec, j, ELEMENTSOF(suppress_iovec), NULL, NULL);
 566         }
 567
 568         free(path);
 569
 570 finish:
 571         dispatch_message_real(s, iovec, n, m, ucred, tv);
 572 }
 573
 574 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
 575         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL;
 576         struct iovec iovec[16];
 577         unsigned n = 0;
 578         int priority = LOG_USER | LOG_INFO;
 579
 580         assert(s);
 581         assert(buf);
 582
 583         parse_syslog_priority((char**) &buf, &priority);
 584         skip_syslog_date((char**) &buf);
 585
 586         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
 587                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 588
 589         if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
 590                 IOVEC_SET_STRING(iovec[n++], syslog_facility);
 591
 592         message = strappend("MESSAGE=", buf);
 593         if (message)
 594                 IOVEC_SET_STRING(iovec[n++], message);
 595
 596         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority & LOG_PRIMASK);
 597
 598         free(message);
 599         free(syslog_facility);
 600         free(syslog_priority);
 601 }
 602
 603 static bool valid_user_field(const char *p, size_t l) {
 604         const char *a;
 605
 606         /* We kinda enforce POSIX syntax recommendations for
 607            environment variables here, but make a couple of additional
 608            requirements.
 609
 610            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
 611
 612         /* No empty field names */
 613         if (l <= 0)
 614                 return false;
 615
 616         /* Don't allow names longer than 64 chars */
 617         if (l > 64)
 618                 return false;
 619
 620         /* Variables starting with an underscore are protected */
 621         if (p[0] == '_')
 622                 return false;
 623
 624         /* Don't allow digits as first character */
 625         if (p[0] >= '0' && p[0] <= '9')
 626                 return false;
 627
 628         /* Only allow A-Z0-9 and '_' */
 629         for (a = p; a < p + l; a++)
 630                 if (!((*a >= 'A' && *a <= 'Z') ||
 631                       (*a >= '0' && *a <= '9') ||
 632                       *a == '_'))
 633                         return false;
 634
 635         return true;
 636 }
 637
 638 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
 639         struct iovec *iovec = NULL;
 640         unsigned n = 0, m = 0, j;
 641         const char *p;
 642         size_t remaining;
 643         int priority = LOG_INFO;
 644
 645         assert(s);
 646         assert(buffer || n == 0);
 647
 648         p = buffer;
 649         remaining = buffer_size;
 650
 651         while (remaining > 0) {
 652                 const char *e, *q;
 653
 654                 e = memchr(p, '\n', remaining);
 655
 656                 if (!e) {
 657                         /* Trailing noise, let's ignore it, and flush what we collected */
 658                         log_debug("Received message with trailing noise, ignoring.");
 659                         break;
 660                 }
 661
 662                 if (e == p) {
 663                         /* Entry separator */
 664                         dispatch_message(s, iovec, n, m, ucred, tv, priority);
 665                         n = 0;
 666                         priority = LOG_INFO;
 667
 668                         p++;
 669                         remaining--;
 670                         continue;
 671                 }
 672
 673                 if (*p == '.' || *p == '#') {
 674                         /* Ignore control commands for now, and
 675                          * comments too. */
 676                         remaining -= (e - p) + 1;
 677                         p = e + 1;
 678                         continue;
 679                 }
 680
 681                 /* A property follows */
 682
 683                 if (n+13 >= m) {
 684                         struct iovec *c;
 685                         unsigned u;
 686
 687                         u = MAX((n+13U) * 2U, 4U);
 688                         c = realloc(iovec, u * sizeof(struct iovec));
 689                         if (!c) {
 690                                 log_error("Out of memory");
 691                                 break;
 692                         }
 693
 694                         iovec = c;
 695                         m = u;
 696                 }
 697
 698                 q = memchr(p, '=', e - p);
 699                 if (q) {
 700                         if (valid_user_field(p, q - p)) {
 701                                 /* If the field name starts with an
 702                                  * underscore, skip the variable,
 703                                  * since that indidates a trusted
 704                                  * field */
 705                                 iovec[n].iov_base = (char*) p;
 706                                 iovec[n].iov_len = e - p;
 707                                 n++;
 708
 709                                 /* We need to determine the priority
 710                                  * of this entry for the rate limiting
 711                                  * logic */
 712                                 if (e - p == 10 &&
 713                                     memcmp(p, "PRIORITY=", 10) == 0 &&
 714                                     p[10] >= '0' &&
 715                                     p[10] <= '9')
 716                                         priority = p[10] - '0';
 717                         }
 718
 719                         remaining -= (e - p) + 1;
 720                         p = e + 1;
 721                         continue;
 722                 } else {
 723                         uint64_t l;
 724                         char *k;
 725
 726                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
 727                                 log_debug("Failed to parse message, ignoring.");
 728                                 break;
 729                         }
 730
 731                         memcpy(&l, e + 1, sizeof(uint64_t));
 732                         l = le64toh(l);
 733
 734                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
 735                             e[1+sizeof(uint64_t)+l] != '\n') {
 736                                 log_debug("Failed to parse message, ignoring.");
 737                                 break;
 738                         }
 739
 740                         k = malloc((e - p) + 1 + l);
 741                         if (!k) {
 742                                 log_error("Out of memory");
 743                                 break;
 744                         }
 745
 746                         memcpy(k, p, e - p);
 747                         k[e - p] = '=';
 748                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
 749
 750                         if (valid_user_field(p, e - p)) {
 751                                 iovec[n].iov_base = k;
 752                                 iovec[n].iov_len = (e - p) + 1 + l;
 753                                 n++;
 754                         } else
 755                                 free(k);
 756
 757                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
 758                         p = e + 1 + sizeof(uint64_t) + l + 1;
 759                 }
 760         }
 761
 762         dispatch_message(s, iovec, n, m, ucred, tv, priority);
 763
 764         for (j = 0; j < n; j++)
 765                 if (iovec[j].iov_base < buffer ||
 766                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
 767                         free(iovec[j].iov_base);
 768 }
 769
 770 static int stdout_stream_log(StdoutStream *s, const char *p, size_t l) {
 771         struct iovec iovec[15];
 772         char *message = NULL, *syslog_priority = NULL;
 773         unsigned n = 0;
 774         size_t tag_len;
 775         int priority;
 776
 777         assert(s);
 778         assert(p);
 779
 780         priority = s->priority;
 781
 782         if (s->priority_prefix &&
 783             l > 3 &&
 784             p[0] == '<' &&
 785             p[1] >= '0' && p[1] <= '7' &&
 786             p[2] == '>') {
 787
 788                 priority = p[1] - '0';
 789                 p += 3;
 790                 l -= 3;
 791         }
 792
 793         if (l <= 0)
 794                 return 0;
 795
 796         if (asprintf(&syslog_priority, "PRIORITY=%i", priority) >= 0)
 797                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 798
 799         tag_len = s->tag ? strlen(s->tag) + 2: 0;
 800         message = malloc(8 + tag_len + l);
 801         if (message) {
 802                 memcpy(message, "MESSAGE=", 8);
 803
 804                 if (s->tag) {
 805                         memcpy(message+8, s->tag, tag_len-2);
 806                         memcpy(message+8+tag_len-2, ": ", 2);
 807                 }
 808
 809                 memcpy(message+8+tag_len, p, l);
 810                 iovec[n].iov_base = message;
 811                 iovec[n].iov_len = 8+tag_len+l;
 812                 n++;
 813         }
 814
 815         dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
 816
 817         if (s->tee_console) {
 818                 int console;
 819
 820                 console = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 821                 if (console >= 0) {
 822                         n = 0;
 823                         if (s->tag) {
 824                                 IOVEC_SET_STRING(iovec[n++], s->tag);
 825                                 IOVEC_SET_STRING(iovec[n++], ": ");
 826                         }
 827
 828                         iovec[n].iov_base = (void*) p;
 829                         iovec[n].iov_len = l;
 830                         n++;
 831
 832                         IOVEC_SET_STRING(iovec[n++], (char*) "\n");
 833
 834                         writev(console, iovec, n);
 835                 }
 836         }
 837
 838         free(message);
 839         free(syslog_priority);
 840
 841         return 0;
 842 }
 843
 844 static int stdout_stream_line(StdoutStream *s, const char *p, size_t l) {
 845         assert(s);
 846         assert(p);
 847
 848         while (l > 0 && strchr(WHITESPACE, *p)) {
 849                 l--;
 850                 p++;
 851         }
 852
 853         while (l > 0 && strchr(WHITESPACE, *(p+l-1)))
 854                 l--;
 855
 856         switch (s->state) {
 857
 858         case STDOUT_STREAM_TAG:
 859
 860                 if (l > 0) {
 861                         s->tag = strndup(p, l);
 862                         if (!s->tag) {
 863                                 log_error("Out of memory");
 864                                 return -EINVAL;
 865                         }
 866                 }
 867
 868                 s->state = STDOUT_STREAM_PRIORITY;
 869                 return 0;
 870
 871         case STDOUT_STREAM_PRIORITY:
 872                 if (l != 1 || *p < '0' || *p > '7') {
 873                         log_warning("Failed to parse log priority line.");
 874                         return -EINVAL;
 875                 }
 876
 877                 s->priority = *p - '0';
 878                 s->state = STDOUT_STREAM_PRIORITY_PREFIX;
 879                 return 0;
 880
 881         case STDOUT_STREAM_PRIORITY_PREFIX:
 882                 if (l != 1 || *p < '0' || *p > '1') {
 883                         log_warning("Failed to parse priority prefix line.");
 884                         return -EINVAL;
 885                 }
 886
 887                 s->priority_prefix = *p - '0';
 888                 s->state = STDOUT_STREAM_TEE_CONSOLE;
 889                 return 0;
 890
 891         case STDOUT_STREAM_TEE_CONSOLE:
 892                 if (l != 1 || *p < '0' || *p > '1') {
 893                         log_warning("Failed to parse tee to console line.");
 894                         return -EINVAL;
 895                 }
 896
 897                 s->tee_console = *p - '0';
 898                 s->state = STDOUT_STREAM_RUNNING;
 899                 return 0;
 900
 901         case STDOUT_STREAM_RUNNING:
 902                 return stdout_stream_log(s, p, l);
 903         }
 904
 905         assert_not_reached("Unknown stream state");
 906 }
 907
 908 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 909         char *p;
 910         size_t remaining;
 911         int r;
 912
 913         assert(s);
 914
 915         p = s->buffer;
 916         remaining = s->length;
 917         for (;;) {
 918                 char *end;
 919                 size_t skip;
 920
 921                 end = memchr(p, '\n', remaining);
 922                 if (!end) {
 923                         if (remaining >= LINE_MAX) {
 924                                 end = p + LINE_MAX;
 925                                 skip = LINE_MAX;
 926                         } else
 927                                 break;
 928                 } else
 929                         skip = end - p + 1;
 930
 931                 r = stdout_stream_line(s, p, end - p);
 932                 if (r < 0)
 933                         return r;
 934
 935                 remaining -= skip;
 936                 p += skip;
 937         }
 938
 939         if (force_flush && remaining > 0) {
 940                 r = stdout_stream_line(s, p, remaining);
 941                 if (r < 0)
 942                         return r;
 943
 944                 p += remaining;
 945                 remaining = 0;
 946         }
 947
 948         if (p > s->buffer) {
 949                 memmove(s->buffer, p, remaining);
 950                 s->length = remaining;
 951         }
 952
 953         return 0;
 954 }
 955
 956 static int stdout_stream_process(StdoutStream *s) {
 957         ssize_t l;
 958         int r;
 959
 960         assert(s);
 961
 962         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
 963         if (l < 0) {
 964
 965                 if (errno == EAGAIN)
 966                         return 0;
 967
 968                 log_warning("Failed to read from stream: %m");
 969                 return -errno;
 970         }
 971
 972         if (l == 0) {
 973                 r = stdout_stream_scan(s, true);
 974                 if (r < 0)
 975                         return r;
 976
 977                 return 0;
 978         }
 979
 980         s->length += l;
 981         r = stdout_stream_scan(s, false);
 982         if (r < 0)
 983                 return r;
 984
 985         return 1;
 986
 987 }
 988
 989 static void stdout_stream_free(StdoutStream *s) {
 990         assert(s);
 991
 992         if (s->server) {
 993                 assert(s->server->n_stdout_streams > 0);
 994                 s->server->n_stdout_streams --;
 995                 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
 996         }
 997
 998         if (s->fd >= 0) {
 999                 if (s->server)
1000                         epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1001
1002                 close_nointr_nofail(s->fd);
1003         }
1004
1005         free(s->tag);
1006         free(s);
1007 }
1008
1009 static int stdout_stream_new(Server *s) {
1010         StdoutStream *stream;
1011         int fd, r;
1012         socklen_t len;
1013         struct epoll_event ev;
1014
1015         assert(s);
1016
1017         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1018         if (fd < 0) {
1019                 if (errno == EAGAIN)
1020                         return 0;
1021
1022                 log_error("Failed to accept stdout connection: %m");
1023                 return -errno;
1024         }
1025
1026         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1027                 log_warning("Too many stdout streams, refusing connection.");
1028                 close_nointr_nofail(fd);
1029                 return 0;
1030         }
1031
1032         stream = new0(StdoutStream, 1);
1033         if (!stream) {
1034                 log_error("Out of memory.");
1035                 close_nointr_nofail(fd);
1036                 return -ENOMEM;
1037         }
1038
1039         stream->fd = fd;
1040
1041         len = sizeof(stream->ucred);
1042         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1043                 log_error("Failed to determine peer credentials: %m");
1044                 r = -errno;
1045                 goto fail;
1046         }
1047
1048         if (shutdown(fd, SHUT_WR) < 0) {
1049                 log_error("Failed to shutdown writing side of socket: %m");
1050                 r = -errno;
1051                 goto fail;
1052         }
1053
1054         zero(ev);
1055         ev.data.ptr = stream;
1056         ev.events = EPOLLIN;
1057         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1058                 log_error("Failed to add stream to event loop: %m");
1059                 r = -errno;
1060                 goto fail;
1061         }
1062
1063         stream->server = s;
1064         LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1065         s->n_stdout_streams ++;
1066
1067         return 0;
1068
1069 fail:
1070         stdout_stream_free(stream);
1071         return r;
1072 }
1073
1074 static int process_event(Server *s, struct epoll_event *ev) {
1075         assert(s);
1076
1077         if (ev->data.fd == s->signal_fd) {
1078                 struct signalfd_siginfo sfsi;
1079                 ssize_t n;
1080
1081                 if (ev->events != EPOLLIN) {
1082                         log_info("Got invalid event from epoll.");
1083                         return -EIO;
1084                 }
1085
1086                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
1087                 if (n != sizeof(sfsi)) {
1088
1089                         if (n >= 0)
1090                                 return -EIO;
1091
1092                         if (errno == EINTR || errno == EAGAIN)
1093                                 return 0;
1094
1095                         return -errno;
1096                 }
1097
1098                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1099                 return 0;
1100
1101         } else if (ev->data.fd == s->native_fd ||
1102                    ev->data.fd == s->syslog_fd) {
1103
1104                 if (ev->events != EPOLLIN) {
1105                         log_info("Got invalid event from epoll.");
1106                         return -EIO;
1107                 }
1108
1109                 for (;;) {
1110                         struct msghdr msghdr;
1111                         struct iovec iovec;
1112                         struct ucred *ucred = NULL;
1113                         struct timeval *tv = NULL;
1114                         struct cmsghdr *cmsg;
1115                         union {
1116                                 struct cmsghdr cmsghdr;
1117                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1118                                             CMSG_SPACE(sizeof(struct timeval))];
1119                         } control;
1120                         ssize_t n;
1121                         int v;
1122
1123                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
1124                                 log_error("SIOCINQ failed: %m");
1125                                 return -errno;
1126                         }
1127
1128                         if (v <= 0)
1129                                 return 1;
1130
1131                         if (s->buffer_size < (size_t) v) {
1132                                 void *b;
1133                                 size_t l;
1134
1135                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
1136                                 b = realloc(s->buffer, l+1);
1137
1138                                 if (!b) {
1139                                         log_error("Couldn't increase buffer.");
1140                                         return -ENOMEM;
1141                                 }
1142
1143                                 s->buffer_size = l;
1144                                 s->buffer = b;
1145                         }
1146
1147                         zero(iovec);
1148                         iovec.iov_base = s->buffer;
1149                         iovec.iov_len = s->buffer_size;
1150
1151                         zero(control);
1152                         zero(msghdr);
1153                         msghdr.msg_iov = &iovec;
1154                         msghdr.msg_iovlen = 1;
1155                         msghdr.msg_control = &control;
1156                         msghdr.msg_controllen = sizeof(control);
1157
1158                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
1159                         if (n < 0) {
1160
1161                                 if (errno == EINTR || errno == EAGAIN)
1162                                         return 1;
1163
1164                                 log_error("recvmsg() failed: %m");
1165                                 return -errno;
1166                         }
1167
1168                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
1169
1170                                 if (cmsg->cmsg_level == SOL_SOCKET &&
1171                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
1172                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
1173                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
1174                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
1175                                          cmsg->cmsg_type == SO_TIMESTAMP &&
1176                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
1177                                         tv = (struct timeval*) CMSG_DATA(cmsg);
1178                         }
1179
1180                         if (ev->data.fd == s->syslog_fd) {
1181                                 char *e;
1182
1183                                 e = memchr(s->buffer, '\n', n);
1184                                 if (e)
1185                                         *e = 0;
1186                                 else
1187                                         s->buffer[n] = 0;
1188
1189                                 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
1190                         } else
1191                                 process_native_message(s, s->buffer, n, ucred, tv);
1192                 }
1193
1194                 return 1;
1195
1196         } else if (ev->data.fd == s->stdout_fd) {
1197
1198                 if (ev->events != EPOLLIN) {
1199                         log_info("Got invalid event from epoll.");
1200                         return -EIO;
1201                 }
1202
1203                 stdout_stream_new(s);
1204                 return 1;
1205
1206         } else {
1207                 StdoutStream *stream;
1208
1209                 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
1210                         log_info("Got invalid event from epoll.");
1211                         return -EIO;
1212                 }
1213
1214                 /* If it is none of the well-known fds, it must be an
1215                  * stdout stream fd. Note that this is a bit ugly here
1216                  * (since we rely that none of the well-known fds
1217                  * could be interpreted as pointer), but nonetheless
1218                  * safe, since the well-known fds would never get an
1219                  * fd > 4096, i.e. beyond the first memory page */
1220
1221                 stream = ev->data.ptr;
1222
1223                 if (stdout_stream_process(stream) <= 0)
1224                         stdout_stream_free(stream);
1225
1226                 return 1;
1227         }
1228
1229         log_error("Unknown event.");
1230         return 0;
1231 }
1232
1233 static int system_journal_open(Server *s) {
1234         int r;
1235         char *fn;
1236         sd_id128_t machine;
1237         char ids[33];
1238
1239         r = sd_id128_get_machine(&machine);
1240         if (r < 0)
1241                 return r;
1242
1243         /* First try to create the machine path, but not the prefix */
1244         fn = strappend("/var/log/journal/", sd_id128_to_string(machine, ids));
1245         if (!fn)
1246                 return -ENOMEM;
1247         (void) mkdir(fn, 0755);
1248         free(fn);
1249
1250         /* The create the system journal file */
1251         fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1252         if (!fn)
1253                 return -ENOMEM;
1254
1255         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1256         free(fn);
1257
1258         if (r >= 0) {
1259                 s->system_journal->metrics = s->metrics;
1260                 s->system_journal->compress = s->compress;
1261
1262                 fix_perms(s->system_journal, 0);
1263                 return r;
1264         }
1265
1266         if (r < 0 && r != -ENOENT) {
1267                 log_error("Failed to open system journal: %s", strerror(-r));
1268                 return r;
1269         }
1270
1271         /* /var didn't work, so try /run, but this time we
1272          * create the prefix too */
1273         fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1274         if (!fn)
1275                 return -ENOMEM;
1276
1277         (void) mkdir_parents(fn, 0755);
1278         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1279         free(fn);
1280
1281         if (r < 0) {
1282                 log_error("Failed to open runtime journal: %s", strerror(-r));
1283                 return r;
1284         }
1285
1286         s->runtime_journal->metrics = s->metrics;
1287         s->runtime_journal->compress = s->compress;
1288
1289         fix_perms(s->runtime_journal, 0);
1290         return r;
1291 }
1292
1293 static int open_syslog_socket(Server *s) {
1294         union sockaddr_union sa;
1295         int one, r;
1296         struct epoll_event ev;
1297
1298         assert(s);
1299
1300         if (s->syslog_fd < 0) {
1301
1302                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1303                 if (s->syslog_fd < 0) {
1304                         log_error("socket() failed: %m");
1305                         return -errno;
1306                 }
1307
1308                 zero(sa);
1309                 sa.un.sun_family = AF_UNIX;
1310                 strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));
1311
1312                 unlink(sa.un.sun_path);
1313
1314                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1315                 if (r < 0) {
1316                         log_error("bind() failed: %m");
1317                         return -errno;
1318                 }
1319
1320                 chmod(sa.un.sun_path, 0666);
1321         }
1322
1323         one = 1;
1324         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1325         if (r < 0) {
1326                 log_error("SO_PASSCRED failed: %m");
1327                 return -errno;
1328         }
1329
1330         one = 1;
1331         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1332         if (r < 0) {
1333                 log_error("SO_TIMESTAMP failed: %m");
1334                 return -errno;
1335         }
1336
1337         zero(ev);
1338         ev.events = EPOLLIN;
1339         ev.data.fd = s->syslog_fd;
1340         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
1341                 log_error("Failed to add syslog server fd to epoll object: %m");
1342                 return -errno;
1343         }
1344
1345         return 0;
1346 }
1347
1348 static int open_native_socket(Server*s) {
1349         union sockaddr_union sa;
1350         int one, r;
1351         struct epoll_event ev;
1352
1353         assert(s);
1354
1355         if (s->native_fd < 0) {
1356
1357                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
1358                 if (s->native_fd < 0) {
1359                         log_error("socket() failed: %m");
1360                         return -errno;
1361                 }
1362
1363                 zero(sa);
1364                 sa.un.sun_family = AF_UNIX;
1365                 strncpy(sa.un.sun_path, "/run/systemd/journal", sizeof(sa.un.sun_path));
1366
1367                 unlink(sa.un.sun_path);
1368
1369                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1370                 if (r < 0) {
1371                         log_error("bind() failed: %m");
1372                         return -errno;
1373                 }
1374
1375                 chmod(sa.un.sun_path, 0666);
1376         }
1377
1378         one = 1;
1379         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
1380         if (r < 0) {
1381                 log_error("SO_PASSCRED failed: %m");
1382                 return -errno;
1383         }
1384
1385         one = 1;
1386         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
1387         if (r < 0) {
1388                 log_error("SO_TIMESTAMP failed: %m");
1389                 return -errno;
1390         }
1391
1392         zero(ev);
1393         ev.events = EPOLLIN;
1394         ev.data.fd = s->native_fd;
1395         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
1396                 log_error("Failed to add native server fd to epoll object: %m");
1397                 return -errno;
1398         }
1399
1400         return 0;
1401 }
1402
1403 static int open_stdout_socket(Server *s) {
1404         union sockaddr_union sa;
1405         int r;
1406         struct epoll_event ev;
1407
1408         assert(s);
1409
1410         if (s->stdout_fd < 0) {
1411
1412                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
1413                 if (s->stdout_fd < 0) {
1414                         log_error("socket() failed: %m");
1415                         return -errno;
1416                 }
1417
1418                 zero(sa);
1419                 sa.un.sun_family = AF_UNIX;
1420                 strncpy(sa.un.sun_path, "/run/systemd/stdout", sizeof(sa.un.sun_path));
1421
1422                 unlink(sa.un.sun_path);
1423
1424                 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
1425                 if (r < 0) {
1426                         log_error("bind() failed: %m");
1427                         return -errno;
1428                 }
1429
1430                 chmod(sa.un.sun_path, 0666);
1431
1432                 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
1433                         log_error("liste() failed: %m");
1434                         return -errno;
1435                 }
1436         }
1437
1438         zero(ev);
1439         ev.events = EPOLLIN;
1440         ev.data.fd = s->stdout_fd;
1441         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
1442                 log_error("Failed to add stdout server fd to epoll object: %m");
1443                 return -errno;
1444         }
1445
1446         return 0;
1447 }
1448
1449 static int open_signalfd(Server *s) {
1450         sigset_t mask;
1451         struct epoll_event ev;
1452
1453         assert(s);
1454
1455         assert_se(sigemptyset(&mask) == 0);
1456         sigset_add_many(&mask, SIGINT, SIGTERM, -1);
1457         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
1458
1459         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1460         if (s->signal_fd < 0) {
1461                 log_error("signalfd(): %m");
1462                 return -errno;
1463         }
1464
1465         zero(ev);
1466         ev.events = EPOLLIN;
1467         ev.data.fd = s->signal_fd;
1468
1469         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
1470                 log_error("epoll_ctl(): %m");
1471                 return -errno;
1472         }
1473
1474         return 0;
1475 }
1476
1477 static int server_init(Server *s) {
1478         int n, r, fd;
1479
1480         assert(s);
1481
1482         zero(*s);
1483         s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = -1;
1484         s->metrics.max_size = DEFAULT_MAX_SIZE;
1485         s->metrics.min_size = DEFAULT_MIN_SIZE;
1486         s->metrics.keep_free = DEFAULT_KEEP_FREE;
1487         s->max_use = DEFAULT_MAX_USE;
1488         s->compress = true;
1489
1490         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
1491         if (!s->user_journals) {
1492                 log_error("Out of memory.");
1493                 return -ENOMEM;
1494         }
1495
1496         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1497         if (s->epoll_fd < 0) {
1498                 log_error("Failed to create epoll object: %m");
1499                 return -errno;
1500         }
1501
1502         n = sd_listen_fds(true);
1503         if (n < 0) {
1504                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
1505                 return n;
1506         }
1507
1508         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
1509
1510                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/native", 0) > 0) {
1511
1512                         if (s->native_fd >= 0) {
1513                                 log_error("Too many native sockets passed.");
1514                                 return -EINVAL;
1515                         }
1516
1517                         s->native_fd = fd;
1518
1519                 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/stdout", 0) > 0) {
1520
1521                         if (s->stdout_fd >= 0) {
1522                                 log_error("Too many stdout sockets passed.");
1523                                 return -EINVAL;
1524                         }
1525
1526                         s->stdout_fd = fd;
1527
1528                 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
1529
1530                         if (s->syslog_fd >= 0) {
1531                                 log_error("Too many /dev/log sockets passed.");
1532                                 return -EINVAL;
1533                         }
1534
1535                         s->syslog_fd = fd;
1536
1537                 } else {
1538                         log_error("Unknown socket passed.");
1539                         return -EINVAL;
1540                 }
1541         }
1542
1543         r = open_syslog_socket(s);
1544         if (r < 0)
1545                 return r;
1546
1547         r = open_native_socket(s);
1548         if (r < 0)
1549                 return r;
1550
1551         r = open_stdout_socket(s);
1552         if (r < 0)
1553                 return r;
1554
1555         r = system_journal_open(s);
1556         if (r < 0)
1557                 return r;
1558
1559         r = open_signalfd(s);
1560         if (r < 0)
1561                 return r;
1562
1563         s->rate_limit = journal_rate_limit_new(10*USEC_PER_SEC, 2);
1564         if (!s->rate_limit)
1565                 return -ENOMEM;
1566
1567         return 0;
1568 }
1569
1570 static void server_done(Server *s) {
1571         JournalFile *f;
1572         assert(s);
1573
1574         while (s->stdout_streams)
1575                 stdout_stream_free(s->stdout_streams);
1576
1577         if (s->system_journal)
1578                 journal_file_close(s->system_journal);
1579
1580         if (s->runtime_journal)
1581                 journal_file_close(s->runtime_journal);
1582
1583         while ((f = hashmap_steal_first(s->user_journals)))
1584                 journal_file_close(f);
1585
1586         hashmap_free(s->user_journals);
1587
1588         if (s->epoll_fd >= 0)
1589                 close_nointr_nofail(s->epoll_fd);
1590
1591         if (s->signal_fd >= 0)
1592                 close_nointr_nofail(s->signal_fd);
1593
1594         if (s->syslog_fd >= 0)
1595                 close_nointr_nofail(s->syslog_fd);
1596
1597         if (s->native_fd >= 0)
1598                 close_nointr_nofail(s->native_fd);
1599
1600         if (s->stdout_fd >= 0)
1601                 close_nointr_nofail(s->stdout_fd);
1602
1603         if (s->rate_limit)
1604                 journal_rate_limit_free(s->rate_limit);
1605 }
1606
1607 int main(int argc, char *argv[]) {
1608         Server server;
1609         int r;
1610
1611         /* if (getppid() != 1) { */
1612         /*         log_error("This program should be invoked by init only."); */
1613         /*         return EXIT_FAILURE; */
1614         /* } */
1615
1616         if (argc > 1) {
1617                 log_error("This program does not take arguments.");
1618                 return EXIT_FAILURE;
1619         }
1620
1621         log_set_target(LOG_TARGET_CONSOLE);
1622         log_set_max_level(LOG_DEBUG);
1623         log_parse_environment();
1624         log_open();
1625
1626         umask(0022);
1627
1628         r = server_init(&server);
1629         if (r < 0)
1630                 goto finish;
1631
1632         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
1633
1634         sd_notify(false,
1635                   "READY=1\n"
1636                   "STATUS=Processing requests...");
1637
1638         for (;;) {
1639                 struct epoll_event event;
1640
1641                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
1642                 if (r < 0) {
1643
1644                         if (errno == EINTR)
1645                                 continue;
1646
1647                         log_error("epoll_wait() failed: %m");
1648                         r = -errno;
1649                         goto finish;
1650                 } else if (r == 0)
1651                         break;
1652
1653                 r = process_event(&server, &event);
1654                 if (r < 0)
1655                         goto finish;
1656                 else if (r == 0)
1657                         break;
1658         }
1659
1660         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
1661
1662 finish:
1663         sd_notify(false,
1664                   "STATUS=Shutting down...");
1665
1666         server_done(&server);
1667
1668         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1669 }