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 <stddef.h>
  29 #include <sys/ioctl.h>
  30 #include <linux/sockios.h>
  31 #include <sys/statvfs.h>
  32
  33 #include <systemd/sd-journal.h>
  34 #include <systemd/sd-login.h>
  35 #include <systemd/sd-messages.h>
  36 #include <systemd/sd-daemon.h>
  37
  38 #include "hashmap.h"
  39 #include "journal-file.h"
  40 #include "socket-util.h"
  41 #include "cgroup-util.h"
  42 #include "list.h"
  43 #include "journal-rate-limit.h"
  44 #include "journal-internal.h"
  45 #include "conf-parser.h"
  46 #include "journald.h"
  47 #include "virt.h"
  48
  49 #ifdef HAVE_ACL
  50 #include <sys/acl.h>
  51 #include <acl/libacl.h>
  52 #include "acl-util.h"
  53 #endif
  54
  55 #ifdef HAVE_SELINUX
  56 #include <selinux/selinux.h>
  57 #endif
  58
  59 #define USER_JOURNALS_MAX 1024
  60 #define STDOUT_STREAMS_MAX 4096
  61
  62 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
  63 #define DEFAULT_RATE_LIMIT_BURST 200
  64
  65 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
  66
  67 #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)
  68
  69 #define SYSLOG_TIMEOUT_USEC (250*USEC_PER_MSEC)
  70
  71 #define N_IOVEC_META_FIELDS 17
  72
  73 typedef enum StdoutStreamState {
  74         STDOUT_STREAM_IDENTIFIER,
  75         STDOUT_STREAM_PRIORITY,
  76         STDOUT_STREAM_LEVEL_PREFIX,
  77         STDOUT_STREAM_FORWARD_TO_SYSLOG,
  78         STDOUT_STREAM_FORWARD_TO_KMSG,
  79         STDOUT_STREAM_FORWARD_TO_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 *identifier;
  92         int priority;
  93         bool level_prefix:1;
  94         bool forward_to_syslog:1;
  95         bool forward_to_kmsg:1;
  96         bool forward_to_console:1;
  97
  98         char buffer[LINE_MAX+1];
  99         size_t length;
 100
 101         LIST_FIELDS(StdoutStream, stdout_stream);
 102 };
 103
 104 static int server_flush_to_var(Server *s);
 105
 106 static uint64_t available_space(Server *s) {
 107         char ids[33], *p;
 108         const char *f;
 109         sd_id128_t machine;
 110         struct statvfs ss;
 111         uint64_t sum = 0, avail = 0, ss_avail = 0;
 112         int r;
 113         DIR *d;
 114         usec_t ts;
 115         JournalMetrics *m;
 116
 117         ts = now(CLOCK_MONOTONIC);
 118
 119         if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
 120                 return s->cached_available_space;
 121
 122         r = sd_id128_get_machine(&machine);
 123         if (r < 0)
 124                 return 0;
 125
 126         if (s->system_journal) {
 127                 f = "/var/log/journal/";
 128                 m = &s->system_metrics;
 129         } else {
 130                 f = "/run/log/journal/";
 131                 m = &s->runtime_metrics;
 132         }
 133
 134         assert(m);
 135
 136         p = strappend(f, sd_id128_to_string(machine, ids));
 137         if (!p)
 138                 return 0;
 139
 140         d = opendir(p);
 141         free(p);
 142
 143         if (!d)
 144                 return 0;
 145
 146         if (fstatvfs(dirfd(d), &ss) < 0)
 147                 goto finish;
 148
 149         for (;;) {
 150                 struct stat st;
 151                 struct dirent buf, *de;
 152                 int k;
 153
 154                 k = readdir_r(d, &buf, &de);
 155                 if (k != 0) {
 156                         r = -k;
 157                         goto finish;
 158                 }
 159
 160                 if (!de)
 161                         break;
 162
 163                 if (!dirent_is_file_with_suffix(de, ".journal"))
 164                         continue;
 165
 166                 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
 167                         continue;
 168
 169                 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
 170         }
 171
 172         avail = sum >= m->max_use ? 0 : m->max_use - sum;
 173
 174         ss_avail = ss.f_bsize * ss.f_bavail;
 175
 176         ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
 177
 178         if (ss_avail < avail)
 179                 avail = ss_avail;
 180
 181         s->cached_available_space = avail;
 182         s->cached_available_space_timestamp = ts;
 183
 184 finish:
 185         closedir(d);
 186
 187         return avail;
 188 }
 189
 190 static void server_read_file_gid(Server *s) {
 191         const char *adm = "adm";
 192         int r;
 193
 194         assert(s);
 195
 196         if (s->file_gid_valid)
 197                 return;
 198
 199         r = get_group_creds(&adm, &s->file_gid);
 200         if (r < 0)
 201                 log_warning("Failed to resolve 'adm' group: %s", strerror(-r));
 202
 203         /* if we couldn't read the gid, then it will be 0, but that's
 204          * fine and we shouldn't try to resolve the group again, so
 205          * let's just pretend it worked right-away. */
 206         s->file_gid_valid = true;
 207 }
 208
 209 static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
 210         int r;
 211 #ifdef HAVE_ACL
 212         acl_t acl;
 213         acl_entry_t entry;
 214         acl_permset_t permset;
 215 #endif
 216
 217         assert(f);
 218
 219         server_read_file_gid(s);
 220
 221         r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
 222         if (r < 0)
 223                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
 224
 225 #ifdef HAVE_ACL
 226         if (uid <= 0)
 227                 return;
 228
 229         acl = acl_get_fd(f->fd);
 230         if (!acl) {
 231                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
 232                 return;
 233         }
 234
 235         r = acl_find_uid(acl, uid, &entry);
 236         if (r <= 0) {
 237
 238                 if (acl_create_entry(&acl, &entry) < 0 ||
 239                     acl_set_tag_type(entry, ACL_USER) < 0 ||
 240                     acl_set_qualifier(entry, &uid) < 0) {
 241                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 242                         goto finish;
 243                 }
 244         }
 245
 246         if (acl_get_permset(entry, &permset) < 0 ||
 247             acl_add_perm(permset, ACL_READ) < 0 ||
 248             acl_calc_mask(&acl) < 0) {
 249                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 250                 goto finish;
 251         }
 252
 253         if (acl_set_fd(f->fd, acl) < 0)
 254                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
 255
 256 finish:
 257         acl_free(acl);
 258 #endif
 259 }
 260
 261 static JournalFile* find_journal(Server *s, uid_t uid) {
 262         char *p;
 263         int r;
 264         JournalFile *f;
 265         char ids[33];
 266         sd_id128_t machine;
 267
 268         assert(s);
 269
 270         /* We split up user logs only on /var, not on /run. If the
 271          * runtime file is open, we write to it exclusively, in order
 272          * to guarantee proper order as soon as we flush /run to
 273          * /var and close the runtime file. */
 274
 275         if (s->runtime_journal)
 276                 return s->runtime_journal;
 277
 278         if (uid <= 0)
 279                 return s->system_journal;
 280
 281         r = sd_id128_get_machine(&machine);
 282         if (r < 0)
 283                 return s->system_journal;
 284
 285         f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
 286         if (f)
 287                 return f;
 288
 289         if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
 290                 return s->system_journal;
 291
 292         while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
 293                 /* Too many open? Then let's close one */
 294                 f = hashmap_steal_first(s->user_journals);
 295                 assert(f);
 296                 journal_file_close(f);
 297         }
 298
 299         r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
 300         free(p);
 301
 302         if (r < 0)
 303                 return s->system_journal;
 304
 305         server_fix_perms(s, f, uid);
 306         f->metrics = s->system_metrics;
 307         f->compress = s->compress;
 308
 309         r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
 310         if (r < 0) {
 311                 journal_file_close(f);
 312                 return s->system_journal;
 313         }
 314
 315         return f;
 316 }
 317
 318 static void server_rotate(Server *s) {
 319         JournalFile *f;
 320         void *k;
 321         Iterator i;
 322         int r;
 323
 324         log_info("Rotating...");
 325
 326         if (s->runtime_journal) {
 327                 r = journal_file_rotate(&s->runtime_journal);
 328                 if (r < 0)
 329                         log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
 330         }
 331
 332         if (s->system_journal) {
 333                 r = journal_file_rotate(&s->system_journal);
 334                 if (r < 0)
 335                         log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
 336         }
 337
 338         HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
 339                 r = journal_file_rotate(&f);
 340                 if (r < 0)
 341                         log_error("Failed to rotate %s: %s", f->path, strerror(-r));
 342                 else
 343                         hashmap_replace(s->user_journals, k, f);
 344         }
 345 }
 346
 347 static void server_vacuum(Server *s) {
 348         char *p;
 349         char ids[33];
 350         sd_id128_t machine;
 351         int r;
 352
 353         log_info("Vacuuming...");
 354
 355         r = sd_id128_get_machine(&machine);
 356         if (r < 0) {
 357                 log_error("Failed to get machine ID: %s", strerror(-r));
 358                 return;
 359         }
 360
 361         sd_id128_to_string(machine, ids);
 362
 363         if (s->system_journal) {
 364                 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
 365                         log_error("Out of memory.");
 366                         return;
 367                 }
 368
 369                 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
 370                 if (r < 0 && r != -ENOENT)
 371                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
 372                 free(p);
 373         }
 374
 375
 376         if (s->runtime_journal) {
 377                 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
 378                         log_error("Out of memory.");
 379                         return;
 380                 }
 381
 382                 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
 383                 if (r < 0 && r != -ENOENT)
 384                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
 385                 free(p);
 386         }
 387
 388         s->cached_available_space_timestamp = 0;
 389 }
 390
 391 static char *shortened_cgroup_path(pid_t pid) {
 392         int r;
 393         char *process_path, *init_path, *path;
 394
 395         assert(pid > 0);
 396
 397         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
 398         if (r < 0)
 399                 return NULL;
 400
 401         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
 402         if (r < 0) {
 403                 free(process_path);
 404                 return NULL;
 405         }
 406
 407         if (endswith(init_path, "/system"))
 408                 init_path[strlen(init_path) - 7] = 0;
 409         else if (streq(init_path, "/"))
 410                 init_path[0] = 0;
 411
 412         if (startswith(process_path, init_path)) {
 413                 char *p;
 414
 415                 p = strdup(process_path + strlen(init_path));
 416                 if (!p) {
 417                         free(process_path);
 418                         free(init_path);
 419                         return NULL;
 420                 }
 421                 path = p;
 422         } else {
 423                 path = process_path;
 424                 process_path = NULL;
 425         }
 426
 427         free(process_path);
 428         free(init_path);
 429
 430         return path;
 431 }
 432
 433 static void dispatch_message_real(Server *s,
 434                              struct iovec *iovec, unsigned n, unsigned m,
 435                              struct ucred *ucred,
 436                              struct timeval *tv) {
 437
 438         char *pid = NULL, *uid = NULL, *gid = NULL,
 439                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 440                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 441                 *audit_session = NULL, *audit_loginuid = NULL,
 442                 *exe = NULL, *cgroup = NULL, *session = NULL,
 443                 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
 444
 445         char idbuf[33];
 446         sd_id128_t id;
 447         int r;
 448         char *t;
 449         uid_t loginuid = 0, realuid = 0;
 450         JournalFile *f;
 451         bool vacuumed = false;
 452
 453         assert(s);
 454         assert(iovec);
 455         assert(n > 0);
 456         assert(n + N_IOVEC_META_FIELDS <= m);
 457
 458         if (ucred) {
 459                 uint32_t audit;
 460                 uid_t owner;
 461 #ifdef HAVE_SELINUX
 462                 security_context_t con;
 463 #endif
 464
 465                 realuid = ucred->uid;
 466
 467                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 468                         IOVEC_SET_STRING(iovec[n++], pid);
 469
 470                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 471                         IOVEC_SET_STRING(iovec[n++], uid);
 472
 473                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 474                         IOVEC_SET_STRING(iovec[n++], gid);
 475
 476                 r = get_process_comm(ucred->pid, &t);
 477                 if (r >= 0) {
 478                         comm = strappend("_COMM=", t);
 479                         free(t);
 480
 481                         if (comm)
 482                                 IOVEC_SET_STRING(iovec[n++], comm);
 483                 }
 484
 485                 r = get_process_exe(ucred->pid, &t);
 486                 if (r >= 0) {
 487                         exe = strappend("_EXE=", t);
 488                         free(t);
 489
 490                         if (comm)
 491                                 IOVEC_SET_STRING(iovec[n++], exe);
 492                 }
 493
 494                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 495                 if (r >= 0) {
 496                         cmdline = strappend("_CMDLINE=", t);
 497                         free(t);
 498
 499                         if (cmdline)
 500                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 501                 }
 502
 503                 r = audit_session_from_pid(ucred->pid, &audit);
 504                 if (r >= 0)
 505                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
 506                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 507
 508                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 509                 if (r >= 0)
 510                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 511                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 512
 513                 t = shortened_cgroup_path(ucred->pid);
 514                 if (t) {
 515                         cgroup = strappend("_SYSTEMD_CGROUP=", t);
 516                         free(t);
 517
 518                         if (cgroup)
 519                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 520                 }
 521
 522                 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
 523                         session = strappend("_SYSTEMD_SESSION=", t);
 524                         free(t);
 525
 526                         if (session)
 527                                 IOVEC_SET_STRING(iovec[n++], session);
 528                 }
 529
 530                 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
 531                         unit = strappend("_SYSTEMD_UNIT=", t);
 532                         free(t);
 533
 534                         if (unit)
 535                                 IOVEC_SET_STRING(iovec[n++], unit);
 536                 }
 537
 538                 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
 539                         if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
 540                                 IOVEC_SET_STRING(iovec[n++], owner_uid);
 541
 542 #ifdef HAVE_SELINUX
 543                 if (getpidcon(ucred->pid, &con) >= 0) {
 544                         selinux_context = strappend("_SELINUX_CONTEXT=", con);
 545                         if (selinux_context)
 546                                 IOVEC_SET_STRING(iovec[n++], selinux_context);
 547
 548                         freecon(con);
 549                 }
 550 #endif
 551         }
 552
 553         if (tv) {
 554                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 555                              (unsigned long long) timeval_load(tv)) >= 0)
 556                         IOVEC_SET_STRING(iovec[n++], source_time);
 557         }
 558
 559         /* Note that strictly speaking storing the boot id here is
 560          * redundant since the entry includes this in-line
 561          * anyway. However, we need this indexed, too. */
 562         r = sd_id128_get_boot(&id);
 563         if (r >= 0)
 564                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 565                         IOVEC_SET_STRING(iovec[n++], boot_id);
 566
 567         r = sd_id128_get_machine(&id);
 568         if (r >= 0)
 569                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 570                         IOVEC_SET_STRING(iovec[n++], machine_id);
 571
 572         t = gethostname_malloc();
 573         if (t) {
 574                 hostname = strappend("_HOSTNAME=", t);
 575                 free(t);
 576                 if (hostname)
 577                         IOVEC_SET_STRING(iovec[n++], hostname);
 578         }
 579
 580         assert(n <= m);
 581
 582         server_flush_to_var(s);
 583
 584 retry:
 585         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 586         if (!f)
 587                 log_warning("Dropping message, as we can't find a place to store the data.");
 588         else {
 589                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 590
 591                 if (r == -E2BIG && !vacuumed) {
 592                         log_info("Allocation limit reached.");
 593
 594                         server_rotate(s);
 595                         server_vacuum(s);
 596                         vacuumed = true;
 597
 598                         log_info("Retrying write.");
 599                         goto retry;
 600                 }
 601
 602                 if (r < 0)
 603                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 604         }
 605
 606         free(pid);
 607         free(uid);
 608         free(gid);
 609         free(comm);
 610         free(exe);
 611         free(cmdline);
 612         free(source_time);
 613         free(boot_id);
 614         free(machine_id);
 615         free(hostname);
 616         free(audit_session);
 617         free(audit_loginuid);
 618         free(cgroup);
 619         free(session);
 620         free(owner_uid);
 621         free(unit);
 622         free(selinux_context);
 623 }
 624
 625 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
 626         char mid[11 + 32 + 1];
 627         char buffer[16 + LINE_MAX + 1];
 628         struct iovec iovec[N_IOVEC_META_FIELDS + 4];
 629         int n = 0;
 630         va_list ap;
 631         struct ucred ucred;
 632
 633         assert(s);
 634         assert(format);
 635
 636         IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
 637         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
 638
 639         memcpy(buffer, "MESSAGE=", 8);
 640         va_start(ap, format);
 641         vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
 642         va_end(ap);
 643         char_array_0(buffer);
 644         IOVEC_SET_STRING(iovec[n++], buffer);
 645
 646         snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
 647         char_array_0(mid);
 648         IOVEC_SET_STRING(iovec[n++], mid);
 649
 650         zero(ucred);
 651         ucred.pid = getpid();
 652         ucred.uid = getuid();
 653         ucred.gid = getgid();
 654
 655         dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL);
 656 }
 657
 658 static void dispatch_message(Server *s,
 659                              struct iovec *iovec, unsigned n, unsigned m,
 660                              struct ucred *ucred,
 661                              struct timeval *tv,
 662                              int priority) {
 663         int rl;
 664         char *path = NULL, *c;
 665
 666         assert(s);
 667         assert(iovec || n == 0);
 668
 669         if (n == 0)
 670                 return;
 671
 672         if (!ucred)
 673                 goto finish;
 674
 675         path = shortened_cgroup_path(ucred->pid);
 676         if (!path)
 677                 goto finish;
 678
 679         /* example: /user/lennart/3/foobar
 680          *          /system/dbus.service/foobar
 681          *
 682          * So let's cut of everything past the third /, since that is
 683          * wher user directories start */
 684
 685         c = strchr(path, '/');
 686         if (c) {
 687                 c = strchr(c+1, '/');
 688                 if (c) {
 689                         c = strchr(c+1, '/');
 690                         if (c)
 691                                 *c = 0;
 692                 }
 693         }
 694
 695         rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
 696
 697         if (rl == 0) {
 698                 free(path);
 699                 return;
 700         }
 701
 702         /* Write a suppression message if we suppressed something */
 703         if (rl > 1)
 704                 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
 705
 706         free(path);
 707
 708 finish:
 709         dispatch_message_real(s, iovec, n, m, ucred, tv);
 710 }
 711
 712 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
 713         struct msghdr msghdr;
 714         struct cmsghdr *cmsg;
 715         union {
 716                 struct cmsghdr cmsghdr;
 717                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
 718         } control;
 719         union sockaddr_union sa;
 720
 721         assert(s);
 722         assert(iovec);
 723         assert(n_iovec > 0);
 724
 725         zero(msghdr);
 726         msghdr.msg_iov = (struct iovec*) iovec;
 727         msghdr.msg_iovlen = n_iovec;
 728
 729         zero(sa);
 730         sa.un.sun_family = AF_UNIX;
 731         strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
 732         msghdr.msg_name = &sa;
 733         msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
 734
 735         if (ucred) {
 736                 zero(control);
 737                 msghdr.msg_control = &control;
 738                 msghdr.msg_controllen = sizeof(control);
 739
 740                 cmsg = CMSG_FIRSTHDR(&msghdr);
 741                 cmsg->cmsg_level = SOL_SOCKET;
 742                 cmsg->cmsg_type = SCM_CREDENTIALS;
 743                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
 744                 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
 745                 msghdr.msg_controllen = cmsg->cmsg_len;
 746         }
 747
 748         /* Forward the syslog message we received via /dev/log to
 749          * /run/systemd/syslog. Unfortunately we currently can't set
 750          * the SO_TIMESTAMP auxiliary data, and hence we don't. */
 751
 752         if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
 753                 return;
 754
 755         /* The socket is full? I guess the syslog implementation is
 756          * too slow, and we shouldn't wait for that... */
 757         if (errno == EAGAIN)
 758                 return;
 759
 760         if (ucred && errno == ESRCH) {
 761                 struct ucred u;
 762
 763                 /* Hmm, presumably the sender process vanished
 764                  * by now, so let's fix it as good as we
 765                  * can, and retry */
 766
 767                 u = *ucred;
 768                 u.pid = getpid();
 769                 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
 770
 771                 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
 772                         return;
 773
 774                 if (errno == EAGAIN)
 775                         return;
 776         }
 777
 778         log_debug("Failed to forward syslog message: %m");
 779 }
 780
 781 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
 782         struct iovec iovec;
 783
 784         assert(s);
 785         assert(buffer);
 786
 787         IOVEC_SET_STRING(iovec, buffer);
 788         forward_syslog_iovec(s, &iovec, 1, ucred, tv);
 789 }
 790
 791 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
 792         struct iovec iovec[5];
 793         char header_priority[6], header_time[64], header_pid[16];
 794         int n = 0;
 795         time_t t;
 796         struct tm *tm;
 797         char *ident_buf = NULL;
 798
 799         assert(s);
 800         assert(priority >= 0);
 801         assert(priority <= 999);
 802         assert(message);
 803
 804         /* First: priority field */
 805         snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
 806         char_array_0(header_priority);
 807         IOVEC_SET_STRING(iovec[n++], header_priority);
 808
 809         /* Second: timestamp */
 810         t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
 811         tm = localtime(&t);
 812         if (!tm)
 813                 return;
 814         if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
 815                 return;
 816         IOVEC_SET_STRING(iovec[n++], header_time);
 817
 818         /* Third: identifier and PID */
 819         if (ucred) {
 820                 if (!identifier) {
 821                         get_process_comm(ucred->pid, &ident_buf);
 822                         identifier = ident_buf;
 823                 }
 824
 825                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 826                 char_array_0(header_pid);
 827
 828                 if (identifier)
 829                         IOVEC_SET_STRING(iovec[n++], identifier);
 830
 831                 IOVEC_SET_STRING(iovec[n++], header_pid);
 832         } else if (identifier) {
 833                 IOVEC_SET_STRING(iovec[n++], identifier);
 834                 IOVEC_SET_STRING(iovec[n++], ": ");
 835         }
 836
 837         /* Fourth: message */
 838         IOVEC_SET_STRING(iovec[n++], message);
 839
 840         forward_syslog_iovec(s, iovec, n, ucred, tv);
 841
 842         free(ident_buf);
 843 }
 844
 845 static int fixup_priority(int priority) {
 846
 847         if ((priority & LOG_FACMASK) == 0)
 848                 return (priority & LOG_PRIMASK) | LOG_USER;
 849
 850         return priority;
 851 }
 852
 853 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
 854         struct iovec iovec[5];
 855         char header_priority[6], header_pid[16];
 856         int n = 0;
 857         char *ident_buf = NULL;
 858         int fd;
 859
 860         assert(s);
 861         assert(priority >= 0);
 862         assert(priority <= 999);
 863         assert(message);
 864
 865         /* Never allow messages with kernel facility to be written to
 866          * kmsg, regardless where the data comes from. */
 867         priority = fixup_priority(priority);
 868
 869         /* First: priority field */
 870         snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
 871         char_array_0(header_priority);
 872         IOVEC_SET_STRING(iovec[n++], header_priority);
 873
 874         /* Second: identifier and PID */
 875         if (ucred) {
 876                 if (!identifier) {
 877                         get_process_comm(ucred->pid, &ident_buf);
 878                         identifier = ident_buf;
 879                 }
 880
 881                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 882                 char_array_0(header_pid);
 883
 884                 if (identifier)
 885                         IOVEC_SET_STRING(iovec[n++], identifier);
 886
 887                 IOVEC_SET_STRING(iovec[n++], header_pid);
 888         } else if (identifier) {
 889                 IOVEC_SET_STRING(iovec[n++], identifier);
 890                 IOVEC_SET_STRING(iovec[n++], ": ");
 891         }
 892
 893         /* Fourth: message */
 894         IOVEC_SET_STRING(iovec[n++], message);
 895         IOVEC_SET_STRING(iovec[n++], "\n");
 896
 897         fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 898         if (fd < 0) {
 899                 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
 900                 goto finish;
 901         }
 902
 903         if (writev(fd, iovec, n) < 0)
 904                 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
 905
 906         close_nointr_nofail(fd);
 907
 908 finish:
 909         free(ident_buf);
 910 }
 911
 912 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
 913         struct iovec iovec[4];
 914         char header_pid[16];
 915         int n = 0, fd;
 916         char *ident_buf = NULL;
 917
 918         assert(s);
 919         assert(message);
 920
 921         /* First: identifier and PID */
 922         if (ucred) {
 923                 if (!identifier) {
 924                         get_process_comm(ucred->pid, &ident_buf);
 925                         identifier = ident_buf;
 926                 }
 927
 928                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 929                 char_array_0(header_pid);
 930
 931                 if (identifier)
 932                         IOVEC_SET_STRING(iovec[n++], identifier);
 933
 934                 IOVEC_SET_STRING(iovec[n++], header_pid);
 935         } else if (identifier) {
 936                 IOVEC_SET_STRING(iovec[n++], identifier);
 937                 IOVEC_SET_STRING(iovec[n++], ": ");
 938         }
 939
 940         /* Third: message */
 941         IOVEC_SET_STRING(iovec[n++], message);
 942         IOVEC_SET_STRING(iovec[n++], "\n");
 943
 944         fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 945         if (fd < 0) {
 946                 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
 947                 goto finish;
 948         }
 949
 950         if (writev(fd, iovec, n) < 0)
 951                 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
 952
 953         close_nointr_nofail(fd);
 954
 955 finish:
 956         free(ident_buf);
 957 }
 958
 959 static void read_identifier(const char **buf, char **identifier, char **pid) {
 960         const char *p;
 961         char *t;
 962         size_t l, e;
 963
 964         assert(buf);
 965         assert(identifier);
 966         assert(pid);
 967
 968         p = *buf;
 969
 970         p += strspn(p, WHITESPACE);
 971         l = strcspn(p, WHITESPACE);
 972
 973         if (l <= 0 ||
 974             p[l-1] != ':')
 975                 return;
 976
 977         e = l;
 978         l--;
 979
 980         if (p[l-1] == ']') {
 981                 size_t k = l-1;
 982
 983                 for (;;) {
 984
 985                         if (p[k] == '[') {
 986                                 t = strndup(p+k+1, l-k-2);
 987                                 if (t)
 988                                         *pid = t;
 989
 990                                 l = k;
 991                                 break;
 992                         }
 993
 994                         if (k == 0)
 995                                 break;
 996
 997                         k--;
 998                 }
 999         }
1000
1001         t = strndup(p, l);
1002         if (t)
1003                 *identifier = t;
1004
1005         *buf = p + e;
1006         *buf += strspn(*buf, WHITESPACE);
1007 }
1008
1009 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
1010         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
1011         struct iovec iovec[N_IOVEC_META_FIELDS + 6];
1012         unsigned n = 0;
1013         int priority = LOG_USER | LOG_INFO;
1014         char *identifier = NULL, *pid = NULL;
1015
1016         assert(s);
1017         assert(buf);
1018
1019         if (s->forward_to_syslog)
1020                 forward_syslog_raw(s, buf, ucred, tv);
1021
1022         parse_syslog_priority((char**) &buf, &priority);
1023         skip_syslog_date((char**) &buf);
1024         read_identifier(&buf, &identifier, &pid);
1025
1026         if (s->forward_to_kmsg)
1027                 forward_kmsg(s, priority, identifier, buf, ucred);
1028
1029         if (s->forward_to_console)
1030                 forward_console(s, identifier, buf, ucred);
1031
1032         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
1033
1034         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1035                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1036
1037         if (priority & LOG_FACMASK)
1038                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1039                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1040
1041         if (identifier) {
1042                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1043                 if (syslog_identifier)
1044                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1045         }
1046
1047         if (pid) {
1048                 syslog_pid = strappend("SYSLOG_PID=", pid);
1049                 if (syslog_pid)
1050                         IOVEC_SET_STRING(iovec[n++], syslog_pid);
1051         }
1052
1053         message = strappend("MESSAGE=", buf);
1054         if (message)
1055                 IOVEC_SET_STRING(iovec[n++], message);
1056
1057         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority);
1058
1059         free(message);
1060         free(identifier);
1061         free(pid);
1062         free(syslog_priority);
1063         free(syslog_facility);
1064         free(syslog_identifier);
1065 }
1066
1067 static bool valid_user_field(const char *p, size_t l) {
1068         const char *a;
1069
1070         /* We kinda enforce POSIX syntax recommendations for
1071            environment variables here, but make a couple of additional
1072            requirements.
1073
1074            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1075
1076         /* No empty field names */
1077         if (l <= 0)
1078                 return false;
1079
1080         /* Don't allow names longer than 64 chars */
1081         if (l > 64)
1082                 return false;
1083
1084         /* Variables starting with an underscore are protected */
1085         if (p[0] == '_')
1086                 return false;
1087
1088         /* Don't allow digits as first character */
1089         if (p[0] >= '0' && p[0] <= '9')
1090                 return false;
1091
1092         /* Only allow A-Z0-9 and '_' */
1093         for (a = p; a < p + l; a++)
1094                 if (!((*a >= 'A' && *a <= 'Z') ||
1095                       (*a >= '0' && *a <= '9') ||
1096                       *a == '_'))
1097                         return false;
1098
1099         return true;
1100 }
1101
1102 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
1103         struct iovec *iovec = NULL;
1104         unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1105         const char *p;
1106         size_t remaining;
1107         int priority = LOG_INFO;
1108         char *identifier = NULL, *message = NULL;
1109
1110         assert(s);
1111         assert(buffer || n == 0);
1112
1113         p = buffer;
1114         remaining = buffer_size;
1115
1116         while (remaining > 0) {
1117                 const char *e, *q;
1118
1119                 e = memchr(p, '\n', remaining);
1120
1121                 if (!e) {
1122                         /* Trailing noise, let's ignore it, and flush what we collected */
1123                         log_debug("Received message with trailing noise, ignoring.");
1124                         break;
1125                 }
1126
1127                 if (e == p) {
1128                         /* Entry separator */
1129                         dispatch_message(s, iovec, n, m, ucred, tv, priority);
1130                         n = 0;
1131                         priority = LOG_INFO;
1132
1133                         p++;
1134                         remaining--;
1135                         continue;
1136                 }
1137
1138                 if (*p == '.' || *p == '#') {
1139                         /* Ignore control commands for now, and
1140                          * comments too. */
1141                         remaining -= (e - p) + 1;
1142                         p = e + 1;
1143                         continue;
1144                 }
1145
1146                 /* A property follows */
1147
1148                 if (n+N_IOVEC_META_FIELDS >= m) {
1149                         struct iovec *c;
1150                         unsigned u;
1151
1152                         u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1153                         c = realloc(iovec, u * sizeof(struct iovec));
1154                         if (!c) {
1155                                 log_error("Out of memory");
1156                                 break;
1157                         }
1158
1159                         iovec = c;
1160                         m = u;
1161                 }
1162
1163                 q = memchr(p, '=', e - p);
1164                 if (q) {
1165                         if (valid_user_field(p, q - p)) {
1166                                 size_t l;
1167
1168                                 l = e - p;
1169
1170                                 /* If the field name starts with an
1171                                  * underscore, skip the variable,
1172                                  * since that indidates a trusted
1173                                  * field */
1174                                 iovec[n].iov_base = (char*) p;
1175                                 iovec[n].iov_len = l;
1176                                 n++;
1177
1178                                 /* We need to determine the priority
1179                                  * of this entry for the rate limiting
1180                                  * logic */
1181                                 if (l == 10 &&
1182                                     memcmp(p, "PRIORITY=", 9) == 0 &&
1183                                     p[9] >= '0' && p[9] <= '9')
1184                                         priority = (priority & LOG_FACMASK) | (p[9] - '0');
1185
1186                                 else if (l == 17 &&
1187                                          memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1188                                          p[16] >= '0' && p[16] <= '9')
1189                                         priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1190
1191                                 else if (l == 18 &&
1192                                          memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1193                                          p[16] >= '0' && p[16] <= '9' &&
1194                                          p[17] >= '0' && p[17] <= '9')
1195                                         priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1196
1197                                 else if (l >= 12 &&
1198                                          memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1199                                         char *t;
1200
1201                                         t = strndup(p + 11, l - 11);
1202                                         if (t) {
1203                                                 free(identifier);
1204                                                 identifier = t;
1205                                         }
1206                                 } else if (l >= 8 &&
1207                                            memcmp(p, "MESSAGE=", 8) == 0) {
1208                                         char *t;
1209
1210                                         t = strndup(p + 8, l - 8);
1211                                         if (t) {
1212                                                 free(message);
1213                                                 message = t;
1214                                         }
1215                                 }
1216                         }
1217
1218                         remaining -= (e - p) + 1;
1219                         p = e + 1;
1220                         continue;
1221                 } else {
1222                         uint64_t l;
1223                         char *k;
1224
1225                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1226                                 log_debug("Failed to parse message, ignoring.");
1227                                 break;
1228                         }
1229
1230                         memcpy(&l, e + 1, sizeof(uint64_t));
1231                         l = le64toh(l);
1232
1233                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1234                             e[1+sizeof(uint64_t)+l] != '\n') {
1235                                 log_debug("Failed to parse message, ignoring.");
1236                                 break;
1237                         }
1238
1239                         k = malloc((e - p) + 1 + l);
1240                         if (!k) {
1241                                 log_error("Out of memory");
1242                                 break;
1243                         }
1244
1245                         memcpy(k, p, e - p);
1246                         k[e - p] = '=';
1247                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1248
1249                         if (valid_user_field(p, e - p)) {
1250                                 iovec[n].iov_base = k;
1251                                 iovec[n].iov_len = (e - p) + 1 + l;
1252                                 n++;
1253                         } else
1254                                 free(k);
1255
1256                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1257                         p = e + 1 + sizeof(uint64_t) + l + 1;
1258                 }
1259         }
1260
1261         if (n <= 0)
1262                 goto finish;
1263
1264         tn = n++;
1265         IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1266
1267         if (message) {
1268                 if (s->forward_to_syslog)
1269                         forward_syslog(s, priority, identifier, message, ucred, tv);
1270
1271                 if (s->forward_to_kmsg)
1272                         forward_kmsg(s, priority, identifier, message, ucred);
1273
1274                 if (s->forward_to_console)
1275                         forward_console(s, identifier, message, ucred);
1276         }
1277
1278         dispatch_message(s, iovec, n, m, ucred, tv, priority);
1279
1280 finish:
1281         for (j = 0; j < n; j++)  {
1282                 if (j == tn)
1283                         continue;
1284
1285                 if (iovec[j].iov_base < buffer ||
1286                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1287                         free(iovec[j].iov_base);
1288         }
1289
1290         free(identifier);
1291         free(message);
1292 }
1293
1294 static int stdout_stream_log(StdoutStream *s, const char *p) {
1295         struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1296         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1297         unsigned n = 0;
1298         int priority;
1299
1300         assert(s);
1301         assert(p);
1302
1303         priority = s->priority;
1304
1305         if (s->level_prefix)
1306                 parse_syslog_priority((char**) &p, &priority);
1307
1308         if (s->forward_to_syslog || s->server->forward_to_syslog)
1309                 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1310
1311         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1312                 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1313
1314         if (s->forward_to_console || s->server->forward_to_console)
1315                 forward_console(s->server, s->identifier, p, &s->ucred);
1316
1317         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1318
1319         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1320                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1321
1322         if (priority & LOG_FACMASK)
1323                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1324                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1325
1326         if (s->identifier) {
1327                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1328                 if (syslog_identifier)
1329                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1330         }
1331
1332         message = strappend("MESSAGE=", p);
1333         if (message)
1334                 IOVEC_SET_STRING(iovec[n++], message);
1335
1336         dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
1337
1338         free(message);
1339         free(syslog_priority);
1340         free(syslog_facility);
1341         free(syslog_identifier);
1342
1343         return 0;
1344 }
1345
1346 static int stdout_stream_line(StdoutStream *s, char *p) {
1347         int r;
1348
1349         assert(s);
1350         assert(p);
1351
1352         p = strstrip(p);
1353
1354         switch (s->state) {
1355
1356         case STDOUT_STREAM_IDENTIFIER:
1357                 s->identifier = strdup(p);
1358                 if (!s->identifier) {
1359                         log_error("Out of memory");
1360                         return -ENOMEM;
1361                 }
1362
1363                 s->state = STDOUT_STREAM_PRIORITY;
1364                 return 0;
1365
1366         case STDOUT_STREAM_PRIORITY:
1367                 r = safe_atoi(p, &s->priority);
1368                 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1369                         log_warning("Failed to parse log priority line.");
1370                         return -EINVAL;
1371                 }
1372
1373                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1374                 return 0;
1375
1376         case STDOUT_STREAM_LEVEL_PREFIX:
1377                 r = parse_boolean(p);
1378                 if (r < 0) {
1379                         log_warning("Failed to parse level prefix line.");
1380                         return -EINVAL;
1381                 }
1382
1383                 s->level_prefix = !!r;
1384                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1385                 return 0;
1386
1387         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1388                 r = parse_boolean(p);
1389                 if (r < 0) {
1390                         log_warning("Failed to parse forward to syslog line.");
1391                         return -EINVAL;
1392                 }
1393
1394                 s->forward_to_syslog = !!r;
1395                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1396                 return 0;
1397
1398         case STDOUT_STREAM_FORWARD_TO_KMSG:
1399                 r = parse_boolean(p);
1400                 if (r < 0) {
1401                         log_warning("Failed to parse copy to kmsg line.");
1402                         return -EINVAL;
1403                 }
1404
1405                 s->forward_to_kmsg = !!r;
1406                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1407                 return 0;
1408
1409         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1410                 r = parse_boolean(p);
1411                 if (r < 0) {
1412                         log_warning("Failed to parse copy to console line.");
1413                         return -EINVAL;
1414                 }
1415
1416                 s->forward_to_console = !!r;
1417                 s->state = STDOUT_STREAM_RUNNING;
1418                 return 0;
1419
1420         case STDOUT_STREAM_RUNNING:
1421                 return stdout_stream_log(s, p);
1422         }
1423
1424         assert_not_reached("Unknown stream state");
1425 }
1426
1427 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1428         char *p;
1429         size_t remaining;
1430         int r;
1431
1432         assert(s);
1433
1434         p = s->buffer;
1435         remaining = s->length;
1436         for (;;) {
1437                 char *end;
1438                 size_t skip;
1439
1440                 end = memchr(p, '\n', remaining);
1441                 if (end)
1442                         skip = end - p + 1;
1443                 else if (remaining >= sizeof(s->buffer) - 1) {
1444                         end = p + sizeof(s->buffer) - 1;
1445                         skip = remaining;
1446                 } else
1447                         break;
1448
1449                 *end = 0;
1450
1451                 r = stdout_stream_line(s, p);
1452                 if (r < 0)
1453                         return r;
1454
1455                 remaining -= skip;
1456                 p += skip;
1457         }
1458
1459         if (force_flush && remaining > 0) {
1460                 p[remaining] = 0;
1461                 r = stdout_stream_line(s, p);
1462                 if (r < 0)
1463                         return r;
1464
1465                 p += remaining;
1466                 remaining = 0;
1467         }
1468
1469         if (p > s->buffer) {
1470                 memmove(s->buffer, p, remaining);
1471                 s->length = remaining;
1472         }
1473
1474         return 0;
1475 }
1476
1477 static int stdout_stream_process(StdoutStream *s) {
1478         ssize_t l;
1479         int r;
1480
1481         assert(s);
1482
1483         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1484         if (l < 0) {
1485
1486                 if (errno == EAGAIN)
1487                         return 0;
1488
1489                 log_warning("Failed to read from stream: %m");
1490                 return -errno;
1491         }
1492
1493         if (l == 0) {
1494                 r = stdout_stream_scan(s, true);
1495                 if (r < 0)
1496                         return r;
1497
1498                 return 0;
1499         }
1500
1501         s->length += l;
1502         r = stdout_stream_scan(s, false);
1503         if (r < 0)
1504                 return r;
1505
1506         return 1;
1507
1508 }
1509
1510 static void stdout_stream_free(StdoutStream *s) {
1511         assert(s);
1512
1513         if (s->server) {
1514                 assert(s->server->n_stdout_streams > 0);
1515                 s->server->n_stdout_streams --;
1516                 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1517         }
1518
1519         if (s->fd >= 0) {
1520                 if (s->server)
1521                         epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1522
1523                 close_nointr_nofail(s->fd);
1524         }
1525
1526         free(s->identifier);
1527         free(s);
1528 }
1529
1530 static int stdout_stream_new(Server *s) {
1531         StdoutStream *stream;
1532         int fd, r;
1533         socklen_t len;
1534         struct epoll_event ev;
1535
1536         assert(s);
1537
1538         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1539         if (fd < 0) {
1540                 if (errno == EAGAIN)
1541                         return 0;
1542
1543                 log_error("Failed to accept stdout connection: %m");
1544                 return -errno;
1545         }
1546
1547         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1548                 log_warning("Too many stdout streams, refusing connection.");
1549                 close_nointr_nofail(fd);
1550                 return 0;
1551         }
1552
1553         stream = new0(StdoutStream, 1);
1554         if (!stream) {
1555                 log_error("Out of memory.");
1556                 close_nointr_nofail(fd);
1557                 return -ENOMEM;
1558         }
1559
1560         stream->fd = fd;
1561
1562         len = sizeof(stream->ucred);
1563         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1564                 log_error("Failed to determine peer credentials: %m");
1565                 r = -errno;
1566                 goto fail;
1567         }
1568
1569         if (shutdown(fd, SHUT_WR) < 0) {
1570                 log_error("Failed to shutdown writing side of socket: %m");
1571                 r = -errno;
1572                 goto fail;
1573         }
1574
1575         zero(ev);
1576         ev.data.ptr = stream;
1577         ev.events = EPOLLIN;
1578         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1579                 log_error("Failed to add stream to event loop: %m");
1580                 r = -errno;
1581                 goto fail;
1582         }
1583
1584         stream->server = s;
1585         LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1586         s->n_stdout_streams ++;
1587
1588         return 0;
1589
1590 fail:
1591         stdout_stream_free(stream);
1592         return r;
1593 }
1594
1595 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1596         usec_t r;
1597         int k, i;
1598         char *p;
1599
1600         assert(_p);
1601         assert(*_p);
1602         assert(t);
1603
1604         p = *_p;
1605
1606         if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1607                 return 0;
1608
1609         r = 0;
1610
1611         for (i = 1; i <= 5; i++) {
1612                 r *= 10;
1613
1614                 if (p[i] == ' ')
1615                         continue;
1616
1617                 k = undecchar(p[i]);
1618                 if (k < 0)
1619                         return 0;
1620
1621                 r += k;
1622         }
1623
1624         for (i = 7; i <= 12; i++) {
1625                 r *= 10;
1626
1627                 k = undecchar(p[i]);
1628                 if (k < 0)
1629                         return 0;
1630
1631                 r += k;
1632         }
1633
1634         *t = r;
1635         *_p += 14;
1636         *_p += strspn(*_p, WHITESPACE);
1637
1638         return 1;
1639 }
1640
1641 static void proc_kmsg_line(Server *s, const char *p) {
1642         struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1643         char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1644         int priority = LOG_KERN | LOG_INFO;
1645         unsigned n = 0;
1646         usec_t usec;
1647         char *identifier = NULL, *pid = NULL;
1648
1649         assert(s);
1650         assert(p);
1651
1652         parse_syslog_priority((char **) &p, &priority);
1653
1654         if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1655                 return;
1656
1657         if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1658                 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1659                              (unsigned long long) usec) >= 0)
1660                         IOVEC_SET_STRING(iovec[n++], source_time);
1661         }
1662
1663         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1664
1665         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1666                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1667
1668         if ((priority & LOG_FACMASK) == LOG_KERN) {
1669
1670                 if (s->forward_to_syslog)
1671                         forward_syslog(s, priority, "kernel", p, NULL, NULL);
1672
1673                 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1674         } else {
1675                 read_identifier(&p, &identifier, &pid);
1676
1677                 if (s->forward_to_syslog)
1678                         forward_syslog(s, priority, identifier, p, NULL, NULL);
1679
1680                 if (identifier) {
1681                         syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1682                         if (syslog_identifier)
1683                                 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1684                 }
1685
1686                 if (pid) {
1687                         syslog_pid = strappend("SYSLOG_PID=", pid);
1688                         if (syslog_pid)
1689                                 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1690                 }
1691
1692                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1693                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1694         }
1695
1696         message = strappend("MESSAGE=", p);
1697         if (message)
1698                 IOVEC_SET_STRING(iovec[n++], message);
1699
1700
1701         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, priority);
1702
1703         free(message);
1704         free(syslog_priority);
1705         free(syslog_identifier);
1706         free(syslog_pid);
1707         free(syslog_facility);
1708         free(source_time);
1709         free(identifier);
1710         free(pid);
1711 }
1712
1713 static void proc_kmsg_scan(Server *s) {
1714         char *p;
1715         size_t remaining;
1716
1717         assert(s);
1718
1719         p = s->proc_kmsg_buffer;
1720         remaining = s->proc_kmsg_length;
1721         for (;;) {
1722                 char *end;
1723                 size_t skip;
1724
1725                 end = memchr(p, '\n', remaining);
1726                 if (end)
1727                         skip = end - p + 1;
1728                 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1729                         end = p + sizeof(s->proc_kmsg_buffer) - 1;
1730                         skip = remaining;
1731                 } else
1732                         break;
1733
1734                 *end = 0;
1735
1736                 proc_kmsg_line(s, p);
1737
1738                 remaining -= skip;
1739                 p += skip;
1740         }
1741
1742         if (p > s->proc_kmsg_buffer) {
1743                 memmove(s->proc_kmsg_buffer, p, remaining);
1744                 s->proc_kmsg_length = remaining;
1745         }
1746 }
1747
1748 static int system_journal_open(Server *s) {
1749         int r;
1750         char *fn;
1751         sd_id128_t machine;
1752         char ids[33];
1753
1754         r = sd_id128_get_machine(&machine);
1755         if (r < 0)
1756                 return r;
1757
1758         sd_id128_to_string(machine, ids);
1759
1760         if (!s->system_journal) {
1761
1762                 /* First try to create the machine path, but not the prefix */
1763                 fn = strappend("/var/log/journal/", ids);
1764                 if (!fn)
1765                         return -ENOMEM;
1766                 (void) mkdir(fn, 0755);
1767                 free(fn);
1768
1769                 /* The create the system journal file */
1770                 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1771                 if (!fn)
1772                         return -ENOMEM;
1773
1774                 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1775                 free(fn);
1776
1777                 if (r >= 0) {
1778                         journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1779
1780                         s->system_journal->metrics = s->system_metrics;
1781                         s->system_journal->compress = s->compress;
1782
1783                         server_fix_perms(s, s->system_journal, 0);
1784                 } else if (r < 0) {
1785
1786                         if (r != -ENOENT && r != -EROFS)
1787                                 log_warning("Failed to open system journal: %s", strerror(-r));
1788
1789                         r = 0;
1790                 }
1791         }
1792
1793         if (!s->runtime_journal) {
1794
1795                 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1796                 if (!fn)
1797                         return -ENOMEM;
1798
1799                 if (s->system_journal) {
1800
1801                         /* Try to open the runtime journal, but only
1802                          * if it already exists, so that we can flush
1803                          * it into the system journal */
1804
1805                         r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1806                         free(fn);
1807
1808                         if (r < 0) {
1809                                 if (r != -ENOENT)
1810                                         log_warning("Failed to open runtime journal: %s", strerror(-r));
1811
1812                                 r = 0;
1813                         }
1814
1815                 } else {
1816
1817                         /* OK, we really need the runtime journal, so create
1818                          * it if necessary. */
1819
1820                         (void) mkdir_parents(fn, 0755);
1821                         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1822                         free(fn);
1823
1824                         if (r < 0) {
1825                                 log_error("Failed to open runtime journal: %s", strerror(-r));
1826                                 return r;
1827                         }
1828                 }
1829
1830                 if (s->runtime_journal) {
1831                         journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1832
1833                         s->runtime_journal->metrics = s->runtime_metrics;
1834                         s->runtime_journal->compress = s->compress;
1835
1836                         server_fix_perms(s, s->runtime_journal, 0);
1837                 }
1838         }
1839
1840         return r;
1841 }
1842
1843 static int server_flush_to_var(Server *s) {
1844         char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1845         Object *o = NULL;
1846         int r;
1847         sd_id128_t machine;
1848         sd_journal *j;
1849         usec_t ts;
1850
1851         assert(s);
1852
1853         if (!s->runtime_journal)
1854                 return 0;
1855
1856         ts = now(CLOCK_MONOTONIC);
1857         if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1858                 return 0;
1859
1860         s->var_available_timestamp = ts;
1861
1862         system_journal_open(s);
1863
1864         if (!s->system_journal)
1865                 return 0;
1866
1867         log_info("Flushing to /var...");
1868
1869         r = sd_id128_get_machine(&machine);
1870         if (r < 0) {
1871                 log_error("Failed to get machine id: %s", strerror(-r));
1872                 return r;
1873         }
1874
1875         r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1876         if (r < 0) {
1877                 log_error("Failed to read runtime journal: %s", strerror(-r));
1878                 return r;
1879         }
1880
1881         SD_JOURNAL_FOREACH(j) {
1882                 JournalFile *f;
1883
1884                 f = j->current_file;
1885                 assert(f && f->current_offset > 0);
1886
1887                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1888                 if (r < 0) {
1889                         log_error("Can't read entry: %s", strerror(-r));
1890                         goto finish;
1891                 }
1892
1893                 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1894                 if (r == -E2BIG) {
1895                         log_info("Allocation limit reached.");
1896
1897                         journal_file_post_change(s->system_journal);
1898                         server_rotate(s);
1899                         server_vacuum(s);
1900
1901                         r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1902                 }
1903
1904                 if (r < 0) {
1905                         log_error("Can't write entry: %s", strerror(-r));
1906                         goto finish;
1907                 }
1908         }
1909
1910 finish:
1911         journal_file_post_change(s->system_journal);
1912
1913         journal_file_close(s->runtime_journal);
1914         s->runtime_journal = NULL;
1915
1916         if (r >= 0) {
1917                 sd_id128_to_string(machine, path + 17);
1918                 rm_rf(path, false, true, false);
1919         }
1920
1921         return r;
1922 }
1923
1924 static int server_read_proc_kmsg(Server *s) {
1925         ssize_t l;
1926         assert(s);
1927         assert(s->proc_kmsg_fd >= 0);
1928
1929         l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
1930         if (l < 0) {
1931
1932                 if (errno == EAGAIN || errno == EINTR)
1933                         return 0;
1934
1935                 log_error("Failed to read from kernel: %m");
1936                 return -errno;
1937         }
1938
1939         s->proc_kmsg_length += l;
1940
1941         proc_kmsg_scan(s);
1942         return 1;
1943 }
1944
1945 static int server_flush_proc_kmsg(Server *s) {
1946         int r;
1947
1948         assert(s);
1949
1950         if (s->proc_kmsg_fd < 0)
1951                 return 0;
1952
1953         log_info("Flushing /proc/kmsg...");
1954
1955         for (;;) {
1956                 r = server_read_proc_kmsg(s);
1957                 if (r < 0)
1958                         return r;
1959
1960                 if (r == 0)
1961                         break;
1962         }
1963
1964         return 0;
1965 }
1966
1967 static int process_event(Server *s, struct epoll_event *ev) {
1968         assert(s);
1969
1970         if (ev->data.fd == s->signal_fd) {
1971                 struct signalfd_siginfo sfsi;
1972                 ssize_t n;
1973
1974                 if (ev->events != EPOLLIN) {
1975                         log_info("Got invalid event from epoll.");
1976                         return -EIO;
1977                 }
1978
1979                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
1980                 if (n != sizeof(sfsi)) {
1981
1982                         if (n >= 0)
1983                                 return -EIO;
1984
1985                         if (errno == EINTR || errno == EAGAIN)
1986                                 return 1;
1987
1988                         return -errno;
1989                 }
1990
1991                 if (sfsi.ssi_signo == SIGUSR1) {
1992                         server_flush_to_var(s);
1993                         return 0;
1994                 }
1995
1996                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1997                 return 0;
1998
1999         } else if (ev->data.fd == s->proc_kmsg_fd) {
2000                 int r;
2001
2002                 if (ev->events != EPOLLIN) {
2003                         log_info("Got invalid event from epoll.");
2004                         return -EIO;
2005                 }
2006
2007                 r = server_read_proc_kmsg(s);
2008                 if (r < 0)
2009                         return r;
2010
2011                 return 1;
2012
2013         } else if (ev->data.fd == s->native_fd ||
2014                    ev->data.fd == s->syslog_fd) {
2015
2016                 if (ev->events != EPOLLIN) {
2017                         log_info("Got invalid event from epoll.");
2018                         return -EIO;
2019                 }
2020
2021                 for (;;) {
2022                         struct msghdr msghdr;
2023                         struct iovec iovec;
2024                         struct ucred *ucred = NULL;
2025                         struct timeval *tv = NULL;
2026                         struct cmsghdr *cmsg;
2027                         union {
2028                                 struct cmsghdr cmsghdr;
2029                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2030                                             CMSG_SPACE(sizeof(struct timeval))];
2031                         } control;
2032                         ssize_t n;
2033                         int v;
2034
2035                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
2036                                 log_error("SIOCINQ failed: %m");
2037                                 return -errno;
2038                         }
2039
2040                         if (v <= 0)
2041                                 return 1;
2042
2043                         if (s->buffer_size < (size_t) v) {
2044                                 void *b;
2045                                 size_t l;
2046
2047                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2048                                 b = realloc(s->buffer, l+1);
2049
2050                                 if (!b) {
2051                                         log_error("Couldn't increase buffer.");
2052                                         return -ENOMEM;
2053                                 }
2054
2055                                 s->buffer_size = l;
2056                                 s->buffer = b;
2057                         }
2058
2059                         zero(iovec);
2060                         iovec.iov_base = s->buffer;
2061                         iovec.iov_len = s->buffer_size;
2062
2063                         zero(control);
2064                         zero(msghdr);
2065                         msghdr.msg_iov = &iovec;
2066                         msghdr.msg_iovlen = 1;
2067                         msghdr.msg_control = &control;
2068                         msghdr.msg_controllen = sizeof(control);
2069
2070                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
2071                         if (n < 0) {
2072
2073                                 if (errno == EINTR || errno == EAGAIN)
2074                                         return 1;
2075
2076                                 log_error("recvmsg() failed: %m");
2077                                 return -errno;
2078                         }
2079
2080                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2081
2082                                 if (cmsg->cmsg_level == SOL_SOCKET &&
2083                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
2084                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2085                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
2086                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
2087                                          cmsg->cmsg_type == SO_TIMESTAMP &&
2088                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2089                                         tv = (struct timeval*) CMSG_DATA(cmsg);
2090                         }
2091
2092                         if (ev->data.fd == s->syslog_fd) {
2093                                 char *e;
2094
2095                                 e = memchr(s->buffer, '\n', n);
2096                                 if (e)
2097                                         *e = 0;
2098                                 else
2099                                         s->buffer[n] = 0;
2100
2101                                 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
2102                         } else
2103                                 process_native_message(s, s->buffer, n, ucred, tv);
2104                 }
2105
2106                 return 1;
2107
2108         } else if (ev->data.fd == s->stdout_fd) {
2109
2110                 if (ev->events != EPOLLIN) {
2111                         log_info("Got invalid event from epoll.");
2112                         return -EIO;
2113                 }
2114
2115                 stdout_stream_new(s);
2116                 return 1;
2117
2118         } else {
2119                 StdoutStream *stream;
2120
2121                 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2122                         log_info("Got invalid event from epoll.");
2123                         return -EIO;
2124                 }
2125
2126                 /* If it is none of the well-known fds, it must be an
2127                  * stdout stream fd. Note that this is a bit ugly here
2128                  * (since we rely that none of the well-known fds
2129                  * could be interpreted as pointer), but nonetheless
2130                  * safe, since the well-known fds would never get an
2131                  * fd > 4096, i.e. beyond the first memory page */
2132
2133                 stream = ev->data.ptr;
2134
2135                 if (stdout_stream_process(stream) <= 0)
2136                         stdout_stream_free(stream);
2137
2138                 return 1;
2139         }
2140
2141         log_error("Unknown event.");
2142         return 0;
2143 }
2144
2145 static int open_syslog_socket(Server *s) {
2146         union sockaddr_union sa;
2147         int one, r;
2148         struct epoll_event ev;
2149         struct timeval tv;
2150
2151         assert(s);
2152
2153         if (s->syslog_fd < 0) {
2154
2155                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2156                 if (s->syslog_fd < 0) {
2157                         log_error("socket() failed: %m");
2158                         return -errno;
2159                 }
2160
2161                 zero(sa);
2162                 sa.un.sun_family = AF_UNIX;
2163                 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2164
2165                 unlink(sa.un.sun_path);
2166
2167                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2168                 if (r < 0) {
2169                         log_error("bind() failed: %m");
2170                         return -errno;
2171                 }
2172
2173                 chmod(sa.un.sun_path, 0666);
2174         }
2175
2176         one = 1;
2177         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2178         if (r < 0) {
2179                 log_error("SO_PASSCRED failed: %m");
2180                 return -errno;
2181         }
2182
2183         one = 1;
2184         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2185         if (r < 0) {
2186                 log_error("SO_TIMESTAMP failed: %m");
2187                 return -errno;
2188         }
2189
2190         /* Since we use the same socket for forwarding this to some
2191          * other syslog implementation, make sure we don't hang
2192          * forever */
2193         timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
2194         if (setsockopt(s->syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
2195                 log_error("SO_SNDTIMEO failed: %m");
2196                 return -errno;
2197         }
2198
2199         zero(ev);
2200         ev.events = EPOLLIN;
2201         ev.data.fd = s->syslog_fd;
2202         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2203                 log_error("Failed to add syslog server fd to epoll object: %m");
2204                 return -errno;
2205         }
2206
2207         return 0;
2208 }
2209
2210 static int open_native_socket(Server*s) {
2211         union sockaddr_union sa;
2212         int one, r;
2213         struct epoll_event ev;
2214
2215         assert(s);
2216
2217         if (s->native_fd < 0) {
2218
2219                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2220                 if (s->native_fd < 0) {
2221                         log_error("socket() failed: %m");
2222                         return -errno;
2223                 }
2224
2225                 zero(sa);
2226                 sa.un.sun_family = AF_UNIX;
2227                 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2228
2229                 unlink(sa.un.sun_path);
2230
2231                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2232                 if (r < 0) {
2233                         log_error("bind() failed: %m");
2234                         return -errno;
2235                 }
2236
2237                 chmod(sa.un.sun_path, 0666);
2238         }
2239
2240         one = 1;
2241         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2242         if (r < 0) {
2243                 log_error("SO_PASSCRED failed: %m");
2244                 return -errno;
2245         }
2246
2247         one = 1;
2248         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2249         if (r < 0) {
2250                 log_error("SO_TIMESTAMP failed: %m");
2251                 return -errno;
2252         }
2253
2254         zero(ev);
2255         ev.events = EPOLLIN;
2256         ev.data.fd = s->native_fd;
2257         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2258                 log_error("Failed to add native server fd to epoll object: %m");
2259                 return -errno;
2260         }
2261
2262         return 0;
2263 }
2264
2265 static int open_stdout_socket(Server *s) {
2266         union sockaddr_union sa;
2267         int r;
2268         struct epoll_event ev;
2269
2270         assert(s);
2271
2272         if (s->stdout_fd < 0) {
2273
2274                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2275                 if (s->stdout_fd < 0) {
2276                         log_error("socket() failed: %m");
2277                         return -errno;
2278                 }
2279
2280                 zero(sa);
2281                 sa.un.sun_family = AF_UNIX;
2282                 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2283
2284                 unlink(sa.un.sun_path);
2285
2286                 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2287                 if (r < 0) {
2288                         log_error("bind() failed: %m");
2289                         return -errno;
2290                 }
2291
2292                 chmod(sa.un.sun_path, 0666);
2293
2294                 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2295                         log_error("liste() failed: %m");
2296                         return -errno;
2297                 }
2298         }
2299
2300         zero(ev);
2301         ev.events = EPOLLIN;
2302         ev.data.fd = s->stdout_fd;
2303         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2304                 log_error("Failed to add stdout server fd to epoll object: %m");
2305                 return -errno;
2306         }
2307
2308         return 0;
2309 }
2310
2311 static int open_proc_kmsg(Server *s) {
2312         struct epoll_event ev;
2313
2314         assert(s);
2315
2316         if (!s->import_proc_kmsg)
2317                 return 0;
2318
2319
2320         s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2321         if (s->proc_kmsg_fd < 0) {
2322                 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2323                 return 0;
2324         }
2325
2326         zero(ev);
2327         ev.events = EPOLLIN;
2328         ev.data.fd = s->proc_kmsg_fd;
2329         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2330                 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2331                 return -errno;
2332         }
2333
2334         return 0;
2335 }
2336
2337 static int open_signalfd(Server *s) {
2338         sigset_t mask;
2339         struct epoll_event ev;
2340
2341         assert(s);
2342
2343         assert_se(sigemptyset(&mask) == 0);
2344         sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2345         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2346
2347         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2348         if (s->signal_fd < 0) {
2349                 log_error("signalfd(): %m");
2350                 return -errno;
2351         }
2352
2353         zero(ev);
2354         ev.events = EPOLLIN;
2355         ev.data.fd = s->signal_fd;
2356
2357         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2358                 log_error("epoll_ctl(): %m");
2359                 return -errno;
2360         }
2361
2362         return 0;
2363 }
2364
2365 static int server_parse_proc_cmdline(Server *s) {
2366         char *line, *w, *state;
2367         int r;
2368         size_t l;
2369
2370         if (detect_container(NULL) > 0)
2371                 return 0;
2372
2373         r = read_one_line_file("/proc/cmdline", &line);
2374         if (r < 0) {
2375                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2376                 return 0;
2377         }
2378
2379         FOREACH_WORD_QUOTED(w, l, line, state) {
2380                 char *word;
2381
2382                 word = strndup(w, l);
2383                 if (!word) {
2384                         r = -ENOMEM;
2385                         goto finish;
2386                 }
2387
2388                 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2389                         r = parse_boolean(word + 35);
2390                         if (r < 0)
2391                                 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2392                         else
2393                                 s->forward_to_syslog = r;
2394                 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2395                         r = parse_boolean(word + 33);
2396                         if (r < 0)
2397                                 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2398                         else
2399                                 s->forward_to_kmsg = r;
2400                 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2401                         r = parse_boolean(word + 36);
2402                         if (r < 0)
2403                                 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2404                         else
2405                                 s->forward_to_console = r;
2406                 }
2407
2408                 free(word);
2409         }
2410
2411         r = 0;
2412
2413 finish:
2414         free(line);
2415         return r;
2416 }
2417
2418 static int server_parse_config_file(Server *s) {
2419         FILE *f;
2420         const char *fn;
2421         int r;
2422
2423         assert(s);
2424
2425         fn = "/etc/systemd/systemd-journald.conf";
2426         f = fopen(fn, "re");
2427         if (!f) {
2428                 if (errno == ENOENT)
2429                         return 0;
2430
2431                 log_warning("Failed to open configuration file %s: %m", fn);
2432                 return -errno;
2433         }
2434
2435         r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2436         if (r < 0)
2437                 log_warning("Failed to parse configuration file: %s", strerror(-r));
2438
2439         fclose(f);
2440
2441         return r;
2442 }
2443
2444 static int server_init(Server *s) {
2445         int n, r, fd;
2446
2447         assert(s);
2448
2449         zero(*s);
2450         s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2451         s->compress = true;
2452
2453         s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2454         s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2455
2456         s->forward_to_syslog = true;
2457         s->import_proc_kmsg = true;
2458
2459         memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2460         memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2461
2462         server_parse_config_file(s);
2463         server_parse_proc_cmdline(s);
2464
2465         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2466         if (!s->user_journals) {
2467                 log_error("Out of memory.");
2468                 return -ENOMEM;
2469         }
2470
2471         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2472         if (s->epoll_fd < 0) {
2473                 log_error("Failed to create epoll object: %m");
2474                 return -errno;
2475         }
2476
2477         n = sd_listen_fds(true);
2478         if (n < 0) {
2479                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2480                 return n;
2481         }
2482
2483         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2484
2485                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2486
2487                         if (s->native_fd >= 0) {
2488                                 log_error("Too many native sockets passed.");
2489                                 return -EINVAL;
2490                         }
2491
2492                         s->native_fd = fd;
2493
2494                 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2495
2496                         if (s->stdout_fd >= 0) {
2497                                 log_error("Too many stdout sockets passed.");
2498                                 return -EINVAL;
2499                         }
2500
2501                         s->stdout_fd = fd;
2502
2503                 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2504
2505                         if (s->syslog_fd >= 0) {
2506                                 log_error("Too many /dev/log sockets passed.");
2507                                 return -EINVAL;
2508                         }
2509
2510                         s->syslog_fd = fd;
2511
2512                 } else {
2513                         log_error("Unknown socket passed.");
2514                         return -EINVAL;
2515                 }
2516         }
2517
2518         r = open_syslog_socket(s);
2519         if (r < 0)
2520                 return r;
2521
2522         r = open_native_socket(s);
2523         if (r < 0)
2524                 return r;
2525
2526         r = open_stdout_socket(s);
2527         if (r < 0)
2528                 return r;
2529
2530         r = open_proc_kmsg(s);
2531         if (r < 0)
2532                 return r;
2533
2534         r = system_journal_open(s);
2535         if (r < 0)
2536                 return r;
2537
2538         r = open_signalfd(s);
2539         if (r < 0)
2540                 return r;
2541
2542         s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2543         if (!s->rate_limit)
2544                 return -ENOMEM;
2545
2546         return 0;
2547 }
2548
2549 static void server_done(Server *s) {
2550         JournalFile *f;
2551         assert(s);
2552
2553         while (s->stdout_streams)
2554                 stdout_stream_free(s->stdout_streams);
2555
2556         if (s->system_journal)
2557                 journal_file_close(s->system_journal);
2558
2559         if (s->runtime_journal)
2560                 journal_file_close(s->runtime_journal);
2561
2562         while ((f = hashmap_steal_first(s->user_journals)))
2563                 journal_file_close(f);
2564
2565         hashmap_free(s->user_journals);
2566
2567         if (s->epoll_fd >= 0)
2568                 close_nointr_nofail(s->epoll_fd);
2569
2570         if (s->signal_fd >= 0)
2571                 close_nointr_nofail(s->signal_fd);
2572
2573         if (s->syslog_fd >= 0)
2574                 close_nointr_nofail(s->syslog_fd);
2575
2576         if (s->native_fd >= 0)
2577                 close_nointr_nofail(s->native_fd);
2578
2579         if (s->stdout_fd >= 0)
2580                 close_nointr_nofail(s->stdout_fd);
2581
2582         if (s->proc_kmsg_fd >= 0)
2583                 close_nointr_nofail(s->proc_kmsg_fd);
2584
2585         if (s->rate_limit)
2586                 journal_rate_limit_free(s->rate_limit);
2587
2588         free(s->buffer);
2589 }
2590
2591 int main(int argc, char *argv[]) {
2592         Server server;
2593         int r;
2594
2595         /* if (getppid() != 1) { */
2596         /*         log_error("This program should be invoked by init only."); */
2597         /*         return EXIT_FAILURE; */
2598         /* } */
2599
2600         if (argc > 1) {
2601                 log_error("This program does not take arguments.");
2602                 return EXIT_FAILURE;
2603         }
2604
2605         log_set_target(LOG_TARGET_CONSOLE);
2606         log_parse_environment();
2607         log_open();
2608
2609         umask(0022);
2610
2611         r = server_init(&server);
2612         if (r < 0)
2613                 goto finish;
2614
2615         server_vacuum(&server);
2616         server_flush_to_var(&server);
2617         server_flush_proc_kmsg(&server);
2618
2619         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2620         driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2621
2622         sd_notify(false,
2623                   "READY=1\n"
2624                   "STATUS=Processing requests...");
2625
2626         for (;;) {
2627                 struct epoll_event event;
2628
2629                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2630                 if (r < 0) {
2631
2632                         if (errno == EINTR)
2633                                 continue;
2634
2635                         log_error("epoll_wait() failed: %m");
2636                         r = -errno;
2637                         goto finish;
2638                 } else if (r == 0)
2639                         break;
2640
2641                 r = process_event(&server, &event);
2642                 if (r < 0)
2643                         goto finish;
2644                 else if (r == 0)
2645                         break;
2646         }
2647
2648         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2649         driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2650
2651 finish:
2652         sd_notify(false,
2653                   "STATUS=Shutting down...");
2654
2655         server_done(&server);
2656
2657         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
2658 }