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 #include <sys/user.h>
  33
  34 #include <systemd/sd-journal.h>
  35 #include <systemd/sd-login.h>
  36 #include <systemd/sd-messages.h>
  37 #include <systemd/sd-daemon.h>
  38
  39 #include "hashmap.h"
  40 #include "journal-file.h"
  41 #include "socket-util.h"
  42 #include "cgroup-util.h"
  43 #include "list.h"
  44 #include "journal-rate-limit.h"
  45 #include "journal-internal.h"
  46 #include "conf-parser.h"
  47 #include "journald.h"
  48 #include "virt.h"
  49 #include "missing.h"
  50
  51 #ifdef HAVE_ACL
  52 #include <sys/acl.h>
  53 #include <acl/libacl.h>
  54 #include "acl-util.h"
  55 #endif
  56
  57 #ifdef HAVE_SELINUX
  58 #include <selinux/selinux.h>
  59 #endif
  60
  61 #define USER_JOURNALS_MAX 1024
  62 #define STDOUT_STREAMS_MAX 4096
  63
  64 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
  65 #define DEFAULT_RATE_LIMIT_BURST 200
  66
  67 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
  68
  69 #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)
  70
  71 #define N_IOVEC_META_FIELDS 17
  72
  73 #define ENTRY_SIZE_MAX (1024*1024*32)
  74
  75 typedef enum StdoutStreamState {
  76         STDOUT_STREAM_IDENTIFIER,
  77         STDOUT_STREAM_PRIORITY,
  78         STDOUT_STREAM_LEVEL_PREFIX,
  79         STDOUT_STREAM_FORWARD_TO_SYSLOG,
  80         STDOUT_STREAM_FORWARD_TO_KMSG,
  81         STDOUT_STREAM_FORWARD_TO_CONSOLE,
  82         STDOUT_STREAM_RUNNING
  83 } StdoutStreamState;
  84
  85 struct StdoutStream {
  86         Server *server;
  87         StdoutStreamState state;
  88
  89         int fd;
  90
  91         struct ucred ucred;
  92 #ifdef HAVE_SELINUX
  93         security_context_t security_context;
  94 #endif
  95
  96         char *identifier;
  97         int priority;
  98         bool level_prefix:1;
  99         bool forward_to_syslog:1;
 100         bool forward_to_kmsg:1;
 101         bool forward_to_console:1;
 102
 103         char buffer[LINE_MAX+1];
 104         size_t length;
 105
 106         LIST_FIELDS(StdoutStream, stdout_stream);
 107 };
 108
 109 static int server_flush_to_var(Server *s);
 110
 111 static uint64_t available_space(Server *s) {
 112         char ids[33], *p;
 113         const char *f;
 114         sd_id128_t machine;
 115         struct statvfs ss;
 116         uint64_t sum = 0, avail = 0, ss_avail = 0;
 117         int r;
 118         DIR *d;
 119         usec_t ts;
 120         JournalMetrics *m;
 121
 122         ts = now(CLOCK_MONOTONIC);
 123
 124         if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
 125                 return s->cached_available_space;
 126
 127         r = sd_id128_get_machine(&machine);
 128         if (r < 0)
 129                 return 0;
 130
 131         if (s->system_journal) {
 132                 f = "/var/log/journal/";
 133                 m = &s->system_metrics;
 134         } else {
 135                 f = "/run/log/journal/";
 136                 m = &s->runtime_metrics;
 137         }
 138
 139         assert(m);
 140
 141         p = strappend(f, sd_id128_to_string(machine, ids));
 142         if (!p)
 143                 return 0;
 144
 145         d = opendir(p);
 146         free(p);
 147
 148         if (!d)
 149                 return 0;
 150
 151         if (fstatvfs(dirfd(d), &ss) < 0)
 152                 goto finish;
 153
 154         for (;;) {
 155                 struct stat st;
 156                 struct dirent buf, *de;
 157                 int k;
 158
 159                 k = readdir_r(d, &buf, &de);
 160                 if (k != 0) {
 161                         r = -k;
 162                         goto finish;
 163                 }
 164
 165                 if (!de)
 166                         break;
 167
 168                 if (!dirent_is_file_with_suffix(de, ".journal"))
 169                         continue;
 170
 171                 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
 172                         continue;
 173
 174                 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
 175         }
 176
 177         avail = sum >= m->max_use ? 0 : m->max_use - sum;
 178
 179         ss_avail = ss.f_bsize * ss.f_bavail;
 180
 181         ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
 182
 183         if (ss_avail < avail)
 184                 avail = ss_avail;
 185
 186         s->cached_available_space = avail;
 187         s->cached_available_space_timestamp = ts;
 188
 189 finish:
 190         closedir(d);
 191
 192         return avail;
 193 }
 194
 195 static void server_read_file_gid(Server *s) {
 196         const char *adm = "adm";
 197         int r;
 198
 199         assert(s);
 200
 201         if (s->file_gid_valid)
 202                 return;
 203
 204         r = get_group_creds(&adm, &s->file_gid);
 205         if (r < 0)
 206                 log_warning("Failed to resolve 'adm' group: %s", strerror(-r));
 207
 208         /* if we couldn't read the gid, then it will be 0, but that's
 209          * fine and we shouldn't try to resolve the group again, so
 210          * let's just pretend it worked right-away. */
 211         s->file_gid_valid = true;
 212 }
 213
 214 static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
 215         int r;
 216 #ifdef HAVE_ACL
 217         acl_t acl;
 218         acl_entry_t entry;
 219         acl_permset_t permset;
 220 #endif
 221
 222         assert(f);
 223
 224         server_read_file_gid(s);
 225
 226         r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
 227         if (r < 0)
 228                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
 229
 230 #ifdef HAVE_ACL
 231         if (uid <= 0)
 232                 return;
 233
 234         acl = acl_get_fd(f->fd);
 235         if (!acl) {
 236                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
 237                 return;
 238         }
 239
 240         r = acl_find_uid(acl, uid, &entry);
 241         if (r <= 0) {
 242
 243                 if (acl_create_entry(&acl, &entry) < 0 ||
 244                     acl_set_tag_type(entry, ACL_USER) < 0 ||
 245                     acl_set_qualifier(entry, &uid) < 0) {
 246                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 247                         goto finish;
 248                 }
 249         }
 250
 251         if (acl_get_permset(entry, &permset) < 0 ||
 252             acl_add_perm(permset, ACL_READ) < 0 ||
 253             acl_calc_mask(&acl) < 0) {
 254                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
 255                 goto finish;
 256         }
 257
 258         if (acl_set_fd(f->fd, acl) < 0)
 259                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
 260
 261 finish:
 262         acl_free(acl);
 263 #endif
 264 }
 265
 266 static JournalFile* find_journal(Server *s, uid_t uid) {
 267         char *p;
 268         int r;
 269         JournalFile *f;
 270         char ids[33];
 271         sd_id128_t machine;
 272
 273         assert(s);
 274
 275         /* We split up user logs only on /var, not on /run. If the
 276          * runtime file is open, we write to it exclusively, in order
 277          * to guarantee proper order as soon as we flush /run to
 278          * /var and close the runtime file. */
 279
 280         if (s->runtime_journal)
 281                 return s->runtime_journal;
 282
 283         if (uid <= 0)
 284                 return s->system_journal;
 285
 286         r = sd_id128_get_machine(&machine);
 287         if (r < 0)
 288                 return s->system_journal;
 289
 290         f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
 291         if (f)
 292                 return f;
 293
 294         if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
 295                 return s->system_journal;
 296
 297         while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
 298                 /* Too many open? Then let's close one */
 299                 f = hashmap_steal_first(s->user_journals);
 300                 assert(f);
 301                 journal_file_close(f);
 302         }
 303
 304         r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
 305         free(p);
 306
 307         if (r < 0)
 308                 return s->system_journal;
 309
 310         server_fix_perms(s, f, uid);
 311         f->metrics = s->system_metrics;
 312         f->compress = s->compress;
 313
 314         r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
 315         if (r < 0) {
 316                 journal_file_close(f);
 317                 return s->system_journal;
 318         }
 319
 320         return f;
 321 }
 322
 323 static void server_rotate(Server *s) {
 324         JournalFile *f;
 325         void *k;
 326         Iterator i;
 327         int r;
 328
 329         log_info("Rotating...");
 330
 331         if (s->runtime_journal) {
 332                 r = journal_file_rotate(&s->runtime_journal);
 333                 if (r < 0)
 334                         log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
 335         }
 336
 337         if (s->system_journal) {
 338                 r = journal_file_rotate(&s->system_journal);
 339                 if (r < 0)
 340                         log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
 341         }
 342
 343         HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
 344                 r = journal_file_rotate(&f);
 345                 if (r < 0)
 346                         log_error("Failed to rotate %s: %s", f->path, strerror(-r));
 347                 else
 348                         hashmap_replace(s->user_journals, k, f);
 349         }
 350 }
 351
 352 static void server_vacuum(Server *s) {
 353         char *p;
 354         char ids[33];
 355         sd_id128_t machine;
 356         int r;
 357
 358         log_info("Vacuuming...");
 359
 360         r = sd_id128_get_machine(&machine);
 361         if (r < 0) {
 362                 log_error("Failed to get machine ID: %s", strerror(-r));
 363                 return;
 364         }
 365
 366         sd_id128_to_string(machine, ids);
 367
 368         if (s->system_journal) {
 369                 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
 370                         log_error("Out of memory.");
 371                         return;
 372                 }
 373
 374                 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
 375                 if (r < 0 && r != -ENOENT)
 376                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
 377                 free(p);
 378         }
 379
 380
 381         if (s->runtime_journal) {
 382                 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
 383                         log_error("Out of memory.");
 384                         return;
 385                 }
 386
 387                 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
 388                 if (r < 0 && r != -ENOENT)
 389                         log_error("Failed to vacuum %s: %s", p, strerror(-r));
 390                 free(p);
 391         }
 392
 393         s->cached_available_space_timestamp = 0;
 394 }
 395
 396 static char *shortened_cgroup_path(pid_t pid) {
 397         int r;
 398         char *process_path, *init_path, *path;
 399
 400         assert(pid > 0);
 401
 402         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
 403         if (r < 0)
 404                 return NULL;
 405
 406         r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
 407         if (r < 0) {
 408                 free(process_path);
 409                 return NULL;
 410         }
 411
 412         if (endswith(init_path, "/system"))
 413                 init_path[strlen(init_path) - 7] = 0;
 414         else if (streq(init_path, "/"))
 415                 init_path[0] = 0;
 416
 417         if (startswith(process_path, init_path)) {
 418                 char *p;
 419
 420                 p = strdup(process_path + strlen(init_path));
 421                 if (!p) {
 422                         free(process_path);
 423                         free(init_path);
 424                         return NULL;
 425                 }
 426                 path = p;
 427         } else {
 428                 path = process_path;
 429                 process_path = NULL;
 430         }
 431
 432         free(process_path);
 433         free(init_path);
 434
 435         return path;
 436 }
 437
 438 static void dispatch_message_real(
 439                 Server *s,
 440                 struct iovec *iovec, unsigned n, unsigned m,
 441                 struct ucred *ucred,
 442                 struct timeval *tv,
 443                 const char *label, size_t label_len) {
 444
 445         char *pid = NULL, *uid = NULL, *gid = NULL,
 446                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 447                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 448                 *audit_session = NULL, *audit_loginuid = NULL,
 449                 *exe = NULL, *cgroup = NULL, *session = NULL,
 450                 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
 451
 452         char idbuf[33];
 453         sd_id128_t id;
 454         int r;
 455         char *t;
 456         uid_t loginuid = 0, realuid = 0;
 457         JournalFile *f;
 458         bool vacuumed = false;
 459
 460         assert(s);
 461         assert(iovec);
 462         assert(n > 0);
 463         assert(n + N_IOVEC_META_FIELDS <= m);
 464
 465         if (ucred) {
 466                 uint32_t audit;
 467                 uid_t owner;
 468
 469                 realuid = ucred->uid;
 470
 471                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 472                         IOVEC_SET_STRING(iovec[n++], pid);
 473
 474                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 475                         IOVEC_SET_STRING(iovec[n++], uid);
 476
 477                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 478                         IOVEC_SET_STRING(iovec[n++], gid);
 479
 480                 r = get_process_comm(ucred->pid, &t);
 481                 if (r >= 0) {
 482                         comm = strappend("_COMM=", t);
 483                         free(t);
 484
 485                         if (comm)
 486                                 IOVEC_SET_STRING(iovec[n++], comm);
 487                 }
 488
 489                 r = get_process_exe(ucred->pid, &t);
 490                 if (r >= 0) {
 491                         exe = strappend("_EXE=", t);
 492                         free(t);
 493
 494                         if (exe)
 495                                 IOVEC_SET_STRING(iovec[n++], exe);
 496                 }
 497
 498                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 499                 if (r >= 0) {
 500                         cmdline = strappend("_CMDLINE=", t);
 501                         free(t);
 502
 503                         if (cmdline)
 504                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 505                 }
 506
 507                 r = audit_session_from_pid(ucred->pid, &audit);
 508                 if (r >= 0)
 509                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
 510                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 511
 512                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 513                 if (r >= 0)
 514                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 515                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 516
 517                 t = shortened_cgroup_path(ucred->pid);
 518                 if (t) {
 519                         cgroup = strappend("_SYSTEMD_CGROUP=", t);
 520                         free(t);
 521
 522                         if (cgroup)
 523                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 524                 }
 525
 526                 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
 527                         session = strappend("_SYSTEMD_SESSION=", t);
 528                         free(t);
 529
 530                         if (session)
 531                                 IOVEC_SET_STRING(iovec[n++], session);
 532                 }
 533
 534                 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
 535                         unit = strappend("_SYSTEMD_UNIT=", t);
 536                         free(t);
 537
 538                         if (unit)
 539                                 IOVEC_SET_STRING(iovec[n++], unit);
 540                 }
 541
 542                 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
 543                         if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
 544                                 IOVEC_SET_STRING(iovec[n++], owner_uid);
 545
 546 #ifdef HAVE_SELINUX
 547                 if (label) {
 548                         selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len);
 549                         if (selinux_context) {
 550                                 memcpy(selinux_context, "_SELINUX_CONTEXT=", sizeof("_SELINUX_CONTEXT=")-1);
 551                                 memcpy(selinux_context+sizeof("_SELINUX_CONTEXT=")-1, label, label_len);
 552                                 selinux_context[sizeof("_SELINUX_CONTEXT=")-1+label_len] = 0;
 553                                 IOVEC_SET_STRING(iovec[n++], selinux_context);
 554                         }
 555                 } else {
 556                         security_context_t con;
 557
 558                         if (getpidcon(ucred->pid, &con) >= 0) {
 559                                 selinux_context = strappend("_SELINUX_CONTEXT=", con);
 560                                 if (selinux_context)
 561                                         IOVEC_SET_STRING(iovec[n++], selinux_context);
 562
 563                                 freecon(con);
 564                         }
 565                 }
 566 #endif
 567         }
 568
 569         if (tv) {
 570                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 571                              (unsigned long long) timeval_load(tv)) >= 0)
 572                         IOVEC_SET_STRING(iovec[n++], source_time);
 573         }
 574
 575         /* Note that strictly speaking storing the boot id here is
 576          * redundant since the entry includes this in-line
 577          * anyway. However, we need this indexed, too. */
 578         r = sd_id128_get_boot(&id);
 579         if (r >= 0)
 580                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 581                         IOVEC_SET_STRING(iovec[n++], boot_id);
 582
 583         r = sd_id128_get_machine(&id);
 584         if (r >= 0)
 585                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 586                         IOVEC_SET_STRING(iovec[n++], machine_id);
 587
 588         t = gethostname_malloc();
 589         if (t) {
 590                 hostname = strappend("_HOSTNAME=", t);
 591                 free(t);
 592                 if (hostname)
 593                         IOVEC_SET_STRING(iovec[n++], hostname);
 594         }
 595
 596         assert(n <= m);
 597
 598         server_flush_to_var(s);
 599
 600 retry:
 601         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 602         if (!f)
 603                 log_warning("Dropping message, as we can't find a place to store the data.");
 604         else {
 605                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 606
 607                 if ((r == -EBADMSG || r == -E2BIG) && !vacuumed) {
 608
 609                         if (r == -E2BIG)
 610                                 log_info("Allocation limit reached, rotating.");
 611                         else
 612                                 log_warning("Journal file corrupted, rotating.");
 613
 614                         server_rotate(s);
 615                         server_vacuum(s);
 616                         vacuumed = true;
 617
 618                         log_info("Retrying write.");
 619                         goto retry;
 620                 }
 621
 622                 if (r < 0)
 623                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 624         }
 625
 626         free(pid);
 627         free(uid);
 628         free(gid);
 629         free(comm);
 630         free(exe);
 631         free(cmdline);
 632         free(source_time);
 633         free(boot_id);
 634         free(machine_id);
 635         free(hostname);
 636         free(audit_session);
 637         free(audit_loginuid);
 638         free(cgroup);
 639         free(session);
 640         free(owner_uid);
 641         free(unit);
 642         free(selinux_context);
 643 }
 644
 645 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
 646         char mid[11 + 32 + 1];
 647         char buffer[16 + LINE_MAX + 1];
 648         struct iovec iovec[N_IOVEC_META_FIELDS + 4];
 649         int n = 0;
 650         va_list ap;
 651         struct ucred ucred;
 652
 653         assert(s);
 654         assert(format);
 655
 656         IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
 657         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
 658
 659         memcpy(buffer, "MESSAGE=", 8);
 660         va_start(ap, format);
 661         vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
 662         va_end(ap);
 663         char_array_0(buffer);
 664         IOVEC_SET_STRING(iovec[n++], buffer);
 665
 666         snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
 667         char_array_0(mid);
 668         IOVEC_SET_STRING(iovec[n++], mid);
 669
 670         zero(ucred);
 671         ucred.pid = getpid();
 672         ucred.uid = getuid();
 673         ucred.gid = getgid();
 674
 675         dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0);
 676 }
 677
 678 static void dispatch_message(Server *s,
 679                              struct iovec *iovec, unsigned n, unsigned m,
 680                              struct ucred *ucred,
 681                              struct timeval *tv,
 682                              const char *label, size_t label_len,
 683                              int priority) {
 684         int rl;
 685         char *path = NULL, *c;
 686
 687         assert(s);
 688         assert(iovec || n == 0);
 689
 690         if (n == 0)
 691                 return;
 692
 693         if (!ucred)
 694                 goto finish;
 695
 696         path = shortened_cgroup_path(ucred->pid);
 697         if (!path)
 698                 goto finish;
 699
 700         /* example: /user/lennart/3/foobar
 701          *          /system/dbus.service/foobar
 702          *
 703          * So let's cut of everything past the third /, since that is
 704          * wher user directories start */
 705
 706         c = strchr(path, '/');
 707         if (c) {
 708                 c = strchr(c+1, '/');
 709                 if (c) {
 710                         c = strchr(c+1, '/');
 711                         if (c)
 712                                 *c = 0;
 713                 }
 714         }
 715
 716         rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
 717
 718         if (rl == 0) {
 719                 free(path);
 720                 return;
 721         }
 722
 723         /* Write a suppression message if we suppressed something */
 724         if (rl > 1)
 725                 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
 726
 727         free(path);
 728
 729 finish:
 730         dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len);
 731 }
 732
 733 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
 734         struct msghdr msghdr;
 735         struct cmsghdr *cmsg;
 736         union {
 737                 struct cmsghdr cmsghdr;
 738                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
 739         } control;
 740         union sockaddr_union sa;
 741
 742         assert(s);
 743         assert(iovec);
 744         assert(n_iovec > 0);
 745
 746         zero(msghdr);
 747         msghdr.msg_iov = (struct iovec*) iovec;
 748         msghdr.msg_iovlen = n_iovec;
 749
 750         zero(sa);
 751         sa.un.sun_family = AF_UNIX;
 752         strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
 753         msghdr.msg_name = &sa;
 754         msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
 755
 756         if (ucred) {
 757                 zero(control);
 758                 msghdr.msg_control = &control;
 759                 msghdr.msg_controllen = sizeof(control);
 760
 761                 cmsg = CMSG_FIRSTHDR(&msghdr);
 762                 cmsg->cmsg_level = SOL_SOCKET;
 763                 cmsg->cmsg_type = SCM_CREDENTIALS;
 764                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
 765                 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
 766                 msghdr.msg_controllen = cmsg->cmsg_len;
 767         }
 768
 769         /* Forward the syslog message we received via /dev/log to
 770          * /run/systemd/syslog. Unfortunately we currently can't set
 771          * the SO_TIMESTAMP auxiliary data, and hence we don't. */
 772
 773         if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
 774                 return;
 775
 776         /* The socket is full? I guess the syslog implementation is
 777          * too slow, and we shouldn't wait for that... */
 778         if (errno == EAGAIN)
 779                 return;
 780
 781         if (ucred && errno == ESRCH) {
 782                 struct ucred u;
 783
 784                 /* Hmm, presumably the sender process vanished
 785                  * by now, so let's fix it as good as we
 786                  * can, and retry */
 787
 788                 u = *ucred;
 789                 u.pid = getpid();
 790                 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
 791
 792                 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
 793                         return;
 794
 795                 if (errno == EAGAIN)
 796                         return;
 797         }
 798
 799         log_debug("Failed to forward syslog message: %m");
 800 }
 801
 802 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
 803         struct iovec iovec;
 804
 805         assert(s);
 806         assert(buffer);
 807
 808         IOVEC_SET_STRING(iovec, buffer);
 809         forward_syslog_iovec(s, &iovec, 1, ucred, tv);
 810 }
 811
 812 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
 813         struct iovec iovec[5];
 814         char header_priority[6], header_time[64], header_pid[16];
 815         int n = 0;
 816         time_t t;
 817         struct tm *tm;
 818         char *ident_buf = NULL;
 819
 820         assert(s);
 821         assert(priority >= 0);
 822         assert(priority <= 999);
 823         assert(message);
 824
 825         /* First: priority field */
 826         snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
 827         char_array_0(header_priority);
 828         IOVEC_SET_STRING(iovec[n++], header_priority);
 829
 830         /* Second: timestamp */
 831         t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
 832         tm = localtime(&t);
 833         if (!tm)
 834                 return;
 835         if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
 836                 return;
 837         IOVEC_SET_STRING(iovec[n++], header_time);
 838
 839         /* Third: identifier and PID */
 840         if (ucred) {
 841                 if (!identifier) {
 842                         get_process_comm(ucred->pid, &ident_buf);
 843                         identifier = ident_buf;
 844                 }
 845
 846                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 847                 char_array_0(header_pid);
 848
 849                 if (identifier)
 850                         IOVEC_SET_STRING(iovec[n++], identifier);
 851
 852                 IOVEC_SET_STRING(iovec[n++], header_pid);
 853         } else if (identifier) {
 854                 IOVEC_SET_STRING(iovec[n++], identifier);
 855                 IOVEC_SET_STRING(iovec[n++], ": ");
 856         }
 857
 858         /* Fourth: message */
 859         IOVEC_SET_STRING(iovec[n++], message);
 860
 861         forward_syslog_iovec(s, iovec, n, ucred, tv);
 862
 863         free(ident_buf);
 864 }
 865
 866 static int fixup_priority(int priority) {
 867
 868         if ((priority & LOG_FACMASK) == 0)
 869                 return (priority & LOG_PRIMASK) | LOG_USER;
 870
 871         return priority;
 872 }
 873
 874 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
 875         struct iovec iovec[5];
 876         char header_priority[6], header_pid[16];
 877         int n = 0;
 878         char *ident_buf = NULL;
 879         int fd;
 880
 881         assert(s);
 882         assert(priority >= 0);
 883         assert(priority <= 999);
 884         assert(message);
 885
 886         /* Never allow messages with kernel facility to be written to
 887          * kmsg, regardless where the data comes from. */
 888         priority = fixup_priority(priority);
 889
 890         /* First: priority field */
 891         snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
 892         char_array_0(header_priority);
 893         IOVEC_SET_STRING(iovec[n++], header_priority);
 894
 895         /* Second: identifier and PID */
 896         if (ucred) {
 897                 if (!identifier) {
 898                         get_process_comm(ucred->pid, &ident_buf);
 899                         identifier = ident_buf;
 900                 }
 901
 902                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 903                 char_array_0(header_pid);
 904
 905                 if (identifier)
 906                         IOVEC_SET_STRING(iovec[n++], identifier);
 907
 908                 IOVEC_SET_STRING(iovec[n++], header_pid);
 909         } else if (identifier) {
 910                 IOVEC_SET_STRING(iovec[n++], identifier);
 911                 IOVEC_SET_STRING(iovec[n++], ": ");
 912         }
 913
 914         /* Fourth: message */
 915         IOVEC_SET_STRING(iovec[n++], message);
 916         IOVEC_SET_STRING(iovec[n++], "\n");
 917
 918         fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 919         if (fd < 0) {
 920                 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
 921                 goto finish;
 922         }
 923
 924         if (writev(fd, iovec, n) < 0)
 925                 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
 926
 927         close_nointr_nofail(fd);
 928
 929 finish:
 930         free(ident_buf);
 931 }
 932
 933 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
 934         struct iovec iovec[4];
 935         char header_pid[16];
 936         int n = 0, fd;
 937         char *ident_buf = NULL;
 938
 939         assert(s);
 940         assert(message);
 941
 942         /* First: identifier and PID */
 943         if (ucred) {
 944                 if (!identifier) {
 945                         get_process_comm(ucred->pid, &ident_buf);
 946                         identifier = ident_buf;
 947                 }
 948
 949                 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
 950                 char_array_0(header_pid);
 951
 952                 if (identifier)
 953                         IOVEC_SET_STRING(iovec[n++], identifier);
 954
 955                 IOVEC_SET_STRING(iovec[n++], header_pid);
 956         } else if (identifier) {
 957                 IOVEC_SET_STRING(iovec[n++], identifier);
 958                 IOVEC_SET_STRING(iovec[n++], ": ");
 959         }
 960
 961         /* Third: message */
 962         IOVEC_SET_STRING(iovec[n++], message);
 963         IOVEC_SET_STRING(iovec[n++], "\n");
 964
 965         fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 966         if (fd < 0) {
 967                 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
 968                 goto finish;
 969         }
 970
 971         if (writev(fd, iovec, n) < 0)
 972                 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
 973
 974         close_nointr_nofail(fd);
 975
 976 finish:
 977         free(ident_buf);
 978 }
 979
 980 static void read_identifier(const char **buf, char **identifier, char **pid) {
 981         const char *p;
 982         char *t;
 983         size_t l, e;
 984
 985         assert(buf);
 986         assert(identifier);
 987         assert(pid);
 988
 989         p = *buf;
 990
 991         p += strspn(p, WHITESPACE);
 992         l = strcspn(p, WHITESPACE);
 993
 994         if (l <= 0 ||
 995             p[l-1] != ':')
 996                 return;
 997
 998         e = l;
 999         l--;
1000
1001         if (p[l-1] == ']') {
1002                 size_t k = l-1;
1003
1004                 for (;;) {
1005
1006                         if (p[k] == '[') {
1007                                 t = strndup(p+k+1, l-k-2);
1008                                 if (t)
1009                                         *pid = t;
1010
1011                                 l = k;
1012                                 break;
1013                         }
1014
1015                         if (k == 0)
1016                                 break;
1017
1018                         k--;
1019                 }
1020         }
1021
1022         t = strndup(p, l);
1023         if (t)
1024                 *identifier = t;
1025
1026         *buf = p + e;
1027         *buf += strspn(*buf, WHITESPACE);
1028 }
1029
1030 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len) {
1031         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
1032         struct iovec iovec[N_IOVEC_META_FIELDS + 6];
1033         unsigned n = 0;
1034         int priority = LOG_USER | LOG_INFO;
1035         char *identifier = NULL, *pid = NULL;
1036
1037         assert(s);
1038         assert(buf);
1039
1040         if (s->forward_to_syslog)
1041                 forward_syslog_raw(s, buf, ucred, tv);
1042
1043         parse_syslog_priority((char**) &buf, &priority);
1044         skip_syslog_date((char**) &buf);
1045         read_identifier(&buf, &identifier, &pid);
1046
1047         if (s->forward_to_kmsg)
1048                 forward_kmsg(s, priority, identifier, buf, ucred);
1049
1050         if (s->forward_to_console)
1051                 forward_console(s, identifier, buf, ucred);
1052
1053         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
1054
1055         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1056                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1057
1058         if (priority & LOG_FACMASK)
1059                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1060                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1061
1062         if (identifier) {
1063                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1064                 if (syslog_identifier)
1065                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1066         }
1067
1068         if (pid) {
1069                 syslog_pid = strappend("SYSLOG_PID=", pid);
1070                 if (syslog_pid)
1071                         IOVEC_SET_STRING(iovec[n++], syslog_pid);
1072         }
1073
1074         message = strappend("MESSAGE=", buf);
1075         if (message)
1076                 IOVEC_SET_STRING(iovec[n++], message);
1077
1078         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, priority);
1079
1080         free(message);
1081         free(identifier);
1082         free(pid);
1083         free(syslog_priority);
1084         free(syslog_facility);
1085         free(syslog_identifier);
1086 }
1087
1088 static bool valid_user_field(const char *p, size_t l) {
1089         const char *a;
1090
1091         /* We kinda enforce POSIX syntax recommendations for
1092            environment variables here, but make a couple of additional
1093            requirements.
1094
1095            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1096
1097         /* No empty field names */
1098         if (l <= 0)
1099                 return false;
1100
1101         /* Don't allow names longer than 64 chars */
1102         if (l > 64)
1103                 return false;
1104
1105         /* Variables starting with an underscore are protected */
1106         if (p[0] == '_')
1107                 return false;
1108
1109         /* Don't allow digits as first character */
1110         if (p[0] >= '0' && p[0] <= '9')
1111                 return false;
1112
1113         /* Only allow A-Z0-9 and '_' */
1114         for (a = p; a < p + l; a++)
1115                 if (!((*a >= 'A' && *a <= 'Z') ||
1116                       (*a >= '0' && *a <= '9') ||
1117                       *a == '_'))
1118                         return false;
1119
1120         return true;
1121 }
1122
1123 static void process_native_message(
1124                 Server *s,
1125                 const void *buffer, size_t buffer_size,
1126                 struct ucred *ucred,
1127                 struct timeval *tv,
1128                 const char *label, size_t label_len) {
1129
1130         struct iovec *iovec = NULL;
1131         unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1132         const char *p;
1133         size_t remaining;
1134         int priority = LOG_INFO;
1135         char *identifier = NULL, *message = NULL;
1136
1137         assert(s);
1138         assert(buffer || n == 0);
1139
1140         p = buffer;
1141         remaining = buffer_size;
1142
1143         while (remaining > 0) {
1144                 const char *e, *q;
1145
1146                 e = memchr(p, '\n', remaining);
1147
1148                 if (!e) {
1149                         /* Trailing noise, let's ignore it, and flush what we collected */
1150                         log_debug("Received message with trailing noise, ignoring.");
1151                         break;
1152                 }
1153
1154                 if (e == p) {
1155                         /* Entry separator */
1156                         dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1157                         n = 0;
1158                         priority = LOG_INFO;
1159
1160                         p++;
1161                         remaining--;
1162                         continue;
1163                 }
1164
1165                 if (*p == '.' || *p == '#') {
1166                         /* Ignore control commands for now, and
1167                          * comments too. */
1168                         remaining -= (e - p) + 1;
1169                         p = e + 1;
1170                         continue;
1171                 }
1172
1173                 /* A property follows */
1174
1175                 if (n+N_IOVEC_META_FIELDS >= m) {
1176                         struct iovec *c;
1177                         unsigned u;
1178
1179                         u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1180                         c = realloc(iovec, u * sizeof(struct iovec));
1181                         if (!c) {
1182                                 log_error("Out of memory");
1183                                 break;
1184                         }
1185
1186                         iovec = c;
1187                         m = u;
1188                 }
1189
1190                 q = memchr(p, '=', e - p);
1191                 if (q) {
1192                         if (valid_user_field(p, q - p)) {
1193                                 size_t l;
1194
1195                                 l = e - p;
1196
1197                                 /* If the field name starts with an
1198                                  * underscore, skip the variable,
1199                                  * since that indidates a trusted
1200                                  * field */
1201                                 iovec[n].iov_base = (char*) p;
1202                                 iovec[n].iov_len = l;
1203                                 n++;
1204
1205                                 /* We need to determine the priority
1206                                  * of this entry for the rate limiting
1207                                  * logic */
1208                                 if (l == 10 &&
1209                                     memcmp(p, "PRIORITY=", 9) == 0 &&
1210                                     p[9] >= '0' && p[9] <= '9')
1211                                         priority = (priority & LOG_FACMASK) | (p[9] - '0');
1212
1213                                 else if (l == 17 &&
1214                                          memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1215                                          p[16] >= '0' && p[16] <= '9')
1216                                         priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1217
1218                                 else if (l == 18 &&
1219                                          memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1220                                          p[16] >= '0' && p[16] <= '9' &&
1221                                          p[17] >= '0' && p[17] <= '9')
1222                                         priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1223
1224                                 else if (l >= 12 &&
1225                                          memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1226                                         char *t;
1227
1228                                         t = strndup(p + 11, l - 11);
1229                                         if (t) {
1230                                                 free(identifier);
1231                                                 identifier = t;
1232                                         }
1233                                 } else if (l >= 8 &&
1234                                            memcmp(p, "MESSAGE=", 8) == 0) {
1235                                         char *t;
1236
1237                                         t = strndup(p + 8, l - 8);
1238                                         if (t) {
1239                                                 free(message);
1240                                                 message = t;
1241                                         }
1242                                 }
1243                         }
1244
1245                         remaining -= (e - p) + 1;
1246                         p = e + 1;
1247                         continue;
1248                 } else {
1249                         uint64_t l;
1250                         char *k;
1251
1252                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1253                                 log_debug("Failed to parse message, ignoring.");
1254                                 break;
1255                         }
1256
1257                         memcpy(&l, e + 1, sizeof(uint64_t));
1258                         l = le64toh(l);
1259
1260                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1261                             e[1+sizeof(uint64_t)+l] != '\n') {
1262                                 log_debug("Failed to parse message, ignoring.");
1263                                 break;
1264                         }
1265
1266                         k = malloc((e - p) + 1 + l);
1267                         if (!k) {
1268                                 log_error("Out of memory");
1269                                 break;
1270                         }
1271
1272                         memcpy(k, p, e - p);
1273                         k[e - p] = '=';
1274                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1275
1276                         if (valid_user_field(p, e - p)) {
1277                                 iovec[n].iov_base = k;
1278                                 iovec[n].iov_len = (e - p) + 1 + l;
1279                                 n++;
1280                         } else
1281                                 free(k);
1282
1283                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1284                         p = e + 1 + sizeof(uint64_t) + l + 1;
1285                 }
1286         }
1287
1288         if (n <= 0)
1289                 goto finish;
1290
1291         tn = n++;
1292         IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1293
1294         if (message) {
1295                 if (s->forward_to_syslog)
1296                         forward_syslog(s, priority, identifier, message, ucred, tv);
1297
1298                 if (s->forward_to_kmsg)
1299                         forward_kmsg(s, priority, identifier, message, ucred);
1300
1301                 if (s->forward_to_console)
1302                         forward_console(s, identifier, message, ucred);
1303         }
1304
1305         dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1306
1307 finish:
1308         for (j = 0; j < n; j++)  {
1309                 if (j == tn)
1310                         continue;
1311
1312                 if (iovec[j].iov_base < buffer ||
1313                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1314                         free(iovec[j].iov_base);
1315         }
1316
1317         free(iovec);
1318         free(identifier);
1319         free(message);
1320 }
1321
1322 static void process_native_file(
1323                 Server *s,
1324                 int fd,
1325                 struct ucred *ucred,
1326                 struct timeval *tv,
1327                 const char *label, size_t label_len) {
1328
1329         struct stat st;
1330         void *p;
1331         ssize_t n;
1332
1333         assert(s);
1334         assert(fd >= 0);
1335
1336         /* Data is in the passed file, since it didn't fit in a
1337          * datagram. We can't map the file here, since clients might
1338          * then truncate it and trigger a SIGBUS for us. So let's
1339          * stupidly read it */
1340
1341         if (fstat(fd, &st) < 0) {
1342                 log_error("Failed to stat passed file, ignoring: %m");
1343                 return;
1344         }
1345
1346         if (!S_ISREG(st.st_mode)) {
1347                 log_error("File passed is not regular. Ignoring.");
1348                 return;
1349         }
1350
1351         if (st.st_size <= 0)
1352                 return;
1353
1354         if (st.st_size > ENTRY_SIZE_MAX) {
1355                 log_error("File passed too large. Ignoring.");
1356                 return;
1357         }
1358
1359         p = malloc(st.st_size);
1360         if (!p) {
1361                 log_error("Out of memory");
1362                 return;
1363         }
1364
1365         n = pread(fd, p, st.st_size, 0);
1366         if (n < 0)
1367                 log_error("Failed to read file, ignoring: %s", strerror(-n));
1368         else if (n > 0)
1369                 process_native_message(s, p, n, ucred, tv, label, label_len);
1370
1371         free(p);
1372 }
1373
1374 static int stdout_stream_log(StdoutStream *s, const char *p) {
1375         struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1376         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1377         unsigned n = 0;
1378         int priority;
1379         char *label = NULL;
1380         size_t label_len = 0;
1381
1382         assert(s);
1383         assert(p);
1384
1385         if (isempty(p))
1386                 return 0;
1387
1388         priority = s->priority;
1389
1390         if (s->level_prefix)
1391                 parse_syslog_priority((char**) &p, &priority);
1392
1393         if (s->forward_to_syslog || s->server->forward_to_syslog)
1394                 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1395
1396         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1397                 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1398
1399         if (s->forward_to_console || s->server->forward_to_console)
1400                 forward_console(s->server, s->identifier, p, &s->ucred);
1401
1402         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1403
1404         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1405                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1406
1407         if (priority & LOG_FACMASK)
1408                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1409                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1410
1411         if (s->identifier) {
1412                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1413                 if (syslog_identifier)
1414                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1415         }
1416
1417         message = strappend("MESSAGE=", p);
1418         if (message)
1419                 IOVEC_SET_STRING(iovec[n++], message);
1420
1421 #ifdef HAVE_SELINUX
1422         if (s->security_context) {
1423                 label = (char*) s->security_context;
1424                 label_len = strlen((char*) s->security_context);
1425         }
1426 #endif
1427
1428         dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, priority);
1429
1430         free(message);
1431         free(syslog_priority);
1432         free(syslog_facility);
1433         free(syslog_identifier);
1434
1435         return 0;
1436 }
1437
1438 static int stdout_stream_line(StdoutStream *s, char *p) {
1439         int r;
1440
1441         assert(s);
1442         assert(p);
1443
1444         p = strstrip(p);
1445
1446         switch (s->state) {
1447
1448         case STDOUT_STREAM_IDENTIFIER:
1449                 if (isempty(p))
1450                         s->identifier = NULL;
1451                 else  {
1452                         s->identifier = strdup(p);
1453                         if (!s->identifier) {
1454                                 log_error("Out of memory");
1455                                 return -ENOMEM;
1456                         }
1457                 }
1458
1459                 s->state = STDOUT_STREAM_PRIORITY;
1460                 return 0;
1461
1462         case STDOUT_STREAM_PRIORITY:
1463                 r = safe_atoi(p, &s->priority);
1464                 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1465                         log_warning("Failed to parse log priority line.");
1466                         return -EINVAL;
1467                 }
1468
1469                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1470                 return 0;
1471
1472         case STDOUT_STREAM_LEVEL_PREFIX:
1473                 r = parse_boolean(p);
1474                 if (r < 0) {
1475                         log_warning("Failed to parse level prefix line.");
1476                         return -EINVAL;
1477                 }
1478
1479                 s->level_prefix = !!r;
1480                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1481                 return 0;
1482
1483         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1484                 r = parse_boolean(p);
1485                 if (r < 0) {
1486                         log_warning("Failed to parse forward to syslog line.");
1487                         return -EINVAL;
1488                 }
1489
1490                 s->forward_to_syslog = !!r;
1491                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1492                 return 0;
1493
1494         case STDOUT_STREAM_FORWARD_TO_KMSG:
1495                 r = parse_boolean(p);
1496                 if (r < 0) {
1497                         log_warning("Failed to parse copy to kmsg line.");
1498                         return -EINVAL;
1499                 }
1500
1501                 s->forward_to_kmsg = !!r;
1502                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1503                 return 0;
1504
1505         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1506                 r = parse_boolean(p);
1507                 if (r < 0) {
1508                         log_warning("Failed to parse copy to console line.");
1509                         return -EINVAL;
1510                 }
1511
1512                 s->forward_to_console = !!r;
1513                 s->state = STDOUT_STREAM_RUNNING;
1514                 return 0;
1515
1516         case STDOUT_STREAM_RUNNING:
1517                 return stdout_stream_log(s, p);
1518         }
1519
1520         assert_not_reached("Unknown stream state");
1521 }
1522
1523 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1524         char *p;
1525         size_t remaining;
1526         int r;
1527
1528         assert(s);
1529
1530         p = s->buffer;
1531         remaining = s->length;
1532         for (;;) {
1533                 char *end;
1534                 size_t skip;
1535
1536                 end = memchr(p, '\n', remaining);
1537                 if (end)
1538                         skip = end - p + 1;
1539                 else if (remaining >= sizeof(s->buffer) - 1) {
1540                         end = p + sizeof(s->buffer) - 1;
1541                         skip = remaining;
1542                 } else
1543                         break;
1544
1545                 *end = 0;
1546
1547                 r = stdout_stream_line(s, p);
1548                 if (r < 0)
1549                         return r;
1550
1551                 remaining -= skip;
1552                 p += skip;
1553         }
1554
1555         if (force_flush && remaining > 0) {
1556                 p[remaining] = 0;
1557                 r = stdout_stream_line(s, p);
1558                 if (r < 0)
1559                         return r;
1560
1561                 p += remaining;
1562                 remaining = 0;
1563         }
1564
1565         if (p > s->buffer) {
1566                 memmove(s->buffer, p, remaining);
1567                 s->length = remaining;
1568         }
1569
1570         return 0;
1571 }
1572
1573 static int stdout_stream_process(StdoutStream *s) {
1574         ssize_t l;
1575         int r;
1576
1577         assert(s);
1578
1579         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1580         if (l < 0) {
1581
1582                 if (errno == EAGAIN)
1583                         return 0;
1584
1585                 log_warning("Failed to read from stream: %m");
1586                 return -errno;
1587         }
1588
1589         if (l == 0) {
1590                 r = stdout_stream_scan(s, true);
1591                 if (r < 0)
1592                         return r;
1593
1594                 return 0;
1595         }
1596
1597         s->length += l;
1598         r = stdout_stream_scan(s, false);
1599         if (r < 0)
1600                 return r;
1601
1602         return 1;
1603
1604 }
1605
1606 static void stdout_stream_free(StdoutStream *s) {
1607         assert(s);
1608
1609         if (s->server) {
1610                 assert(s->server->n_stdout_streams > 0);
1611                 s->server->n_stdout_streams --;
1612                 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1613         }
1614
1615         if (s->fd >= 0) {
1616                 if (s->server)
1617                         epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1618
1619                 close_nointr_nofail(s->fd);
1620         }
1621
1622 #ifdef HAVE_SELINUX
1623         if (s->security_context)
1624                 freecon(s->security_context);
1625 #endif
1626
1627         free(s->identifier);
1628         free(s);
1629 }
1630
1631 static int stdout_stream_new(Server *s) {
1632         StdoutStream *stream;
1633         int fd, r;
1634         socklen_t len;
1635         struct epoll_event ev;
1636
1637         assert(s);
1638
1639         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1640         if (fd < 0) {
1641                 if (errno == EAGAIN)
1642                         return 0;
1643
1644                 log_error("Failed to accept stdout connection: %m");
1645                 return -errno;
1646         }
1647
1648         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1649                 log_warning("Too many stdout streams, refusing connection.");
1650                 close_nointr_nofail(fd);
1651                 return 0;
1652         }
1653
1654         stream = new0(StdoutStream, 1);
1655         if (!stream) {
1656                 log_error("Out of memory.");
1657                 close_nointr_nofail(fd);
1658                 return -ENOMEM;
1659         }
1660
1661         stream->fd = fd;
1662
1663         len = sizeof(stream->ucred);
1664         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1665                 log_error("Failed to determine peer credentials: %m");
1666                 r = -errno;
1667                 goto fail;
1668         }
1669
1670 #ifdef HAVE_SELINUX
1671         if (getpeercon(fd, &stream->security_context) < 0)
1672                 log_error("Failed to determine peer security context.");
1673 #endif
1674
1675         if (shutdown(fd, SHUT_WR) < 0) {
1676                 log_error("Failed to shutdown writing side of socket: %m");
1677                 r = -errno;
1678                 goto fail;
1679         }
1680
1681         zero(ev);
1682         ev.data.ptr = stream;
1683         ev.events = EPOLLIN;
1684         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1685                 log_error("Failed to add stream to event loop: %m");
1686                 r = -errno;
1687                 goto fail;
1688         }
1689
1690         stream->server = s;
1691         LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1692         s->n_stdout_streams ++;
1693
1694         return 0;
1695
1696 fail:
1697         stdout_stream_free(stream);
1698         return r;
1699 }
1700
1701 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1702         usec_t r;
1703         int k, i;
1704         char *p;
1705
1706         assert(_p);
1707         assert(*_p);
1708         assert(t);
1709
1710         p = *_p;
1711
1712         if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1713                 return 0;
1714
1715         r = 0;
1716
1717         for (i = 1; i <= 5; i++) {
1718                 r *= 10;
1719
1720                 if (p[i] == ' ')
1721                         continue;
1722
1723                 k = undecchar(p[i]);
1724                 if (k < 0)
1725                         return 0;
1726
1727                 r += k;
1728         }
1729
1730         for (i = 7; i <= 12; i++) {
1731                 r *= 10;
1732
1733                 k = undecchar(p[i]);
1734                 if (k < 0)
1735                         return 0;
1736
1737                 r += k;
1738         }
1739
1740         *t = r;
1741         *_p += 14;
1742         *_p += strspn(*_p, WHITESPACE);
1743
1744         return 1;
1745 }
1746
1747 static void proc_kmsg_line(Server *s, const char *p) {
1748         struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1749         char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1750         int priority = LOG_KERN | LOG_INFO;
1751         unsigned n = 0;
1752         usec_t usec;
1753         char *identifier = NULL, *pid = NULL;
1754
1755         assert(s);
1756         assert(p);
1757
1758         if (isempty(p))
1759                 return;
1760
1761         parse_syslog_priority((char **) &p, &priority);
1762
1763         if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1764                 return;
1765
1766         if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1767                 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1768                              (unsigned long long) usec) >= 0)
1769                         IOVEC_SET_STRING(iovec[n++], source_time);
1770         }
1771
1772         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1773
1774         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1775                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1776
1777         if ((priority & LOG_FACMASK) == LOG_KERN) {
1778
1779                 if (s->forward_to_syslog)
1780                         forward_syslog(s, priority, "kernel", p, NULL, NULL);
1781
1782                 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1783         } else {
1784                 read_identifier(&p, &identifier, &pid);
1785
1786                 if (s->forward_to_syslog)
1787                         forward_syslog(s, priority, identifier, p, NULL, NULL);
1788
1789                 if (identifier) {
1790                         syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1791                         if (syslog_identifier)
1792                                 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1793                 }
1794
1795                 if (pid) {
1796                         syslog_pid = strappend("SYSLOG_PID=", pid);
1797                         if (syslog_pid)
1798                                 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1799                 }
1800
1801                 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1802                         IOVEC_SET_STRING(iovec[n++], syslog_facility);
1803         }
1804
1805         message = strappend("MESSAGE=", p);
1806         if (message)
1807                 IOVEC_SET_STRING(iovec[n++], message);
1808
1809         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, priority);
1810
1811         free(message);
1812         free(syslog_priority);
1813         free(syslog_identifier);
1814         free(syslog_pid);
1815         free(syslog_facility);
1816         free(source_time);
1817         free(identifier);
1818         free(pid);
1819 }
1820
1821 static void proc_kmsg_scan(Server *s) {
1822         char *p;
1823         size_t remaining;
1824
1825         assert(s);
1826
1827         p = s->proc_kmsg_buffer;
1828         remaining = s->proc_kmsg_length;
1829         for (;;) {
1830                 char *end;
1831                 size_t skip;
1832
1833                 end = memchr(p, '\n', remaining);
1834                 if (end)
1835                         skip = end - p + 1;
1836                 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1837                         end = p + sizeof(s->proc_kmsg_buffer) - 1;
1838                         skip = remaining;
1839                 } else
1840                         break;
1841
1842                 *end = 0;
1843
1844                 proc_kmsg_line(s, p);
1845
1846                 remaining -= skip;
1847                 p += skip;
1848         }
1849
1850         if (p > s->proc_kmsg_buffer) {
1851                 memmove(s->proc_kmsg_buffer, p, remaining);
1852                 s->proc_kmsg_length = remaining;
1853         }
1854 }
1855
1856 static int system_journal_open(Server *s) {
1857         int r;
1858         char *fn;
1859         sd_id128_t machine;
1860         char ids[33];
1861
1862         r = sd_id128_get_machine(&machine);
1863         if (r < 0)
1864                 return r;
1865
1866         sd_id128_to_string(machine, ids);
1867
1868         if (!s->system_journal) {
1869
1870                 /* First try to create the machine path, but not the prefix */
1871                 fn = strappend("/var/log/journal/", ids);
1872                 if (!fn)
1873                         return -ENOMEM;
1874                 (void) mkdir(fn, 0755);
1875                 free(fn);
1876
1877                 /* The create the system journal file */
1878                 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1879                 if (!fn)
1880                         return -ENOMEM;
1881
1882                 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1883                 free(fn);
1884
1885                 if (r >= 0) {
1886                         journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1887
1888                         s->system_journal->metrics = s->system_metrics;
1889                         s->system_journal->compress = s->compress;
1890
1891                         server_fix_perms(s, s->system_journal, 0);
1892                 } else if (r < 0) {
1893
1894                         if (r != -ENOENT && r != -EROFS)
1895                                 log_warning("Failed to open system journal: %s", strerror(-r));
1896
1897                         r = 0;
1898                 }
1899         }
1900
1901         if (!s->runtime_journal) {
1902
1903                 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1904                 if (!fn)
1905                         return -ENOMEM;
1906
1907                 if (s->system_journal) {
1908
1909                         /* Try to open the runtime journal, but only
1910                          * if it already exists, so that we can flush
1911                          * it into the system journal */
1912
1913                         r = journal_file_open_reliably(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1914                         free(fn);
1915
1916                         if (r < 0) {
1917                                 if (r != -ENOENT)
1918                                         log_warning("Failed to open runtime journal: %s", strerror(-r));
1919
1920                                 r = 0;
1921                         }
1922
1923                 } else {
1924
1925                         /* OK, we really need the runtime journal, so create
1926                          * it if necessary. */
1927
1928                         (void) mkdir_parents(fn, 0755);
1929                         r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1930                         free(fn);
1931
1932                         if (r < 0) {
1933                                 log_error("Failed to open runtime journal: %s", strerror(-r));
1934                                 return r;
1935                         }
1936                 }
1937
1938                 if (s->runtime_journal) {
1939                         journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1940
1941                         s->runtime_journal->metrics = s->runtime_metrics;
1942                         s->runtime_journal->compress = s->compress;
1943
1944                         server_fix_perms(s, s->runtime_journal, 0);
1945                 }
1946         }
1947
1948         return r;
1949 }
1950
1951 static int server_flush_to_var(Server *s) {
1952         char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1953         Object *o = NULL;
1954         int r;
1955         sd_id128_t machine;
1956         sd_journal *j;
1957         usec_t ts;
1958
1959         assert(s);
1960
1961         if (!s->runtime_journal)
1962                 return 0;
1963
1964         ts = now(CLOCK_MONOTONIC);
1965         if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1966                 return 0;
1967
1968         s->var_available_timestamp = ts;
1969
1970         system_journal_open(s);
1971
1972         if (!s->system_journal)
1973                 return 0;
1974
1975         log_info("Flushing to /var...");
1976
1977         r = sd_id128_get_machine(&machine);
1978         if (r < 0) {
1979                 log_error("Failed to get machine id: %s", strerror(-r));
1980                 return r;
1981         }
1982
1983         r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1984         if (r < 0) {
1985                 log_error("Failed to read runtime journal: %s", strerror(-r));
1986                 return r;
1987         }
1988
1989         SD_JOURNAL_FOREACH(j) {
1990                 JournalFile *f;
1991
1992                 f = j->current_file;
1993                 assert(f && f->current_offset > 0);
1994
1995                 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1996                 if (r < 0) {
1997                         log_error("Can't read entry: %s", strerror(-r));
1998                         goto finish;
1999                 }
2000
2001                 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2002                 if (r == -E2BIG) {
2003                         log_info("Allocation limit reached.");
2004
2005                         journal_file_post_change(s->system_journal);
2006                         server_rotate(s);
2007                         server_vacuum(s);
2008
2009                         r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2010                 }
2011
2012                 if (r < 0) {
2013                         log_error("Can't write entry: %s", strerror(-r));
2014                         goto finish;
2015                 }
2016         }
2017
2018 finish:
2019         journal_file_post_change(s->system_journal);
2020
2021         journal_file_close(s->runtime_journal);
2022         s->runtime_journal = NULL;
2023
2024         if (r >= 0) {
2025                 sd_id128_to_string(machine, path + 17);
2026                 rm_rf(path, false, true, false);
2027         }
2028
2029         return r;
2030 }
2031
2032 static int server_read_proc_kmsg(Server *s) {
2033         ssize_t l;
2034         assert(s);
2035         assert(s->proc_kmsg_fd >= 0);
2036
2037         l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
2038         if (l < 0) {
2039
2040                 if (errno == EAGAIN || errno == EINTR)
2041                         return 0;
2042
2043                 log_error("Failed to read from kernel: %m");
2044                 return -errno;
2045         }
2046
2047         s->proc_kmsg_length += l;
2048
2049         proc_kmsg_scan(s);
2050         return 1;
2051 }
2052
2053 static int server_flush_proc_kmsg(Server *s) {
2054         int r;
2055
2056         assert(s);
2057
2058         if (s->proc_kmsg_fd < 0)
2059                 return 0;
2060
2061         log_info("Flushing /proc/kmsg...");
2062
2063         for (;;) {
2064                 r = server_read_proc_kmsg(s);
2065                 if (r < 0)
2066                         return r;
2067
2068                 if (r == 0)
2069                         break;
2070         }
2071
2072         return 0;
2073 }
2074
2075 static int process_event(Server *s, struct epoll_event *ev) {
2076         assert(s);
2077
2078         if (ev->data.fd == s->signal_fd) {
2079                 struct signalfd_siginfo sfsi;
2080                 ssize_t n;
2081
2082                 if (ev->events != EPOLLIN) {
2083                         log_info("Got invalid event from epoll.");
2084                         return -EIO;
2085                 }
2086
2087                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
2088                 if (n != sizeof(sfsi)) {
2089
2090                         if (n >= 0)
2091                                 return -EIO;
2092
2093                         if (errno == EINTR || errno == EAGAIN)
2094                                 return 1;
2095
2096                         return -errno;
2097                 }
2098
2099                 if (sfsi.ssi_signo == SIGUSR1) {
2100                         server_flush_to_var(s);
2101                         return 0;
2102                 }
2103
2104                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
2105                 return 0;
2106
2107         } else if (ev->data.fd == s->proc_kmsg_fd) {
2108                 int r;
2109
2110                 if (ev->events != EPOLLIN) {
2111                         log_info("Got invalid event from epoll.");
2112                         return -EIO;
2113                 }
2114
2115                 r = server_read_proc_kmsg(s);
2116                 if (r < 0)
2117                         return r;
2118
2119                 return 1;
2120
2121         } else if (ev->data.fd == s->native_fd ||
2122                    ev->data.fd == s->syslog_fd) {
2123
2124                 if (ev->events != EPOLLIN) {
2125                         log_info("Got invalid event from epoll.");
2126                         return -EIO;
2127                 }
2128
2129                 for (;;) {
2130                         struct msghdr msghdr;
2131                         struct iovec iovec;
2132                         struct ucred *ucred = NULL;
2133                         struct timeval *tv = NULL;
2134                         struct cmsghdr *cmsg;
2135                         char *label = NULL;
2136                         size_t label_len = 0;
2137                         union {
2138                                 struct cmsghdr cmsghdr;
2139                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2140                                             CMSG_SPACE(sizeof(struct timeval)) +
2141                                             CMSG_SPACE(sizeof(int)) +
2142                                             CMSG_SPACE(PAGE_SIZE)]; /* selinux label */
2143                         } control;
2144                         ssize_t n;
2145                         int v;
2146                         int *fds = NULL;
2147                         unsigned n_fds = 0;
2148
2149                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
2150                                 log_error("SIOCINQ failed: %m");
2151                                 return -errno;
2152                         }
2153
2154                         if (s->buffer_size < (size_t) v) {
2155                                 void *b;
2156                                 size_t l;
2157
2158                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2159                                 b = realloc(s->buffer, l+1);
2160
2161                                 if (!b) {
2162                                         log_error("Couldn't increase buffer.");
2163                                         return -ENOMEM;
2164                                 }
2165
2166                                 s->buffer_size = l;
2167                                 s->buffer = b;
2168                         }
2169
2170                         zero(iovec);
2171                         iovec.iov_base = s->buffer;
2172                         iovec.iov_len = s->buffer_size;
2173
2174                         zero(control);
2175                         zero(msghdr);
2176                         msghdr.msg_iov = &iovec;
2177                         msghdr.msg_iovlen = 1;
2178                         msghdr.msg_control = &control;
2179                         msghdr.msg_controllen = sizeof(control);
2180
2181                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2182                         if (n < 0) {
2183
2184                                 if (errno == EINTR || errno == EAGAIN)
2185                                         return 1;
2186
2187                                 log_error("recvmsg() failed: %m");
2188                                 return -errno;
2189                         }
2190
2191                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2192
2193                                 if (cmsg->cmsg_level == SOL_SOCKET &&
2194                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
2195                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2196                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
2197                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
2198                                          cmsg->cmsg_type == SCM_SECURITY) {
2199                                         label = (char*) CMSG_DATA(cmsg);
2200                                         label_len = cmsg->cmsg_len - CMSG_LEN(0);
2201                                 } else if (cmsg->cmsg_level == SOL_SOCKET &&
2202                                          cmsg->cmsg_type == SO_TIMESTAMP &&
2203                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2204                                         tv = (struct timeval*) CMSG_DATA(cmsg);
2205                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
2206                                          cmsg->cmsg_type == SCM_RIGHTS) {
2207                                         fds = (int*) CMSG_DATA(cmsg);
2208                                         n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2209                                 }
2210                         }
2211
2212                         if (ev->data.fd == s->syslog_fd) {
2213                                 char *e;
2214
2215                                 if (n > 0 && n_fds == 0) {
2216                                         e = memchr(s->buffer, '\n', n);
2217                                         if (e)
2218                                                 *e = 0;
2219                                         else
2220                                                 s->buffer[n] = 0;
2221
2222                                         process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
2223                                 } else if (n_fds > 0)
2224                                         log_warning("Got file descriptors via syslog socket. Ignoring.");
2225
2226                         } else {
2227                                 if (n > 0 && n_fds == 0)
2228                                         process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
2229                                 else if (n == 0 && n_fds == 1)
2230                                         process_native_file(s, fds[0], ucred, tv, label, label_len);
2231                                 else if (n_fds > 0)
2232                                         log_warning("Got too many file descriptors via native socket. Ignoring.");
2233                         }
2234
2235                         close_many(fds, n_fds);
2236                 }
2237
2238                 return 1;
2239
2240         } else if (ev->data.fd == s->stdout_fd) {
2241
2242                 if (ev->events != EPOLLIN) {
2243                         log_info("Got invalid event from epoll.");
2244                         return -EIO;
2245                 }
2246
2247                 stdout_stream_new(s);
2248                 return 1;
2249
2250         } else {
2251                 StdoutStream *stream;
2252
2253                 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2254                         log_info("Got invalid event from epoll.");
2255                         return -EIO;
2256                 }
2257
2258                 /* If it is none of the well-known fds, it must be an
2259                  * stdout stream fd. Note that this is a bit ugly here
2260                  * (since we rely that none of the well-known fds
2261                  * could be interpreted as pointer), but nonetheless
2262                  * safe, since the well-known fds would never get an
2263                  * fd > 4096, i.e. beyond the first memory page */
2264
2265                 stream = ev->data.ptr;
2266
2267                 if (stdout_stream_process(stream) <= 0)
2268                         stdout_stream_free(stream);
2269
2270                 return 1;
2271         }
2272
2273         log_error("Unknown event.");
2274         return 0;
2275 }
2276
2277 static int open_syslog_socket(Server *s) {
2278         union sockaddr_union sa;
2279         int one, r;
2280         struct epoll_event ev;
2281
2282         assert(s);
2283
2284         if (s->syslog_fd < 0) {
2285
2286                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2287                 if (s->syslog_fd < 0) {
2288                         log_error("socket() failed: %m");
2289                         return -errno;
2290                 }
2291
2292                 zero(sa);
2293                 sa.un.sun_family = AF_UNIX;
2294                 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2295
2296                 unlink(sa.un.sun_path);
2297
2298                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2299                 if (r < 0) {
2300                         log_error("bind() failed: %m");
2301                         return -errno;
2302                 }
2303
2304                 chmod(sa.un.sun_path, 0666);
2305         } else
2306                 fd_nonblock(s->syslog_fd, 1);
2307
2308         one = 1;
2309         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2310         if (r < 0) {
2311                 log_error("SO_PASSCRED failed: %m");
2312                 return -errno;
2313         }
2314
2315 #ifdef HAVE_SELINUX
2316         one = 1;
2317         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2318         if (r < 0)
2319                 log_warning("SO_PASSSEC failed: %m");
2320 #endif
2321
2322         one = 1;
2323         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2324         if (r < 0) {
2325                 log_error("SO_TIMESTAMP failed: %m");
2326                 return -errno;
2327         }
2328
2329         zero(ev);
2330         ev.events = EPOLLIN;
2331         ev.data.fd = s->syslog_fd;
2332         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2333                 log_error("Failed to add syslog server fd to epoll object: %m");
2334                 return -errno;
2335         }
2336
2337         return 0;
2338 }
2339
2340 static int open_native_socket(Server*s) {
2341         union sockaddr_union sa;
2342         int one, r;
2343         struct epoll_event ev;
2344
2345         assert(s);
2346
2347         if (s->native_fd < 0) {
2348
2349                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2350                 if (s->native_fd < 0) {
2351                         log_error("socket() failed: %m");
2352                         return -errno;
2353                 }
2354
2355                 zero(sa);
2356                 sa.un.sun_family = AF_UNIX;
2357                 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2358
2359                 unlink(sa.un.sun_path);
2360
2361                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2362                 if (r < 0) {
2363                         log_error("bind() failed: %m");
2364                         return -errno;
2365                 }
2366
2367                 chmod(sa.un.sun_path, 0666);
2368         } else
2369                 fd_nonblock(s->native_fd, 1);
2370
2371         one = 1;
2372         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2373         if (r < 0) {
2374                 log_error("SO_PASSCRED failed: %m");
2375                 return -errno;
2376         }
2377
2378 #ifdef HAVE_SELINUX
2379         one = 1;
2380         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2381         if (r < 0)
2382                 log_warning("SO_PASSSEC failed: %m");
2383 #endif
2384
2385         one = 1;
2386         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2387         if (r < 0) {
2388                 log_error("SO_TIMESTAMP failed: %m");
2389                 return -errno;
2390         }
2391
2392         zero(ev);
2393         ev.events = EPOLLIN;
2394         ev.data.fd = s->native_fd;
2395         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2396                 log_error("Failed to add native server fd to epoll object: %m");
2397                 return -errno;
2398         }
2399
2400         return 0;
2401 }
2402
2403 static int open_stdout_socket(Server *s) {
2404         union sockaddr_union sa;
2405         int r;
2406         struct epoll_event ev;
2407
2408         assert(s);
2409
2410         if (s->stdout_fd < 0) {
2411
2412                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2413                 if (s->stdout_fd < 0) {
2414                         log_error("socket() failed: %m");
2415                         return -errno;
2416                 }
2417
2418                 zero(sa);
2419                 sa.un.sun_family = AF_UNIX;
2420                 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2421
2422                 unlink(sa.un.sun_path);
2423
2424                 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2425                 if (r < 0) {
2426                         log_error("bind() failed: %m");
2427                         return -errno;
2428                 }
2429
2430                 chmod(sa.un.sun_path, 0666);
2431
2432                 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2433                         log_error("liste() failed: %m");
2434                         return -errno;
2435                 }
2436         } else
2437                 fd_nonblock(s->stdout_fd, 1);
2438
2439         zero(ev);
2440         ev.events = EPOLLIN;
2441         ev.data.fd = s->stdout_fd;
2442         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2443                 log_error("Failed to add stdout server fd to epoll object: %m");
2444                 return -errno;
2445         }
2446
2447         return 0;
2448 }
2449
2450 static int open_proc_kmsg(Server *s) {
2451         struct epoll_event ev;
2452
2453         assert(s);
2454
2455         if (!s->import_proc_kmsg)
2456                 return 0;
2457
2458
2459         s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2460         if (s->proc_kmsg_fd < 0) {
2461                 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2462                 return 0;
2463         }
2464
2465         zero(ev);
2466         ev.events = EPOLLIN;
2467         ev.data.fd = s->proc_kmsg_fd;
2468         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2469                 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2470                 return -errno;
2471         }
2472
2473         return 0;
2474 }
2475
2476 static int open_signalfd(Server *s) {
2477         sigset_t mask;
2478         struct epoll_event ev;
2479
2480         assert(s);
2481
2482         assert_se(sigemptyset(&mask) == 0);
2483         sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2484         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2485
2486         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2487         if (s->signal_fd < 0) {
2488                 log_error("signalfd(): %m");
2489                 return -errno;
2490         }
2491
2492         zero(ev);
2493         ev.events = EPOLLIN;
2494         ev.data.fd = s->signal_fd;
2495
2496         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2497                 log_error("epoll_ctl(): %m");
2498                 return -errno;
2499         }
2500
2501         return 0;
2502 }
2503
2504 static int server_parse_proc_cmdline(Server *s) {
2505         char *line, *w, *state;
2506         int r;
2507         size_t l;
2508
2509         if (detect_container(NULL) > 0)
2510                 return 0;
2511
2512         r = read_one_line_file("/proc/cmdline", &line);
2513         if (r < 0) {
2514                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2515                 return 0;
2516         }
2517
2518         FOREACH_WORD_QUOTED(w, l, line, state) {
2519                 char *word;
2520
2521                 word = strndup(w, l);
2522                 if (!word) {
2523                         r = -ENOMEM;
2524                         goto finish;
2525                 }
2526
2527                 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2528                         r = parse_boolean(word + 35);
2529                         if (r < 0)
2530                                 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2531                         else
2532                                 s->forward_to_syslog = r;
2533                 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2534                         r = parse_boolean(word + 33);
2535                         if (r < 0)
2536                                 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2537                         else
2538                                 s->forward_to_kmsg = r;
2539                 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2540                         r = parse_boolean(word + 36);
2541                         if (r < 0)
2542                                 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2543                         else
2544                                 s->forward_to_console = r;
2545                 }
2546
2547                 free(word);
2548         }
2549
2550         r = 0;
2551
2552 finish:
2553         free(line);
2554         return r;
2555 }
2556
2557 static int server_parse_config_file(Server *s) {
2558         FILE *f;
2559         const char *fn;
2560         int r;
2561
2562         assert(s);
2563
2564         fn = "/etc/systemd/systemd-journald.conf";
2565         f = fopen(fn, "re");
2566         if (!f) {
2567                 if (errno == ENOENT)
2568                         return 0;
2569
2570                 log_warning("Failed to open configuration file %s: %m", fn);
2571                 return -errno;
2572         }
2573
2574         r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2575         if (r < 0)
2576                 log_warning("Failed to parse configuration file: %s", strerror(-r));
2577
2578         fclose(f);
2579
2580         return r;
2581 }
2582
2583 static int server_init(Server *s) {
2584         int n, r, fd;
2585
2586         assert(s);
2587
2588         zero(*s);
2589         s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2590         s->compress = true;
2591
2592         s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2593         s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2594
2595         s->forward_to_syslog = true;
2596         s->import_proc_kmsg = true;
2597
2598         memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2599         memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2600
2601         server_parse_config_file(s);
2602         server_parse_proc_cmdline(s);
2603
2604         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2605         if (!s->user_journals) {
2606                 log_error("Out of memory.");
2607                 return -ENOMEM;
2608         }
2609
2610         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2611         if (s->epoll_fd < 0) {
2612                 log_error("Failed to create epoll object: %m");
2613                 return -errno;
2614         }
2615
2616         n = sd_listen_fds(true);
2617         if (n < 0) {
2618                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2619                 return n;
2620         }
2621
2622         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2623
2624                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2625
2626                         if (s->native_fd >= 0) {
2627                                 log_error("Too many native sockets passed.");
2628                                 return -EINVAL;
2629                         }
2630
2631                         s->native_fd = fd;
2632
2633                 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2634
2635                         if (s->stdout_fd >= 0) {
2636                                 log_error("Too many stdout sockets passed.");
2637                                 return -EINVAL;
2638                         }
2639
2640                         s->stdout_fd = fd;
2641
2642                 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2643
2644                         if (s->syslog_fd >= 0) {
2645                                 log_error("Too many /dev/log sockets passed.");
2646                                 return -EINVAL;
2647                         }
2648
2649                         s->syslog_fd = fd;
2650
2651                 } else {
2652                         log_error("Unknown socket passed.");
2653                         return -EINVAL;
2654                 }
2655         }
2656
2657         r = open_syslog_socket(s);
2658         if (r < 0)
2659                 return r;
2660
2661         r = open_native_socket(s);
2662         if (r < 0)
2663                 return r;
2664
2665         r = open_stdout_socket(s);
2666         if (r < 0)
2667                 return r;
2668
2669         r = open_proc_kmsg(s);
2670         if (r < 0)
2671                 return r;
2672
2673         r = open_signalfd(s);
2674         if (r < 0)
2675                 return r;
2676
2677         s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2678         if (!s->rate_limit)
2679                 return -ENOMEM;
2680
2681         r = system_journal_open(s);
2682         if (r < 0)
2683                 return r;
2684
2685         return 0;
2686 }
2687
2688 static void server_done(Server *s) {
2689         JournalFile *f;
2690         assert(s);
2691
2692         while (s->stdout_streams)
2693                 stdout_stream_free(s->stdout_streams);
2694
2695         if (s->system_journal)
2696                 journal_file_close(s->system_journal);
2697
2698         if (s->runtime_journal)
2699                 journal_file_close(s->runtime_journal);
2700
2701         while ((f = hashmap_steal_first(s->user_journals)))
2702                 journal_file_close(f);
2703
2704         hashmap_free(s->user_journals);
2705
2706         if (s->epoll_fd >= 0)
2707                 close_nointr_nofail(s->epoll_fd);
2708
2709         if (s->signal_fd >= 0)
2710                 close_nointr_nofail(s->signal_fd);
2711
2712         if (s->syslog_fd >= 0)
2713                 close_nointr_nofail(s->syslog_fd);
2714
2715         if (s->native_fd >= 0)
2716                 close_nointr_nofail(s->native_fd);
2717
2718         if (s->stdout_fd >= 0)
2719                 close_nointr_nofail(s->stdout_fd);
2720
2721         if (s->proc_kmsg_fd >= 0)
2722                 close_nointr_nofail(s->proc_kmsg_fd);
2723
2724         if (s->rate_limit)
2725                 journal_rate_limit_free(s->rate_limit);
2726
2727         free(s->buffer);
2728 }
2729
2730 int main(int argc, char *argv[]) {
2731         Server server;
2732         int r;
2733
2734         /* if (getppid() != 1) { */
2735         /*         log_error("This program should be invoked by init only."); */
2736         /*         return EXIT_FAILURE; */
2737         /* } */
2738
2739         if (argc > 1) {
2740                 log_error("This program does not take arguments.");
2741                 return EXIT_FAILURE;
2742         }
2743
2744         log_set_target(LOG_TARGET_CONSOLE);
2745         log_parse_environment();
2746         log_open();
2747
2748         umask(0022);
2749
2750         r = server_init(&server);
2751         if (r < 0)
2752                 goto finish;
2753
2754         server_vacuum(&server);
2755         server_flush_to_var(&server);
2756         server_flush_proc_kmsg(&server);
2757
2758         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2759         driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2760
2761         sd_notify(false,
2762                   "READY=1\n"
2763                   "STATUS=Processing requests...");
2764
2765         for (;;) {
2766                 struct epoll_event event;
2767
2768                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2769                 if (r < 0) {
2770
2771                         if (errno == EINTR)
2772                                 continue;
2773
2774                         log_error("epoll_wait() failed: %m");
2775                         r = -errno;
2776                         goto finish;
2777                 } else if (r == 0)
2778                         break;
2779
2780                 r = process_event(&server, &event);
2781                 if (r < 0)
2782                         goto finish;
2783                 else if (r == 0)
2784                         break;
2785         }
2786
2787         log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2788         driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2789
2790 finish:
2791         sd_notify(false,
2792                   "STATUS=Shutting down...");
2793
2794         server_done(&server);
2795
2796         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
2797 }