src/journal/journald.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/epoll.h>
  23 #include <sys/socket.h>
  24 #include <errno.h>
  25 #include <sys/signalfd.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <sys/acl.h>
  29 #include <acl/libacl.h>
  30 #include <stddef.h>
  31 #include <sys/ioctl.h>
  32 #include <linux/sockios.h>
  33
  34 #include "hashmap.h"
  35 #include "journal-file.h"
  36 #include "sd-daemon.h"
  37 #include "socket-util.h"
  38 #include "acl-util.h"
  39 #include "cgroup-util.h"
  40
  41 typedef struct Server {
  42         int epoll_fd;
  43         int signal_fd;
  44         int syslog_fd;
  45         int native_fd;
  46
  47         JournalFile *runtime_journal;
  48         JournalFile *system_journal;
  49         Hashmap *user_journals;
  50
  51         uint64_t seqnum;
  52
  53         char *buffer;
  54         size_t buffer_size;
  55 } Server;
  56
  57 static void fix_perms(JournalFile *f, uid_t uid) {
  58         acl_t acl;
  59         acl_entry_t entry;
  60         acl_permset_t permset;
  61         int r;
  62
  63         assert(f);
  64
  65         r = fchmod_and_fchown(f->fd, 0640, 0, 0);
  66         if (r < 0)
  67                 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
  68
  69         if (uid <= 0)
  70                 return;
  71
  72         acl = acl_get_fd(f->fd);
  73         if (!acl) {
  74                 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
  75                 return;
  76         }
  77
  78         r = acl_find_uid(acl, uid, &entry);
  79         if (r <= 0) {
  80
  81                 if (acl_create_entry(&acl, &entry) < 0 ||
  82                     acl_set_tag_type(entry, ACL_USER) < 0 ||
  83                     acl_set_qualifier(entry, &uid) < 0) {
  84                         log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
  85                         goto finish;
  86                 }
  87         }
  88
  89         if (acl_get_permset(entry, &permset) < 0 ||
  90             acl_add_perm(permset, ACL_READ) < 0 ||
  91             acl_calc_mask(&acl) < 0) {
  92                 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
  93                 goto finish;
  94         }
  95
  96         if (acl_set_fd(f->fd, acl) < 0)
  97                 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
  98
  99 finish:
 100         acl_free(acl);
 101 }
 102
 103 static JournalFile* find_journal(Server *s, uid_t uid) {
 104         char *p;
 105         int r;
 106         JournalFile *f;
 107         char ids[33];
 108         sd_id128_t machine;
 109
 110         assert(s);
 111
 112         /* We split up user logs only on /var, not on /run */
 113         if (!s->system_journal)
 114                 return s->runtime_journal;
 115
 116         if (uid <= 0)
 117                 return s->system_journal;
 118
 119         r = sd_id128_get_machine(&machine);
 120         if (r < 0)
 121                 return s->system_journal;
 122
 123         f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
 124         if (f)
 125                 return f;
 126
 127         if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
 128                 return s->system_journal;
 129
 130         r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
 131         free(p);
 132
 133         if (r < 0)
 134                 return s->system_journal;
 135
 136         fix_perms(f, uid);
 137
 138         r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
 139         if (r < 0) {
 140                 journal_file_close(f);
 141                 return s->system_journal;
 142         }
 143
 144         return f;
 145 }
 146
 147 static void dispatch_message(Server *s, struct iovec *iovec, unsigned n, unsigned m, struct ucred *ucred, struct timeval *tv) {
 148         char *pid = NULL, *uid = NULL, *gid = NULL,
 149                 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
 150                 *comm = NULL, *cmdline = NULL, *hostname = NULL,
 151                 *audit_session = NULL, *audit_loginuid = NULL,
 152                 *exe = NULL, *cgroup = NULL;
 153
 154         char idbuf[33];
 155         sd_id128_t id;
 156         int r;
 157         char *t;
 158         uid_t loginuid = 0, realuid = 0;
 159         JournalFile *f;
 160
 161         assert(s);
 162         assert(iovec || n == 0);
 163
 164         if (n == 0)
 165                 return;
 166
 167         assert(n + 13 <= m);
 168
 169         if (ucred) {
 170                 uint32_t session;
 171                 char *path;
 172
 173                 realuid = ucred->uid;
 174
 175                 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
 176                         IOVEC_SET_STRING(iovec[n++], pid);
 177
 178                 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
 179                         IOVEC_SET_STRING(iovec[n++], uid);
 180
 181                 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
 182                         IOVEC_SET_STRING(iovec[n++], gid);
 183
 184                 r = get_process_comm(ucred->pid, &t);
 185                 if (r >= 0) {
 186                         comm = strappend("_COMM=", t);
 187                         if (comm)
 188                                 IOVEC_SET_STRING(iovec[n++], comm);
 189                         free(t);
 190                 }
 191
 192                 r = get_process_exe(ucred->pid, &t);
 193                 if (r >= 0) {
 194                         exe = strappend("_EXE=", t);
 195                         if (comm)
 196                                 IOVEC_SET_STRING(iovec[n++], exe);
 197                         free(t);
 198                 }
 199
 200                 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
 201                 if (r >= 0) {
 202                         cmdline = strappend("_CMDLINE=", t);
 203                         if (cmdline)
 204                                 IOVEC_SET_STRING(iovec[n++], cmdline);
 205                         free(t);
 206                 }
 207
 208                 r = audit_session_from_pid(ucred->pid, &session);
 209                 if (r >= 0)
 210                         if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0)
 211                                 IOVEC_SET_STRING(iovec[n++], audit_session);
 212
 213                 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
 214                 if (r >= 0)
 215                         if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
 216                                 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
 217
 218                 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, ucred->pid, &path);
 219                 if (r >= 0) {
 220                         cgroup = strappend("_SYSTEMD_CGROUP=", path);
 221                         if (cgroup)
 222                                 IOVEC_SET_STRING(iovec[n++], cgroup);
 223                         free(path);
 224                 }
 225         }
 226
 227         if (tv) {
 228                 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
 229                              (unsigned long long) timeval_load(tv)) >= 0)
 230                         IOVEC_SET_STRING(iovec[n++], source_time);
 231         }
 232
 233         /* Note that strictly speaking storing the boot id here is
 234          * redundant since the entry includes this in-line
 235          * anyway. However, we need this indexed, too. */
 236         r = sd_id128_get_boot(&id);
 237         if (r >= 0)
 238                 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 239                         IOVEC_SET_STRING(iovec[n++], boot_id);
 240
 241         r = sd_id128_get_machine(&id);
 242         if (r >= 0)
 243                 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
 244                         IOVEC_SET_STRING(iovec[n++], machine_id);
 245
 246         t = gethostname_malloc();
 247         if (t) {
 248                 hostname = strappend("_HOSTNAME=", t);
 249                 if (hostname)
 250                         IOVEC_SET_STRING(iovec[n++], hostname);
 251                 free(t);
 252         }
 253
 254         assert(n <= m);
 255
 256         f = find_journal(s, realuid == 0 ? 0 : loginuid);
 257         if (!f)
 258                 log_warning("Dropping message, as we can't find a place to store the data.");
 259         else {
 260                 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
 261
 262                 if (r < 0)
 263                         log_error("Failed to write entry, ignoring: %s", strerror(-r));
 264         }
 265
 266         free(pid);
 267         free(uid);
 268         free(gid);
 269         free(comm);
 270         free(exe);
 271         free(cmdline);
 272         free(source_time);
 273         free(boot_id);
 274         free(machine_id);
 275         free(hostname);
 276         free(audit_session);
 277         free(audit_loginuid);
 278         free(cgroup);
 279
 280 }
 281
 282 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
 283         char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL;
 284         struct iovec iovec[16];
 285         unsigned n = 0;
 286         int priority = LOG_USER | LOG_INFO;
 287
 288         assert(s);
 289         assert(buf);
 290
 291         parse_syslog_priority((char**) &buf, &priority);
 292         skip_syslog_date((char**) &buf);
 293
 294         if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
 295                 IOVEC_SET_STRING(iovec[n++], syslog_priority);
 296
 297         if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
 298                 IOVEC_SET_STRING(iovec[n++], syslog_facility);
 299
 300         message = strappend("MESSAGE=", buf);
 301         if (message)
 302                 IOVEC_SET_STRING(iovec[n++], message);
 303
 304         dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv);
 305
 306         free(message);
 307         free(syslog_facility);
 308         free(syslog_priority);
 309 }
 310
 311 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
 312         struct iovec *iovec = NULL;
 313         unsigned n = 0, m = 0, j;
 314         const char *p;
 315         size_t remaining;
 316
 317         assert(s);
 318         assert(buffer || n == 0);
 319
 320         p = buffer;
 321         remaining = buffer_size;
 322
 323         while (remaining > 0) {
 324                 const char *e, *q;
 325
 326                 e = memchr(p, '\n', remaining);
 327
 328                 if (!e) {
 329                         /* Trailing noise, let's ignore it, and flush what we collected */
 330                         log_debug("Received message with trailing noise, ignoring.");
 331                         break;
 332                 }
 333
 334                 if (e == p) {
 335                         /* Entry separator */
 336                         dispatch_message(s, iovec, n, m, ucred, tv);
 337                         n = 0;
 338
 339                         p++;
 340                         remaining--;
 341                         continue;
 342                 }
 343
 344                 if (*p == '.') {
 345                         /* Control command, ignore for now */
 346                         remaining -= (e - p) + 1;
 347                         p = e + 1;
 348                         continue;
 349                 }
 350
 351                 /* A property follows */
 352
 353                 if (n+13 >= m) {
 354                         struct iovec *c;
 355                         unsigned u;
 356
 357                         u = MAX((n+13U) * 2U, 4U);
 358                         c = realloc(iovec, u * sizeof(struct iovec));
 359                         if (!c) {
 360                                 log_error("Out of memory");
 361                                 break;
 362                         }
 363
 364                         iovec = c;
 365                         m = u;
 366                 }
 367
 368                 q = memchr(p, '=', e - p);
 369                 if (q) {
 370                         iovec[n].iov_base = (char*) p;
 371                         iovec[n].iov_len = e - p;
 372                         n++;
 373
 374                         remaining -= (e - p) + 1;
 375                         p = e + 1;
 376                         continue;
 377                 } else {
 378                         uint64_t l;
 379                         char *k;
 380
 381                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
 382                                 log_debug("Failed to parse message, ignoring.");
 383                                 break;
 384                         }
 385
 386                         memcpy(&l, e + 1, sizeof(uint64_t));
 387                         l = le64toh(l);
 388
 389                         if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
 390                             e[1+sizeof(uint64_t)+l] != '\n') {
 391                                 log_debug("Failed to parse message, ignoring.");
 392                                 break;
 393                         }
 394
 395                         k = malloc((e - p) + 1 + l);
 396                         if (!k) {
 397                                 log_error("Out of memory");
 398                                 break;
 399                         }
 400
 401                         memcpy(k, p, e - p);
 402                         k[e - p] = '=';
 403                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
 404
 405                         iovec[n].iov_base = k;
 406                         iovec[n].iov_len = (e - p) + 1 + l;
 407                         n++;
 408
 409                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
 410                         p = e + 1 + sizeof(uint64_t) + l + 1;
 411                 }
 412         }
 413
 414         dispatch_message(s, iovec, n, m, ucred, tv);
 415
 416         for (j = 0; j < n; j++)
 417                 if (iovec[j].iov_base < buffer ||
 418                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
 419                         free(iovec[j].iov_base);
 420 }
 421
 422 static int process_event(Server *s, struct epoll_event *ev) {
 423         assert(s);
 424
 425         if (ev->events != EPOLLIN) {
 426                 log_info("Got invalid event from epoll.");
 427                 return -EIO;
 428         }
 429
 430         if (ev->data.fd == s->signal_fd) {
 431                 struct signalfd_siginfo sfsi;
 432                 ssize_t n;
 433
 434                 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
 435                 if (n != sizeof(sfsi)) {
 436
 437                         if (n >= 0)
 438                                 return -EIO;
 439
 440                         if (errno == EINTR || errno == EAGAIN)
 441                                 return 0;
 442
 443                         return -errno;
 444                 }
 445
 446                 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
 447                 return 0;
 448
 449         }
 450
 451         if (ev->data.fd == s->native_fd ||
 452             ev->data.fd == s->syslog_fd) {
 453                 for (;;) {
 454                         struct msghdr msghdr;
 455                         struct iovec iovec;
 456                         struct ucred *ucred = NULL;
 457                         struct timeval *tv = NULL;
 458                         struct cmsghdr *cmsg;
 459                         union {
 460                                 struct cmsghdr cmsghdr;
 461                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
 462                                             CMSG_SPACE(sizeof(struct timeval))];
 463                         } control;
 464                         ssize_t n;
 465                         int v;
 466
 467                         if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
 468                                 log_error("SIOCINQ failed: %m");
 469                                 return -errno;
 470                         }
 471
 472                         if (v <= 0)
 473                                 return 1;
 474
 475                         if (s->buffer_size < (size_t) v) {
 476                                 void *b;
 477                                 size_t l;
 478
 479                                 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
 480                                 b = realloc(s->buffer, l+1);
 481
 482                                 if (!b) {
 483                                         log_error("Couldn't increase buffer.");
 484                                         return -ENOMEM;
 485                                 }
 486
 487                                 s->buffer_size = l;
 488                                 s->buffer = b;
 489                         }
 490
 491                         zero(iovec);
 492                         iovec.iov_base = s->buffer;
 493                         iovec.iov_len = s->buffer_size;
 494
 495                         zero(control);
 496                         zero(msghdr);
 497                         msghdr.msg_iov = &iovec;
 498                         msghdr.msg_iovlen = 1;
 499                         msghdr.msg_control = &control;
 500                         msghdr.msg_controllen = sizeof(control);
 501
 502                         n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
 503                         if (n < 0) {
 504
 505                                 if (errno == EINTR || errno == EAGAIN)
 506                                         return 1;
 507
 508                                 log_error("recvmsg() failed: %m");
 509                                 return -errno;
 510                         }
 511
 512                         for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
 513
 514                                 if (cmsg->cmsg_level == SOL_SOCKET &&
 515                                     cmsg->cmsg_type == SCM_CREDENTIALS &&
 516                                     cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
 517                                         ucred = (struct ucred*) CMSG_DATA(cmsg);
 518                                 else if (cmsg->cmsg_level == SOL_SOCKET &&
 519                                          cmsg->cmsg_type == SO_TIMESTAMP &&
 520                                          cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
 521                                         tv = (struct timeval*) CMSG_DATA(cmsg);
 522                         }
 523
 524                         if (ev->data.fd == s->syslog_fd) {
 525                                 char *e;
 526
 527                                 e = memchr(s->buffer, '\n', n);
 528                                 if (e)
 529                                         *e = 0;
 530                                 else
 531                                         s->buffer[n] = 0;
 532
 533                                 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
 534                         } else
 535                                 process_native_message(s, s->buffer, n, ucred, tv);
 536                 }
 537
 538                 return 1;
 539         }
 540
 541         log_error("Unknown event.");
 542         return 0;
 543 }
 544
 545 static int system_journal_open(Server *s) {
 546         int r;
 547         char *fn;
 548         sd_id128_t machine;
 549         char ids[33];
 550
 551         r = sd_id128_get_machine(&machine);
 552         if (r < 0)
 553                 return r;
 554
 555         /* First try to create the machine path, but not the prefix */
 556         fn = strappend("/var/log/journal/", sd_id128_to_string(machine, ids));
 557         if (!fn)
 558                 return -ENOMEM;
 559         (void) mkdir(fn, 0755);
 560         free(fn);
 561
 562         /* The create the system journal file */
 563         fn = join("/var/log/journal/", ids, "/system.journal", NULL);
 564         if (!fn)
 565                 return -ENOMEM;
 566
 567         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
 568         free(fn);
 569
 570         if (r >= 0) {
 571                 fix_perms(s->system_journal, 0);
 572                 return r;
 573         }
 574
 575         if (r < 0 && r != -ENOENT) {
 576                 log_error("Failed to open system journal: %s", strerror(-r));
 577                 return r;
 578         }
 579
 580         /* /var didn't work, so try /run, but this time we
 581          * create the prefix too */
 582         fn = join("/run/log/journal/", ids, "/system.journal", NULL);
 583         if (!fn)
 584                 return -ENOMEM;
 585
 586         (void) mkdir_parents(fn, 0755);
 587         r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
 588         free(fn);
 589
 590         if (r < 0) {
 591                 log_error("Failed to open runtime journal: %s", strerror(-r));
 592                 return r;
 593         }
 594
 595         fix_perms(s->runtime_journal, 0);
 596         return r;
 597 }
 598
 599 static int open_syslog_socket(Server *s) {
 600         union sockaddr_union sa;
 601         int one, r;
 602
 603         assert(s);
 604
 605         if (s->syslog_fd < 0) {
 606
 607                 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
 608                 if (s->syslog_fd < 0) {
 609                         log_error("socket() failed: %m");
 610                         return -errno;
 611                 }
 612
 613                 zero(sa);
 614                 sa.un.sun_family = AF_UNIX;
 615                 strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));
 616
 617                 unlink(sa.un.sun_path);
 618
 619                 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
 620                 if (r < 0) {
 621                         log_error("bind() failed: %m");
 622                         return -errno;
 623                 }
 624
 625                 chmod(sa.un.sun_path, 0666);
 626         }
 627
 628         one = 1;
 629         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
 630         if (r < 0) {
 631                 log_error("SO_PASSCRED failed: %m");
 632                 return -errno;
 633         }
 634
 635         one = 1;
 636         r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
 637         if (r < 0) {
 638                 log_error("SO_TIMESTAMP failed: %m");
 639                 return -errno;
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int open_native_socket(Server*s) {
 646         union sockaddr_union sa;
 647         int one, r;
 648
 649         assert(s);
 650
 651         if (s->native_fd < 0) {
 652
 653                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
 654                 if (s->native_fd < 0) {
 655                         log_error("socket() failed: %m");
 656                         return -errno;
 657                 }
 658
 659                 zero(sa);
 660                 sa.un.sun_family = AF_UNIX;
 661                 strncpy(sa.un.sun_path, "/run/systemd/journal", sizeof(sa.un.sun_path));
 662
 663                 unlink(sa.un.sun_path);
 664
 665                 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
 666                 if (r < 0) {
 667                         log_error("bind() failed: %m");
 668                         return -errno;
 669                 }
 670
 671                 chmod(sa.un.sun_path, 0666);
 672         }
 673
 674         one = 1;
 675         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
 676         if (r < 0) {
 677                 log_error("SO_PASSCRED failed: %m");
 678                 return -errno;
 679         }
 680
 681         one = 1;
 682         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
 683         if (r < 0) {
 684                 log_error("SO_TIMESTAMP failed: %m");
 685                 return -errno;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static int server_init(Server *s) {
 692         int n, r, fd;
 693         struct epoll_event ev;
 694         sigset_t mask;
 695
 696         assert(s);
 697
 698         zero(*s);
 699         s->syslog_fd = s->native_fd = s->signal_fd = -1;
 700
 701         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
 702         if (s->epoll_fd < 0) {
 703                 log_error("Failed to create epoll object: %m");
 704                 return -errno;
 705         }
 706
 707         n = sd_listen_fds(true);
 708         if (n < 0) {
 709                 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
 710                 return n;
 711         }
 712
 713         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
 714
 715                 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
 716
 717                         if (s->syslog_fd >= 0) {
 718                                 log_error("Too many /dev/log sockets passed.");
 719                                 return -EINVAL;
 720                         }
 721
 722                         s->syslog_fd = fd;
 723
 724                 } else if (sd_is_socket(fd, AF_UNIX, SOCK_DGRAM, -1) > 0) {
 725
 726                         if (s->native_fd >= 0) {
 727                                 log_error("Too many native sockets passed.");
 728                                 return -EINVAL;
 729                         }
 730
 731                         s->native_fd = fd;
 732                 } else {
 733                         log_error("Unknown socket passed.");
 734                         return -EINVAL;
 735                 }
 736         }
 737
 738         r = open_syslog_socket(s);
 739         if (r < 0)
 740                 return r;
 741
 742         zero(ev);
 743         ev.events = EPOLLIN;
 744         ev.data.fd = s->syslog_fd;
 745         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
 746                 log_error("Failed to add syslog server fd to epoll object: %m");
 747                 return -errno;
 748         }
 749
 750         r = open_native_socket(s);
 751         if (r < 0)
 752                 return r;
 753
 754         zero(ev);
 755         ev.events = EPOLLIN;
 756         ev.data.fd = s->native_fd;
 757         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
 758                 log_error("Failed to add native server fd to epoll object: %m");
 759                 return -errno;
 760         }
 761
 762         s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
 763         if (!s->user_journals) {
 764                 log_error("Out of memory.");
 765                 return -ENOMEM;
 766         }
 767
 768         r = system_journal_open(s);
 769         if (r < 0)
 770                 return r;
 771
 772         assert_se(sigemptyset(&mask) == 0);
 773         sigset_add_many(&mask, SIGINT, SIGTERM, -1);
 774         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 775
 776         s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
 777         if (s->signal_fd < 0) {
 778                 log_error("signalfd(): %m");
 779                 return -errno;
 780         }
 781
 782         zero(ev);
 783         ev.events = EPOLLIN;
 784         ev.data.fd = s->signal_fd;
 785
 786         if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
 787                 log_error("epoll_ctl(): %m");
 788                 return -errno;
 789         }
 790
 791         return 0;
 792 }
 793
 794 static void server_done(Server *s) {
 795         JournalFile *f;
 796         assert(s);
 797
 798         if (s->system_journal)
 799                 journal_file_close(s->system_journal);
 800
 801         if (s->runtime_journal)
 802                 journal_file_close(s->runtime_journal);
 803
 804         while ((f = hashmap_steal_first(s->user_journals)))
 805                 journal_file_close(f);
 806
 807         hashmap_free(s->user_journals);
 808
 809         if (s->epoll_fd >= 0)
 810                 close_nointr_nofail(s->epoll_fd);
 811
 812         if (s->signal_fd >= 0)
 813                 close_nointr_nofail(s->signal_fd);
 814
 815         if (s->syslog_fd >= 0)
 816                 close_nointr_nofail(s->syslog_fd);
 817
 818         if (s->native_fd >= 0)
 819                 close_nointr_nofail(s->native_fd);
 820 }
 821
 822 int main(int argc, char *argv[]) {
 823         Server server;
 824         int r;
 825
 826         /* if (getppid() != 1) { */
 827         /*         log_error("This program should be invoked by init only."); */
 828         /*         return EXIT_FAILURE; */
 829         /* } */
 830
 831         if (argc > 1) {
 832                 log_error("This program does not take arguments.");
 833                 return EXIT_FAILURE;
 834         }
 835
 836         log_set_target(LOG_TARGET_CONSOLE);
 837         log_parse_environment();
 838         log_open();
 839
 840         umask(0022);
 841
 842         r = server_init(&server);
 843         if (r < 0)
 844                 goto finish;
 845
 846         log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
 847
 848         sd_notify(false,
 849                   "READY=1\n"
 850                   "STATUS=Processing messages...");
 851 #
 852         for (;;) {
 853                 struct epoll_event event;
 854
 855                 r = epoll_wait(server.epoll_fd, &event, 1, -1);
 856                 if (r < 0) {
 857
 858                         if (errno == EINTR)
 859                                 continue;
 860
 861                         log_error("epoll_wait() failed: %m");
 862                         r = -errno;
 863                         goto finish;
 864                 } else if (r == 0)
 865                         break;
 866
 867                 r = process_event(&server, &event);
 868                 if (r < 0)
 869                         goto finish;
 870                 else if (r == 0)
 871                         break;
 872         }
 873
 874 finish:
 875         sd_notify(false,
 876                   "STATUS=Shutting down...");
 877
 878         server_done(&server);
 879
 880         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 881 }