src/journal/journal-remote.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2012 Zbigniew Jędrzejewski-Szmek
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <inttypes.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/prctl.h>
  29 #include <sys/socket.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include <getopt.h>
  34
  35 #include "sd-daemon.h"
  36 #include "sd-event.h"
  37 #include "journal-file.h"
  38 #include "journald-native.h"
  39 #include "socket-util.h"
  40 #include "mkdir.h"
  41 #include "build.h"
  42 #include "macro.h"
  43 #include "strv.h"
  44 #include "fileio.h"
  45 #include "socket-util.h"
  46 #include "microhttpd-util.h"
  47
  48 #ifdef HAVE_GNUTLS
  49 #include <gnutls/gnutls.h>
  50 #endif
  51
  52 #include "journal-remote-parse.h"
  53 #include "journal-remote-write.h"
  54
  55 #define REMOTE_JOURNAL_PATH "/var/log/journal/" SD_ID128_FORMAT_STR "/remote-%s.journal"
  56
  57 static char* arg_output = NULL;
  58 static char* arg_url = NULL;
  59 static char* arg_getter = NULL;
  60 static char* arg_listen_raw = NULL;
  61 static char* arg_listen_http = NULL;
  62 static char* arg_listen_https = NULL;
  63 static char** arg_files = NULL;
  64 static int arg_compress = true;
  65 static int arg_seal = false;
  66 static int http_socket = -1, https_socket = -1;
  67
  68 static char *key_pem = NULL;
  69 static char *cert_pem = NULL;
  70 static char *trust_pem = NULL;
  71
  72 /**********************************************************************
  73  **********************************************************************
  74  **********************************************************************/
  75
  76 static int spawn_child(const char* child, char** argv) {
  77         int fd[2];
  78         pid_t parent_pid, child_pid;
  79         int r;
  80
  81         if (pipe(fd) < 0) {
  82                 log_error("Failed to create pager pipe: %m");
  83                 return -errno;
  84         }
  85
  86         parent_pid = getpid();
  87
  88         child_pid = fork();
  89         if (child_pid < 0) {
  90                 r = -errno;
  91                 log_error("Failed to fork: %m");
  92                 safe_close_pair(fd);
  93                 return r;
  94         }
  95
  96         /* In the child */
  97         if (child_pid == 0) {
  98                 r = dup2(fd[1], STDOUT_FILENO);
  99                 if (r < 0) {
 100                         log_error("Failed to dup pipe to stdout: %m");
 101                         _exit(EXIT_FAILURE);
 102                 }
 103
 104                 safe_close_pair(fd);
 105
 106                 /* Make sure the child goes away when the parent dies */
 107                 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
 108                         _exit(EXIT_FAILURE);
 109
 110                 /* Check whether our parent died before we were able
 111                  * to set the death signal */
 112                 if (getppid() != parent_pid)
 113                         _exit(EXIT_SUCCESS);
 114
 115                 execvp(child, argv);
 116                 log_error("Failed to exec child %s: %m", child);
 117                 _exit(EXIT_FAILURE);
 118         }
 119
 120         r = close(fd[1]);
 121         if (r < 0)
 122                 log_warning("Failed to close write end of pipe: %m");
 123
 124         return fd[0];
 125 }
 126
 127 static int spawn_curl(char* url) {
 128         char **argv = STRV_MAKE("curl",
 129                                 "-HAccept: application/vnd.fdo.journal",
 130                                 "--silent",
 131                                 "--show-error",
 132                                 url);
 133         int r;
 134
 135         r = spawn_child("curl", argv);
 136         if (r < 0)
 137                 log_error("Failed to spawn curl: %m");
 138         return r;
 139 }
 140
 141 static int spawn_getter(char *getter, char *url) {
 142         int r;
 143         char _cleanup_strv_free_ **words = NULL;
 144
 145         assert(getter);
 146         words = strv_split_quoted(getter);
 147         if (!words)
 148                 return log_oom();
 149
 150         r = spawn_child(words[0], words);
 151         if (r < 0)
 152                 log_error("Failed to spawn getter %s: %m", getter);
 153
 154         return r;
 155 }
 156
 157 static int open_output(Writer *s, const char* url) {
 158         char _cleanup_free_ *name, *output = NULL;
 159         char *c;
 160         int r;
 161
 162         assert(url);
 163         name = strdup(url);
 164         if (!name)
 165                 return log_oom();
 166
 167         for(c = name; *c; c++) {
 168                 if (*c == '/' || *c == ':' || *c == ' ')
 169                         *c = '~';
 170                 else if (*c == '?') {
 171                         *c = '\0';
 172                         break;
 173                 }
 174         }
 175
 176         if (!arg_output) {
 177                 sd_id128_t machine;
 178                 r = sd_id128_get_machine(&machine);
 179                 if (r < 0) {
 180                         log_error("failed to determine machine ID128: %s", strerror(-r));
 181                         return r;
 182                 }
 183
 184                 r = asprintf(&output, REMOTE_JOURNAL_PATH,
 185                              SD_ID128_FORMAT_VAL(machine), name);
 186                 if (r < 0)
 187                         return log_oom();
 188         } else {
 189                 r = is_dir(arg_output);
 190                 if (r > 0) {
 191                         r = asprintf(&output,
 192                                      "%s/remote-%s.journal", arg_output, name);
 193                         if (r < 0)
 194                                 return log_oom();
 195                 } else {
 196                         output = strdup(arg_output);
 197                         if (!output)
 198                                 return log_oom();
 199                 }
 200         }
 201
 202         r = journal_file_open_reliably(output,
 203                                        O_RDWR|O_CREAT, 0640,
 204                                        arg_compress, arg_seal,
 205                                        &s->metrics,
 206                                        s->mmap,
 207                                        NULL, &s->journal);
 208         if (r < 0)
 209                 log_error("Failed to open output journal %s: %s",
 210                           arg_output, strerror(-r));
 211         else
 212                 log_info("Opened output file %s", s->journal->path);
 213         return r;
 214 }
 215
 216 /**********************************************************************
 217  **********************************************************************
 218  **********************************************************************/
 219
 220 typedef struct MHDDaemonWrapper {
 221         uint64_t fd;
 222         struct MHD_Daemon *daemon;
 223
 224         sd_event_source *event;
 225 } MHDDaemonWrapper;
 226
 227 typedef struct RemoteServer {
 228         RemoteSource **sources;
 229         size_t sources_size;
 230         size_t active;
 231
 232         sd_event *events;
 233         sd_event_source *sigterm_event, *sigint_event, *listen_event;
 234
 235         Writer writer;
 236
 237         Hashmap *daemons;
 238 } RemoteServer;
 239
 240 /* This should go away as soon as µhttpd allows state to be passed around. */
 241 static RemoteServer *server;
 242
 243 static int dispatch_raw_source_event(sd_event_source *event,
 244                                      int fd,
 245                                      uint32_t revents,
 246                                      void *userdata);
 247 static int dispatch_raw_connection_event(sd_event_source *event,
 248                                          int fd,
 249                                          uint32_t revents,
 250                                          void *userdata);
 251 static int dispatch_http_event(sd_event_source *event,
 252                                int fd,
 253                                uint32_t revents,
 254                                void *userdata);
 255
 256 static int get_source_for_fd(RemoteServer *s, int fd, RemoteSource **source) {
 257         assert(fd >= 0);
 258         assert(source);
 259
 260         if (!GREEDY_REALLOC0(s->sources, s->sources_size, fd + 1))
 261                 return log_oom();
 262
 263         if (s->sources[fd] == NULL) {
 264                 s->sources[fd] = new0(RemoteSource, 1);
 265                 if (!s->sources[fd])
 266                         return log_oom();
 267                 s->sources[fd]->fd = -1;
 268                 s->active++;
 269         }
 270
 271         *source = s->sources[fd];
 272         return 0;
 273 }
 274
 275 static int remove_source(RemoteServer *s, int fd) {
 276         RemoteSource *source;
 277
 278         assert(s);
 279         assert(fd >= 0 && fd < (ssize_t) s->sources_size);
 280
 281         source = s->sources[fd];
 282         if (source) {
 283                 source_free(source);
 284                 s->sources[fd] = NULL;
 285                 s->active--;
 286         }
 287
 288         close(fd);
 289
 290         return 0;
 291 }
 292
 293 static int add_source(RemoteServer *s, int fd, const char* name) {
 294         RemoteSource *source = NULL;
 295         char *realname;
 296         int r;
 297
 298         assert(s);
 299         assert(fd >= 0);
 300
 301         if (name) {
 302                 realname = strdup(name);
 303                 if (!realname)
 304                         return log_oom();
 305         } else {
 306                 r = asprintf(&realname, "fd:%d", fd);
 307                 if (r < 0)
 308                         return log_oom();
 309         }
 310
 311         log_debug("Creating source for fd:%d (%s)", fd, name);
 312
 313         r = get_source_for_fd(s, fd, &source);
 314         if (r < 0) {
 315                 log_error("Failed to create source for fd:%d (%s)", fd, name);
 316                 return r;
 317         }
 318         assert(source);
 319         assert(source->fd < 0);
 320         source->fd = fd;
 321
 322         r = sd_event_add_io(s->events, &source->event,
 323                             fd, EPOLLIN, dispatch_raw_source_event, s);
 324         if (r < 0) {
 325                 log_error("Failed to register event source for fd:%d: %s",
 326                           fd, strerror(-r));
 327                 goto error;
 328         }
 329
 330         return 1; /* work to do */
 331
 332  error:
 333         remove_source(s, fd);
 334         return r;
 335 }
 336
 337 static int add_raw_socket(RemoteServer *s, int fd) {
 338         int r;
 339
 340         r = sd_event_add_io(s->events, &s->listen_event, fd, EPOLLIN,
 341                             dispatch_raw_connection_event, s);
 342         if (r < 0) {
 343                 close(fd);
 344                 return r;
 345         }
 346
 347         s->active ++;
 348         return 0;
 349 }
 350
 351 static int setup_raw_socket(RemoteServer *s, const char *address) {
 352         int fd;
 353
 354         fd = make_socket_fd(LOG_INFO, address, SOCK_STREAM | SOCK_CLOEXEC);
 355         if (fd < 0)
 356                 return fd;
 357
 358         return add_raw_socket(s, fd);
 359 }
 360
 361 /**********************************************************************
 362  **********************************************************************
 363  **********************************************************************/
 364
 365 static RemoteSource *request_meta(void **connection_cls) {
 366         RemoteSource *source;
 367
 368         assert(connection_cls);
 369         if (*connection_cls)
 370                 return *connection_cls;
 371
 372         source = new0(RemoteSource, 1);
 373         if (!source)
 374                 return NULL;
 375         source->fd = -1;
 376
 377         log_debug("Added RemoteSource as connection metadata %p", source);
 378
 379         *connection_cls = source;
 380         return source;
 381 }
 382
 383 static void request_meta_free(void *cls,
 384                               struct MHD_Connection *connection,
 385                               void **connection_cls,
 386                               enum MHD_RequestTerminationCode toe) {
 387         RemoteSource *s;
 388
 389         assert(connection_cls);
 390         s = *connection_cls;
 391
 392         log_debug("Cleaning up connection metadata %p", s);
 393         source_free(s);
 394         *connection_cls = NULL;
 395 }
 396
 397 static int process_http_upload(
 398                 struct MHD_Connection *connection,
 399                 const char *upload_data,
 400                 size_t *upload_data_size,
 401                 RemoteSource *source) {
 402
 403         bool finished = false;
 404         int r;
 405
 406         assert(source);
 407
 408         log_debug("request_handler_upload: connection %p, %zu bytes",
 409                   connection, *upload_data_size);
 410
 411         if (*upload_data_size) {
 412                 log_info("Received %zu bytes", *upload_data_size);
 413
 414                 r = push_data(source, upload_data, *upload_data_size);
 415                 if (r < 0) {
 416                         log_error("Failed to store received data of size %zu: %s",
 417                                   *upload_data_size, strerror(-r));
 418                         return mhd_respond_oom(connection);
 419                 }
 420                 *upload_data_size = 0;
 421         } else
 422                 finished = true;
 423
 424         while (true) {
 425                 r = process_source(source, &server->writer, arg_compress, arg_seal);
 426                 if (r == -E2BIG)
 427                         log_warning("Entry too big, skipped");
 428                 else if (r == -EAGAIN || r == -EWOULDBLOCK)
 429                         break;
 430                 else if (r < 0) {
 431                         log_warning("Failed to process data for connection %p", connection);
 432                         return mhd_respondf(connection, MHD_HTTP_UNPROCESSABLE_ENTITY,
 433                                             "Processing failed: %s", strerror(-r));
 434                 }
 435         }
 436
 437         if (!finished)
 438                 return MHD_YES;
 439
 440         /* The upload is finished */
 441
 442         if (source_non_empty(source)) {
 443                 log_warning("EOF reached with incomplete data");
 444                 return mhd_respond(connection, MHD_HTTP_EXPECTATION_FAILED,
 445                                    "Trailing data not processed.");
 446         }
 447
 448         return mhd_respond(connection, MHD_HTTP_ACCEPTED, "OK.\n");
 449 };
 450
 451 static int request_handler(
 452                 void *cls,
 453                 struct MHD_Connection *connection,
 454                 const char *url,
 455                 const char *method,
 456                 const char *version,
 457                 const char *upload_data,
 458                 size_t *upload_data_size,
 459                 void **connection_cls) {
 460
 461         const char *header;
 462         int r ,code;
 463
 464         assert(connection);
 465         assert(connection_cls);
 466         assert(url);
 467         assert(method);
 468
 469         log_debug("Handling a connection %s %s %s", method, url, version);
 470
 471         if (*connection_cls)
 472                 return process_http_upload(connection,
 473                                            upload_data, upload_data_size,
 474                                            *connection_cls);
 475
 476         if (!streq(method, "POST"))
 477                 return mhd_respond(connection, MHD_HTTP_METHOD_NOT_ACCEPTABLE,
 478                                    "Unsupported method.\n");
 479
 480         if (!streq(url, "/upload"))
 481                 return mhd_respond(connection, MHD_HTTP_NOT_FOUND,
 482                                    "Not found.\n");
 483
 484         header = MHD_lookup_connection_value(connection,
 485                                              MHD_HEADER_KIND, "Content-Type");
 486         if (!header || !streq(header, "application/vnd.fdo.journal"))
 487                 return mhd_respond(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
 488                                    "Content-Type: application/vnd.fdo.journal"
 489                                    " is required.\n");
 490
 491         if (trust_pem) {
 492                 r = check_permissions(connection, &code);
 493                 if (r < 0)
 494                         return code;
 495         }
 496
 497         if (!request_meta(connection_cls))
 498                 return respond_oom(connection);
 499         return MHD_YES;
 500 }
 501
 502 static int setup_microhttpd_server(RemoteServer *s, int fd, bool https) {
 503         struct MHD_OptionItem opts[] = {
 504                 { MHD_OPTION_NOTIFY_COMPLETED, (intptr_t) request_meta_free},
 505                 { MHD_OPTION_EXTERNAL_LOGGER, (intptr_t) microhttpd_logger},
 506                 { MHD_OPTION_LISTEN_SOCKET, fd},
 507                 { MHD_OPTION_END},
 508                 { MHD_OPTION_END},
 509                 { MHD_OPTION_END},
 510                 { MHD_OPTION_END}};
 511         int opts_pos = 3;
 512         int flags =
 513                 MHD_USE_DEBUG |
 514                 MHD_USE_PEDANTIC_CHECKS |
 515                 MHD_USE_EPOLL_LINUX_ONLY |
 516                 MHD_USE_DUAL_STACK;
 517
 518         const union MHD_DaemonInfo *info;
 519         int r, epoll_fd;
 520         MHDDaemonWrapper *d;
 521
 522         assert(fd >= 0);
 523
 524         r = fd_nonblock(fd, true);
 525         if (r < 0) {
 526                 log_error("Failed to make fd:%d nonblocking: %s", fd, strerror(-r));
 527                 return r;
 528         }
 529
 530         if (https) {
 531                 opts[opts_pos++] = (struct MHD_OptionItem)
 532                         {MHD_OPTION_HTTPS_MEM_KEY, 0, key_pem};
 533                 opts[opts_pos++] = (struct MHD_OptionItem)
 534                         {MHD_OPTION_HTTPS_MEM_CERT, 0, cert_pem};
 535
 536                 flags |= MHD_USE_SSL;
 537
 538                 if (trust_pem)
 539                         opts[opts_pos++] = (struct MHD_OptionItem)
 540                                 {MHD_OPTION_HTTPS_MEM_TRUST, 0, trust_pem};
 541         }
 542
 543         d = new(MHDDaemonWrapper, 1);
 544         if (!d)
 545                 return log_oom();
 546
 547         d->fd = (uint64_t) fd;
 548
 549         d->daemon = MHD_start_daemon(flags, 0,
 550                                      NULL, NULL,
 551                                      request_handler, NULL,
 552                                      MHD_OPTION_ARRAY, opts,
 553                                      MHD_OPTION_END);
 554         if (!d->daemon) {
 555                 log_error("Failed to start µhttp daemon");
 556                 r = -EINVAL;
 557                 goto error;
 558         }
 559
 560         log_debug("Started MHD %s daemon on fd:%d (wrapper @ %p)",
 561                   https ? "HTTPS" : "HTTP", fd, d);
 562
 563
 564         info = MHD_get_daemon_info(d->daemon, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
 565         if (!info) {
 566                 log_error("µhttp returned NULL daemon info");
 567                 r = -ENOTSUP;
 568                 goto error;
 569         }
 570
 571         epoll_fd = info->listen_fd;
 572         if (epoll_fd < 0) {
 573                 log_error("µhttp epoll fd is invalid");
 574                 r = -EUCLEAN;
 575                 goto error;
 576         }
 577
 578         r = sd_event_add_io(s->events, &d->event,
 579                             epoll_fd, EPOLLIN, dispatch_http_event, d);
 580         if (r < 0) {
 581                 log_error("Failed to add event callback: %s", strerror(-r));
 582                 goto error;
 583         }
 584
 585         r = hashmap_ensure_allocated(&s->daemons, uint64_hash_func, uint64_compare_func);
 586         if (r < 0) {
 587                 log_oom();
 588                 goto error;
 589         }
 590
 591         r = hashmap_put(s->daemons, &d->fd, d);
 592         if (r < 0) {
 593                 log_error("Failed to add daemon to hashmap: %s", strerror(-r));
 594                 goto error;
 595         }
 596
 597         s->active ++;
 598         return 0;
 599
 600 error:
 601         MHD_stop_daemon(d->daemon);
 602         free(d->daemon);
 603         free(d);
 604         return r;
 605 }
 606
 607 static int setup_microhttpd_socket(RemoteServer *s,
 608                                    const char *address,
 609                                    bool https) {
 610         int fd;
 611
 612         fd = make_socket_fd(LOG_INFO, address, SOCK_STREAM | SOCK_CLOEXEC);
 613         if (fd < 0)
 614                 return fd;
 615
 616         return setup_microhttpd_server(s, fd, https);
 617 }
 618
 619 static int dispatch_http_event(sd_event_source *event,
 620                                int fd,
 621                                uint32_t revents,
 622                                void *userdata) {
 623         MHDDaemonWrapper *d = userdata;
 624         int r;
 625
 626         assert(d);
 627
 628         log_info("%s", __func__);
 629
 630         r = MHD_run(d->daemon);
 631         if (r == MHD_NO) {
 632                 log_error("MHD_run failed!");
 633                 // XXX: unregister daemon
 634                 return -EINVAL;
 635         }
 636
 637         return 1; /* work to do */
 638 }
 639
 640 /**********************************************************************
 641  **********************************************************************
 642  **********************************************************************/
 643
 644 static int dispatch_sigterm(sd_event_source *event,
 645                             const struct signalfd_siginfo *si,
 646                             void *userdata) {
 647         RemoteServer *s = userdata;
 648
 649         assert(s);
 650
 651         log_received_signal(LOG_INFO, si);
 652
 653         sd_event_exit(s->events, 0);
 654         return 0;
 655 }
 656
 657 static int setup_signals(RemoteServer *s) {
 658         sigset_t mask;
 659         int r;
 660
 661         assert(s);
 662
 663         assert_se(sigemptyset(&mask) == 0);
 664         sigset_add_many(&mask, SIGINT, SIGTERM, -1);
 665         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 666
 667         r = sd_event_add_signal(s->events, &s->sigterm_event, SIGTERM, dispatch_sigterm, s);
 668         if (r < 0)
 669                 return r;
 670
 671         r = sd_event_add_signal(s->events, &s->sigint_event, SIGINT, dispatch_sigterm, s);
 672         if (r < 0)
 673                 return r;
 674
 675         return 0;
 676 }
 677
 678 static int fd_fd(const char *spec) {
 679         int fd, r;
 680
 681         r = safe_atoi(spec, &fd);
 682         if (r < 0)
 683                 return r;
 684
 685         if (fd >= 0)
 686                 return -ENOENT;
 687
 688         return -fd;
 689 }
 690
 691
 692 static int remoteserver_init(RemoteServer *s) {
 693         int r, n, fd;
 694         const char *output_name = NULL;
 695         char **file;
 696
 697         assert(s);
 698
 699         sd_event_default(&s->events);
 700
 701         setup_signals(s);
 702
 703         assert(server == NULL);
 704         server = s;
 705
 706         n = sd_listen_fds(true);
 707         if (n < 0) {
 708                 log_error("Failed to read listening file descriptors from environment: %s",
 709                           strerror(-n));
 710                 return n;
 711         } else
 712                 log_info("Received %d descriptors", n);
 713
 714         if (MAX(http_socket, https_socket) >= SD_LISTEN_FDS_START + n) {
 715                 log_error("Received fewer sockets than expected");
 716                 return -EBADFD;
 717         }
 718
 719         for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
 720                 if (sd_is_socket(fd, AF_UNSPEC, 0, false)) {
 721                         log_info("Received a listening socket (fd:%d)", fd);
 722
 723                         if (fd == http_socket)
 724                                 r = setup_microhttpd_server(s, fd, false);
 725                         else if (fd == https_socket)
 726                                 r = setup_microhttpd_server(s, fd, true);
 727                         else
 728                                 r = add_raw_socket(s, fd);
 729                 } else if (sd_is_socket(fd, AF_UNSPEC, 0, true)) {
 730                         log_info("Received a connection socket (fd:%d)", fd);
 731
 732                         r = add_source(s, fd, NULL);
 733                 } else {
 734                         log_error("Unknown socket passed on fd:%d", fd);
 735
 736                         return -EINVAL;
 737                 }
 738
 739                 if(r < 0) {
 740                         log_error("Failed to register socket (fd:%d): %s",
 741                                   fd, strerror(-r));
 742                         return r;
 743                 }
 744
 745                 output_name = "socket";
 746         }
 747
 748         if (arg_url) {
 749                 char _cleanup_free_ *url = NULL;
 750                 char _cleanup_strv_free_ **urlv = strv_new(arg_url, "/entries", NULL);
 751                 if (!urlv)
 752                         return log_oom();
 753                 url = strv_join(urlv, "");
 754                 if (!url)
 755                         return log_oom();
 756
 757                 if (arg_getter) {
 758                         log_info("Spawning getter %s...", url);
 759                         fd = spawn_getter(arg_getter, url);
 760                 } else {
 761                         log_info("Spawning curl %s...", url);
 762                         fd = spawn_curl(url);
 763                 }
 764                 if (fd < 0)
 765                         return fd;
 766
 767                 r = add_source(s, fd, arg_url);
 768                 if (r < 0)
 769                         return r;
 770
 771                 output_name = arg_url;
 772         }
 773
 774         if (arg_listen_raw) {
 775                 log_info("Listening on a socket...");
 776                 r = setup_raw_socket(s, arg_listen_raw);
 777                 if (r < 0)
 778                         return r;
 779
 780                 output_name = arg_listen_raw;
 781         }
 782
 783         if (arg_listen_http) {
 784                 r = setup_microhttpd_socket(s, arg_listen_http, false);
 785                 if (r < 0)
 786                         return r;
 787
 788                 output_name = arg_listen_http;
 789         }
 790
 791         if (arg_listen_https) {
 792                 r = setup_microhttpd_socket(s, arg_listen_https, true);
 793                 if (r < 0)
 794                         return r;
 795
 796                 output_name = arg_listen_https;
 797         }
 798
 799         STRV_FOREACH(file, arg_files) {
 800                 if (streq(*file, "-")) {
 801                         log_info("Reading standard input...");
 802
 803                         fd = STDIN_FILENO;
 804                         output_name = "stdin";
 805                 } else {
 806                         log_info("Reading file %s...", *file);
 807
 808                         fd = open(*file, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
 809                         if (fd < 0) {
 810                                 log_error("Failed to open %s: %m", *file);
 811                                 return -errno;
 812                         }
 813                         output_name = *file;
 814                 }
 815
 816                 r = add_source(s, fd, output_name);
 817                 if (r < 0)
 818                         return r;
 819         }
 820
 821         if (s->active == 0) {
 822                 log_error("Zarro sources specified");
 823                 return -EINVAL;
 824         }
 825
 826         if (!!n + !!arg_url + !!arg_listen_raw + !!arg_files)
 827                 output_name = "multiple";
 828
 829         r = writer_init(&s->writer);
 830         if (r < 0)
 831                 return r;
 832
 833         r = open_output(&s->writer, output_name);
 834         return r;
 835 }
 836
 837 static int server_destroy(RemoteServer *s) {
 838         int r;
 839         size_t i;
 840         MHDDaemonWrapper *d;
 841
 842         r = writer_close(&s->writer);
 843
 844         while ((d = hashmap_steal_first(s->daemons))) {
 845                 MHD_stop_daemon(d->daemon);
 846                 sd_event_source_unref(d->event);
 847                 free(d);
 848         }
 849
 850         hashmap_free(s->daemons);
 851
 852         assert(s->sources_size == 0 || s->sources);
 853         for (i = 0; i < s->sources_size; i++)
 854                 remove_source(s, i);
 855
 856         free(s->sources);
 857
 858         sd_event_source_unref(s->sigterm_event);
 859         sd_event_source_unref(s->sigint_event);
 860         sd_event_source_unref(s->listen_event);
 861         sd_event_unref(s->events);
 862
 863         /* fds that we're listening on remain open... */
 864
 865         return r;
 866 }
 867
 868 /**********************************************************************
 869  **********************************************************************
 870  **********************************************************************/
 871
 872 static int dispatch_raw_source_event(sd_event_source *event,
 873                                      int fd,
 874                                      uint32_t revents,
 875                                      void *userdata) {
 876
 877         RemoteServer *s = userdata;
 878         RemoteSource *source;
 879         int r;
 880
 881         assert(fd >= 0 && fd < (ssize_t) s->sources_size);
 882         source = s->sources[fd];
 883         assert(source->fd == fd);
 884
 885         r = process_source(source, &s->writer, arg_compress, arg_seal);
 886         if (source->state == STATE_EOF) {
 887                 log_info("EOF reached with source fd:%d (%s)",
 888                          source->fd, source->name);
 889                 if (source_non_empty(source))
 890                         log_warning("EOF reached with incomplete data");
 891                 remove_source(s, source->fd);
 892                 log_info("%zd active source remaining", s->active);
 893         } else if (r == -E2BIG) {
 894                 log_error("Entry too big, skipped");
 895                 r = 1;
 896         }
 897
 898         return r;
 899 }
 900
 901 static int accept_connection(const char* type, int fd, SocketAddress *addr) {
 902         int fd2, r;
 903
 904         log_debug("Accepting new %s connection on fd:%d", type, fd);
 905         fd2 = accept4(fd, &addr->sockaddr.sa, &addr->size, SOCK_NONBLOCK|SOCK_CLOEXEC);
 906         if (fd2 < 0) {
 907                 log_error("accept() on fd:%d failed: %m", fd);
 908                 return -errno;
 909         }
 910
 911         switch(socket_address_family(addr)) {
 912         case AF_INET:
 913         case AF_INET6: {
 914                 char* _cleanup_free_ a = NULL;
 915
 916                 r = socket_address_print(addr, &a);
 917                 if (r < 0) {
 918                         log_error("socket_address_print(): %s", strerror(-r));
 919                         close(fd2);
 920                         return r;
 921                 }
 922
 923                 log_info("Accepted %s %s connection from %s",
 924                          type,
 925                          socket_address_family(addr) == AF_INET ? "IP" : "IPv6",
 926                          a);
 927
 928                 return fd2;
 929         };
 930         default:
 931                 log_error("Rejected %s connection with unsupported family %d",
 932                           type, socket_address_family(addr));
 933                 close(fd2);
 934
 935                 return -EINVAL;
 936         }
 937 }
 938
 939 static int dispatch_raw_connection_event(sd_event_source *event,
 940                                          int fd,
 941                                          uint32_t revents,
 942                                          void *userdata) {
 943         RemoteServer *s = userdata;
 944         int fd2;
 945         SocketAddress addr = {
 946                 .size = sizeof(union sockaddr_union),
 947                 .type = SOCK_STREAM,
 948         };
 949
 950         fd2 = accept_connection("raw", fd, &addr);
 951         if (fd2 < 0)
 952                 return fd2;
 953
 954         return add_source(s, fd2, NULL);
 955 }
 956
 957 /**********************************************************************
 958  **********************************************************************
 959  **********************************************************************/
 960
 961 static int help(void) {
 962         printf("%s [OPTIONS...] {FILE|-}...\n\n"
 963                "Write external journal events to a journal file.\n\n"
 964                "Options:\n"
 965                "  --url=URL            Read events from systemd-journal-gatewayd at URL\n"
 966                "  --getter=COMMAND     Read events from the output of COMMAND\n"
 967                "  --listen-raw=ADDR    Listen for connections at ADDR\n"
 968                "  --listen-http=ADDR   Listen for HTTP connections at ADDR\n"
 969                "  --listen-https=ADDR  Listen for HTTPS connections at ADDR\n"
 970                "  -o --output=FILE|DIR Write output to FILE or DIR/external-*.journal\n"
 971                "  --[no-]compress      Use XZ-compression in the output journal (default: yes)\n"
 972                "  --[no-]seal          Use Event sealing in the output journal (default: no)\n"
 973                "  -h --help            Show this help and exit\n"
 974                "  --version            Print version string and exit\n"
 975                "\n"
 976                "Note: file descriptors from sd_listen_fds() will be consumed, too.\n"
 977                , program_invocation_short_name);
 978
 979         return 0;
 980 }
 981
 982 static int parse_argv(int argc, char *argv[]) {
 983         enum {
 984                 ARG_VERSION = 0x100,
 985                 ARG_URL,
 986                 ARG_LISTEN_RAW,
 987                 ARG_LISTEN_HTTP,
 988                 ARG_LISTEN_HTTPS,
 989                 ARG_GETTER,
 990                 ARG_COMPRESS,
 991                 ARG_NO_COMPRESS,
 992                 ARG_SEAL,
 993                 ARG_NO_SEAL,
 994                 ARG_KEY,
 995                 ARG_CERT,
 996                 ARG_TRUST,
 997         };
 998
 999         static const struct option options[] = {
1000                 { "help",         no_argument,       NULL, 'h'              },
1001                 { "version",      no_argument,       NULL, ARG_VERSION      },
1002                 { "url",          required_argument, NULL, ARG_URL          },
1003                 { "getter",       required_argument, NULL, ARG_GETTER       },
1004                 { "listen-raw",   required_argument, NULL, ARG_LISTEN_RAW   },
1005                 { "listen-http",  required_argument, NULL, ARG_LISTEN_HTTP  },
1006                 { "listen-https", required_argument, NULL, ARG_LISTEN_HTTPS },
1007                 { "output",       required_argument, NULL, 'o'              },
1008                 { "compress",     no_argument,       NULL, ARG_COMPRESS     },
1009                 { "no-compress",  no_argument,       NULL, ARG_NO_COMPRESS  },
1010                 { "seal",         no_argument,       NULL, ARG_SEAL         },
1011                 { "no-seal",      no_argument,       NULL, ARG_NO_SEAL      },
1012                 { "key",          required_argument, NULL, ARG_KEY          },
1013                 { "cert",         required_argument, NULL, ARG_CERT         },
1014                 { "trust",        required_argument, NULL, ARG_TRUST        },
1015                 {}
1016         };
1017
1018         int c, r;
1019
1020         assert(argc >= 0);
1021         assert(argv);
1022
1023         while ((c = getopt_long(argc, argv, "ho:", options, NULL)) >= 0)
1024                 switch(c) {
1025                 case 'h':
1026                         help();
1027                         return 0 /* done */;
1028
1029                 case ARG_VERSION:
1030                         puts(PACKAGE_STRING);
1031                         puts(SYSTEMD_FEATURES);
1032                         return 0 /* done */;
1033
1034                 case ARG_URL:
1035                         if (arg_url) {
1036                                 log_error("cannot currently set more than one --url");
1037                                 return -EINVAL;
1038                         }
1039
1040                         arg_url = optarg;
1041                         break;
1042
1043                 case ARG_GETTER:
1044                         if (arg_getter) {
1045                                 log_error("cannot currently use --getter more than once");
1046                                 return -EINVAL;
1047                         }
1048
1049                         arg_getter = optarg;
1050                         break;
1051
1052                 case ARG_LISTEN_RAW:
1053                         if (arg_listen_raw) {
1054                                 log_error("cannot currently use --listen-raw more than once");
1055                                 return -EINVAL;
1056                         }
1057
1058                         arg_listen_raw = optarg;
1059                         break;
1060
1061                 case ARG_LISTEN_HTTP:
1062                         if (arg_listen_http || http_socket >= 0) {
1063                                 log_error("cannot currently use --listen-http more than once");
1064                                 return -EINVAL;
1065                         }
1066
1067                         r = fd_fd(optarg);
1068                         if (r >= 0)
1069                                 http_socket = r;
1070                         else if (r == -ENOENT)
1071                                 arg_listen_http = optarg;
1072                         else {
1073                                 log_error("Invalid port/fd specification %s: %s",
1074                                           optarg, strerror(-r));
1075                                 return -EINVAL;
1076                         }
1077
1078                         break;
1079
1080                 case ARG_LISTEN_HTTPS:
1081                         if (arg_listen_https || https_socket >= 0) {
1082                                 log_error("cannot currently use --listen-https more than once");
1083                                 return -EINVAL;
1084                         }
1085
1086                         r = fd_fd(optarg);
1087                         if (r >= 0)
1088                                 https_socket = r;
1089                         else if (r == -ENOENT)
1090                                 arg_listen_https = optarg;
1091                         else {
1092                                 log_error("Invalid port/fd specification %s: %s",
1093                                           optarg, strerror(-r));
1094                                 return -EINVAL;
1095                         }
1096
1097                         break;
1098
1099                 case ARG_KEY:
1100                         if (key_pem) {
1101                                 log_error("Key file specified twice");
1102                                 return -EINVAL;
1103                         }
1104                         r = read_full_file(optarg, &key_pem, NULL);
1105                         if (r < 0) {
1106                                 log_error("Failed to read key file: %s", strerror(-r));
1107                                 return r;
1108                         }
1109                         assert(key_pem);
1110                         break;
1111
1112                 case ARG_CERT:
1113                         if (cert_pem) {
1114                                 log_error("Certificate file specified twice");
1115                                 return -EINVAL;
1116                         }
1117                         r = read_full_file(optarg, &cert_pem, NULL);
1118                         if (r < 0) {
1119                                 log_error("Failed to read certificate file: %s", strerror(-r));
1120                                 return r;
1121                         }
1122                         assert(cert_pem);
1123                         break;
1124
1125                 case ARG_TRUST:
1126 #ifdef HAVE_GNUTLS
1127                         if (trust_pem) {
1128                                 log_error("CA certificate file specified twice");
1129                                 return -EINVAL;
1130                         }
1131                         r = read_full_file(optarg, &trust_pem, NULL);
1132                         if (r < 0) {
1133                                 log_error("Failed to read CA certificate file: %s", strerror(-r));
1134                                 return r;
1135                         }
1136                         assert(trust_pem);
1137                         break;
1138 #else
1139                         log_error("Option --trust is not available.");
1140 #endif
1141
1142                 case 'o':
1143                         if (arg_output) {
1144                                 log_error("cannot use --output/-o more than once");
1145                                 return -EINVAL;
1146                         }
1147
1148                         arg_output = optarg;
1149                         break;
1150
1151                 case ARG_COMPRESS:
1152                         arg_compress = true;
1153                         break;
1154                 case ARG_NO_COMPRESS:
1155                         arg_compress = false;
1156                         break;
1157                 case ARG_SEAL:
1158                         arg_seal = true;
1159                         break;
1160                 case ARG_NO_SEAL:
1161                         arg_seal = false;
1162                         break;
1163
1164                 case '?':
1165                         return -EINVAL;
1166
1167                 default:
1168                         log_error("Unknown option code %c", c);
1169                         return -EINVAL;
1170                 }
1171
1172         if (arg_listen_https && !(key_pem && cert_pem)) {
1173                 log_error("Options --key and --cert must be used when https sources are specified");
1174                 return -EINVAL;
1175         }
1176
1177         if (optind < argc)
1178                 arg_files = argv + optind;
1179
1180         return 1 /* work to do */;
1181 }
1182
1183 static int setup_gnutls_logger(void) {
1184         if (!arg_listen_http && !arg_listen_https)
1185                 return 0;
1186
1187 #ifdef HAVE_GNUTLS
1188         gnutls_global_set_log_function(log_func_gnutls);
1189         gnutls_global_set_log_level(GNUTLS_LOG_LEVEL);
1190 #endif
1191
1192         return 0;
1193 }
1194
1195 int main(int argc, char **argv) {
1196         RemoteServer s = {};
1197         int r, r2;
1198
1199         log_set_max_level(LOG_DEBUG);
1200         log_show_color(true);
1201         log_parse_environment();
1202
1203         r = parse_argv(argc, argv);
1204         if (r <= 0)
1205                 return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
1206
1207         r = setup_gnutls_logger();
1208         if (r < 0)
1209                 return EXIT_FAILURE;
1210
1211         if (remoteserver_init(&s) < 0)
1212                 return EXIT_FAILURE;
1213
1214         log_debug("%s running as pid %lu",
1215                   program_invocation_short_name, (unsigned long) getpid());
1216         sd_notify(false,
1217                   "READY=1\n"
1218                   "STATUS=Processing requests...");
1219
1220         while (s.active) {
1221                 r = sd_event_get_state(s.events);
1222                 if (r < 0)
1223                         break;
1224                 if (r == SD_EVENT_FINISHED)
1225                         break;
1226
1227                 r = sd_event_run(s.events, -1);
1228                 if (r < 0) {
1229                         log_error("Failed to run event loop: %s", strerror(-r));
1230                         break;
1231                 }
1232         }
1233
1234         log_info("Finishing after writing %" PRIu64 " entries", s.writer.seqnum);
1235         r2 = server_destroy(&s);
1236
1237         sd_notify(false, "STATUS=Shutting down...");
1238
1239         return r >= 0 && r2 >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
1240 }