summaryrefslogtreecommitdiff
path: root/src/journal-remote/journal-remote.c
blob: 20be5420963dc0192217895f12af9ab42d6b02b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2012 Zbigniew Jędrzejewski-Szmek

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <unistd.h>

#ifdef HAVE_GNUTLS
#include <gnutls/gnutls.h>
#endif

#include "sd-daemon.h"

#include "alloc-util.h"
#include "conf-parser.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "journal-file.h"
#include "journal-remote-write.h"
#include "journal-remote.h"
#include "journald-native.h"
#include "macro.h"
#include "parse-util.h"
#include "signal-util.h"
#include "socket-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"

#define REMOTE_JOURNAL_PATH "/var/log/journal/remote"

#define PRIV_KEY_FILE CERTIFICATE_ROOT "/private/journal-remote.pem"
#define CERT_FILE     CERTIFICATE_ROOT "/certs/journal-remote.pem"
#define TRUST_FILE    CERTIFICATE_ROOT "/ca/trusted.pem"

static char* arg_url = NULL;
static char* arg_getter = NULL;
static char* arg_listen_raw = NULL;
static char* arg_listen_http = NULL;
static char* arg_listen_https = NULL;
static char** arg_files = NULL;
static int arg_compress = true;
static int arg_seal = false;
static int http_socket = -1, https_socket = -1;
static char** arg_gnutls_log = NULL;

static JournalWriteSplitMode arg_split_mode = JOURNAL_WRITE_SPLIT_HOST;
static char* arg_output = NULL;

static char *arg_key = NULL;
static char *arg_cert = NULL;
static char *arg_trust = NULL;
static bool arg_trust_all = false;

/**********************************************************************
 **********************************************************************
 **********************************************************************/

static int spawn_child(const char* child, char** argv) {
        int fd[2];
        pid_t parent_pid, child_pid;
        int r;

        if (pipe(fd) < 0)
                return log_error_errno(errno, "Failed to create pager pipe: %m");

        parent_pid = getpid();

        child_pid = fork();
        if (child_pid < 0) {
                r = log_error_errno(errno, "Failed to fork: %m");
                safe_close_pair(fd);
                return r;
        }

        /* In the child */
        if (child_pid == 0) {

                (void) reset_all_signal_handlers();
                (void) reset_signal_mask();

                r = dup2(fd[1], STDOUT_FILENO);
                if (r < 0) {
                        log_error_errno(errno, "Failed to dup pipe to stdout: %m");
                        _exit(EXIT_FAILURE);
                }

                safe_close_pair(fd);

                /* Make sure the child goes away when the parent dies */
                if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
                        _exit(EXIT_FAILURE);

                /* Check whether our parent died before we were able
                 * to set the death signal */
                if (getppid() != parent_pid)
                        _exit(EXIT_SUCCESS);

                execvp(child, argv);
                log_error_errno(errno, "Failed to exec child %s: %m", child);
                _exit(EXIT_FAILURE);
        }

        r = close(fd[1]);
        if (r < 0)
                log_warning_errno(errno, "Failed to close write end of pipe: %m");

        return fd[0];
}

static int spawn_curl(const char* url) {
        char **argv = STRV_MAKE("curl",
                                "-HAccept: application/vnd.fdo.journal",
                                "--silent",
                                "--show-error",
                                url);
        int r;

        r = spawn_child("curl", argv);
        if (r < 0)
                log_error_errno(errno, "Failed to spawn curl: %m");
        return r;
}

static int spawn_getter(const char *getter, const char *url) {
        int r;
        _cleanup_strv_free_ char **words = NULL;

        assert(getter);
        r = strv_split_extract(&words, getter, WHITESPACE, EXTRACT_QUOTES);
        if (r < 0)
                return log_error_errno(r, "Failed to split getter option: %m");

        r = strv_extend(&words, url);
        if (r < 0)
                return log_error_errno(r, "Failed to create command line: %m");

        r = spawn_child(words[0], words);
        if (r < 0)
                log_error_errno(errno, "Failed to spawn getter %s: %m", getter);

        return r;
}

#define filename_escape(s) xescape((s), "/ ")

static int open_output(Writer *w, const char* host) {
        _cleanup_free_ char *_output = NULL;
        const char *output;
        int r;

        switch (arg_split_mode) {
        case JOURNAL_WRITE_SPLIT_NONE:
                output = arg_output ?: REMOTE_JOURNAL_PATH "/remote.journal";
                break;

        case JOURNAL_WRITE_SPLIT_HOST: {
                _cleanup_free_ char *name;

                assert(host);

                name = filename_escape(host);
                if (!name)
                        return log_oom();

                r = asprintf(&_output, "%s/remote-%s.journal",
                             arg_output ?: REMOTE_JOURNAL_PATH,
                             name);
                if (r < 0)
                        return log_oom();

                output = _output;
                break;
        }

        default:
                assert_not_reached("what?");
        }

        r = journal_file_open_reliably(output,
                                       O_RDWR|O_CREAT, 0640,
                                       arg_compress, arg_seal,
                                       &w->metrics,
                                       w->mmap,
                                       NULL, &w->journal);
        if (r < 0)
                log_error_errno(r, "Failed to open output journal %s: %m",
                                output);
        else
                log_debug("Opened output file %s", w->journal->path);
        return r;
}

/**********************************************************************
 **********************************************************************
 **********************************************************************/

static int init_writer_hashmap(RemoteServer *s) {
        static const struct hash_ops *hash_ops[] = {
                [JOURNAL_WRITE_SPLIT_NONE] = NULL,
                [JOURNAL_WRITE_SPLIT_HOST] = &string_hash_ops,
        };

        assert(arg_split_mode >= 0 && arg_split_mode < (int) ELEMENTSOF(hash_ops));

        s->writers = hashmap_new(hash_ops[arg_split_mode]);
        if (!s->writers)
                return log_oom();

        return 0;
}

static int get_writer(RemoteServer *s, const char *host,
                      Writer **writer) {
        const void *key;
        _cleanup_writer_unref_ Writer *w = NULL;
        int r;

        switch(arg_split_mode) {
        case JOURNAL_WRITE_SPLIT_NONE:
                key = "one and only";
                break;

        case JOURNAL_WRITE_SPLIT_HOST:
                assert(host);
                key = host;
                break;

        default:
                assert_not_reached("what split mode?");
        }

        w = hashmap_get(s->writers, key);
        if (w)
                writer_ref(w);
        else {
                w = writer_new(s);
                if (!w)
                        return log_oom();

                if (arg_split_mode == JOURNAL_WRITE_SPLIT_HOST) {
                        w->hashmap_key = strdup(key);
                        if (!w->hashmap_key)
                                return log_oom();
                }

                r = open_output(w, host);
                if (r < 0)
                        return r;

                r = hashmap_put(s->writers, w->hashmap_key ?: key, w);
                if (r < 0)
                        return r;
        }

        *writer = w;
        w = NULL;
        return 0;
}

/**********************************************************************
 **********************************************************************
 **********************************************************************/

/* This should go away as soon as µhttpd allows state to be passed around. */
static RemoteServer *server;

static int dispatch_raw_source_event(sd_event_source *event,
                                     int fd,
                                     uint32_t revents,
                                     void *userdata);
static int dispatch_raw_source_until_block(sd_event_source *event,
                                           void *userdata);
static int dispatch_blocking_source_event(sd_event_source *event,
                                          void *userdata);
static int dispatch_raw_connection_event(sd_event_source *event,
                                         int fd,
                                         uint32_t revents,
                                         void *userdata);
static int dispatch_http_event(sd_event_source *event,
                               int fd,
                               uint32_t revents,
                               void *userdata);

static int get_source_for_fd(RemoteServer *s,
                             int fd, char *name, RemoteSource **source) {
        Writer *writer;
        int r;

        /* This takes ownership of name, but only on success. */

        assert(fd >= 0);
        assert(source);

        if (!GREEDY_REALLOC0(s->sources, s->sources_size, fd + 1))
                return log_oom();

        r = get_writer(s, name, &writer);
        if (r < 0)
                return log_warning_errno(r, "Failed to get writer for source %s: %m",
                                         name);

        if (s->sources[fd] == NULL) {
                s->sources[fd] = source_new(fd, false, name, writer);
                if (!s->sources[fd]) {
                        writer_unref(writer);
                        return log_oom();
                }

                s->active++;
        }

        *source = s->sources[fd];
        return 0;
}

static int remove_source(RemoteServer *s, int fd) {
        RemoteSource *source;

        assert(s);
        assert(fd >= 0 && fd < (ssize_t) s->sources_size);

        source = s->sources[fd];
        if (source) {
                /* this closes fd too */
                source_free(source);
                s->sources[fd] = NULL;
                s->active--;
        }

        return 0;
}

static int add_source(RemoteServer *s, int fd, char* name, bool own_name) {

        RemoteSource *source = NULL;
        int r;

        /* This takes ownership of name, even on failure, if own_name is true. */

        assert(s);
        assert(fd >= 0);
        assert(name);

        if (!own_name) {
                name = strdup(name);
                if (!name)
                        return log_oom();
        }

        r = get_source_for_fd(s, fd, name, &source);
        if (r < 0) {
                log_error_errno(r, "Failed to create source for fd:%d (%s): %m",
                                fd, name);
                free(name);
                return r;
        }

        r = sd_event_add_io(s->events, &source->event,
                            fd, EPOLLIN|EPOLLRDHUP|EPOLLPRI,
                            dispatch_raw_source_event, source);
        if (r == 0) {
                /* Add additional source for buffer processing. It will be
                 * enabled later. */
                r = sd_event_add_defer(s->events, &source->buffer_event,
                                       dispatch_raw_source_until_block, source);
                if (r == 0)
                        sd_event_source_set_enabled(source->buffer_event, SD_EVENT_OFF);
        } else if (r == -EPERM) {
                log_debug("Falling back to sd_event_add_defer for fd:%d (%s)", fd, name);
                r = sd_event_add_defer(s->events, &source->event,
                                       dispatch_blocking_source_event, source);
                if (r == 0)
                        sd_event_source_set_enabled(source->event, SD_EVENT_ON);
        }
        if (r < 0) {
                log_error_errno(r, "Failed to register event source for fd:%d: %m",
                                fd);
                goto error;
        }

        r = sd_event_source_set_description(source->event, name);
        if (r < 0) {
                log_error_errno(r, "Failed to set source name for fd:%d: %m", fd);
                goto error;
        }

        return 1; /* work to do */

 error:
        remove_source(s, fd);
        return r;
}

static int add_raw_socket(RemoteServer *s, int fd) {
        int r;
        _cleanup_close_ int fd_ = fd;
        char name[sizeof("raw-socket-")-1 + DECIMAL_STR_MAX(int) + 1];

        assert(fd >= 0);

        r = sd_event_add_io(s->events, &s->listen_event,
                            fd, EPOLLIN,
                            dispatch_raw_connection_event, s);
        if (r < 0)
                return r;

        xsprintf(name, "raw-socket-%d", fd);

        r = sd_event_source_set_description(s->listen_event, name);
        if (r < 0)
                return r;

        fd_ = -1;
        s->active ++;
        return 0;
}

static int setup_raw_socket(RemoteServer *s, const char *address) {
        int fd;

        fd = make_socket_fd(LOG_INFO, address, SOCK_STREAM | SOCK_CLOEXEC);
        if (fd < 0)
                return fd;

        return add_raw_socket(s, fd);
}

/**********************************************************************
 **********************************************************************
 **********************************************************************/

static int request_meta(void **connection_cls, int fd, char *hostname) {
        RemoteSource *source;
        Writer *writer;
        int r;

        assert(connection_cls);
        if (*connection_cls)
                return 0;

        r = get_writer(server, hostname, &writer);
        if (r < 0)
                return log_warning_errno(r, "Failed to get writer for source %s: %m",
                                         hostname);

        source = source_new(fd, true, hostname, writer);
        if (!source) {
                writer_unref(writer);
                return log_oom();
        }

        log_debug("Added RemoteSource as connection metadata %p", source);

        *connection_cls = source;
        return 0;
}

static void request_meta_free(void *cls,
                              struct MHD_Connection *connection,
                              void **connection_cls,
                              enum MHD_RequestTerminationCode toe) {
        RemoteSource *s;

        assert(connection_cls);
        s = *connection_cls;

        if (s) {
                log_debug("Cleaning up connection metadata %p", s);
                source_free(s);
                *connection_cls = NULL;
        }
}

static int process_http_upload(
                struct MHD_Connection *connection,
                const char *upload_data,
                size_t *upload_data_size,
                RemoteSource *source) {

        bool finished = false;
        size_t remaining;
        int r;

        assert(source);

        log_trace("%s: connection %p, %zu bytes",
                  __func__, connection, *upload_data_size);

        if (*upload_data_size) {
                log_trace("Received %zu bytes", *upload_data_size);

                r = push_data(source, upload_data, *upload_data_size);
                if (r < 0)
                        return mhd_respond_oom(connection);

                *upload_data_size = 0;
        } else
                finished = true;

        for (;;) {
                r = process_source(source, arg_compress, arg_seal);
                if (r == -EAGAIN)
                        break;
                else if (r < 0) {
                        log_warning("Failed to process data for connection %p", connection);
                        if (r == -E2BIG)
                                return mhd_respondf(connection,
                                                    MHD_HTTP_REQUEST_ENTITY_TOO_LARGE,
                                                    "Entry is too large, maximum is %u bytes.\n",
                                                    DATA_SIZE_MAX);
                        else
                                return mhd_respondf(connection,
                                                    MHD_HTTP_UNPROCESSABLE_ENTITY,
                                                    "Processing failed: %s.", strerror(-r));
                }
        }

        if (!finished)
                return MHD_YES;

        /* The upload is finished */

        remaining = source_non_empty(source);
        if (remaining > 0) {
                log_warning("Premature EOFbyte. %zu bytes lost.", remaining);
                return mhd_respondf(connection, MHD_HTTP_EXPECTATION_FAILED,
                                    "Premature EOF. %zu bytes of trailing data not processed.",
                                    remaining);
        }

        return mhd_respond(connection, MHD_HTTP_ACCEPTED, "OK.\n");
};

static int request_handler(
                void *cls,
                struct MHD_Connection *connection,
                const char *url,
                const char *method,
                const char *version,
                const char *upload_data,
                size_t *upload_data_size,
                void **connection_cls) {

        const char *header;
        int r, code, fd;
        _cleanup_free_ char *hostname = NULL;

        assert(connection);
        assert(connection_cls);
        assert(url);
        assert(method);

        log_trace("Handling a connection %s %s %s", method, url, version);

        if (*connection_cls)
                return process_http_upload(connection,
                                           upload_data, upload_data_size,
                                           *connection_cls);

        if (!streq(method, "POST"))
                return mhd_respond(connection, MHD_HTTP_METHOD_NOT_ACCEPTABLE,
                                   "Unsupported method.\n");

        if (!streq(url, "/upload"))
                return mhd_respond(connection, MHD_HTTP_NOT_FOUND,
                                   "Not found.\n");

        header = MHD_lookup_connection_value(connection,
                                             MHD_HEADER_KIND, "Content-Type");
        if (!header || !streq(header, "application/vnd.fdo.journal"))
                return mhd_respond(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
                                   "Content-Type: application/vnd.fdo.journal"
                                   " is required.\n");

        {
                const union MHD_ConnectionInfo *ci;

                ci = MHD_get_connection_info(connection,
                                             MHD_CONNECTION_INFO_CONNECTION_FD);
                if (!ci) {
                        log_error("MHD_get_connection_info failed: cannot get remote fd");
                        return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
                                           "Cannot check remote address");
                }

                fd = ci->connect_fd;
                assert(fd >= 0);
        }

        if (server->check_trust) {
                r = check_permissions(connection, &code, &hostname);
                if (r < 0)
                        return code;
        } else {
                r = getnameinfo_pretty(fd, &hostname);
                if (r < 0)
                        return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
                                           "Cannot check remote hostname");
        }

        assert(hostname);

        r = request_meta(connection_cls, fd, hostname);
        if (r == -ENOMEM)
                return respond_oom(connection);
        else if (r < 0)
                return mhd_respond(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
                                   strerror(-r));

        hostname = NULL;
        return MHD_YES;
}

static int setup_microhttpd_server(RemoteServer *s,
                                   int fd,
                                   const char *key,
                                   const char *cert,
                                   const char *trust) {
        struct MHD_OptionItem opts[] = {
                { MHD_OPTION_NOTIFY_COMPLETED, (intptr_t) request_meta_free},
                { MHD_OPTION_EXTERNAL_LOGGER, (intptr_t) microhttpd_logger},
                { MHD_OPTION_LISTEN_SOCKET, fd},
                { MHD_OPTION_CONNECTION_MEMORY_LIMIT, DATA_SIZE_MAX},
                { MHD_OPTION_END},
                { MHD_OPTION_END},
                { MHD_OPTION_END},
                { MHD_OPTION_END}};
        int opts_pos = 4;
        int flags =
                MHD_USE_DEBUG |
                MHD_USE_DUAL_STACK |
                MHD_USE_EPOLL_LINUX_ONLY |
                MHD_USE_PEDANTIC_CHECKS |
                MHD_USE_PIPE_FOR_SHUTDOWN;

        const union MHD_DaemonInfo *info;
        int r, epoll_fd;
        MHDDaemonWrapper *d;

        assert(fd >= 0);

        r = fd_nonblock(fd, true);
        if (r < 0)
                return log_error_errno(r, "Failed to make fd:%d nonblocking: %m", fd);

        if (key) {
                assert(cert);

                opts[opts_pos++] = (struct MHD_OptionItem)
                        {MHD_OPTION_HTTPS_MEM_KEY, 0, (char*) key};
                opts[opts_pos++] = (struct MHD_OptionItem)
                        {MHD_OPTION_HTTPS_MEM_CERT, 0, (char*) cert};

                flags |= MHD_USE_SSL;

                if (trust)
                        opts[opts_pos++] = (struct MHD_OptionItem)
                                {MHD_OPTION_HTTPS_MEM_TRUST, 0, (char*) trust};
        }

        d = new(MHDDaemonWrapper, 1);
        if (!d)
                return log_oom();

        d->fd = (uint64_t) fd;

        d->daemon = MHD_start_daemon(flags, 0,
                                     NULL, NULL,
                                     request_handler, NULL,
                                     MHD_OPTION_ARRAY, opts,
                                     MHD_OPTION_END);
        if (!d->daemon) {
                log_error("Failed to start µhttp daemon");
                r = -EINVAL;
                goto error;
        }

        log_debug("Started MHD %s daemon on fd:%d (wrapper @ %p)",
                  key ? "HTTPS" : "HTTP", fd, d);


        info = MHD_get_daemon_info(d->daemon, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
        if (!info) {
                log_error("µhttp returned NULL daemon info");
                r = -EOPNOTSUPP;
                goto error;
        }

        epoll_fd = info->listen_fd;
        if (epoll_fd < 0) {
                log_error("µhttp epoll fd is invalid");
                r = -EUCLEAN;
                goto error;
        }

        r = sd_event_add_io(s->events, &d->event,
                            epoll_fd, EPOLLIN,
                            dispatch_http_event, d);
        if (r < 0) {
                log_error_errno(r, "Failed to add event callback: %m");
                goto error;
        }

        r = sd_event_source_set_description(d->event, "epoll-fd");
        if (r < 0) {
                log_error_errno(r, "Failed to set source name: %m");
                goto error;
        }

        r = hashmap_ensure_allocated(&s->daemons, &uint64_hash_ops);
        if (r < 0) {
                log_oom();
                goto error;
        }

        r = hashmap_put(s->daemons, &d->fd, d);
        if (r < 0) {
                log_error_errno(r, "Failed to add daemon to hashmap: %m");
                goto error;
        }

        s->active ++;
        return 0;

error:
        MHD_stop_daemon(d->daemon);
        free(d->daemon);
        free(d);
        return r;
}

static int setup_microhttpd_socket(RemoteServer *s,
                                   const char *address,
                                   const char *key,
                                   const char *cert,
                                   const char *trust) {
        int fd;

        fd = make_socket_fd(LOG_DEBUG, address, SOCK_STREAM | SOCK_CLOEXEC);
        if (fd < 0)
                return fd;

        return setup_microhttpd_server(s, fd, key, cert, trust);
}

static int dispatch_http_event(sd_event_source *event,
                               int fd,
                               uint32_t revents,
                               void *userdata) {
        MHDDaemonWrapper *d = userdata;
        int r;

        assert(d);

        r = MHD_run(d->daemon);
        if (r == MHD_NO) {
                log_error("MHD_run failed!");
                // XXX: unregister daemon
                return -EINVAL;
        }

        return 1; /* work to do */
}

/**********************************************************************
 **********************************************************************
 **********************************************************************/

static int setup_signals(RemoteServer *s) {
        int r;

        assert(s);

        assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGINT, SIGTERM, -1) >= 0);

        r = sd_event_add_signal(s->events, &s->sigterm_event, SIGTERM, NULL, s);
        if (r < 0)
                return r;

        r = sd_event_add_signal(s->events, &s->sigint_event, SIGINT, NULL, s);
        if (r < 0)
                return r;

        return 0;
}

static int negative_fd(const char *spec) {
        /* Return a non-positive number as its inverse, -EINVAL otherwise. */

        int fd, r;

        r = safe_atoi(spec, &fd);
        if (r < 0)
                return r;

        if (fd > 0)
                return -EINVAL;
        else
                return -fd;
}

static int remoteserver_init(RemoteServer *s,
                             const char* key,
                             const char* cert,
                             const char* trust) {
        int r, n, fd;
        char **file;

        assert(s);

        if ((arg_listen_raw || arg_listen_http) && trust) {
                log_error("Option --trust makes all non-HTTPS connections untrusted.");
                return -EINVAL;
        }

        r = sd_event_default(&s->events);
        if (r < 0)
                return log_error_errno(r, "Failed to allocate event loop: %m");

        setup_signals(s);

        assert(server == NULL);
        server = s;

        r = init_writer_hashmap(s);
        if (r < 0)
                return r;

        n = sd_listen_fds(true);
        if (n < 0)
                return log_error_errno(n, "Failed to read listening file descriptors from environment: %m");
        else
                log_debug("Received %d descriptors", n);

        if (MAX(http_socket, https_socket) >= SD_LISTEN_FDS_START + n) {
                log_error("Received fewer sockets than expected");
                return -EBADFD;
        }

        for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
                if (sd_is_socket(fd, AF_UNSPEC, 0, true)) {
                        log_debug("Received a listening socket (fd:%d)", fd);

                        if (fd == http_socket)
                                r = setup_microhttpd_server(s, fd, NULL, NULL, NULL);
                        else if (fd == https_socket)
                                r = setup_microhttpd_server(s, fd, key, cert, trust);
                        else
                                r = add_raw_socket(s, fd);
                } else if (sd_is_socket(fd, AF_UNSPEC, 0, false)) {
                        char *hostname;

                        r = getnameinfo_pretty(fd, &hostname);
                        if (r < 0)
                                return log_error_errno(r, "Failed to retrieve remote name: %m");

                        log_debug("Received a connection socket (fd:%d) from %s", fd, hostname);

                        r = add_source(s, fd, hostname, true);
                } else {
                        log_error("Unknown socket passed on fd:%d", fd);

                        return -EINVAL;
                }

                if (r < 0)
                        return log_error_errno(r, "Failed to register socket (fd:%d): %m",
                                               fd);
        }

        if (arg_url) {
                const char *url, *hostname;

                url = strjoina(arg_url, "/entries");

                if (arg_getter) {
                        log_info("Spawning getter %s...", url);
                        fd = spawn_getter(arg_getter, url);
                } else {
                        log_info("Spawning curl %s...", url);
                        fd = spawn_curl(url);
                }
                if (fd < 0)
                        return fd;

                hostname =
                        startswith(arg_url, "https://") ?:
                        startswith(arg_url, "http://") ?:
                        arg_url;

                r = add_source(s, fd, (char*) hostname, false);
                if (r < 0)
                        return r;
        }

        if (arg_listen_raw) {
                log_debug("Listening on a socket...");
                r = setup_raw_socket(s, arg_listen_raw);
                if (r < 0)
                        return r;
        }

        if (arg_listen_http) {
                r = setup_microhttpd_socket(s, arg_listen_http, NULL, NULL, NULL);
                if (r < 0)
                        return r;
        }

        if (arg_listen_https) {
                r = setup_microhttpd_socket(s, arg_listen_https, key, cert, trust);
                if (r < 0)
                        return r;
        }

        STRV_FOREACH(file, arg_files) {
                const char *output_name;

                if (streq(*file, "-")) {
                        log_debug("Using standard input as source.");

                        fd = STDIN_FILENO;
                        output_name = "stdin";
                } else {
                        log_debug("Reading file %s...", *file);

                        fd = open(*file, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
                        if (fd < 0)
                                return log_error_errno(errno, "Failed to open %s: %m", *file);
                        output_name = *file;
                }

                r = add_source(s, fd, (char*) output_name, false);
                if (r < 0)
                        return r;
        }

        if (s->active == 0) {
                log_error("Zero sources specified");
                return -EINVAL;
        }

        if (arg_split_mode == JOURNAL_WRITE_SPLIT_NONE) {
                /* In this case we know what the writer will be
                   called, so we can create it and verify that we can
                   create output as expected. */
                r = get_writer(s, NULL, &s->_single_writer);
                if (r < 0)
                        return r;
        }

        return 0;
}

static void server_destroy(RemoteServer *s) {
        size_t i;
        MHDDaemonWrapper *d;

        while ((d = hashmap_steal_first(s->daemons))) {
                MHD_stop_daemon(d->daemon);
                sd_event_source_unref(d->event);
                free(d);
        }

        hashmap_free(s->daemons);

        assert(s->sources_size == 0 || s->sources);
        for (i = 0; i < s->sources_size; i++)
                remove_source(s, i);
        free(s->sources);

        writer_unref(s->_single_writer);
        hashmap_free(s->writers);

        sd_event_source_unref(s->sigterm_event);
        sd_event_source_unref(s->sigint_event);
        sd_event_source_unref(s->listen_event);
        sd_event_unref(s->events);

        /* fds that we're listening on remain open... */
}

/**********************************************************************
 **********************************************************************
 **********************************************************************/

static int handle_raw_source(sd_event_source *event,
                             int fd,
                             uint32_t revents,
                             RemoteServer *s) {

        RemoteSource *source;
        int r;

        /* Returns 1 if there might be more data pending,
         * 0 if data is currently exhausted, negative on error.
         */

        assert(fd >= 0 && fd < (ssize_t) s->sources_size);
        source = s->sources[fd];
        assert(source->fd == fd);

        r = process_source(source, arg_compress, arg_seal);
        if (source->state == STATE_EOF) {
                size_t remaining;

                log_debug("EOF reached with source fd:%d (%s)",
                          source->fd, source->name);

                remaining = source_non_empty(source);
                if (remaining > 0)
                        log_notice("Premature EOF. %zu bytes lost.", remaining);
                remove_source(s, source->fd);
                log_debug("%zu active sources remaining", s->active);
                return 0;
        } else if (r == -E2BIG) {
                log_notice_errno(E2BIG, "Entry too big, skipped");
                return 1;
        } else if (r == -EAGAIN) {
                return 0;
        } else if (r < 0) {
                log_debug_errno(r, "Closing connection: %m");
                remove_source(server, fd);
                return 0;
        } else
                return 1;
}

static int dispatch_raw_source_until_block(sd_event_source *event,
                                           void *userdata) {
        RemoteSource *source = userdata;
        int r;

        /* Make sure event stays around even if source is destroyed */
        sd_event_source_ref(event);

        r = handle_raw_source(event, source->fd, EPOLLIN, server);
        if (r != 1)
                /* No more data for now */
                sd_event_source_set_enabled(event, SD_EVENT_OFF);

        sd_event_source_unref(event);

        return r;
}

static int dispatch_raw_source_event(sd_event_source *event,
                                     int fd,
                                     uint32_t revents,
                                     void *userdata) {
        RemoteSource *source = userdata;
        int r;

        assert(source->event);
        assert(source->buffer_event);

        r = handle_raw_source(event, fd, EPOLLIN, server);
        if (r == 1)
                /* Might have more data. We need to rerun the handler
                 * until we are sure the buffer is exhausted. */
                sd_event_source_set_enabled(source->buffer_event, SD_EVENT_ON);

        return r;
}

static int dispatch_blocking_source_event(sd_event_source *event,
                                          void *userdata) {
        RemoteSource *source = userdata;

        return handle_raw_source(event, source->fd, EPOLLIN, server);
}

static int accept_connection(const char* type, int fd,
                             SocketAddress *addr, char **hostname) {
        int fd2, r;

        log_debug("Accepting new %s connection on fd:%d", type, fd);
        fd2 = accept4(fd, &addr->sockaddr.sa, &addr->size, SOCK_NONBLOCK|SOCK_CLOEXEC);
        if (fd2 < 0)
                return log_error_errno(errno, "accept() on fd:%d failed: %m", fd);

        switch(socket_address_family(addr)) {
        case AF_INET:
        case AF_INET6: {
                _cleanup_free_ char *a = NULL;
                char *b;

                r = socket_address_print(addr, &a);
                if (r < 0) {
                        log_error_errno(r, "socket_address_print(): %m");
                        close(fd2);
                        return r;
                }

                r = socknameinfo_pretty(&addr->sockaddr, addr->size, &b);
                if (r < 0) {
                        log_error_errno(r, "Resolving hostname failed: %m");
                        close(fd2);
                        return r;
                }

                log_debug("Accepted %s %s connection from %s",
                          type,
                          socket_address_family(addr) == AF_INET ? "IP" : "IPv6",
                          a);

                *hostname = b;

                return fd2;
        };
        default:
                log_error("Rejected %s connection with unsupported family %d",
                          type, socket_address_family(addr));
                close(fd2);

                return -EINVAL;
        }
}

static int dispatch_raw_connection_event(sd_event_source *event,
                                         int fd,
                                         uint32_t revents,
                                         void *userdata) {
        RemoteServer *s = userdata;
        int fd2;
        SocketAddress addr = {
                .size = sizeof(union sockaddr_union),
                .type = SOCK_STREAM,
        };
        char *hostname = NULL;

        fd2 = accept_connection("raw", fd, &addr, &hostname);
        if (fd2 < 0)
                return fd2;

        return add_source(s, fd2, hostname, true);
}

/**********************************************************************
 **********************************************************************
 **********************************************************************/

static const char* const journal_write_split_mode_table[_JOURNAL_WRITE_SPLIT_MAX] = {
        [JOURNAL_WRITE_SPLIT_NONE] = "none",
        [JOURNAL_WRITE_SPLIT_HOST] = "host",
};

DEFINE_PRIVATE_STRING_TABLE_LOOKUP(journal_write_split_mode, JournalWriteSplitMode);
static DEFINE_CONFIG_PARSE_ENUM(config_parse_write_split_mode,
                                journal_write_split_mode,
                                JournalWriteSplitMode,
                                "Failed to parse split mode setting");

static int parse_config(void) {
        const ConfigTableItem items[] = {
                { "Remote",  "SplitMode",              config_parse_write_split_mode, 0, &arg_split_mode },
                { "Remote",  "ServerKeyFile",          config_parse_path,             0, &arg_key        },
                { "Remote",  "ServerCertificateFile",  config_parse_path,             0, &arg_cert       },
                { "Remote",  "TrustedCertificateFile", config_parse_path,             0, &arg_trust      },
                {}};

        return config_parse_many(PKGSYSCONFDIR "/journal-remote.conf",
                                 CONF_DIRS_NULSTR("systemd/journal-remote.conf"),
                                 "Remote\0", config_item_table_lookup, items,
                                 false, NULL);
}

static void help(void) {
        printf("%s [OPTIONS...] {FILE|-}...\n\n"
               "Write external journal events to journal file(s).\n\n"
               "  -h --help                 Show this help\n"
               "     --version              Show package version\n"
               "     --url=URL              Read events from systemd-journal-gatewayd at URL\n"
               "     --getter=COMMAND       Read events from the output of COMMAND\n"
               "     --listen-raw=ADDR      Listen for connections at ADDR\n"
               "     --listen-http=ADDR     Listen for HTTP connections at ADDR\n"
               "     --listen-https=ADDR    Listen for HTTPS connections at ADDR\n"
               "  -o --output=FILE|DIR      Write output to FILE or DIR/external-*.journal\n"
               "     --compress[=BOOL]      XZ-compress the output journal (default: yes)\n"
               "     --seal[=BOOL]          Use event sealing (default: no)\n"
               "     --key=FILENAME         SSL key in PEM format (default:\n"
               "                            \"" PRIV_KEY_FILE "\")\n"
               "     --cert=FILENAME        SSL certificate in PEM format (default:\n"
               "                            \"" CERT_FILE "\")\n"
               "     --trust=FILENAME|all   SSL CA certificate or disable checking (default:\n"
               "                            \"" TRUST_FILE "\")\n"
               "     --gnutls-log=CATEGORY...\n"
               "                            Specify a list of gnutls logging categories\n"
               "     --split-mode=none|host How many output files to create\n"
               "\n"
               "Note: file descriptors from sd_listen_fds() will be consumed, too.\n"
               , program_invocation_short_name);
}

static int parse_argv(int argc, char *argv[]) {
        enum {
                ARG_VERSION = 0x100,
                ARG_URL,
                ARG_LISTEN_RAW,
                ARG_LISTEN_HTTP,
                ARG_LISTEN_HTTPS,
                ARG_GETTER,
                ARG_SPLIT_MODE,
                ARG_COMPRESS,
                ARG_SEAL,
                ARG_KEY,
                ARG_CERT,
                ARG_TRUST,
                ARG_GNUTLS_LOG,
        };

        static const struct option options[] = {
                { "help",         no_argument,       NULL, 'h'              },
                { "version",      no_argument,       NULL, ARG_VERSION      },
                { "url",          required_argument, NULL, ARG_URL          },
                { "getter",       required_argument, NULL, ARG_GETTER       },
                { "listen-raw",   required_argument, NULL, ARG_LISTEN_RAW   },
                { "listen-http",  required_argument, NULL, ARG_LISTEN_HTTP  },
                { "listen-https", required_argument, NULL, ARG_LISTEN_HTTPS },
                { "output",       required_argument, NULL, 'o'              },
                { "split-mode",   required_argument, NULL, ARG_SPLIT_MODE   },
                { "compress",     optional_argument, NULL, ARG_COMPRESS     },
                { "seal",         optional_argument, NULL, ARG_SEAL         },
                { "key",          required_argument, NULL, ARG_KEY          },
                { "cert",         required_argument, NULL, ARG_CERT         },
                { "trust",        required_argument, NULL, ARG_TRUST        },
                { "gnutls-log",   required_argument, NULL, ARG_GNUTLS_LOG   },
                {}
        };

        int c, r;
        const char *p;
        bool type_a, type_b;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "ho:", options, NULL)) >= 0)
                switch(c) {
                case 'h':
                        help();
                        return 0 /* done */;

                case ARG_VERSION:
                        return version();

                case ARG_URL:
                        if (arg_url) {
                                log_error("cannot currently set more than one --url");
                                return -EINVAL;
                        }

                        arg_url = optarg;
                        break;

                case ARG_GETTER:
                        if (arg_getter) {
                                log_error("cannot currently use --getter more than once");
                                return -EINVAL;
                        }

                        arg_getter = optarg;
                        break;

                case ARG_LISTEN_RAW:
                        if (arg_listen_raw) {
                                log_error("cannot currently use --listen-raw more than once");
                                return -EINVAL;
                        }

                        arg_listen_raw = optarg;
                        break;

                case ARG_LISTEN_HTTP:
                        if (arg_listen_http || http_socket >= 0) {
                                log_error("cannot currently use --listen-http more than once");
                                return -EINVAL;
                        }

                        r = negative_fd(optarg);
                        if (r >= 0)
                                http_socket = r;
                        else
                                arg_listen_http = optarg;
                        break;

                case ARG_LISTEN_HTTPS:
                        if (arg_listen_https || https_socket >= 0) {
                                log_error("cannot currently use --listen-https more than once");
                                return -EINVAL;
                        }

                        r = negative_fd(optarg);
                        if (r >= 0)
                                https_socket = r;
                        else
                                arg_listen_https = optarg;

                        break;

                case ARG_KEY:
                        if (arg_key) {
                                log_error("Key file specified twice");
                                return -EINVAL;
                        }

                        arg_key = strdup(optarg);
                        if (!arg_key)
                                return log_oom();

                        break;

                case ARG_CERT:
                        if (arg_cert) {
                                log_error("Certificate file specified twice");
                                return -EINVAL;
                        }

                        arg_cert = strdup(optarg);
                        if (!arg_cert)
                                return log_oom();

                        break;

                case ARG_TRUST:
                        if (arg_trust || arg_trust_all) {
                                log_error("Confusing trusted CA configuration");
                                return -EINVAL;
                        }

                        if (streq(optarg, "all"))
                                arg_trust_all = true;
                        else {
#ifdef HAVE_GNUTLS
                                arg_trust = strdup(optarg);
                                if (!arg_trust)
                                        return log_oom();
#else
                                log_error("Option --trust is not available.");
                                return -EINVAL;
#endif
                        }

                        break;

                case 'o':
                        if (arg_output) {
                                log_error("cannot use --output/-o more than once");
                                return -EINVAL;
                        }

                        arg_output = optarg;
                        break;

                case ARG_SPLIT_MODE:
                        arg_split_mode = journal_write_split_mode_from_string(optarg);
                        if (arg_split_mode == _JOURNAL_WRITE_SPLIT_INVALID) {
                                log_error("Invalid split mode: %s", optarg);
                                return -EINVAL;
                        }
                        break;

                case ARG_COMPRESS:
                        if (optarg) {
                                r = parse_boolean(optarg);
                                if (r < 0) {
                                        log_error("Failed to parse --compress= parameter.");
                                        return -EINVAL;
                                }

                                arg_compress = !!r;
                        } else
                                arg_compress = true;

                        break;

                case ARG_SEAL:
                        if (optarg) {
                                r = parse_boolean(optarg);
                                if (r < 0) {
                                        log_error("Failed to parse --seal= parameter.");
                                        return -EINVAL;
                                }

                                arg_seal = !!r;
                        } else
                                arg_seal = true;

                        break;

                case ARG_GNUTLS_LOG: {
#ifdef HAVE_GNUTLS
                        p = optarg;
                        for (;;) {
                                _cleanup_free_ char *word = NULL;

                                r = extract_first_word(&p, &word, ",", 0);
                                if (r < 0)
                                        return log_error_errno(r, "Failed to parse --gnutls-log= argument: %m");

                                if (r == 0)
                                        break;

                                if (strv_push(&arg_gnutls_log, word) < 0)
                                        return log_oom();

                                word = NULL;
                        }
                        break;
#else
                        log_error("Option --gnutls-log is not available.");
                        return -EINVAL;
#endif
                }

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached("Unknown option code.");
                }

        if (optind < argc)
                arg_files = argv + optind;

        type_a = arg_getter || !strv_isempty(arg_files);
        type_b = arg_url
                || arg_listen_raw
                || arg_listen_http || arg_listen_https
                || sd_listen_fds(false) > 0;
        if (type_a && type_b) {
                log_error("Cannot use file input or --getter with "
                          "--arg-listen-... or socket activation.");
                return -EINVAL;
        }
        if (type_a) {
                if (!arg_output) {
                        log_error("Option --output must be specified with file input or --getter.");
                        return -EINVAL;
                }

                arg_split_mode = JOURNAL_WRITE_SPLIT_NONE;
        }

        if (arg_split_mode == JOURNAL_WRITE_SPLIT_NONE
            && arg_output && is_dir(arg_output, true) > 0) {
                log_error("For SplitMode=none, output must be a file.");
                return -EINVAL;
        }

        if (arg_split_mode == JOURNAL_WRITE_SPLIT_HOST
            && arg_output && is_dir(arg_output, true) <= 0) {
                log_error("For SplitMode=host, output must be a directory.");
                return -EINVAL;
        }

        log_debug("Full config: SplitMode=%s Key=%s Cert=%s Trust=%s",
                  journal_write_split_mode_to_string(arg_split_mode),
                  strna(arg_key),
                  strna(arg_cert),
                  strna(arg_trust));

        return 1 /* work to do */;
}

static int load_certificates(char **key, char **cert, char **trust) {
        int r;

        r = read_full_file(arg_key ?: PRIV_KEY_FILE, key, NULL);
        if (r < 0)
                return log_error_errno(r, "Failed to read key from file '%s': %m",
                                       arg_key ?: PRIV_KEY_FILE);

        r = read_full_file(arg_cert ?: CERT_FILE, cert, NULL);
        if (r < 0)
                return log_error_errno(r, "Failed to read certificate from file '%s': %m",
                                       arg_cert ?: CERT_FILE);

        if (arg_trust_all)
                log_info("Certificate checking disabled.");
        else {
                r = read_full_file(arg_trust ?: TRUST_FILE, trust, NULL);
                if (r < 0)
                        return log_error_errno(r, "Failed to read CA certificate file '%s': %m",
                                               arg_trust ?: TRUST_FILE);
        }

        return 0;
}

int main(int argc, char **argv) {
        RemoteServer s = {};
        int r;
        _cleanup_free_ char *key = NULL, *cert = NULL, *trust = NULL;

        log_show_color(true);
        log_parse_environment();

        r = parse_config();
        if (r < 0)
                return EXIT_FAILURE;

        r = parse_argv(argc, argv);
        if (r <= 0)
                return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;


        if (arg_listen_http || arg_listen_https) {
                r = setup_gnutls_logger(arg_gnutls_log);
                if (r < 0)
                        return EXIT_FAILURE;
        }

        if (arg_listen_https || https_socket >= 0)
                if (load_certificates(&key, &cert, &trust) < 0)
                        return EXIT_FAILURE;

        if (remoteserver_init(&s, key, cert, trust) < 0)
                return EXIT_FAILURE;

        r = sd_event_set_watchdog(s.events, true);
        if (r < 0)
                log_error_errno(r, "Failed to enable watchdog: %m");
        else
                log_debug("Watchdog is %s.", r > 0 ? "enabled" : "disabled");

        log_debug("%s running as pid "PID_FMT,
                  program_invocation_short_name, getpid());
        sd_notify(false,
                  "READY=1\n"
                  "STATUS=Processing requests...");

        while (s.active) {
                r = sd_event_get_state(s.events);
                if (r < 0)
                        break;
                if (r == SD_EVENT_FINISHED)
                        break;

                r = sd_event_run(s.events, -1);
                if (r < 0) {
                        log_error_errno(r, "Failed to run event loop: %m");
                        break;
                }
        }

        sd_notifyf(false,
                   "STOPPING=1\n"
                   "STATUS=Shutting down after writing %" PRIu64 " entries...", s.event_count);
        log_info("Finishing after writing %" PRIu64 " entries", s.event_count);

        server_destroy(&s);

        free(arg_key);
        free(arg_cert);
        free(arg_trust);

        return r >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}