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
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MOD_PROXY_H
#define MOD_PROXY_H
/**
* @file mod_proxy.h
* @brief Proxy Extension Module for Apache
*
* @defgroup MOD_PROXY mod_proxy
* @ingroup APACHE_MODS
* @{
*/
#include "apr_hooks.h"
#include "apr_optional.h"
#include "apr.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_buckets.h"
#include "apr_md5.h"
#include "apr_network_io.h"
#include "apr_pools.h"
#include "apr_strings.h"
#include "apr_uri.h"
#include "apr_date.h"
#include "apr_strmatch.h"
#include "apr_fnmatch.h"
#include "apr_reslist.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "apr_uuid.h"
#include "util_mutex.h"
#include "apr_global_mutex.h"
#include "apr_thread_mutex.h"
#include "httpd.h"
#include "http_config.h"
#include "ap_config.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_request.h"
#include "http_vhost.h"
#include "http_main.h"
#include "http_log.h"
#include "http_connection.h"
#include "http_ssl.h"
#include "util_filter.h"
#include "util_ebcdic.h"
#include "ap_provider.h"
#include "ap_slotmem.h"
#if APR_HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if APR_HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
/* for proxy_canonenc() */
enum enctype {
enc_path, enc_search, enc_user, enc_fpath, enc_parm
};
/* Flags for ap_proxy_canonenc_ex */
#define PROXY_CANONENC_FORCEDEC 0x01
#define PROXY_CANONENC_NOENCODEDSLASHENCODING 0x02
typedef enum {
NONE, TCP, OPTIONS, HEAD, GET, CPING, PROVIDER, OPTIONS11, HEAD11, GET11, EOT
} hcmethod_t;
typedef struct {
hcmethod_t method;
char *name;
int implemented;
} proxy_hcmethods_t;
typedef struct {
unsigned int bit;
char flag;
const char *name;
} proxy_wstat_t;
#define BALANCER_PREFIX "balancer://"
#if APR_CHARSET_EBCDIC
#define CRLF "\r\n"
#else /*APR_CHARSET_EBCDIC*/
#define CRLF "\015\012"
#endif /*APR_CHARSET_EBCDIC*/
/* default Max-Forwards header setting */
/* Set this to -1, which complies with RFC2616 by not setting
* max-forwards if the client didn't send it to us.
*/
#define DEFAULT_MAX_FORWARDS -1
typedef struct proxy_balancer proxy_balancer;
typedef struct proxy_worker proxy_worker;
typedef struct proxy_conn_pool proxy_conn_pool;
typedef struct proxy_balancer_method proxy_balancer_method;
/* static information about a remote proxy */
struct proxy_remote {
const char *scheme; /* the schemes handled by this proxy, or '*' */
const char *protocol; /* the scheme used to talk to this proxy */
const char *hostname; /* the hostname of this proxy */
ap_regex_t *regexp; /* compiled regex (if any) for the remote */
const char *creds; /* auth credentials (if any) for the proxy */
int use_regex; /* simple boolean. True if we have a regex pattern */
apr_port_t port; /* the port for this proxy */
};
#define PROXYPASS_NOCANON 0x01
#define PROXYPASS_INTERPOLATE 0x02
#define PROXYPASS_NOQUERY 0x04
#define PROXYPASS_MAP_ENCODED 0x08
#define PROXYPASS_MAP_SERVLET 0x18 /* + MAP_ENCODED */
struct proxy_alias {
const char *real;
const char *fake;
ap_regex_t *regex;
unsigned int flags;
proxy_balancer *balancer; /* only valid for reverse-proxys */
};
struct dirconn_entry {
char *name;
struct in_addr addr, mask;
struct apr_sockaddr_t *hostaddr;
int (*matcher) (struct dirconn_entry * This, request_rec *r);
};
struct noproxy_entry {
const char *name;
struct apr_sockaddr_t *addr;
};
typedef struct {
apr_array_header_t *proxies;
apr_array_header_t *sec_proxy;
apr_array_header_t *aliases;
apr_array_header_t *noproxies;
apr_array_header_t *dirconn;
apr_array_header_t *workers; /* non-balancer workers, eg ProxyPass http://example.com */
apr_array_header_t *balancers; /* list of balancers @ config time */
proxy_worker *forward; /* forward proxy worker */
proxy_worker *reverse; /* reverse "module-driven" proxy worker */
const char *domain; /* domain name to use in absence of a domain name in the request */
const char *id;
apr_pool_t *pool; /* Pool used for allocating this struct's elements */
int req; /* true if proxy requests are enabled */
int max_balancers; /* maximum number of allowed balancers */
int bgrowth; /* number of post-config balancers can added */
enum {
via_off,
via_on,
via_block,
via_full
} viaopt; /* how to deal with proxy Via: headers */
apr_size_t recv_buffer_size;
apr_size_t io_buffer_size;
long maxfwd;
apr_interval_time_t timeout;
enum {
bad_error,
bad_ignore,
bad_body
} badopt; /* how to deal with bad headers */
enum {
status_off,
status_on,
status_full
} proxy_status; /* Status display options */
apr_sockaddr_t *source_address;
apr_global_mutex_t *mutex; /* global lock, for pool, etc */
ap_slotmem_instance_t *bslot; /* balancers shm data - runtime */
ap_slotmem_provider_t *storage;
unsigned int req_set:1;
unsigned int viaopt_set:1;
unsigned int recv_buffer_size_set:1;
unsigned int io_buffer_size_set:1;
unsigned int maxfwd_set:1;
unsigned int timeout_set:1;
unsigned int badopt_set:1;
unsigned int proxy_status_set:1;
unsigned int source_address_set:1;
unsigned int bgrowth_set:1;
unsigned int bal_persist:1;
unsigned int inherit:1;
unsigned int inherit_set:1;
unsigned int ppinherit:1;
unsigned int ppinherit_set:1;
unsigned int map_encoded_one:1;
unsigned int map_encoded_all:1;
} proxy_server_conf;
typedef struct {
const char *p; /* The path */
ap_regex_t *r; /* Is this a regex? */
/* FIXME
* ProxyPassReverse and friends are documented as working inside
* <Location>. But in fact they never have done in the case of
* more than one <Location>, because the server_conf can't see it.
* We need to move them to the per-dir config.
* Discussed in February 2005:
* http://marc.theaimsgroup.com/?l=apache-httpd-dev&m=110726027118798&w=2
*/
apr_array_header_t *raliases;
apr_array_header_t* cookie_paths;
apr_array_header_t* cookie_domains;
signed char p_is_fnmatch; /* Is the path an fnmatch candidate? */
signed char interpolate_env;
struct proxy_alias *alias;
/**
* the following setting masks the error page
* returned from the 'proxied server' and just
* forwards the status code upwards.
* This allows the main server (us) to generate
* the error page, (so it will look like a error
* returned from the rest of the system
*/
unsigned int error_override:1;
unsigned int preserve_host:1;
unsigned int preserve_host_set:1;
unsigned int error_override_set:1;
unsigned int alias_set:1;
unsigned int add_forwarded_headers:1;
unsigned int add_forwarded_headers_set:1;
/** Named back references */
apr_array_header_t *refs;
unsigned int forward_100_continue:1;
unsigned int forward_100_continue_set:1;
apr_array_header_t *error_override_codes;
} proxy_dir_conf;
/* if we interpolate env vars per-request, we'll need a per-request
* copy of the reverse proxy config
*/
typedef struct {
apr_array_header_t *raliases;
apr_array_header_t* cookie_paths;
apr_array_header_t* cookie_domains;
} proxy_req_conf;
struct proxy_address; /* opaque TTL'ed and refcount'ed address */
typedef struct {
conn_rec *connection;
request_rec *r; /* Request record of the backend request
* that is used over the backend connection. */
proxy_worker *worker; /* Connection pool this connection belongs to */
apr_pool_t *pool; /* Subpool for hostname and addr data */
const char *hostname;
apr_sockaddr_t *addr; /* Preparsed remote address info */
apr_pool_t *scpool; /* Subpool used for socket and connection data */
apr_socket_t *sock; /* Connection socket */
void *data; /* per scheme connection data */
void *forward; /* opaque forward proxy data */
apr_uint32_t flags; /* Connection flags */
apr_port_t port;
unsigned int is_ssl:1;
unsigned int close:1; /* Close 'this' connection */
unsigned int need_flush:1; /* Flag to decide whether we need to flush the
* filter chain or not */
unsigned int inreslist:1; /* connection in apr_reslist? */
const char *uds_path; /* Unix domain socket path */
const char *ssl_hostname;/* Hostname (SNI) in use by SSL connection */
apr_bucket_brigade *tmp_bb;/* Temporary brigade created with the connection
* and its scpool/bucket_alloc (NULL before),
* must be left cleaned when used (locally).
*/
apr_pool_t *uds_pool; /* Subpool for reusing UDS paths */
apr_pool_t *fwd_pool; /* Subpool for reusing ProxyRemote infos */
struct proxy_address *address; /* Current remote address */
} proxy_conn_rec;
typedef struct {
float cache_completion; /* completion percentage */
int content_length; /* length of the content */
} proxy_completion;
/* Connection pool */
struct proxy_conn_pool {
apr_pool_t *pool; /* The pool used in constructor and destructor calls */
apr_sockaddr_t *addr; /* Preparsed remote address info */
apr_reslist_t *res; /* Connection resource list */
proxy_conn_rec *conn; /* Single connection for prefork mpm */
apr_pool_t *dns_pool; /* The pool used for worker scoped DNS resolutions */
};
#define AP_VOLATILIZE_T(T, x) (*(T volatile *)&(x))
/* worker status bits */
/*
* NOTE: Keep up-to-date w/ proxy_wstat_tbl[]
* in mod_proxy.c !
*/
#define PROXY_WORKER_INITIALIZED 0x0001
#define PROXY_WORKER_IGNORE_ERRORS 0x0002
#define PROXY_WORKER_DRAIN 0x0004
#define PROXY_WORKER_GENERIC 0x0008
#define PROXY_WORKER_IN_SHUTDOWN 0x0010
#define PROXY_WORKER_DISABLED 0x0020
#define PROXY_WORKER_STOPPED 0x0040
#define PROXY_WORKER_IN_ERROR 0x0080
#define PROXY_WORKER_HOT_STANDBY 0x0100
#define PROXY_WORKER_FREE 0x0200
#define PROXY_WORKER_HC_FAIL 0x0400
#define PROXY_WORKER_HOT_SPARE 0x0800
/* worker status flags */
#define PROXY_WORKER_INITIALIZED_FLAG 'O'
#define PROXY_WORKER_IGNORE_ERRORS_FLAG 'I'
#define PROXY_WORKER_DRAIN_FLAG 'N'
#define PROXY_WORKER_GENERIC_FLAG 'G'
#define PROXY_WORKER_IN_SHUTDOWN_FLAG 'U'
#define PROXY_WORKER_DISABLED_FLAG 'D'
#define PROXY_WORKER_STOPPED_FLAG 'S'
#define PROXY_WORKER_IN_ERROR_FLAG 'E'
#define PROXY_WORKER_HOT_STANDBY_FLAG 'H'
#define PROXY_WORKER_FREE_FLAG 'F'
#define PROXY_WORKER_HC_FAIL_FLAG 'C'
#define PROXY_WORKER_HOT_SPARE_FLAG 'R'
#define PROXY_WORKER_NOT_USABLE_BITMAP ( PROXY_WORKER_IN_SHUTDOWN | \
PROXY_WORKER_DISABLED | PROXY_WORKER_STOPPED | PROXY_WORKER_IN_ERROR | \
PROXY_WORKER_HC_FAIL )
/* NOTE: these check the shared status */
#define PROXY_WORKER_IS_INITIALIZED(f) ( (f)->s->status & PROXY_WORKER_INITIALIZED )
#define PROXY_WORKER_IS_STANDBY(f) ( (f)->s->status & PROXY_WORKER_HOT_STANDBY )
#define PROXY_WORKER_IS_SPARE(f) ( (f)->s->status & PROXY_WORKER_HOT_SPARE )
#define PROXY_WORKER_IS_USABLE(f) ( ( !( (f)->s->status & PROXY_WORKER_NOT_USABLE_BITMAP) ) && \
PROXY_WORKER_IS_INITIALIZED(f) )
#define PROXY_WORKER_IS_DRAINING(f) ( (f)->s->status & PROXY_WORKER_DRAIN )
#define PROXY_WORKER_IS_GENERIC(f) ( (f)->s->status & PROXY_WORKER_GENERIC )
#define PROXY_WORKER_IS_HCFAILED(f) ( (f)->s->status & PROXY_WORKER_HC_FAIL )
#define PROXY_WORKER_IS_ERROR(f) ( (f)->s->status & PROXY_WORKER_IN_ERROR )
#define PROXY_WORKER_IS(f, b) ( (f)->s->status & (b) )
/* default worker retry timeout in seconds */
#define PROXY_WORKER_DEFAULT_RETRY 60
/* Some max char string sizes, for shm fields */
#define PROXY_WORKER_MAX_SCHEME_SIZE 16
#define PROXY_WORKER_MAX_ROUTE_SIZE 64
#define PROXY_BALANCER_MAX_ROUTE_SIZE PROXY_WORKER_MAX_ROUTE_SIZE
#define PROXY_WORKER_MAX_NAME_SIZE 96
#define PROXY_BALANCER_MAX_NAME_SIZE PROXY_WORKER_MAX_NAME_SIZE
#define PROXY_WORKER_MAX_HOSTNAME_SIZE 64
#define PROXY_BALANCER_MAX_HOSTNAME_SIZE PROXY_WORKER_MAX_HOSTNAME_SIZE
#define PROXY_BALANCER_MAX_STICKY_SIZE 64
#define PROXY_WORKER_MAX_SECRET_SIZE 64
#define PROXY_RFC1035_HOSTNAME_SIZE 256
#define PROXY_WORKER_EXT_NAME_SIZE 384
/* RFC-1035 mentions limits of 255 for host-names and 253 for domain-names,
* dotted together(?) this would fit the below size (+ trailing NUL).
*/
#define PROXY_WORKER_RFC1035_NAME_SIZE 512
#define PROXY_MAX_PROVIDER_NAME_SIZE 16
#define PROXY_STRNCPY(dst, src) ap_proxy_strncpy((dst), (src), (sizeof(dst)))
#define PROXY_COPY_CONF_PARAMS(w, c) \
do { \
(w)->s->timeout = (c)->timeout; \
(w)->s->timeout_set = (c)->timeout_set; \
(w)->s->recv_buffer_size = (c)->recv_buffer_size; \
(w)->s->recv_buffer_size_set = (c)->recv_buffer_size_set; \
(w)->s->io_buffer_size = (c)->io_buffer_size; \
(w)->s->io_buffer_size_set = (c)->io_buffer_size_set; \
} while (0)
#define PROXY_SHOULD_PING_100_CONTINUE(w, r) \
((w)->s->ping_timeout_set \
&& (PROXYREQ_REVERSE == (r)->proxyreq) \
&& ap_request_has_body((r)))
#define PROXY_DO_100_CONTINUE(w, r) \
(PROXY_SHOULD_PING_100_CONTINUE(w, r) \
&& !apr_table_get((r)->subprocess_env, "force-proxy-request-1.0"))
/* use 2 hashes */
typedef struct {
unsigned int def;
unsigned int fnv;
} proxy_hashes ;
/* Runtime worker status information. Shared in scoreboard */
/* The addition of member uds_path in 2.4.7 was an incompatible API change. */
typedef struct {
char name[PROXY_WORKER_MAX_NAME_SIZE];
char scheme[PROXY_WORKER_MAX_SCHEME_SIZE]; /* scheme to use ajp|http|https */
char hostname[PROXY_WORKER_MAX_HOSTNAME_SIZE]; /* remote backend address (deprecated, use hostname_ex below) */
char route[PROXY_WORKER_MAX_ROUTE_SIZE]; /* balancing route */
char redirect[PROXY_WORKER_MAX_ROUTE_SIZE]; /* temporary balancing redirection route */
char flusher[PROXY_WORKER_MAX_SCHEME_SIZE]; /* flush provider used by mod_proxy_fdpass */
char uds_path[PROXY_WORKER_MAX_NAME_SIZE]; /* path to worker's unix domain socket if applicable */
int lbset; /* load balancer cluster set */
int retries; /* number of retries on this worker */
int lbstatus; /* Current lbstatus */
int lbfactor; /* dynamic lbfactor */
int min; /* Desired minimum number of available connections */
int smax; /* Soft maximum on the total number of connections */
int hmax; /* Hard maximum on the total number of connections */
int flush_wait; /* poll wait time in microseconds if flush_auto */
int index; /* shm array index */
proxy_hashes hash; /* hash of worker name */
unsigned int status; /* worker status bitfield */
enum {
flush_off,
flush_on,
flush_auto
} flush_packets; /* control AJP flushing */
apr_time_t updated; /* timestamp of last update for dynamic workers, or queue-time of HC workers */
apr_time_t error_time; /* time of the last error */
apr_interval_time_t ttl; /* maximum amount of time in seconds a connection
* may be available while exceeding the soft limit */
apr_interval_time_t retry; /* retry interval */
apr_interval_time_t timeout; /* connection timeout */
apr_interval_time_t acquire; /* acquire timeout when the maximum number of connections is exceeded */
apr_interval_time_t ping_timeout;
apr_interval_time_t conn_timeout;
apr_size_t recv_buffer_size;
apr_size_t io_buffer_size;
apr_size_t elected; /* Number of times the worker was elected */
apr_size_t busy; /* busyness factor */
apr_port_t port;
apr_off_t transferred;/* Number of bytes transferred to remote */
apr_off_t read; /* Number of bytes read from remote */
void *context; /* general purpose storage */
unsigned int keepalive:1;
unsigned int disablereuse:1;
unsigned int is_address_reusable:1;
unsigned int retry_set:1;
unsigned int timeout_set:1;
unsigned int acquire_set:1;
unsigned int ping_timeout_set:1;
unsigned int conn_timeout_set:1;
unsigned int recv_buffer_size_set:1;
unsigned int io_buffer_size_set:1;
unsigned int keepalive_set:1;
unsigned int disablereuse_set:1;
unsigned int was_malloced:1;
unsigned int is_name_matchable:1;
char hcuri[PROXY_WORKER_MAX_ROUTE_SIZE]; /* health check uri */
char hcexpr[PROXY_WORKER_MAX_SCHEME_SIZE]; /* name of condition expr for health check */
int passes; /* number of successes for check to pass */
int pcount; /* current count of passes */
int fails; /* number of failures for check to fail */
int fcount; /* current count of failures */
hcmethod_t method; /* method to use for health check */
apr_interval_time_t interval;
char upgrade[PROXY_WORKER_MAX_SCHEME_SIZE];/* upgrade protocol used by mod_proxy_wstunnel */
char hostname_ex[PROXY_RFC1035_HOSTNAME_SIZE]; /* RFC1035 compliant version of the remote backend address */
apr_size_t response_field_size; /* Size of proxy response buffer in bytes. */
unsigned int response_field_size_set:1;
char secret[PROXY_WORKER_MAX_SECRET_SIZE]; /* authentication secret (e.g. AJP13) */
char name_ex[PROXY_WORKER_EXT_NAME_SIZE]; /* Extended name (>96 chars for 2.4.x) */
unsigned int address_ttl_set:1;
apr_int32_t address_ttl; /* backend address' TTL (seconds) */
apr_uint32_t address_expiry; /* backend address' next expiry time */
} proxy_worker_shared;
#define ALIGNED_PROXY_WORKER_SHARED_SIZE (APR_ALIGN_DEFAULT(sizeof(proxy_worker_shared)))
/* Worker configuration */
struct proxy_worker {
proxy_hashes hash; /* hash of worker name */
unsigned int local_status; /* status of per-process worker */
proxy_conn_pool *cp; /* Connection pool to use */
proxy_worker_shared *s; /* Shared data */
proxy_balancer *balancer; /* which balancer am I in? */
#if APR_HAS_THREADS
apr_thread_mutex_t *tmutex; /* Thread lock for updating address cache */
#endif
void *context; /* general purpose storage */
ap_conf_vector_t *section_config; /* <Proxy>-section wherein defined */
struct proxy_address *volatile address; /* current worker address (if reusable) */
};
/* default to health check every 30 seconds */
#define HCHECK_WATHCHDOG_DEFAULT_INTERVAL (30)
/* The watchdog runs every 2 seconds, which is also the minimal check */
#define HCHECK_WATHCHDOG_INTERVAL (2)
/*
* Time to wait (in microseconds) to find out if more data is currently
* available at the backend.
*/
#define PROXY_FLUSH_WAIT 10000
typedef struct {
char sticky_path[PROXY_BALANCER_MAX_STICKY_SIZE]; /* URL sticky session identifier */
char sticky[PROXY_BALANCER_MAX_STICKY_SIZE]; /* sticky session identifier */
char lbpname[PROXY_MAX_PROVIDER_NAME_SIZE]; /* lbmethod provider name */
char nonce[APR_UUID_FORMATTED_LENGTH + 1];
char name[PROXY_BALANCER_MAX_NAME_SIZE];
char sname[PROXY_BALANCER_MAX_NAME_SIZE];
char vpath[PROXY_BALANCER_MAX_ROUTE_SIZE];
char vhost[PROXY_BALANCER_MAX_HOSTNAME_SIZE];
apr_interval_time_t timeout; /* Timeout for waiting on free connection */
apr_time_t wupdated; /* timestamp of last change to workers list */
int max_attempts; /* Number of attempts before failing */
int index; /* shm array index */
proxy_hashes hash;
unsigned int sticky_force:1; /* Disable failover for sticky sessions */
unsigned int scolonsep:1; /* true if ';' seps sticky session paths */
unsigned int max_attempts_set:1;
unsigned int was_malloced:1;
unsigned int need_reset:1;
unsigned int vhosted:1;
unsigned int inactive:1;
unsigned int forcerecovery:1;
char sticky_separator; /* separator for sessionid/route */
unsigned int forcerecovery_set:1;
unsigned int scolonsep_set:1;
unsigned int sticky_force_set:1;
unsigned int nonce_set:1;
unsigned int sticky_separator_set:1;
} proxy_balancer_shared;
#define ALIGNED_PROXY_BALANCER_SHARED_SIZE (APR_ALIGN_DEFAULT(sizeof(proxy_balancer_shared)))
struct proxy_balancer {
apr_array_header_t *workers; /* initially configured workers */
apr_array_header_t *errstatuses; /* statuses to force members into error */
ap_slotmem_instance_t *wslot; /* worker shm data - runtime */
ap_slotmem_provider_t *storage;
int growth; /* number of post-config workers can added */
int max_workers; /* maximum number of allowed workers */
proxy_hashes hash;
apr_time_t wupdated; /* timestamp of last change to workers list */
proxy_balancer_method *lbmethod;
apr_global_mutex_t *gmutex; /* global lock for updating list of workers */
#if APR_HAS_THREADS
apr_thread_mutex_t *tmutex; /* Thread lock for updating shm */
#endif
proxy_server_conf *sconf;
void *context; /* general purpose storage */
proxy_balancer_shared *s; /* Shared data */
int failontimeout; /* Whether to mark a member in Err if IO timeout occurs */
unsigned int failontimeout_set:1;
unsigned int growth_set:1;
unsigned int lbmethod_set:1;
ap_conf_vector_t *section_config; /* <Proxy>-section wherein defined */
};
struct proxy_balancer_method {
const char *name; /* name of the load balancer method*/
proxy_worker *(*finder)(proxy_balancer *balancer,
request_rec *r);
void *context; /* general purpose storage */
apr_status_t (*reset)(proxy_balancer *balancer, server_rec *s);
apr_status_t (*age)(proxy_balancer *balancer, server_rec *s);
apr_status_t (*updatelbstatus)(proxy_balancer *balancer, proxy_worker *elected, server_rec *s);
};
#define PROXY_THREAD_LOCK(x) ( (x) && (x)->tmutex ? apr_thread_mutex_lock((x)->tmutex) : APR_SUCCESS)
#define PROXY_THREAD_UNLOCK(x) ( (x) && (x)->tmutex ? apr_thread_mutex_unlock((x)->tmutex) : APR_SUCCESS)
#define PROXY_GLOBAL_LOCK(x) ( (x) && (x)->gmutex ? apr_global_mutex_lock((x)->gmutex) : APR_SUCCESS)
#define PROXY_GLOBAL_UNLOCK(x) ( (x) && (x)->gmutex ? apr_global_mutex_unlock((x)->gmutex) : APR_SUCCESS)
/* hooks */
/* Create a set of PROXY_DECLARE(type), PROXY_DECLARE_NONSTD(type) and
* PROXY_DECLARE_DATA with appropriate export and import tags for the platform
*/
#if !defined(WIN32)
#define PROXY_DECLARE(type) type
#define PROXY_DECLARE_NONSTD(type) type
#define PROXY_DECLARE_DATA
#elif defined(PROXY_DECLARE_STATIC)
#define PROXY_DECLARE(type) type __stdcall
#define PROXY_DECLARE_NONSTD(type) type
#define PROXY_DECLARE_DATA
#elif defined(PROXY_DECLARE_EXPORT)
#define PROXY_DECLARE(type) __declspec(dllexport) type __stdcall
#define PROXY_DECLARE_NONSTD(type) __declspec(dllexport) type
#define PROXY_DECLARE_DATA __declspec(dllexport)
#else
#define PROXY_DECLARE(type) __declspec(dllimport) type __stdcall
#define PROXY_DECLARE_NONSTD(type) __declspec(dllimport) type
#define PROXY_DECLARE_DATA __declspec(dllimport)
#endif
/* Using PROXY_DECLARE_OPTIONAL_HOOK instead of
* APR_DECLARE_EXTERNAL_HOOK allows build/make_nw_export.awk
* to distinguish between hooks that implement
* proxy_hook_xx and proxy_hook_get_xx in mod_proxy.c and
* those which don't.
*/
#define PROXY_DECLARE_OPTIONAL_HOOK APR_DECLARE_EXTERNAL_HOOK
/* These 2 are in mod_proxy.c */
extern PROXY_DECLARE_DATA proxy_hcmethods_t proxy_hcmethods[];
extern PROXY_DECLARE_DATA proxy_wstat_t proxy_wstat_tbl[];
/* Following 4 from health check */
APR_DECLARE_OPTIONAL_FN(void, hc_show_exprs, (request_rec *));
APR_DECLARE_OPTIONAL_FN(void, hc_select_exprs, (request_rec *, const char *));
APR_DECLARE_OPTIONAL_FN(int, hc_valid_expr, (request_rec *, const char *));
APR_DECLARE_OPTIONAL_FN(const char *, set_worker_hc_param,
(apr_pool_t *, server_rec *, proxy_worker *,
const char *, const char *, void *));
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, section_post_config,
(apr_pool_t *p, apr_pool_t *plog,
apr_pool_t *ptemp, server_rec *s,
ap_conf_vector_t *section_config))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, scheme_handler,
(request_rec *r, proxy_worker *worker,
proxy_server_conf *conf, char *url,
const char *proxyhost, apr_port_t proxyport))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, check_trans,
(request_rec *r, const char *url))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, canon_handler,
(request_rec *r, char *url))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, create_req, (request_rec *r, request_rec *pr))
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, fixups, (request_rec *r))
/**
* pre request hook.
* It will return the most suitable worker at the moment
* and corresponding balancer.
* The url is rewritten from balancer://cluster/uri to scheme://host:port/uri
* and then the scheme_handler is called.
*
*/
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, pre_request, (proxy_worker **worker,
proxy_balancer **balancer,
request_rec *r,
proxy_server_conf *conf, char **url))
/**
* post request hook.
* It is called after request for updating runtime balancer status.
*/
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, post_request, (proxy_worker *worker,
proxy_balancer *balancer, request_rec *r,
proxy_server_conf *conf))
/**
* request status hook
* It is called after all proxy processing has been done. This gives other
* modules a chance to create default content on failure, for example
*/
APR_DECLARE_EXTERNAL_HOOK(proxy, PROXY, int, request_status,
(int *status, request_rec *r))
/* proxy_util.c */
PROXY_DECLARE(apr_status_t) ap_proxy_strncpy(char *dst, const char *src,
apr_size_t dlen);
PROXY_DECLARE(int) ap_proxy_hex2c(const char *x);
PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x);
PROXY_DECLARE(char *)ap_proxy_canonenc_ex(apr_pool_t *p, const char *x, int len, enum enctype t,
int flags, int proxyreq);
PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
int forcedec, int proxyreq);
PROXY_DECLARE(char *)ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
char **passwordp, char **hostp, apr_port_t *port);
PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message);
PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, apr_sockaddr_t *uri_addr);
/** Test whether the hostname/address of the request are blocked by the ProxyBlock
* configuration.
* @param r request
* @param conf server configuration
* @param hostname hostname from request URI
* @param addr resolved address of hostname, or NULL if not known
* @return OK on success, or else an error
*/
PROXY_DECLARE(int) ap_proxy_checkproxyblock2(request_rec *r, proxy_server_conf *conf,
const char *hostname, apr_sockaddr_t *addr);
PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r);
/* DEPRECATED (will be replaced with ap_proxy_connect_backend */
PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **, const char *, apr_sockaddr_t *, const char *, proxy_server_conf *, request_rec *);
/* DEPRECATED (will be replaced with ap_proxy_check_connection */
PROXY_DECLARE(apr_status_t) ap_proxy_ssl_connection_cleanup(proxy_conn_rec *conn,
request_rec *r);
PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c);
PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c);
PROXY_DECLARE(int) ap_proxy_ssl_engine(conn_rec *c,
ap_conf_vector_t *per_dir_config,
int enable);
PROXY_DECLARE(int) ap_proxy_conn_is_https(conn_rec *c);
PROXY_DECLARE(const char *) ap_proxy_ssl_val(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, const char *var);
/* Header mapping functions, and a typedef of their signature */
PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *url);
PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r, proxy_dir_conf *conf, const char *str);
#if !defined(WIN32)
typedef const char *(*ap_proxy_header_reverse_map_fn)(request_rec *,
proxy_dir_conf *, const char *);
#elif defined(PROXY_DECLARE_STATIC)
typedef const char *(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
proxy_dir_conf *, const char *);
#elif defined(PROXY_DECLARE_EXPORT)
typedef __declspec(dllexport) const char *
(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
proxy_dir_conf *, const char *);
#else
typedef __declspec(dllimport) const char *
(__stdcall *ap_proxy_header_reverse_map_fn)(request_rec *,
proxy_dir_conf *, const char *);
#endif
/* Connection pool API */
/**
* Return the user-land, UDS aware worker name
* @param p memory pool used for displaying worker name
* @param worker the worker
* @return name
*/
PROXY_DECLARE(char *) ap_proxy_worker_name(apr_pool_t *p,
proxy_worker *worker);
/**
* Return whether a worker upgrade configuration matches Upgrade header
* @param p memory pool used for displaying worker name
* @param worker the worker
* @param upgrade the Upgrade header to match
* @param dflt default protocol (NULL for none)
* @return 1 (true) or 0 (false)
*/
PROXY_DECLARE(int) ap_proxy_worker_can_upgrade(apr_pool_t *p,
const proxy_worker *worker,
const char *upgrade,
const char *dflt);
/* Bitmask for ap_proxy_{define,get}_worker_ex(). */
#define AP_PROXY_WORKER_IS_PREFIX (1u << 0)
#define AP_PROXY_WORKER_IS_MATCH (1u << 1)
#define AP_PROXY_WORKER_IS_MALLOCED (1u << 2)
#define AP_PROXY_WORKER_NO_UDS (1u << 3)
/**
* Get the worker from proxy configuration, looking for either PREFIXED or
* MATCHED or both types of workers according to given mask
* @param p memory pool used for finding worker
* @param balancer the balancer that the worker belongs to
* @param conf current proxy server configuration
* @param url url to find the worker from
* @param mask bitmask of AP_PROXY_WORKER_IS_*
* @return proxy_worker or NULL if not found
*/
PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker_ex(apr_pool_t *p,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
unsigned int mask);
/**
* Get the worker from proxy configuration, both types
* @param p memory pool used for finding worker
* @param balancer the balancer that the worker belongs to
* @param conf current proxy server configuration
* @param url url to find the worker from
* @return proxy_worker or NULL if not found
*/
PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url);
/**
* Define and Allocate space for the worker to proxy configuration, of either
* PREFIXED or MATCHED type according to given mask
* @param p memory pool to allocate worker from
* @param worker the new worker
* @param balancer the balancer that the worker belongs to
* @param conf current proxy server configuration
* @param url url containing worker name
* @param mask bitmask of AP_PROXY_WORKER_IS_*
* @return error message or NULL if successful (*worker is new worker)
*/
PROXY_DECLARE(char *) ap_proxy_define_worker_ex(apr_pool_t *p,
proxy_worker **worker,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
unsigned int mask);
/**
* Define and Allocate space for the worker to proxy configuration
* @param p memory pool to allocate worker from
* @param worker the new worker
* @param balancer the balancer that the worker belongs to
* @param conf current proxy server configuration
* @param url url containing worker name
* @param do_malloc true if shared struct should be malloced
* @return error message or NULL if successful (*worker is new worker)
*/
PROXY_DECLARE(char *) ap_proxy_define_worker(apr_pool_t *p,
proxy_worker **worker,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
int do_malloc);
/**
* Define and Allocate space for the ap_strcmp_match()able worker to proxy
* configuration.
* @param p memory pool to allocate worker from
* @param worker the new worker
* @param balancer the balancer that the worker belongs to
* @param conf current proxy server configuration
* @param url url containing worker name (produces match pattern)
* @param do_malloc true if shared struct should be malloced
* @return error message or NULL if successful (*worker is new worker)
* @deprecated Replaced by ap_proxy_define_worker_ex()
*/
PROXY_DECLARE(char *) ap_proxy_define_match_worker(apr_pool_t *p,
proxy_worker **worker,
proxy_balancer *balancer,
proxy_server_conf *conf,
const char *url,
int do_malloc);
/**
* Share a defined proxy worker via shm
* @param worker worker to be shared
* @param shm location of shared info
* @param i index into shm
* @return APR_SUCCESS or error code
*/
PROXY_DECLARE(apr_status_t) ap_proxy_share_worker(proxy_worker *worker,
proxy_worker_shared *shm,
int i);
/**
* Initialize the worker by setting up worker connection pool and mutex
* @param worker worker to initialize
* @param s current server record
* @param p memory pool used for mutex and connection pool
* @return APR_SUCCESS or error code
*/
PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker,
server_rec *s,
apr_pool_t *p);
/**
* Verifies valid balancer name (eg: balancer://foo)
* @param name name to test
* @param i number of chars to test; 0 for all.
* @return true/false
*/
PROXY_DECLARE(int) ap_proxy_valid_balancer_name(char *name, int i);
/**
* Get the balancer from proxy configuration
* @param p memory pool used for temporary storage while finding balancer
* @param conf current proxy server configuration
* @param url url to find the worker from; must have balancer:// prefix
* @param careactive true if we care if the balancer is active or not
* @return proxy_balancer or NULL if not found
*/
PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
proxy_server_conf *conf,
const char *url,
int careactive);
/**
* Update the balancer's vhost related fields
* @param p memory pool used for temporary storage while finding balancer
* @param balancer balancer to be updated
* @param url url to find vhost info
* @return error string or NULL if OK
*/
PROXY_DECLARE(char *) ap_proxy_update_balancer(apr_pool_t *p,
proxy_balancer *balancer,
const char *url);
/**
* Define and Allocate space for the balancer to proxy configuration
* @param p memory pool to allocate balancer from
* @param balancer the new balancer
* @param conf current proxy server configuration
* @param url url containing balancer name
* @param alias alias/fake-path to this balancer
* @param do_malloc true if shared struct should be malloced
* @return error message or NULL if successful
*/
PROXY_DECLARE(char *) ap_proxy_define_balancer(apr_pool_t *p,
proxy_balancer **balancer,
proxy_server_conf *conf,
const char *url,
const char *alias,
int do_malloc);
/**
* Share a defined proxy balancer via shm
* @param balancer balancer to be shared
* @param shm location of shared info
* @param i index into shm
* @return APR_SUCCESS or error code
*/
PROXY_DECLARE(apr_status_t) ap_proxy_share_balancer(proxy_balancer *balancer,
proxy_balancer_shared *shm,
int i);
/**
* Initialize the balancer as needed
* @param balancer balancer to initialize
* @param s current server record
* @param p memory pool used for mutex and connection pool
* @return APR_SUCCESS or error code
*/
PROXY_DECLARE(apr_status_t) ap_proxy_initialize_balancer(proxy_balancer *balancer,
server_rec *s,
apr_pool_t *p);
typedef int (proxy_is_best_callback_fn_t)(proxy_worker *current, proxy_worker *prev_best, void *baton);
/**
* Retrieve the best worker in a balancer for the current request
* @param balancer balancer for which to find the best worker
* @param r current request record
* @param is_best a callback function provide by the lbmethod
* that determines if the current worker is best
* @param baton an lbmethod-specific context pointer (baton)
* passed to the is_best callback
* @return the best worker to be used for the request
*/
PROXY_DECLARE(proxy_worker *) ap_proxy_balancer_get_best_worker(proxy_balancer *balancer,
request_rec *r,
proxy_is_best_callback_fn_t *is_best,
void *baton);
/*
* Needed by the lb modules.
*/
APR_DECLARE_OPTIONAL_FN(proxy_worker *, proxy_balancer_get_best_worker,
(proxy_balancer *balancer,
request_rec *r,
proxy_is_best_callback_fn_t *is_best,
void *baton));
/**
* Find the shm of the worker as needed
* @param storage slotmem provider
* @param slot slotmem instance
* @param worker worker to find
* @param index pointer to index within slotmem of worker
* @return pointer to shm of worker, or NULL
*/
PROXY_DECLARE(proxy_worker_shared *) ap_proxy_find_workershm(ap_slotmem_provider_t *storage,
ap_slotmem_instance_t *slot,
proxy_worker *worker,
unsigned int *index);
/**
* Find the shm of the balancer as needed
* @param storage slotmem provider
* @param slot slotmem instance
* @param balancer balancer of shm to find
* @param index pointer to index within slotmem of balancer
* @return pointer to shm of balancer, or NULL
*/
PROXY_DECLARE(proxy_balancer_shared *) ap_proxy_find_balancershm(ap_slotmem_provider_t *storage,
ap_slotmem_instance_t *slot,
proxy_balancer *balancer,
unsigned int *index);
/**
* Get the most suitable worker and/or balancer for the request
* @param worker worker used for processing request
* @param balancer balancer used for processing request
* @param r current request
* @param conf current proxy server configuration
* @param url request url that balancer can rewrite.
* @return OK or HTTP_XXX error
* @note It calls balancer pre_request hook if the url starts with balancer://
* The balancer then rewrites the url to particular worker, like http://host:port
*/
PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
proxy_balancer **balancer,
request_rec *r,
proxy_server_conf *conf,
char **url);
/**
* Post request worker and balancer cleanup
* @param worker worker used for processing request
* @param balancer balancer used for processing request
* @param r current request
* @param conf current proxy server configuration
* @return OK or HTTP_XXX error
* @note Whenever the pre_request is called, the post_request has to be
* called too.
*/
PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
proxy_balancer *balancer,
request_rec *r,
proxy_server_conf *conf);
/* Bitmask for ap_proxy_determine_address() */
#define PROXY_DETERMINE_ADDRESS_CHECK (1u << 0)
/**
* Resolve an address, reusing the one of the worker if any.
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param conn proxy connection the address is used for
* @param hostname host to resolve (should be the worker's if reusable)
* @param hostport port to resolve (should be the worker's if reusable)
* @param flags bitmask of PROXY_DETERMINE_ADDRESS_*
* @param r current request (if any)
* @param s current server (or NULL if r != NULL and ap_proxyerror()
* should be called on error)
* @return APR_SUCCESS or an error, APR_EEXIST if the address is still
* the same and PROXY_DETERMINE_ADDRESS_CHECK is asked
*/
PROXY_DECLARE(apr_status_t) ap_proxy_determine_address(const char *proxy_function,
proxy_conn_rec *conn,
const char *hostname,
apr_port_t hostport,
unsigned int flags,
request_rec *r,
server_rec *s);
/**
* Determine backend hostname and port
* @param p memory pool used for processing
* @param r current request
* @param conf current proxy server configuration
* @param worker worker used for processing request
* @param conn proxy connection struct
* @param uri processed uri
* @param url request url
* @param proxyname are we connecting directly or via a proxy
* @param proxyport proxy host port
* @param server_portstr Via headers server port, must be non-NULL
* @param server_portstr_size size of the server_portstr buffer; must
* be at least one, even if the protocol doesn't use this
* @return OK or HTTP_XXX error
*/
PROXY_DECLARE(int) ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
proxy_server_conf *conf,
proxy_worker *worker,
proxy_conn_rec *conn,
apr_uri_t *uri,
char **url,
const char *proxyname,
apr_port_t proxyport,
char *server_portstr,
int server_portstr_size);
/**
* Mark a worker for retry
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param worker worker used for retrying
* @param s current server record
* @return OK if marked for retry, DECLINED otherwise
* @note The error status of the worker will cleared if the retry interval has
* elapsed since the last error.
*/
APR_DECLARE_OPTIONAL_FN(int, ap_proxy_retry_worker,
(const char *proxy_function, proxy_worker *worker, server_rec *s));
/**
* Acquire a connection from worker connection pool
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param conn acquired connection
* @param worker worker used for obtaining connection
* @param s current server record
* @return OK or HTTP_XXX error
* @note If the connection limit has been reached, the function will
* block until a connection becomes available or the timeout has
* elapsed.
*/
PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function,
proxy_conn_rec **conn,
proxy_worker *worker,
server_rec *s);
/**
* Release a connection back to worker connection pool
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param conn acquired connection
* @param s current server record
* @return OK or HTTP_XXX error
* @note The connection will be closed if conn->close_on_release is set
*/
PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function,
proxy_conn_rec *conn,
server_rec *s);
#define PROXY_CHECK_CONN_EMPTY (1 << 0)
/**
* Check a connection to the backend
* @param scheme calling proxy scheme (http, ajp, ...)
* @param conn acquired connection
* @param server current server record
* @param max_blank_lines how many blank lines to consume,
* or zero for none (considered data)
* @param flags PROXY_CHECK_* bitmask
* @return APR_SUCCESS: connection established,
* APR_ENOTEMPTY: connection established with data,
* APR_ENOSOCKET: not connected,
* APR_EINVAL: worker in error state (unusable),
* other: connection closed/aborted (remotely)
*/
PROXY_DECLARE(apr_status_t) ap_proxy_check_connection(const char *scheme,
proxy_conn_rec *conn,
server_rec *server,
unsigned max_blank_lines,
int flags);
/**
* Make a connection to the backend
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param conn acquired connection
* @param worker connection worker
* @param s current server record
* @return OK or HTTP_XXX error
* @note In case the socket already exists for conn, just check the link
* status.
*/
PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
proxy_conn_rec *conn,
proxy_worker *worker,
server_rec *s);
/**
* Make a connection to a Unix Domain Socket (UDS) path
* @param sock UDS to connect
* @param uds_path UDS path to connect to
* @param p pool to make the sock addr
* @return APR_SUCCESS or error status
*/
PROXY_DECLARE(apr_status_t) ap_proxy_connect_uds(apr_socket_t *sock,
const char *uds_path,
apr_pool_t *p);
/**
* Make a connection record for backend connection
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param conn acquired connection
* @param c client connection record (unused, deprecated)
* @param s current server record
* @return OK or HTTP_XXX error
* @note The function will return immediately if conn->connection
* is already set,
*/
PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function,
proxy_conn_rec *conn,
conn_rec *c, server_rec *s);
/**
* Make a connection record for backend connection, using request dir config
* @param proxy_function calling proxy scheme (http, ajp, ...)
* @param conn acquired connection
* @param r current request record
* @return OK or HTTP_XXX error
* @note The function will return immediately if conn->connection
* is already set,
*/
PROXY_DECLARE(int) ap_proxy_connection_create_ex(const char *proxy_function,
proxy_conn_rec *conn,
request_rec *r);
/**
* Determine if proxy connection can potentially be reused at the
* end of this request.
* @param conn proxy connection
* @return non-zero if reusable, 0 otherwise
* @note Even if this function returns non-zero, the connection may
* be subsequently marked for closure.
*/
PROXY_DECLARE(int) ap_proxy_connection_reusable(proxy_conn_rec *conn);
/**
* Signal the upstream chain that the connection to the backend broke in the
* middle of the response. This is done by sending an error bucket with
* status HTTP_BAD_GATEWAY and an EOS bucket up the filter chain.
* @param r current request record of client request
* @param brigade The brigade that is sent through the output filter chain
*/
PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r,
apr_bucket_brigade *brigade);
/**
* Return a hash based on the passed string
* @param str string to produce hash from
* @param method hashing method to use
* @return hash as unsigned int
*/
typedef enum { PROXY_HASHFUNC_DEFAULT, PROXY_HASHFUNC_APR, PROXY_HASHFUNC_FNV } proxy_hash_t;
PROXY_DECLARE(unsigned int) ap_proxy_hashfunc(const char *str, proxy_hash_t method);
/**
* Set/unset the worker status bitfield depending on flag
* @param c flag
* @param set set or unset bit
* @param w worker to use
* @return APR_SUCCESS if valid flag
*/
PROXY_DECLARE(apr_status_t) ap_proxy_set_wstatus(char c, int set, proxy_worker *w);
/**
* Create readable representation of worker status bitfield
* @param p pool
* @param w worker to use
* @return string representation of status
*/
PROXY_DECLARE(char *) ap_proxy_parse_wstatus(apr_pool_t *p, proxy_worker *w);
/**
* Sync balancer and workers based on any updates w/i shm
* @param b balancer to check/update member list of
* @param s server rec
* @param conf config
* @return APR_SUCCESS if all goes well
*/
PROXY_DECLARE(apr_status_t) ap_proxy_sync_balancer(proxy_balancer *b,
server_rec *s,
proxy_server_conf *conf);
/**
* Configure and create workers (and balancer) in mod_balancer.
* @param r request
* @param params table with the parameters like b=mycluster etc.
* @return 404 when the worker/balancer doesn't exist,
* 400 if something is invalid
* 200 for success.
*/
APR_DECLARE_OPTIONAL_FN(apr_status_t, balancer_manage,
(request_rec *, apr_table_t *params));
/**
* Find the matched alias for this request and setup for proxy handler
* @param r request
* @param ent proxy_alias record
* @param dconf per-dir config or NULL
* @return OK if the alias matched,
* DONE if the alias matched and r->uri was normalized so
* no further transformation should happen on it,
* DECLINED if proxying is disabled for this alias,
* HTTP_CONTINUE if the alias did not match
*/
PROXY_DECLARE(int) ap_proxy_trans_match(request_rec *r,
struct proxy_alias *ent,
proxy_dir_conf *dconf);
/**
* Create a HTTP request header brigade, old_cl_val and old_te_val as required.
* @param p pool
* @param header_brigade header brigade to use/fill
* @param r request
* @param p_conn proxy connection rec
* @param worker selected worker
* @param conf per-server proxy config
* @param uri uri
* @param url url
* @param server_portstr port as string
* @param old_cl_val stored old content-len val
* @param old_te_val stored old TE val
* @return OK or HTTP_EXPECTATION_FAILED
*/
PROXY_DECLARE(int) ap_proxy_create_hdrbrgd(apr_pool_t *p,
apr_bucket_brigade *header_brigade,
request_rec *r,
proxy_conn_rec *p_conn,
proxy_worker *worker,
proxy_server_conf *conf,
apr_uri_t *uri,
char *url, char *server_portstr,
char **old_cl_val,
char **old_te_val);
/**
* Prefetch the client request body (in memory), up to a limit.
* Read what's in the client pipe. If nonblocking is set and read is EAGAIN,
* pass a FLUSH bucket to the backend and read again in blocking mode.
* @param r client request
* @param backend backend connection
* @param input_brigade input brigade to use/fill
* @param block blocking or non-blocking mode
* @param bytes_read number of bytes read
* @param max_read maximum number of bytes to read
* @return OK or HTTP_* error code
* @note max_read is rounded up to APR_BUCKET_BUFF_SIZE
*/
PROXY_DECLARE(int) ap_proxy_prefetch_input(request_rec *r,
proxy_conn_rec *backend,
apr_bucket_brigade *input_brigade,
apr_read_type_e block,
apr_off_t *bytes_read,
apr_off_t max_read);
/**
* Spool the client request body to memory, or disk above given limit.
* @param r client request
* @param backend backend connection
* @param input_brigade input brigade to use/fill
* @param bytes_spooled number of bytes spooled
* @param max_mem_spool maximum number of in-memory bytes
* @return OK or HTTP_* error code
*/
PROXY_DECLARE(int) ap_proxy_spool_input(request_rec *r,
proxy_conn_rec *backend,
apr_bucket_brigade *input_brigade,
apr_off_t *bytes_spooled,
apr_off_t max_mem_spool);
/**
* Read what's in the client pipe. If the read would block (EAGAIN),
* pass a FLUSH bucket to the backend and read again in blocking mode.
* @param r client request
* @param backend backend connection
* @param input_brigade brigade to use/fill
* @param max_read maximum number of bytes to read
* @return OK or HTTP_* error code
*/
PROXY_DECLARE(int) ap_proxy_read_input(request_rec *r,
proxy_conn_rec *backend,
apr_bucket_brigade *input_brigade,
apr_off_t max_read);
/**
* @param bucket_alloc bucket allocator
* @param r request
* @param p_conn proxy connection
* @param origin connection rec of origin
* @param bb brigade to send to origin
* @param flush flush
* @return status (OK)
*/
PROXY_DECLARE(int) ap_proxy_pass_brigade(apr_bucket_alloc_t *bucket_alloc,
request_rec *r, proxy_conn_rec *p_conn,
conn_rec *origin, apr_bucket_brigade *bb,
int flush);
struct proxy_tunnel_conn; /* opaque */
typedef struct {
request_rec *r;
const char *scheme;
apr_pollset_t *pollset;
apr_array_header_t *pfds;
apr_interval_time_t timeout;
struct proxy_tunnel_conn *client,
*origin;
apr_size_t read_buf_size;
int replied; /* TODO 2.5+: one bit to merge in below bitmask */
unsigned int nohalfclose :1;
} proxy_tunnel_rec;
/**
* Create a tunnel, to be activated by ap_proxy_tunnel_run().
* @param tunnel tunnel created
* @param r client request
* @param c_o connection to origin
* @param scheme caller proxy scheme (connect, ws(s), http(s), ...)
* @return APR_SUCCESS or error status
*/
PROXY_DECLARE(apr_status_t) ap_proxy_tunnel_create(proxy_tunnel_rec **tunnel,
request_rec *r, conn_rec *c_o,
const char *scheme);
/**
* Forward anything from either side of the tunnel to the other,
* until one end aborts or a polling timeout/error occurs.
* @param tunnel tunnel to run
* @return OK if completion is full, HTTP_GATEWAY_TIME_OUT on timeout
* or another HTTP_ error otherwise.
*/
PROXY_DECLARE(int) ap_proxy_tunnel_run(proxy_tunnel_rec *tunnel);
/**
* Clear the headers referenced by the Connection header from the given
* table, and remove the Connection header.
* @param r request
* @param headers table of headers to clear
* @return 1 if "close" was present, 0 otherwise.
*/
APR_DECLARE_OPTIONAL_FN(int, ap_proxy_clear_connection,
(request_rec *r, apr_table_t *headers));
/**
* Do a AJP CPING and wait for CPONG on the socket
*
*/
APR_DECLARE_OPTIONAL_FN(apr_status_t, ajp_handle_cping_cpong,
(apr_socket_t *sock, request_rec *r,
apr_interval_time_t timeout));
/**
* @param socket socket to test
* @return TRUE if socket is connected/active
*/
PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *socket);
#define PROXY_LBMETHOD "proxylbmethod"
/* The number of dynamic workers that can be added when reconfiguring.
* If this limit is reached you must stop and restart the server.
*/
#define PROXY_DYNAMIC_BALANCER_LIMIT 16
/**
* Calculate maximum number of workers in scoreboard.
* @return number of workers to allocate in the scoreboard
*/
int ap_proxy_lb_workers(void);
/**
* Returns 1 if a response with the given status should be overridden.
*
* @param conf proxy directory configuration
* @param code http status code
* @return 1 if code is considered an error-code, 0 otherwise
*/
PROXY_DECLARE(int) ap_proxy_should_override(proxy_dir_conf *conf, int code);
/**
* Return the port number of a known scheme (eg: http -> 80).
* @param scheme scheme to test
* @return port number or 0 if unknown
*/
PROXY_DECLARE(apr_port_t) ap_proxy_port_of_scheme(const char *scheme);
/**
* Return the name of the health check method (eg: "OPTIONS").
* @param method method enum
* @return name of method
*/
PROXY_DECLARE (const char *) ap_proxy_show_hcmethod(hcmethod_t method);
/**
* Strip a unix domain socket (UDS) prefix from the input URL
* @param p pool to allocate result from
* @param url a URL potentially prefixed with a UDS path
* @return URL with the UDS prefix removed
*/
PROXY_DECLARE(const char *) ap_proxy_de_socketfy(apr_pool_t *p, const char *url);
/*
* Transform buckets from one bucket allocator to another one by creating a
* transient bucket for each data bucket and let it use the data read from
* the old bucket. Metabuckets are transformed by just recreating them.
* Attention: Currently only the following bucket types are handled:
*
* All data buckets
* FLUSH
* EOS
*
* If an other bucket type is found its type is logged as a debug message
* and APR_EGENERAL is returned.
*
* @param r request_rec of the actual request. Used for logging purposes
* @param from the bucket brigade to take the buckets from
* @param to the bucket brigade to store the transformed buckets
* @return apr_status_t of the operation. Either APR_SUCCESS or
* APR_EGENERAL
*/
PROXY_DECLARE(apr_status_t) ap_proxy_buckets_lifetime_transform(request_rec *r,
apr_bucket_brigade *from,
apr_bucket_brigade *to);
/*
* The flags for ap_proxy_transfer_between_connections(), where for legacy and
* compatibility reasons FLUSH_EACH and FLUSH_AFTER are boolean values.
*/
#define AP_PROXY_TRANSFER_FLUSH_EACH (0x00)
#define AP_PROXY_TRANSFER_FLUSH_AFTER (0x01)
#define AP_PROXY_TRANSFER_YIELD_PENDING (0x02)
#define AP_PROXY_TRANSFER_YIELD_MAX_READS (0x04)
/*
* Sends all data that can be read non blocking from the input filter chain of
* c_i and send it down the output filter chain of c_o. For reading it uses
* the bucket brigade bb_i which should be created from the bucket allocator
* associated with c_i. For sending through the output filter chain it uses
* the bucket brigade bb_o which should be created from the bucket allocator
* associated with c_o. In order to get the buckets from bb_i to bb_o
* ap_proxy_buckets_lifetime_transform is used.
*
* @param r request_rec of the actual request. Used for logging purposes
* @param c_i inbound connection conn_rec
* @param c_o outbound connection conn_rec
* @param bb_i bucket brigade for pulling data from the inbound connection
* @param bb_o bucket brigade for sending data through the outbound connection
* @param name string for logging from where data was pulled
* @param sent if not NULL will be set to 1 if data was sent through c_o
* @param bsize maximum amount of data pulled in one iteration from c_i
* @param flags AP_PROXY_TRANSFER_* bitmask
* @return apr_status_t of the operation. Could be any error returned from
* either the input filter chain of c_i or the output filter chain
* of c_o, APR_EPIPE if the outgoing connection was aborted, or
* APR_INCOMPLETE if AP_PROXY_TRANSFER_YIELD_PENDING was set and
* the output stack gets full before the input stack is exhausted.
*/
PROXY_DECLARE(apr_status_t) ap_proxy_transfer_between_connections(
request_rec *r,
conn_rec *c_i,
conn_rec *c_o,
apr_bucket_brigade *bb_i,
apr_bucket_brigade *bb_o,
const char *name,
int *sent,
apr_off_t bsize,
int flags);
extern module PROXY_DECLARE_DATA proxy_module;
#endif /*MOD_PROXY_H*/
/** @} */
|