-
Notifications
You must be signed in to change notification settings - Fork 156
/
http_htx.c
2761 lines (2421 loc) · 80.2 KB
/
http_htx.c
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
/*
* Functions to manipulate HTTP messages using the internal representation.
*
* Copyright (C) 2018 HAProxy Technologies, Christopher Faulet <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/cfgparse.h>
#include <haproxy/global.h>
#include <haproxy/h1.h>
#include <haproxy/http.h>
#include <haproxy/http_fetch.h>
#include <haproxy/http_htx.h>
#include <haproxy/htx.h>
#include <haproxy/log.h>
#include <haproxy/regex.h>
#include <haproxy/sample.h>
struct buffer http_err_chunks[HTTP_ERR_SIZE];
struct http_reply http_err_replies[HTTP_ERR_SIZE];
struct eb_root http_error_messages = EB_ROOT;
struct list http_errors_list = LIST_HEAD_INIT(http_errors_list);
struct list http_replies_list = LIST_HEAD_INIT(http_replies_list);
/* The declaration of an errorfiles/errorfile directives. Used during config
* parsing only. */
struct conf_errors {
char type; /* directive type (0: errorfiles, 1: errorfile) */
union {
struct {
int status; /* the status code associated to this error */
struct http_reply *reply; /* the http reply for the errorfile */
} errorfile; /* describe an "errorfile" directive */
struct {
char *name; /* the http-errors section name */
char status[HTTP_ERR_SIZE]; /* list of status to import (0: ignore, 1: implicit import, 2: explicit import) */
} errorfiles; /* describe an "errorfiles" directive */
} info;
char *file; /* file where the directive appears */
int line; /* line where the directive appears */
struct list list; /* next conf_errors */
};
/* Returns the next unporocessed start line in the HTX message. It returns NULL
* if the start-line is undefined (first == -1). Otherwise, it returns the
* pointer on the htx_sl structure.
*/
struct htx_sl *http_get_stline(struct htx *htx)
{
struct htx_blk *blk;
BUG_ON(htx->first == -1);
blk = htx_get_first_blk(htx);
if (!blk)
return NULL;
BUG_ON(htx_get_blk_type(blk) != HTX_BLK_REQ_SL && htx_get_blk_type(blk) != HTX_BLK_RES_SL);
return htx_get_blk_ptr(htx, blk);
}
/* Returns the headers size in the HTX message */
size_t http_get_hdrs_size(struct htx *htx)
{
struct htx_blk *blk;
size_t sz = 0;
blk = htx_get_first_blk(htx);
if (!blk || htx_get_blk_type(blk) > HTX_BLK_EOH)
return sz;
for (; blk; blk = htx_get_next_blk(htx, blk)) {
sz += htx_get_blksz(blk);
if (htx_get_blk_type(blk) == HTX_BLK_EOH)
break;
}
return sz;
}
/* Finds the first or next occurrence of header matching <pattern> in the HTX
* message <htx> using the context <ctx>. This structure holds everything
* necessary to use the header and find next occurrence. If its <blk> member is
* NULL, the header is searched from the beginning. Otherwise, the next
* occurrence is returned. The function returns 1 when it finds a value, and 0
* when there is no more. It is designed to work with headers defined as
* comma-separated lists. If HTTP_FIND_FL_FULL flag is set, it works on
* full-line headers in whose comma is not a delimiter but is part of the
* syntax. A special case, if ctx->value is NULL when searching for a new values
* of a header, the current header is rescanned. This allows rescanning after a
* header deletion.
*
* The matching method is chosen by checking the flags :
*
* * HTTP_FIND_FL_MATCH_REG : <pattern> is a regex. header names matching
* the regex are evaluated.
* * HTTP_FIND_FL_MATCH_STR : <pattern> is a string. The header names equal
* to the string are evaluated.
* * HTTP_FIND_FL_MATCH_PFX : <pattern> is a string. The header names
* starting by the string are evaluated.
* * HTTP_FIND_FL_MATCH_SFX : <pattern> is a string. The header names
* ending by the string are evaluated.
* * HTTP_FIND_FL_MATCH_SUB : <pattern> is a string. The header names
* containing the string are evaluated.
*/
#define HTTP_FIND_FL_MATCH_STR 0x0001
#define HTTP_FIND_FL_MATCH_PFX 0x0002
#define HTTP_FIND_FL_MATCH_SFX 0x0003
#define HTTP_FIND_FL_MATCH_SUB 0x0004
#define HTTP_FIND_FL_MATCH_REG 0x0005
/* 0x0006..0x000f: for other matching methods */
#define HTTP_FIND_FL_MATCH_TYPE 0x000F
#define HTTP_FIND_FL_FULL 0x0010
static int __http_find_header(const struct htx *htx, const void *pattern, struct http_hdr_ctx *ctx, int flags)
{
struct htx_blk *blk = ctx->blk;
struct ist n, v;
enum htx_blk_type type;
if (blk) {
char *p;
if (!isttest(ctx->value))
goto rescan_hdr;
if (flags & HTTP_FIND_FL_FULL)
goto next_blk;
v = htx_get_blk_value(htx, blk);
p = ctx->value.ptr + ctx->value.len + ctx->lws_after;
v.len -= (p - v.ptr);
v.ptr = p;
if (!v.len)
goto next_blk;
/* Skip comma */
if (*(v.ptr) == ',') {
v.ptr++;
v.len--;
}
goto return_hdr;
}
if (htx_is_empty(htx))
return 0;
for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
rescan_hdr:
type = htx_get_blk_type(blk);
if (type == HTX_BLK_EOH || type == HTX_BLK_EOM)
break;
if (type != HTX_BLK_HDR)
continue;
if ((flags & HTTP_FIND_FL_MATCH_TYPE) == HTTP_FIND_FL_MATCH_REG) {
const struct my_regex *re = pattern;
n = htx_get_blk_name(htx, blk);
if (!regex_exec2(re, n.ptr, n.len))
goto next_blk;
}
else {
const struct ist name = *(const struct ist *)(pattern);
/* If no name was passed, we want any header. So skip the comparison */
if (!istlen(name))
goto match;
n = htx_get_blk_name(htx, blk);
switch (flags & HTTP_FIND_FL_MATCH_TYPE) {
case HTTP_FIND_FL_MATCH_STR:
if (!isteqi(n, name))
goto next_blk;
break;
case HTTP_FIND_FL_MATCH_PFX:
if (istlen(n) < istlen(name))
goto next_blk;
n = ist2(istptr(n), istlen(name));
if (!isteqi(n, name))
goto next_blk;
break;
case HTTP_FIND_FL_MATCH_SFX:
if (istlen(n) < istlen(name))
goto next_blk;
n = ist2(istptr(n) + istlen(n) - istlen(name), istlen(name));
if (!isteqi(n, name))
goto next_blk;
break;
case HTTP_FIND_FL_MATCH_SUB:
if (!strnistr(n.ptr, n.len, name.ptr, name.len))
goto next_blk;
break;
default:
goto next_blk;
break;
}
}
match:
v = htx_get_blk_value(htx, blk);
return_hdr:
ctx->lws_before = 0;
ctx->lws_after = 0;
while (v.len && HTTP_IS_LWS(*v.ptr)) {
v.ptr++;
v.len--;
ctx->lws_before++;
}
if (!(flags & HTTP_FIND_FL_FULL))
v.len = http_find_hdr_value_end(v.ptr, v.ptr + v.len) - v.ptr;
while (v.len && HTTP_IS_LWS(*(v.ptr + v.len - 1))) {
v.len--;
ctx->lws_after++;
}
ctx->blk = blk;
ctx->value = v;
return 1;
next_blk:
;
}
ctx->blk = NULL;
ctx->value = ist("");
ctx->lws_before = ctx->lws_after = 0;
return 0;
}
/* Header names must match <name> */
int http_find_header(const struct htx *htx, const struct ist name, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &name, ctx, HTTP_FIND_FL_MATCH_STR | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must match <name>. Same than http_find_header */
int http_find_str_header(const struct htx *htx, const struct ist name, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &name, ctx, HTTP_FIND_FL_MATCH_STR | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must start with <prefix> */
int http_find_pfx_header(const struct htx *htx, const struct ist prefix, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &prefix, ctx, HTTP_FIND_FL_MATCH_PFX | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must end with <suffix> */
int http_find_sfx_header(const struct htx *htx, const struct ist suffix, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &suffix, ctx, HTTP_FIND_FL_MATCH_SFX | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must contain <sub> */
int http_find_sub_header(const struct htx *htx, const struct ist sub, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, &sub, ctx, HTTP_FIND_FL_MATCH_SUB | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Header names must match <re> regex*/
int http_match_header(const struct htx *htx, const struct my_regex *re, struct http_hdr_ctx *ctx, int full)
{
return __http_find_header(htx, re, ctx, HTTP_FIND_FL_MATCH_REG | (full ? HTTP_FIND_FL_FULL : 0));
}
/* Adds a header block int the HTX message <htx>, just before the EOH block. It
* returns 1 on success, otherwise it returns 0.
*/
int http_add_header(struct htx *htx, const struct ist n, const struct ist v)
{
struct htx_blk *blk;
struct htx_sl *sl;
enum htx_blk_type type = htx_get_tail_type(htx);
int32_t prev;
blk = htx_add_header(htx, n, v);
if (!blk)
goto fail;
if (unlikely(type < HTX_BLK_EOH))
goto end;
/* <blk> is the head, swap it iteratively with its predecessor to place
* it just before the end-of-header block. So blocks remains ordered. */
for (prev = htx_get_prev(htx, htx->tail); prev != htx->first; prev = htx_get_prev(htx, prev)) {
struct htx_blk *pblk = htx_get_blk(htx, prev);
enum htx_blk_type type = htx_get_blk_type(pblk);
/* Swap .addr and .info fields */
blk->addr ^= pblk->addr; pblk->addr ^= blk->addr; blk->addr ^= pblk->addr;
blk->info ^= pblk->info; pblk->info ^= blk->info; blk->info ^= pblk->info;
if (blk->addr == pblk->addr)
blk->addr += htx_get_blksz(pblk);
/* Stop when end-of-header is reached */
if (type == HTX_BLK_EOH)
break;
blk = pblk;
}
end:
sl = http_get_stline(htx);
if (sl && (sl->flags & HTX_SL_F_HAS_AUTHORITY) && isteqi(n, ist("host"))) {
if (!http_update_authority(htx, sl, v))
goto fail;
}
return 1;
fail:
return 0;
}
/* Replaces parts of the start-line of the HTX message <htx>. It returns 1 on
* success, otherwise it returns 0.
*/
int http_replace_stline(struct htx *htx, const struct ist p1, const struct ist p2, const struct ist p3)
{
struct htx_blk *blk;
blk = htx_get_first_blk(htx);
if (!blk || !htx_replace_stline(htx, blk, p1, p2, p3))
return 0;
return 1;
}
/* Replace the request method in the HTX message <htx> by <meth>. It returns 1
* on success, otherwise 0.
*/
int http_replace_req_meth(struct htx *htx, const struct ist meth)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist uri, vsn;
if (!sl)
return 0;
/* Start by copying old uri and version */
chunk_memcat(temp, HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl)); /* uri */
uri = ist2(temp->area, HTX_SL_REQ_ULEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + uri.len, HTX_SL_REQ_VLEN(sl));
/* create the new start line */
sl->info.req.meth = find_http_meth(meth.ptr, meth.len);
return http_replace_stline(htx, meth, uri, vsn);
}
/* Replace the request uri in the HTX message <htx> by <uri>. It returns 1 on
* success, otherwise 0.
*/
int http_replace_req_uri(struct htx *htx, const struct ist uri)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist meth, vsn;
if (!sl)
goto fail;
/* Start by copying old method and version */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
/* create the new start line */
if (!http_replace_stline(htx, meth, uri, vsn))
goto fail;
sl = http_get_stline(htx);
if (!http_update_host(htx, sl, uri))
goto fail;
return 1;
fail:
return 0;
}
/* Replace the request path in the HTX message <htx> by <path>. The host part is
* preserverd. if <with_qs> is set, the query string is evaluated as part of the
* path and replaced. Otherwise, it is preserved too. It returns 1 on success,
* otherwise 0.
*/
int http_replace_req_path(struct htx *htx, const struct ist path, int with_qs)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist meth, uri, vsn, p;
size_t plen = 0;
if (!sl)
return 0;
uri = htx_sl_req_uri(sl);
p = http_get_path(uri);
if (!isttest(p))
p = uri;
if (with_qs)
plen = p.len;
else {
while (plen < p.len && *(p.ptr + plen) != '?')
plen++;
}
/* Start by copying old method and version and create the new uri */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
chunk_memcat(temp, uri.ptr, p.ptr - uri.ptr); /* uri: host part */
chunk_memcat(temp, path.ptr, path.len); /* uri: new path */
chunk_memcat(temp, p.ptr + plen, p.len - plen); /* uri: QS part */
uri = ist2(temp->area + meth.len + vsn.len, uri.len - plen + path.len);
/* create the new start line */
return http_replace_stline(htx, meth, uri, vsn);
}
/* Replace the request query-string in the HTX message <htx> by <query>. The
* host part and the path are preserved. It returns 1 on success, otherwise
* 0.
*/
int http_replace_req_query(struct htx *htx, const struct ist query)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist meth, uri, vsn, q;
int offset = 1;
if (!sl)
return 0;
uri = htx_sl_req_uri(sl);
q = uri;
while (q.len > 0 && *(q.ptr) != '?') {
q.ptr++;
q.len--;
}
/* skip the question mark or indicate that we must insert it
* (but only if the format string is not empty then).
*/
if (q.len) {
q.ptr++;
q.len--;
}
else if (query.len > 1)
offset = 0;
/* Start by copying old method and version and create the new uri */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
chunk_memcat(temp, uri.ptr, q.ptr - uri.ptr); /* uri: host + path part */
chunk_memcat(temp, query.ptr + offset, query.len - offset); /* uri: new QS */
uri = ist2(temp->area + meth.len + vsn.len, uri.len - q.len + query.len - offset);
/* create the new start line */
return http_replace_stline(htx, meth, uri, vsn);
}
/* Replace the response status in the HTX message <htx> by <status>. It returns
* 1 on success, otherwise 0.
*/
int http_replace_res_status(struct htx *htx, const struct ist status, const struct ist reason)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist vsn, r;
if (!sl)
return 0;
/* Start by copying old uri and version */
chunk_memcat(temp, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl)); /* vsn */
vsn = ist2(temp->area, HTX_SL_RES_VLEN(sl));
r = reason;
if (!isttest(r)) {
chunk_memcat(temp, HTX_SL_RES_RPTR(sl), HTX_SL_RES_RLEN(sl)); /* reason */
r = ist2(temp->area + vsn.len, HTX_SL_RES_RLEN(sl));
}
/* create the new start line */
sl->info.res.status = strl2ui(status.ptr, status.len);
return http_replace_stline(htx, vsn, status, r);
}
/* Replace the response reason in the HTX message <htx> by <reason>. It returns
* 1 on success, otherwise 0.
*/
int http_replace_res_reason(struct htx *htx, const struct ist reason)
{
struct buffer *temp = get_trash_chunk();
struct htx_sl *sl = http_get_stline(htx);
struct ist vsn, status;
if (!sl)
return 0;
/* Start by copying old uri and version */
chunk_memcat(temp, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl)); /* vsn */
vsn = ist2(temp->area, HTX_SL_RES_VLEN(sl));
chunk_memcat(temp, HTX_SL_RES_CPTR(sl), HTX_SL_RES_CLEN(sl)); /* code */
status = ist2(temp->area + vsn.len, HTX_SL_RES_CLEN(sl));
/* create the new start line */
return http_replace_stline(htx, vsn, status, reason);
}
/* Replaces a part of a header value referenced in the context <ctx> by
* <data>. It returns 1 on success, otherwise it returns 0. The context is
* updated if necessary.
*/
int http_replace_header_value(struct htx *htx, struct http_hdr_ctx *ctx, const struct ist data)
{
struct htx_blk *blk = ctx->blk;
struct htx_sl *sl;
char *start;
struct ist v;
uint32_t len, off;
if (!blk)
goto fail;
v = htx_get_blk_value(htx, blk);
start = ctx->value.ptr - ctx->lws_before;
len = ctx->lws_before + ctx->value.len + ctx->lws_after;
off = start - v.ptr;
blk = htx_replace_blk_value(htx, blk, ist2(start, len), data);
if (!blk)
goto fail;
v = htx_get_blk_value(htx, blk);
sl = http_get_stline(htx);
if (sl && (sl->flags & HTX_SL_F_HAS_AUTHORITY)) {
struct ist n = htx_get_blk_name(htx, blk);
if (isteq(n, ist("host"))) {
if (!http_update_authority(htx, sl, v))
goto fail;
ctx->blk = NULL;
http_find_header(htx, ist("host"), ctx, 1);
blk = ctx->blk;
v = htx_get_blk_value(htx, blk);
}
}
ctx->blk = blk;
ctx->value.ptr = v.ptr + off;
ctx->value.len = data.len;
ctx->lws_before = ctx->lws_after = 0;
return 1;
fail:
return 0;
}
/* Fully replaces a header referenced in the context <ctx> by the name <name>
* with the value <value>. It returns 1 on success, otherwise it returns 0. The
* context is updated if necessary.
*/
int http_replace_header(struct htx *htx, struct http_hdr_ctx *ctx,
const struct ist name, const struct ist value)
{
struct htx_blk *blk = ctx->blk;
struct htx_sl *sl;
if (!blk)
goto fail;
blk = htx_replace_header(htx, blk, name, value);
if (!blk)
goto fail;
sl = http_get_stline(htx);
if (sl && (sl->flags & HTX_SL_F_HAS_AUTHORITY) && isteqi(name, ist("host"))) {
if (!http_update_authority(htx, sl, value))
goto fail;
ctx->blk = NULL;
http_find_header(htx, ist("host"), ctx, 1);
blk = ctx->blk;
}
ctx->blk = blk;
ctx->value = ist(NULL);
ctx->lws_before = ctx->lws_after = 0;
return 1;
fail:
return 0;
}
/* Remove one value of a header. This only works on a <ctx> returned by
* http_find_header function. The value is removed, as well as surrounding commas
* if any. If the removed value was alone, the whole header is removed. The
* <ctx> is always updated accordingly, as well as the HTX message <htx>. It
* returns 1 on success. Otherwise, it returns 0. The <ctx> is always left in a
* form that can be handled by http_find_header() to find next occurrence.
*/
int http_remove_header(struct htx *htx, struct http_hdr_ctx *ctx)
{
struct htx_blk *blk = ctx->blk;
char *start;
struct ist v;
uint32_t len;
if (!blk)
return 0;
start = ctx->value.ptr - ctx->lws_before;
len = ctx->lws_before + ctx->value.len + ctx->lws_after;
v = htx_get_blk_value(htx, blk);
if (len == v.len) {
blk = htx_remove_blk(htx, blk);
if (blk || htx_is_empty(htx)) {
ctx->blk = blk;
ctx->value = IST_NULL;
ctx->lws_before = ctx->lws_after = 0;
}
else {
ctx->blk = htx_get_blk(htx, htx->tail);
ctx->value = htx_get_blk_value(htx, ctx->blk);
ctx->lws_before = ctx->lws_after = 0;
}
return 1;
}
/* This was not the only value of this header. We have to remove the
* part pointed by ctx->value. If it is the last entry of the list, we
* remove the last separator.
*/
if (start == v.ptr) {
/* It's the first header part but not the only one. So remove
* the comma after it. */
len++;
}
else {
/* There is at least one header part before the removed one. So
* remove the comma between them. */
start--;
len++;
}
/* Update the block content and its len */
memmove(start, start+len, v.len-len);
htx_change_blk_value_len(htx, blk, v.len-len);
/* Finally update the ctx */
ctx->value.ptr = start;
ctx->value.len = 0;
ctx->lws_before = ctx->lws_after = 0;
return 1;
}
/* Updates the authority part of the uri with the value <host>. It happens when
* the header host is modified. It returns 0 on failure and 1 on success. It is
* the caller responsibility to provide the start-line and to be sure the uri
* contains an authority. Thus, if no authority is found in the uri, an error is
* returned.
*/
int http_update_authority(struct htx *htx, struct htx_sl *sl, const struct ist host)
{
struct buffer *temp = get_trash_chunk();
struct ist meth, vsn, uri, authority;
uri = htx_sl_req_uri(sl);
authority = http_get_authority(uri, 1);
if (!authority.len)
return 0;
/* Don't update the uri if there is no change */
if (isteq(host, authority))
return 1;
/* Start by copying old method and version */
chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
chunk_memcat(temp, uri.ptr, authority.ptr - uri.ptr);
chunk_memcat(temp, host.ptr, host.len);
chunk_memcat(temp, authority.ptr + authority.len, uri.ptr + uri.len - (authority.ptr + authority.len));
uri = ist2(temp->area + meth.len + vsn.len, host.len + uri.len - authority.len); /* uri */
return http_replace_stline(htx, meth, uri, vsn);
}
/* Update the header host by extracting the authority of the uri <uri>. flags of
* the start-line are also updated accordingly. For orgin-form and asterisk-form
* uri, the header host is not changed and the flag HTX_SL_F_HAS_AUTHORITY is
* removed from the flags of the start-line. Otherwise, this flag is set and the
* authority is used to set the value of the header host. This function returns
* 0 on failure and 1 on success.
*/
int http_update_host(struct htx *htx, struct htx_sl *sl, const struct ist uri)
{
struct ist authority;
struct http_hdr_ctx ctx;
if (!uri.len || uri.ptr[0] == '/' || uri.ptr[0] == '*') {
// origin-form or a asterisk-form (RFC7320 #5.3.1 and #5.3.4)
sl->flags &= ~HTX_SL_F_HAS_AUTHORITY;
}
else {
sl->flags |= HTX_SL_F_HAS_AUTHORITY;
if (sl->info.req.meth != HTTP_METH_CONNECT) {
// absolute-form (RFC7320 #5.3.2)
sl->flags |= HTX_SL_F_HAS_SCHM;
if (uri.len > 4 && (uri.ptr[0] | 0x20) == 'h')
sl->flags |= ((uri.ptr[4] == ':') ? HTX_SL_F_SCHM_HTTP : HTX_SL_F_SCHM_HTTPS);
authority = http_get_authority(uri, 1);
if (!authority.len)
goto fail;
}
else {
// authority-form (RFC7320 #5.3.3)
authority = uri;
}
/* Replace header host value */
ctx.blk = NULL;
while (http_find_header(htx, ist("host"), &ctx, 1)) {
if (!http_replace_header_value(htx, &ctx, authority))
goto fail;
}
}
return 1;
fail:
return 0;
}
/* Return in <vptr> and <vlen> the pointer and length of occurrence <occ> of
* header whose name is <hname> of length <hlen>. If <ctx> is null, lookup is
* performed over the whole headers. Otherwise it must contain a valid header
* context, initialised with ctx->blk=NULL for the first lookup in a series. If
* <occ> is positive or null, occurrence #occ from the beginning (or last ctx)
* is returned. Occ #0 and #1 are equivalent. If <occ> is negative (and no less
* than -MAX_HDR_HISTORY), the occurrence is counted from the last one which is
* -1. The value fetch stops at commas, so this function is suited for use with
* list headers.
* The return value is 0 if nothing was found, or non-zero otherwise.
*/
unsigned int http_get_htx_hdr(const struct htx *htx, const struct ist hdr,
int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen)
{
struct http_hdr_ctx local_ctx;
struct ist val_hist[MAX_HDR_HISTORY];
unsigned int hist_idx;
int found;
if (!ctx) {
local_ctx.blk = NULL;
ctx = &local_ctx;
}
if (occ >= 0) {
/* search from the beginning */
while (http_find_header(htx, hdr, ctx, 0)) {
occ--;
if (occ <= 0) {
*vptr = ctx->value.ptr;
*vlen = ctx->value.len;
return 1;
}
}
return 0;
}
/* negative occurrence, we scan all the list then walk back */
if (-occ > MAX_HDR_HISTORY)
return 0;
found = hist_idx = 0;
while (http_find_header(htx, hdr, ctx, 0)) {
val_hist[hist_idx] = ctx->value;
if (++hist_idx >= MAX_HDR_HISTORY)
hist_idx = 0;
found++;
}
if (-occ > found)
return 0;
/* OK now we have the last occurrence in [hist_idx-1], and we need to
* find occurrence -occ. 0 <= hist_idx < MAX_HDR_HISTORY, and we have
* -10 <= occ <= -1. So we have to check [hist_idx%MAX_HDR_HISTORY+occ]
* to remain in the 0..9 range.
*/
hist_idx += occ + MAX_HDR_HISTORY;
if (hist_idx >= MAX_HDR_HISTORY)
hist_idx -= MAX_HDR_HISTORY;
*vptr = val_hist[hist_idx].ptr;
*vlen = val_hist[hist_idx].len;
return 1;
}
/* Return in <vptr> and <vlen> the pointer and length of occurrence <occ> of
* header whose name is <hname> of length <hlen>. If <ctx> is null, lookup is
* performed over the whole headers. Otherwise it must contain a valid header
* context, initialised with ctx->blk=NULL for the first lookup in a series. If
* <occ> is positive or null, occurrence #occ from the beginning (or last ctx)
* is returned. Occ #0 and #1 are equivalent. If <occ> is negative (and no less
* than -MAX_HDR_HISTORY), the occurrence is counted from the last one which is
* -1. This function differs from http_get_hdr() in that it only returns full
* line header values and does not stop at commas.
* The return value is 0 if nothing was found, or non-zero otherwise.
*/
unsigned int http_get_htx_fhdr(const struct htx *htx, const struct ist hdr,
int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen)
{
struct http_hdr_ctx local_ctx;
struct ist val_hist[MAX_HDR_HISTORY];
unsigned int hist_idx;
int found;
if (!ctx) {
local_ctx.blk = NULL;
ctx = &local_ctx;
}
if (occ >= 0) {
/* search from the beginning */
while (http_find_header(htx, hdr, ctx, 1)) {
occ--;
if (occ <= 0) {
*vptr = ctx->value.ptr;
*vlen = ctx->value.len;
return 1;
}
}
return 0;
}
/* negative occurrence, we scan all the list then walk back */
if (-occ > MAX_HDR_HISTORY)
return 0;
found = hist_idx = 0;
while (http_find_header(htx, hdr, ctx, 1)) {
val_hist[hist_idx] = ctx->value;
if (++hist_idx >= MAX_HDR_HISTORY)
hist_idx = 0;
found++;
}
if (-occ > found)
return 0;
/* OK now we have the last occurrence in [hist_idx-1], and we need to
* find occurrence -occ. 0 <= hist_idx < MAX_HDR_HISTORY, and we have
* -10 <= occ <= -1. So we have to check [hist_idx%MAX_HDR_HISTORY+occ]
* to remain in the 0..9 range.
*/
hist_idx += occ + MAX_HDR_HISTORY;
if (hist_idx >= MAX_HDR_HISTORY)
hist_idx -= MAX_HDR_HISTORY;
*vptr = val_hist[hist_idx].ptr;
*vlen = val_hist[hist_idx].len;
return 1;
}
int http_str_to_htx(struct buffer *buf, struct ist raw, char **errmsg)
{
struct htx *htx;
struct htx_sl *sl;
struct h1m h1m;
struct http_hdr hdrs[global.tune.max_http_hdr];
union h1_sl h1sl;
unsigned int flags = HTX_SL_F_IS_RESP;
int ret = 0;
b_reset(buf);
if (!raw.len) {
buf->size = 0;
buf->area = malloc(raw.len);
return 1;
}
buf->size = global.tune.bufsize;
buf->area = (char *)malloc(buf->size);
if (!buf->area)
goto error;
h1m_init_res(&h1m);
h1m.flags |= H1_MF_NO_PHDR;
ret = h1_headers_to_hdr_list(raw.ptr, raw.ptr + raw.len,
hdrs, sizeof(hdrs)/sizeof(hdrs[0]), &h1m, &h1sl);
if (ret <= 0) {
memprintf(errmsg, "unabled to parse headers (error offset: %d)", h1m.err_pos);
goto error;
}
if (unlikely(h1sl.st.v.len != 8)) {
memprintf(errmsg, "invalid http version (%.*s)", (int)h1sl.st.v.len, h1sl.st.v.ptr);
goto error;
}
if ((*(h1sl.st.v.ptr + 5) > '1') ||
((*(h1sl.st.v.ptr + 5) == '1') && (*(h1sl.st.v.ptr + 7) >= '1')))
h1m.flags |= H1_MF_VER_11;
if (h1sl.st.status < 200 && (h1sl.st.status == 100 || h1sl.st.status >= 102)) {
memprintf(errmsg, "invalid http status code for an error message (%u)",
h1sl.st.status);
goto error;
}
if (h1sl.st.status == 204 || h1sl.st.status == 304) {
/* Responses known to have no body. */
h1m.flags &= ~(H1_MF_CLEN|H1_MF_CHNK);
h1m.flags |= H1_MF_XFER_LEN;
h1m.curr_len = h1m.body_len = 0;
}
else if (h1m.flags & (H1_MF_CLEN|H1_MF_CHNK))
h1m.flags |= H1_MF_XFER_LEN;
if (h1m.flags & H1_MF_VER_11)
flags |= HTX_SL_F_VER_11;
if (h1m.flags & H1_MF_XFER_ENC)
flags |= HTX_SL_F_XFER_ENC;
if (h1m.flags & H1_MF_XFER_LEN) {
flags |= HTX_SL_F_XFER_LEN;
if (h1m.flags & H1_MF_CHNK) {
memprintf(errmsg, "chunk-encoded payload not supported");
goto error;
}
else if (h1m.flags & H1_MF_CLEN) {
flags |= HTX_SL_F_CLEN;
if (h1m.body_len == 0)
flags |= HTX_SL_F_BODYLESS;
}
else
flags |= HTX_SL_F_BODYLESS;
}
if ((flags & HTX_SL_F_BODYLESS) && raw.len > ret) {
memprintf(errmsg, "message payload not expected");
goto error;
}
if ((flags & HTX_SL_F_CLEN) && h1m.body_len != (raw.len - ret)) {
memprintf(errmsg, "payload size does not match the announced content-length (%lu != %lu)",
(unsigned long)(raw.len - ret), (unsigned long)h1m.body_len);
goto error;
}
htx = htx_from_buf(buf);
sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags, h1sl.st.v, h1sl.st.c, h1sl.st.r);
if (!sl || !htx_add_all_headers(htx, hdrs)) {
memprintf(errmsg, "unable to add headers into the HTX message");
goto error;
}
sl->info.res.status = h1sl.st.status;
while (raw.len > ret) {
int sent = htx_add_data(htx, ist2(raw.ptr + ret, raw.len - ret));
if (!sent) {
memprintf(errmsg, "unable to add payload into the HTX message");
goto error;
}
ret += sent;
}
if (!htx_add_endof(htx, HTX_BLK_EOM)) {
memprintf(errmsg, "unable to add EOM into the HTX message");
goto error;
}
return 1;