blob: 58629785cb8383fb05b4c1d66760438b9230ba8e [file] [log] [blame]
Christopher Faulet47596d32018-10-22 09:17:28 +02001/*
2 * Functions to manipulate HTTP messages using the internal representation.
3 *
4 * Copyright (C) 2018 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <common/config.h>
Christopher Fauleta7b677c2018-11-29 16:48:49 +010014#include <common/cfgparse.h>
Christopher Faulet47596d32018-10-22 09:17:28 +020015#include <common/http.h>
16
Christopher Fauleta7b677c2018-11-29 16:48:49 +010017#include <proto/h1.h>
Christopher Faulet47596d32018-10-22 09:17:28 +020018#include <proto/http_htx.h>
19#include <proto/htx.h>
20
Christopher Fauleta7b677c2018-11-29 16:48:49 +010021struct buffer htx_err_chunks[HTTP_ERR_SIZE];
22
Christopher Faulet47596d32018-10-22 09:17:28 +020023/* Finds the start line in the HTX message stopping at the first
Christopher Fauletf1ba18d2018-11-26 21:37:08 +010024 * end-of-message. It returns NULL when not found, otherwise, it returns the
25 * pointer on the htx_sl structure. The HTX message may be updated if the
26 * start-line is returned following a lookup.
Christopher Faulet47596d32018-10-22 09:17:28 +020027 */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +010028struct htx_sl *http_find_stline(struct htx *htx)
Christopher Faulet47596d32018-10-22 09:17:28 +020029{
Christopher Fauletf1ba18d2018-11-26 21:37:08 +010030 struct htx_sl *sl = NULL;
Christopher Faulet47596d32018-10-22 09:17:28 +020031 int32_t pos;
32
Christopher Fauletf1ba18d2018-11-26 21:37:08 +010033 sl = htx_get_stline(htx);
34 if (sl)
35 return sl;
36
Christopher Faulet47596d32018-10-22 09:17:28 +020037 for (pos = htx_get_head(htx); pos != -1; pos = htx_get_next(htx, pos)) {
38 struct htx_blk *blk = htx_get_blk(htx, pos);
39 enum htx_blk_type type = htx_get_blk_type(blk);
40
Christopher Fauletf1ba18d2018-11-26 21:37:08 +010041 if (type == HTX_BLK_REQ_SL || type == HTX_BLK_RES_SL) {
42 sl = htx_get_blk_ptr(htx, blk);
43 htx->sl_off = blk->addr;
44 break;
Christopher Faulet47596d32018-10-22 09:17:28 +020045 }
Christopher Faulet573fe732018-11-28 16:55:12 +010046
47 if (type == HTX_BLK_EOH || type == HTX_BLK_EOM)
Christopher Faulet47596d32018-10-22 09:17:28 +020048 break;
49 }
50
Christopher Faulet47596d32018-10-22 09:17:28 +020051 return sl;
52}
53
54/* Finds the first or next occurrence of header <name> in the HTX message <htx>
55 * using the context <ctx>. This structure holds everything necessary to use the
56 * header and find next occurrence. If its <blk> member is NULL, the header is
57 * searched from the beginning. Otherwise, the next occurrence is returned. The
58 * function returns 1 when it finds a value, and 0 when there is no more. It is
59 * designed to work with headers defined as comma-separated lists. If <full> is
60 * set, it works on full-line headers in whose comma is not a delimiter but is
61 * part of the syntax. A special case, if ctx->value is NULL when searching for
62 * a new values of a header, the current header is rescanned. This allows
63 * rescanning after a header deletion.
64 */
65int http_find_header(const struct htx *htx, const struct ist name,
66 struct http_hdr_ctx *ctx, int full)
67{
68 struct htx_blk *blk = ctx->blk;
69 struct ist n, v;
70 enum htx_blk_type type;
71 uint32_t pos;
72
73 if (blk) {
74 char *p;
75
76 pos = htx_get_blk_pos(htx, blk);
77 if (!ctx->value.ptr)
78 goto rescan_hdr;
79 if (full)
80 goto next_blk;
81 v = htx_get_blk_value(htx, blk);
82 p = ctx->value.ptr + ctx->value.len + ctx->lws_after;
83 v.len -= (p - v.ptr);
84 v.ptr = p;
85 if (!v.len)
86 goto next_blk;
87 /* Skip comma */
88 if (*(v.ptr) == ',') {
89 v.ptr++;
90 v.len--;
91 }
92
93 goto return_hdr;
94 }
95
96 if (!htx->used)
97 return 0;
98
99 pos = htx_get_head(htx);
100 while (1) {
101 rescan_hdr:
102 blk = htx_get_blk(htx, pos);
103 type = htx_get_blk_type(blk);
Christopher Faulet573fe732018-11-28 16:55:12 +0100104 if (type == HTX_BLK_EOH || type == HTX_BLK_EOM)
105 break;
Christopher Faulet47596d32018-10-22 09:17:28 +0200106 if (type != HTX_BLK_HDR)
107 goto next_blk;
108 if (name.len) {
109 /* If no name was passed, we want any header. So skip the comparison */
110 n = htx_get_blk_name(htx, blk);
111 if (!isteqi(n, name))
112 goto next_blk;
113 }
114 v = htx_get_blk_value(htx, blk);
115
116 return_hdr:
117 ctx->lws_before = 0;
118 ctx->lws_after = 0;
119 while (v.len && HTTP_IS_LWS(*v.ptr)) {
120 v.ptr++;
121 v.len--;
122 ctx->lws_before++;
123 }
124 if (!full)
125 v.len = http_find_hdr_value_end(v.ptr, v.ptr + v.len) - v.ptr;
126 while (v.len && HTTP_IS_LWS(*(v.ptr + v.len - 1))) {
127 v.len--;
128 ctx->lws_after++;
129 }
130 if (!v.len)
131 goto next_blk;
132 ctx->blk = blk;
133 ctx->value = v;
134 return 1;
135
136 next_blk:
137 if (pos == htx->tail)
138 break;
139 pos++;
140 if (pos >= htx->wrap)
141 pos = 0;
142 }
143
144 ctx->blk = NULL;
145 ctx->value = ist("");
146 ctx->lws_before = ctx->lws_after = 0;
147 return 0;
148}
149
150/* Adds a header block int the HTX message <htx>, just before the EOH block. It
151 * returns 1 on success, otherwise it returns 0.
152 */
153int http_add_header(struct htx *htx, const struct ist n, const struct ist v)
154{
155 struct htx_blk *blk;
156 enum htx_blk_type type = htx_get_tail_type(htx);
157 int32_t prev;
158
159 blk = htx_add_header(htx, n, v);
160 if (!blk)
161 return 0;
162
163 if (unlikely(type < HTX_BLK_EOH))
164 return 1;
165
166 /* <blk> is the head, swap it iteratively with its predecessor to place
167 * it just before the end-of-header block. So blocks remains ordered. */
168 for (prev = htx_get_prev(htx, htx->tail); prev != -1; prev = htx_get_prev(htx, prev)) {
169 struct htx_blk *pblk = htx_get_blk(htx, prev);
170 enum htx_blk_type type = htx_get_blk_type(pblk);
171
172 /* Swap .addr and .info fields */
173 blk->addr ^= pblk->addr; pblk->addr ^= blk->addr; blk->addr ^= pblk->addr;
174 blk->info ^= pblk->info; pblk->info ^= blk->info; blk->info ^= pblk->info;
175
176 if (blk->addr == pblk->addr)
177 blk->addr += htx_get_blksz(pblk);
178 htx->front = prev;
179
180 /* Stop when end-of-header is reached */
181 if (type == HTX_BLK_EOH)
182 break;
183
184 blk = pblk;
185 }
186 return 1;
187}
188
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100189/* Replaces parts of the start-line of the HTX message <htx>. It returns 1 on
190 * success, otherwise it returns 0. The right block is search in the HTX
Christopher Faulet47596d32018-10-22 09:17:28 +0200191 * message.
192 */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100193int http_replace_stline(struct htx *htx, const struct ist p1, const struct ist p2, const struct ist p3)
Christopher Faulet47596d32018-10-22 09:17:28 +0200194{
195 int32_t pos;
196
197 for (pos = htx_get_head(htx); pos != -1; pos = htx_get_next(htx, pos)) {
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100198 struct htx_blk *blk = htx_get_blk(htx, pos);
199 enum htx_blk_type type = htx_get_blk_type(blk);
Christopher Faulet47596d32018-10-22 09:17:28 +0200200
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100201 if (htx->sl_off == blk->addr) {
202 if (!htx_replace_stline(htx, blk, p1, p2, p3))
Christopher Faulet47596d32018-10-22 09:17:28 +0200203 return 0;
204 return 1;
205 }
Christopher Faulet47596d32018-10-22 09:17:28 +0200206
Christopher Faulet47596d32018-10-22 09:17:28 +0200207 if (type == HTX_BLK_EOM)
208 break;
209 }
210
211 return 0;
212}
213
Christopher Faulete010c802018-10-24 10:36:45 +0200214/* Replace the request method in the HTX message <htx> by <meth>. It returns 1
215 * on success, otherwise 0.
216 */
217int http_replace_req_meth(struct htx *htx, const struct ist meth)
218{
219 struct buffer *temp = get_trash_chunk();
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100220 struct htx_sl *sl = http_find_stline(htx);
221 struct ist uri, vsn;
Christopher Faulete010c802018-10-24 10:36:45 +0200222
223 /* Start by copying old uri and version */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100224 chunk_memcat(temp, HTX_SL_REQ_UPTR(sl), HTX_SL_REQ_ULEN(sl)); /* uri */
225 uri = ist2(temp->area, HTX_SL_REQ_ULEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200226
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100227 chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
228 vsn = ist2(temp->area + uri.len, HTX_SL_REQ_VLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200229
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100230 /* create the new start line */
231 sl->info.req.meth = find_http_meth(meth.ptr, meth.len);
232 return http_replace_stline(htx, meth, uri, vsn);
Christopher Faulete010c802018-10-24 10:36:45 +0200233}
234
235/* Replace the request uri in the HTX message <htx> by <uri>. It returns 1 on
236 * success, otherwise 0.
237 */
238int http_replace_req_uri(struct htx *htx, const struct ist uri)
239{
240 struct buffer *temp = get_trash_chunk();
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100241 struct htx_sl *sl = http_find_stline(htx);
242 struct ist meth, vsn;
Christopher Faulete010c802018-10-24 10:36:45 +0200243
244 /* Start by copying old method and version */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100245 chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
246 meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200247
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100248 chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
249 vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200250
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100251 /* create the new start line */
252 return http_replace_stline(htx, meth, uri, vsn);
Christopher Faulete010c802018-10-24 10:36:45 +0200253}
254
255/* Replace the request path in the HTX message <htx> by <path>. The host part
256 * and the query string are preserved. It returns 1 on success, otherwise 0.
257 */
258int http_replace_req_path(struct htx *htx, const struct ist path)
259{
260 struct buffer *temp = get_trash_chunk();
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100261 struct htx_sl *sl = http_find_stline(htx);
262 struct ist meth, uri, vsn, p;
Christopher Faulete010c802018-10-24 10:36:45 +0200263 size_t plen = 0;
264
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100265 uri = htx_sl_req_uri(sl);
266 p = http_get_path(uri);
Christopher Faulete010c802018-10-24 10:36:45 +0200267 if (!p.ptr)
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100268 p = uri;
Christopher Faulete010c802018-10-24 10:36:45 +0200269 while (plen < p.len && *(p.ptr + plen) != '?')
270 plen++;
271
272 /* Start by copying old method and version and create the new uri */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100273 chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
274 meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200275
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100276 chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
277 vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
278
279 chunk_memcat(temp, uri.ptr, p.ptr - uri.ptr); /* uri: host part */
Christopher Faulete010c802018-10-24 10:36:45 +0200280 chunk_memcat(temp, path.ptr, path.len); /* uri: new path */
281 chunk_memcat(temp, p.ptr + plen, p.len - plen); /* uri: QS part */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100282 uri = ist2(temp->area + meth.len + vsn.len, uri.len - plen + path.len);
Christopher Faulete010c802018-10-24 10:36:45 +0200283
284 /* create the new start line */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100285 return http_replace_stline(htx, meth, uri, vsn);
Christopher Faulete010c802018-10-24 10:36:45 +0200286}
287
288/* Replace the request query-string in the HTX message <htx> by <query>. The
289 * host part and the path are preserved. It returns 1 on success, otherwise
290 * 0.
291 */
292int http_replace_req_query(struct htx *htx, const struct ist query)
293{
294 struct buffer *temp = get_trash_chunk();
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100295 struct htx_sl *sl = http_find_stline(htx);
296 struct ist meth, uri, vsn, q;
Christopher Faulete010c802018-10-24 10:36:45 +0200297 int offset = 1;
298
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100299 uri = htx_sl_req_uri(sl);
300 q = uri;
Christopher Faulete010c802018-10-24 10:36:45 +0200301 while (q.len > 0 && *(q.ptr) != '?') {
302 q.ptr++;
303 q.len--;
304 }
305
306 /* skip the question mark or indicate that we must insert it
307 * (but only if the format string is not empty then).
308 */
309 if (q.len) {
310 q.ptr++;
311 q.len--;
312 }
313 else if (query.len > 1)
314 offset = 0;
315
316 /* Start by copying old method and version and create the new uri */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100317 chunk_memcat(temp, HTX_SL_REQ_MPTR(sl), HTX_SL_REQ_MLEN(sl)); /* meth */
318 meth = ist2(temp->area, HTX_SL_REQ_MLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200319
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100320 chunk_memcat(temp, HTX_SL_REQ_VPTR(sl), HTX_SL_REQ_VLEN(sl)); /* vsn */
321 vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200322
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100323 chunk_memcat(temp, uri.ptr, q.ptr - uri.ptr); /* uri: host + path part */
324 chunk_memcat(temp, query.ptr + offset, query.len - offset); /* uri: new QS */
325 uri = ist2(temp->area + meth.len + vsn.len, uri.len - q.len + query.len - offset);
Christopher Faulete010c802018-10-24 10:36:45 +0200326
327 /* create the new start line */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100328 return http_replace_stline(htx, meth, uri, vsn);
Christopher Faulete010c802018-10-24 10:36:45 +0200329}
330
331/* Replace the response status in the HTX message <htx> by <status>. It returns
332 * 1 on success, otherwise 0.
333*/
334int http_replace_res_status(struct htx *htx, const struct ist status)
335{
336 struct buffer *temp = get_trash_chunk();
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100337 struct htx_sl *sl = http_find_stline(htx);
338 struct ist vsn, reason;
Christopher Faulete010c802018-10-24 10:36:45 +0200339
340 /* Start by copying old uri and version */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100341 chunk_memcat(temp, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl)); /* vsn */
342 vsn = ist2(temp->area, HTX_SL_RES_VLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200343
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100344 chunk_memcat(temp, HTX_SL_RES_RPTR(sl), HTX_SL_RES_RLEN(sl)); /* reason */
345 reason = ist2(temp->area + vsn.len, HTX_SL_RES_RLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200346
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100347 /* create the new start line */
348 sl->info.res.status = strl2ui(status.ptr, status.len);
349 return http_replace_stline(htx, vsn, status, reason);
Christopher Faulete010c802018-10-24 10:36:45 +0200350}
351
352/* Replace the response reason in the HTX message <htx> by <reason>. It returns
353 * 1 on success, otherwise 0.
354*/
355int http_replace_res_reason(struct htx *htx, const struct ist reason)
356{
357 struct buffer *temp = get_trash_chunk();
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100358 struct htx_sl *sl = http_find_stline(htx);
359 struct ist vsn, status;
Christopher Faulete010c802018-10-24 10:36:45 +0200360
361 /* Start by copying old uri and version */
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100362 chunk_memcat(temp, HTX_SL_RES_VPTR(sl), HTX_SL_RES_VLEN(sl)); /* vsn */
363 vsn = ist2(temp->area, HTX_SL_RES_VLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200364
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100365 chunk_memcat(temp, HTX_SL_RES_CPTR(sl), HTX_SL_RES_CLEN(sl)); /* code */
366 status = ist2(temp->area + vsn.len, HTX_SL_RES_CLEN(sl));
Christopher Faulete010c802018-10-24 10:36:45 +0200367
Christopher Fauletf1ba18d2018-11-26 21:37:08 +0100368 /* create the new start line */
369 return http_replace_stline(htx, vsn, status, reason);
Christopher Faulete010c802018-10-24 10:36:45 +0200370}
371
Christopher Faulet47596d32018-10-22 09:17:28 +0200372/* Replaces a part of a header value referenced in the context <ctx> by
373 * <data>. It returns 1 on success, otherwise it returns 0. The context is
374 * updated if necessary.
375 */
376int http_replace_header_value(struct htx *htx, struct http_hdr_ctx *ctx, const struct ist data)
377{
378 struct htx_blk *blk = ctx->blk;
379 char *start;
380 struct ist v;
381 uint32_t len, off;
382
383 if (!blk)
384 return 0;
385
386 v = htx_get_blk_value(htx, blk);
387 start = ctx->value.ptr - ctx->lws_before;
388 len = ctx->lws_before + ctx->value.len + ctx->lws_after;
389 off = start - v.ptr;
390
391 blk = htx_replace_blk_value(htx, blk, ist2(start, len), data);
392 if (!blk)
393 return 0;
394
395 v = htx_get_blk_value(htx, blk);
396 ctx->blk = blk;
397 ctx->value.ptr = v.ptr + off;
398 ctx->value.len = data.len;
399 ctx->lws_before = ctx->lws_after = 0;
400
401 return 1;
402}
403
404/* Fully replaces a header referenced in the context <ctx> by the name <name>
405 * with the value <value>. It returns 1 on success, otherwise it returns 0. The
406 * context is updated if necessary.
407 */
408int http_replace_header(struct htx *htx, struct http_hdr_ctx *ctx,
409 const struct ist name, const struct ist value)
410{
411 struct htx_blk *blk = ctx->blk;
412
413 if (!blk)
414 return 0;
415
416 blk = htx_replace_header(htx, blk, name, value);
417 if (!blk)
418 return 0;
419
420 ctx->blk = blk;
421 ctx->value = ist(NULL);
422 ctx->lws_before = ctx->lws_after = 0;
423
424 return 1;
425}
426
427/* Remove one value of a header. This only works on a <ctx> returned by
428 * http_find_header function. The value is removed, as well as surrounding commas
429 * if any. If the removed value was alone, the whole header is removed. The
430 * <ctx> is always updated accordingly, as well as the HTX message <htx>. It
431 * returns 1 on success. Otherwise, it returns 0. The <ctx> is always left in a
432 * form that can be handled by http_find_header() to find next occurrence.
433 */
434int http_remove_header(struct htx *htx, struct http_hdr_ctx *ctx)
435{
436 struct htx_blk *blk = ctx->blk;
437 char *start;
438 struct ist v;
439 uint32_t len;
440
441 if (!blk)
442 return 0;
443
444 start = ctx->value.ptr - ctx->lws_before;
445 len = ctx->lws_before + ctx->value.len + ctx->lws_after;
446
447 v = htx_get_blk_value(htx, blk);
448 if (len == v.len) {
449 blk = htx_remove_blk(htx, blk);
450 if (blk || !htx->used) {
451 ctx->blk = blk;
452 ctx->value = ist2(NULL, 0);
453 ctx->lws_before = ctx->lws_after = 0;
454 }
455 else {
456 ctx->blk = htx_get_blk(htx, htx->tail);
457 ctx->value = htx_get_blk_value(htx, ctx->blk);
458 ctx->lws_before = ctx->lws_after = 0;
459 }
460 return 1;
461 }
462
463 /* This was not the only value of this header. We have to remove the
464 * part pointed by ctx->value. If it is the last entry of the list, we
465 * remove the last separator.
466 */
467 if (start == v.ptr) {
468 /* It's the first header part but not the only one. So remove
469 * the comma after it. */
470 len++;
471 }
472 else {
473 /* There is at least one header part before the removed one. So
474 * remove the comma between them. */
475 start--;
476 len++;
477 }
478 /* Update the block content and its len */
479 memmove(start, start+len, v.len-len);
480 htx_set_blk_value_len(blk, v.len-len);
481
482 /* Update HTX msg */
483 htx->data -= len;
484
485 /* Finally update the ctx */
486 ctx->value.ptr = start;
487 ctx->value.len = 0;
488 ctx->lws_before = ctx->lws_after = 0;
489
490 return 1;
491}
Christopher Faulet7ff1cea2018-10-24 10:39:35 +0200492
493
494/* Return in <vptr> and <vlen> the pointer and length of occurrence <occ> of
495 * header whose name is <hname> of length <hlen>. If <ctx> is null, lookup is
496 * performed over the whole headers. Otherwise it must contain a valid header
497 * context, initialised with ctx->blk=NULL for the first lookup in a series. If
498 * <occ> is positive or null, occurrence #occ from the beginning (or last ctx)
499 * is returned. Occ #0 and #1 are equivalent. If <occ> is negative (and no less
500 * than -MAX_HDR_HISTORY), the occurrence is counted from the last one which is
501 * -1. The value fetch stops at commas, so this function is suited for use with
502 * list headers.
503 * The return value is 0 if nothing was found, or non-zero otherwise.
504 */
505unsigned int http_get_htx_hdr(const struct htx *htx, const struct ist hdr,
506 int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen)
507{
508 struct http_hdr_ctx local_ctx;
509 struct ist val_hist[MAX_HDR_HISTORY];
510 unsigned int hist_idx;
511 int found;
512
513 if (!ctx) {
514 local_ctx.blk = NULL;
515 ctx = &local_ctx;
516 }
517
518 if (occ >= 0) {
519 /* search from the beginning */
520 while (http_find_header(htx, hdr, ctx, 0)) {
521 occ--;
522 if (occ <= 0) {
523 *vptr = ctx->value.ptr;
524 *vlen = ctx->value.len;
525 return 1;
526 }
527 }
528 return 0;
529 }
530
531 /* negative occurrence, we scan all the list then walk back */
532 if (-occ > MAX_HDR_HISTORY)
533 return 0;
534
535 found = hist_idx = 0;
536 while (http_find_header(htx, hdr, ctx, 0)) {
537 val_hist[hist_idx] = ctx->value;
538 if (++hist_idx >= MAX_HDR_HISTORY)
539 hist_idx = 0;
540 found++;
541 }
542 if (-occ > found)
543 return 0;
544
545 /* OK now we have the last occurrence in [hist_idx-1], and we need to
546 * find occurrence -occ. 0 <= hist_idx < MAX_HDR_HISTORY, and we have
547 * -10 <= occ <= -1. So we have to check [hist_idx%MAX_HDR_HISTORY+occ]
548 * to remain in the 0..9 range.
549 */
550 hist_idx += occ + MAX_HDR_HISTORY;
551 if (hist_idx >= MAX_HDR_HISTORY)
552 hist_idx -= MAX_HDR_HISTORY;
553 *vptr = val_hist[hist_idx].ptr;
554 *vlen = val_hist[hist_idx].len;
555 return 1;
556}
557
558/* Return in <vptr> and <vlen> the pointer and length of occurrence <occ> of
559 * header whose name is <hname> of length <hlen>. If <ctx> is null, lookup is
560 * performed over the whole headers. Otherwise it must contain a valid header
561 * context, initialised with ctx->blk=NULL for the first lookup in a series. If
562 * <occ> is positive or null, occurrence #occ from the beginning (or last ctx)
563 * is returned. Occ #0 and #1 are equivalent. If <occ> is negative (and no less
564 * than -MAX_HDR_HISTORY), the occurrence is counted from the last one which is
565 * -1. This function differs from http_get_hdr() in that it only returns full
566 * line header values and does not stop at commas.
567 * The return value is 0 if nothing was found, or non-zero otherwise.
568 */
569unsigned int http_get_htx_fhdr(const struct htx *htx, const struct ist hdr,
570 int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen)
571{
572 struct http_hdr_ctx local_ctx;
573 struct ist val_hist[MAX_HDR_HISTORY];
574 unsigned int hist_idx;
575 int found;
576
577 if (!ctx) {
578 local_ctx.blk = NULL;
579 ctx = &local_ctx;
580 }
581
582 if (occ >= 0) {
583 /* search from the beginning */
584 while (http_find_header(htx, hdr, ctx, 1)) {
585 occ--;
586 if (occ <= 0) {
587 *vptr = ctx->value.ptr;
588 *vlen = ctx->value.len;
589 return 1;
590 }
591 }
592 return 0;
593 }
594
595 /* negative occurrence, we scan all the list then walk back */
596 if (-occ > MAX_HDR_HISTORY)
597 return 0;
598
599 found = hist_idx = 0;
600 while (http_find_header(htx, hdr, ctx, 1)) {
601 val_hist[hist_idx] = ctx->value;
602 if (++hist_idx >= MAX_HDR_HISTORY)
603 hist_idx = 0;
604 found++;
605 }
606 if (-occ > found)
607 return 0;
608
609 /* OK now we have the last occurrence in [hist_idx-1], and we need to
610 * find occurrence -occ. 0 <= hist_idx < MAX_HDR_HISTORY, and we have
611 * -10 <= occ <= -1. So we have to check [hist_idx%MAX_HDR_HISTORY+occ]
612 * to remain in the 0..9 range.
613 */
614 hist_idx += occ + MAX_HDR_HISTORY;
615 if (hist_idx >= MAX_HDR_HISTORY)
616 hist_idx -= MAX_HDR_HISTORY;
617 *vptr = val_hist[hist_idx].ptr;
618 *vlen = val_hist[hist_idx].len;
619 return 1;
620}
Christopher Fauleta7b677c2018-11-29 16:48:49 +0100621
622static struct htx *http_str_to_htx(struct buffer *buf, struct ist raw)
623{
624 struct htx *htx;
625 struct htx_sl *sl;
626 struct h1m h1m;
627 struct http_hdr hdrs[MAX_HTTP_HDR];
628 union h1_sl h1sl;
629 unsigned int flags = HTX_SL_F_IS_RESP;
630 int ret = 0;
631
632 buf->size = global.tune.bufsize;
633 buf->area = (char *)malloc(buf->size);
634 if (!buf->area)
635 goto error;
636 b_reset(buf);
637
638 h1m_init_res(&h1m);
639 h1m.flags |= H1_MF_NO_PHDR;
640 ret = h1_headers_to_hdr_list(raw.ptr, raw.ptr + raw.len,
641 hdrs, sizeof(hdrs)/sizeof(hdrs[0]), &h1m, &h1sl);
642 if (ret <= 0)
643 goto error;
644
645 if (unlikely(h1sl.st.v.len != 8))
646 goto error;
647 if ((*(h1sl.st.v.ptr + 5) > '1') ||
648 ((*(h1sl.st.v.ptr + 5) == '1') && (*(h1sl.st.v.ptr + 7) >= '1')))
649 h1m.flags |= H1_MF_VER_11;
650
651 if (h1m.flags & H1_MF_VER_11)
652 flags |= HTX_SL_F_VER_11;
653 if (h1m.flags & H1_MF_XFER_ENC)
654 flags |= HTX_SL_F_XFER_ENC;
655 if (h1m.flags & H1_MF_XFER_LEN) {
656 flags |= HTX_SL_F_XFER_LEN;
657 if (h1m.flags & H1_MF_CHNK)
658 goto error; /* Unsupported because there is no body parsing */
659 else if (h1m.flags & H1_MF_CLEN) {
660 flags |= HTX_SL_F_CLEN;
661 if (h1m.body_len == 0)
662 flags |= HTX_SL_F_BODYLESS;
663 }
664 }
665
666 htx = htx_from_buf(buf);
667 sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags, h1sl.st.v, h1sl.st.c, h1sl.st.r);
668 if (!sl || !htx_add_all_headers(htx, hdrs))
669 goto error;
670 sl->info.res.status = h1sl.st.status;
671
672 if (raw.len > ret) {
673 if (!htx_add_data(htx, ist2(raw.ptr + ret, raw.len - ret)))
674 goto error;
675 }
676 if (!htx_add_endof(htx, HTX_BLK_EOM))
677 goto error;
678
679 b_set_data(buf, b_size(buf));
680 return htx;
681
682error:
683 if (buf->size)
684 free(buf->area);
685 return NULL;
686}
687
688static int http_htx_init(void)
689{
690 struct proxy *px;
691 struct buffer chk;
692 struct ist raw;
693 int rc;
694 int err_code = 0;
695
696 for (px = proxies_list; px; px = px->next) {
697 if (!(px->options2 & PR_O2_USE_HTX))
698 continue;
699
700 for (rc = 0; rc < HTTP_ERR_SIZE; rc++) {
701 if (!b_data(&px->errmsg[rc]))
702 continue;
703
704 raw = ist2(b_head(&px->errmsg[rc]), b_data(&px->errmsg[rc]));
705 if (!http_str_to_htx(&chk, raw)) {
706 ha_alert("config: %s '%s': Unable to convert message in HTX for HTTP return code %d.\n",
707 proxy_type_str(px), px->id, http_err_codes[rc]);
708 err_code |= ERR_ALERT | ERR_FATAL;
709 }
710 chunk_destroy(&px->errmsg[rc]);
711 px->errmsg[rc] = chk;
712 }
713 }
714
715 for (rc = 0; rc < HTTP_ERR_SIZE; rc++) {
716 if (!http_err_msgs[rc]) {
717 ha_alert("Internal error: no message defined for HTTP return code %d", rc);
718 err_code |= ERR_ALERT | ERR_FATAL;
719 continue;
720 }
721
722 raw = ist2(http_err_msgs[rc], strlen(http_err_msgs[rc]));
723 if (!http_str_to_htx(&chk, raw)) {
724 ha_alert("Internal error: Unable to convert message in HTX for HTTP return code %d.\n",
725 http_err_codes[rc]);
726 err_code |= ERR_ALERT | ERR_FATAL;
727 }
728 htx_err_chunks[rc] = chk;
729 }
730end:
731 return err_code;
732}
733
734REGISTER_CONFIG_POSTPARSER("http_htx", http_htx_init);