1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * http_filter.c --- HTTP routines which either filters or deal with filters.
22 #include "apr_strings.h"
23 #include "apr_buckets.h"
25 #include "apr_signal.h"
27 #define APR_WANT_STDIO /* for sscanf */
28 #define APR_WANT_STRFUNC
29 #define APR_WANT_MEMFUNC
33 #include "util_filter.h"
34 #include "ap_config.h"
36 #include "http_config.h"
37 #include "http_core.h"
38 #include "http_protocol.h"
39 #include "http_main.h"
40 #include "http_request.h"
41 #include "http_vhost.h"
42 #include "http_log.h" /* For errors detected in basic auth common
44 #include "apr_date.h" /* For apr_date_parse_http and APR_DATE_BAD */
45 #include "util_charset.h"
46 #include "util_ebcdic.h"
47 #include "util_time.h"
58 #define INVALID_CHAR -2
60 extern module AP_MODULE_DECLARE_DATA http_module;
62 static long get_chunk_size(char *);
64 typedef struct http_filter_ctx {
78 apr_bucket_brigade *bb;
81 static apr_status_t bail_out_on_error(http_ctx_t *ctx,
86 apr_bucket_brigade *bb = ctx->bb;
88 apr_brigade_cleanup(bb);
89 e = ap_bucket_error_create(http_error,
92 APR_BRIGADE_INSERT_TAIL(bb, e);
93 e = apr_bucket_eos_create(f->c->bucket_alloc);
94 APR_BRIGADE_INSERT_TAIL(bb, e);
96 return ap_pass_brigade(f->r->output_filters, bb);
99 static apr_status_t get_remaining_chunk_line(http_ctx_t *ctx,
100 apr_bucket_brigade *b,
104 apr_off_t brigade_length;
110 * As the brigade b should have been requested in mode AP_MODE_GETLINE
111 * all buckets in this brigade are already some type of memory
112 * buckets (due to the needed scanning for LF in mode AP_MODE_GETLINE)
115 rv = apr_brigade_length(b, 0, &brigade_length);
116 if (rv != APR_SUCCESS) {
119 /* Sanity check. Should never happen. See above. */
120 if (brigade_length == -1) {
123 if (!brigade_length) {
126 ctx->linesize += brigade_length;
127 if (ctx->linesize > linelimit) {
131 * As all buckets are already some type of memory buckets or META buckets
132 * (see above), we only need to check the last byte in the last data bucket.
134 for (e = APR_BRIGADE_LAST(b);
135 e != APR_BRIGADE_SENTINEL(b);
136 e = APR_BUCKET_PREV(e)) {
138 if (APR_BUCKET_IS_METADATA(e)) {
141 rv = apr_bucket_read(e, &lineend, &len, APR_BLOCK_READ);
142 if (rv != APR_SUCCESS) {
146 break; /* we got the data we want */
148 /* If we got a zero-length data bucket, we try the next one */
150 /* We had no data in this brigade */
151 if (!len || e == APR_BRIGADE_SENTINEL(b)) {
154 if (lineend[len - 1] != APR_ASCII_LF) {
157 /* Line is complete. So reset ctx->linesize for next round. */
162 static apr_status_t get_chunk_line(http_ctx_t *ctx, apr_bucket_brigade *b,
169 tmp_len = sizeof(ctx->chunk_ln) - (ctx->pos - ctx->chunk_ln) - 1;
170 /* Saveguard ourselves against underflows */
175 len = (apr_size_t) tmp_len;
178 * Check if there is space left in ctx->chunk_ln. If not, then either
179 * the chunk size is insane or we have chunk-extensions. Ignore both
180 * by discarding the remaining part of the line via
181 * get_remaining_chunk_line. Only bail out if the line is too long.
184 rv = apr_brigade_flatten(b, ctx->pos, &len);
185 if (rv != APR_SUCCESS) {
189 ctx->linesize += len;
192 * Check if we really got a full line. If yes the
193 * last char in the just read buffer must be LF.
194 * If not advance the buffer and return APR_EAGAIN.
195 * We do not start processing until we have the
198 if (ctx->pos[-1] != APR_ASCII_LF) {
199 /* Check if the remaining data in the brigade has the LF */
200 return get_remaining_chunk_line(ctx, b, linelimit);
202 /* Line is complete. So reset ctx->pos for next round. */
203 ctx->pos = ctx->chunk_ln;
206 return get_remaining_chunk_line(ctx, b, linelimit);
210 /* This is the HTTP_INPUT filter for HTTP requests and responses from
211 * proxied servers (mod_proxy). It handles chunked and content-length
212 * bodies. This can only be inserted/used after the headers
213 * are successfully parsed.
215 apr_status_t ap_http_filter(ap_filter_t *f, apr_bucket_brigade *b,
216 ap_input_mode_t mode, apr_read_type_e block,
220 http_ctx_t *ctx = f->ctx;
223 int http_error = HTTP_REQUEST_ENTITY_TOO_LARGE;
224 apr_bucket_brigade *bb;
226 /* just get out of the way of things we don't want. */
227 if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE) {
228 return ap_get_brigade(f->next, b, mode, block, readbytes);
232 const char *tenc, *lenp;
233 f->ctx = ctx = apr_pcalloc(f->r->pool, sizeof(*ctx));
234 ctx->state = BODY_NONE;
235 ctx->pos = ctx->chunk_ln;
236 ctx->bb = apr_brigade_create(f->r->pool, f->c->bucket_alloc);
239 /* LimitRequestBody does not apply to proxied responses.
240 * Consider implementing this check in its own filter.
241 * Would adding a directive to limit the size of proxied
242 * responses be useful?
244 if (!f->r->proxyreq) {
245 ctx->limit = ap_get_limit_req_body(f->r);
251 tenc = apr_table_get(f->r->headers_in, "Transfer-Encoding");
252 lenp = apr_table_get(f->r->headers_in, "Content-Length");
255 if (!strcasecmp(tenc, "chunked")) {
256 ctx->state = BODY_CHUNK;
258 /* test lenp, because it gives another case we can handle */
260 /* Something that isn't in HTTP, unless some future
261 * edition defines new transfer ecodings, is unsupported.
263 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, f->r,
264 "Unknown Transfer-Encoding: %s", tenc);
265 return bail_out_on_error(ctx, f, HTTP_NOT_IMPLEMENTED);
268 ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, f->r,
269 "Unknown Transfer-Encoding: %s; using Content-Length", tenc);
276 ctx->state = BODY_LENGTH;
279 /* Protects against over/underflow, non-digit chars in the
280 * string (excluding leading space) (the endstr checks)
281 * and a negative number. */
282 if (apr_strtoff(&ctx->remaining, lenp, &endstr, 10)
283 || endstr == lenp || *endstr || ctx->remaining < 0) {
286 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, f->r,
287 "Invalid Content-Length");
289 return bail_out_on_error(ctx, f, HTTP_REQUEST_ENTITY_TOO_LARGE);
292 /* If we have a limit in effect and we know the C-L ahead of
293 * time, stop it here if it is invalid.
295 if (ctx->limit && ctx->limit < ctx->remaining) {
296 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, f->r,
297 "Requested content-length of %" APR_OFF_T_FMT
298 " is larger than the configured limit"
299 " of %" APR_OFF_T_FMT, ctx->remaining, ctx->limit);
300 return bail_out_on_error(ctx, f, HTTP_REQUEST_ENTITY_TOO_LARGE);
304 /* If we don't have a request entity indicated by the headers, EOS.
305 * (BODY_NONE is a valid intermediate state due to trailers,
306 * but it isn't a valid starting state.)
308 * RFC 2616 Section 4.4 note 5 states that connection-close
309 * is invalid for a request entity - request bodies must be
310 * denoted by C-L or T-E: chunked.
312 * Note that since the proxy uses this filter to handle the
313 * proxied *response*, proxy responses MUST be exempt.
315 if (ctx->state == BODY_NONE && f->r->proxyreq != PROXYREQ_RESPONSE) {
316 e = apr_bucket_eos_create(f->c->bucket_alloc);
317 APR_BRIGADE_INSERT_TAIL(b, e);
322 /* Since we're about to read data, send 100-Continue if needed.
323 * Only valid on chunked and C-L bodies where the C-L is > 0. */
324 if ((ctx->state == BODY_CHUNK ||
325 (ctx->state == BODY_LENGTH && ctx->remaining > 0)) &&
326 f->r->expecting_100 && f->r->proto_num >= HTTP_VERSION(1,1) &&
327 !(f->r->eos_sent || f->r->bytes_sent)) {
328 if (ap_is_HTTP_CLIENT_ERROR(f->r->status)) {
329 ctx->state = BODY_NONE;
334 tmp = apr_pstrcat(f->r->pool, AP_SERVER_PROTOCOL, " ",
335 ap_get_status_line(100), CRLF CRLF, NULL);
336 apr_brigade_cleanup(bb);
337 e = apr_bucket_pool_create(tmp, strlen(tmp), f->r->pool,
339 APR_BRIGADE_INSERT_HEAD(bb, e);
340 e = apr_bucket_flush_create(f->c->bucket_alloc);
341 APR_BRIGADE_INSERT_TAIL(bb, e);
343 ap_pass_brigade(f->c->output_filters, bb);
347 /* We can't read the chunk until after sending 100 if required. */
348 if (ctx->state == BODY_CHUNK) {
349 apr_brigade_cleanup(bb);
351 rv = ap_get_brigade(f->next, bb, AP_MODE_GETLINE,
355 if (block == APR_NONBLOCK_READ &&
356 ( (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb)) ||
357 (APR_STATUS_IS_EAGAIN(rv)) )) {
358 ctx->state = BODY_CHUNK_PART;
362 if (rv == APR_SUCCESS) {
363 rv = get_chunk_line(ctx, bb, f->r->server->limit_req_line);
364 if (APR_STATUS_IS_EAGAIN(rv)) {
365 apr_brigade_cleanup(bb);
366 ctx->state = BODY_CHUNK_PART;
369 if (rv == APR_SUCCESS) {
370 ctx->remaining = get_chunk_size(ctx->chunk_ln);
371 if (ctx->remaining == INVALID_CHAR) {
373 http_error = HTTP_SERVICE_UNAVAILABLE;
377 apr_brigade_cleanup(bb);
379 /* Detect chunksize error (such as overflow) */
380 if (rv != APR_SUCCESS || ctx->remaining < 0) {
381 ctx->remaining = 0; /* Reset it in case we have to
382 * come back here later */
383 return bail_out_on_error(ctx, f, http_error);
386 if (!ctx->remaining) {
387 /* Handle trailers by calling ap_get_mime_headers again! */
388 ctx->state = BODY_NONE;
389 ap_get_mime_headers(f->r);
390 e = apr_bucket_eos_create(f->c->bucket_alloc);
391 APR_BRIGADE_INSERT_TAIL(b, e);
402 e = apr_bucket_eos_create(f->c->bucket_alloc);
403 APR_BRIGADE_INSERT_TAIL(b, e);
407 if (!ctx->remaining) {
408 switch (ctx->state) {
412 e = apr_bucket_eos_create(f->c->bucket_alloc);
413 APR_BRIGADE_INSERT_TAIL(b, e);
417 case BODY_CHUNK_PART:
419 apr_brigade_cleanup(bb);
421 /* We need to read the CRLF after the chunk. */
422 if (ctx->state == BODY_CHUNK) {
423 rv = ap_get_brigade(f->next, bb, AP_MODE_GETLINE,
425 if (block == APR_NONBLOCK_READ &&
426 ( (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb)) ||
427 (APR_STATUS_IS_EAGAIN(rv)) )) {
431 * We really don't care whats on this line. If it is RFC
432 * compliant it should be only \r\n. If there is more
433 * before we just ignore it as long as we do not get over
434 * the limit for request lines.
436 rv = get_remaining_chunk_line(ctx, bb,
437 f->r->server->limit_req_line);
438 apr_brigade_cleanup(bb);
439 if (APR_STATUS_IS_EAGAIN(rv)) {
446 if (rv == APR_SUCCESS) {
447 /* Read the real chunk line. */
448 rv = ap_get_brigade(f->next, bb, AP_MODE_GETLINE,
451 if (block == APR_NONBLOCK_READ &&
452 ( (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb)) ||
453 (APR_STATUS_IS_EAGAIN(rv)) )) {
454 ctx->state = BODY_CHUNK_PART;
457 ctx->state = BODY_CHUNK;
458 if (rv == APR_SUCCESS) {
459 rv = get_chunk_line(ctx, bb, f->r->server->limit_req_line);
460 if (APR_STATUS_IS_EAGAIN(rv)) {
461 ctx->state = BODY_CHUNK_PART;
462 apr_brigade_cleanup(bb);
465 if (rv == APR_SUCCESS) {
466 ctx->remaining = get_chunk_size(ctx->chunk_ln);
467 if (ctx->remaining == INVALID_CHAR) {
469 http_error = HTTP_SERVICE_UNAVAILABLE;
473 apr_brigade_cleanup(bb);
476 /* Detect chunksize error (such as overflow) */
477 if (rv != APR_SUCCESS || ctx->remaining < 0) {
478 ctx->remaining = 0; /* Reset it in case we have to
479 * come back here later */
480 bail_out_on_error(ctx, f, http_error);
484 if (!ctx->remaining) {
485 /* Handle trailers by calling ap_get_mime_headers again! */
486 ctx->state = BODY_NONE;
487 ap_get_mime_headers(f->r);
488 e = apr_bucket_eos_create(f->c->bucket_alloc);
489 APR_BRIGADE_INSERT_TAIL(b, e);
498 /* Ensure that the caller can not go over our boundary point. */
499 if (ctx->state == BODY_LENGTH || ctx->state == BODY_CHUNK) {
500 if (ctx->remaining < readbytes) {
501 readbytes = ctx->remaining;
503 AP_DEBUG_ASSERT(readbytes > 0);
506 rv = ap_get_brigade(f->next, b, mode, block, readbytes);
508 if (rv != APR_SUCCESS) {
512 /* How many bytes did we just read? */
513 apr_brigade_length(b, 0, &totalread);
515 /* If this happens, we have a bucket of unknown length. Die because
516 * it means our assumptions have changed. */
517 AP_DEBUG_ASSERT(totalread >= 0);
519 if (ctx->state != BODY_NONE) {
520 ctx->remaining -= totalread;
523 /* If we have no more bytes remaining on a C-L request,
524 * save the callter a roundtrip to discover EOS.
526 if (ctx->state == BODY_LENGTH && ctx->remaining == 0) {
527 e = apr_bucket_eos_create(f->c->bucket_alloc);
528 APR_BRIGADE_INSERT_TAIL(b, e);
531 /* We have a limit in effect. */
533 /* FIXME: Note that we might get slightly confused on chunked inputs
534 * as we'd need to compensate for the chunk lengths which may not
535 * really count. This seems to be up for interpretation. */
536 ctx->limit_used += totalread;
537 if (ctx->limit < ctx->limit_used) {
538 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, f->r,
539 "Read content-length of %" APR_OFF_T_FMT
540 " is larger than the configured limit"
541 " of %" APR_OFF_T_FMT, ctx->limit_used, ctx->limit);
542 apr_brigade_cleanup(bb);
543 e = ap_bucket_error_create(HTTP_REQUEST_ENTITY_TOO_LARGE, NULL,
546 APR_BRIGADE_INSERT_TAIL(bb, e);
547 e = apr_bucket_eos_create(f->c->bucket_alloc);
548 APR_BRIGADE_INSERT_TAIL(bb, e);
550 return ap_pass_brigade(f->r->output_filters, bb);
558 * Parse a chunk extension, detect overflow.
559 * There are two error cases:
560 * 1) If the conversion would require too many bits, a -1 is returned.
561 * 2) If the conversion used the correct number of bits, but an overflow
562 * caused only the sign bit to flip, then that negative number is
564 * In general, any negative number can be considered an overflow error.
566 static long get_chunk_size(char *b)
569 size_t chunkbits = sizeof(long) * 8;
571 ap_xlate_proto_from_ascii(b, strlen(b));
573 if (!apr_isxdigit(*b)) {
575 * Detect invalid character at beginning. This also works for empty
580 /* Skip leading zeros */
585 while (apr_isxdigit(*b) && (chunkbits > 0)) {
588 if (*b >= '0' && *b <= '9') {
591 else if (*b >= 'A' && *b <= 'F') {
592 xvalue = *b - 'A' + 0xa;
594 else if (*b >= 'a' && *b <= 'f') {
595 xvalue = *b - 'a' + 0xa;
598 chunksize = (chunksize << 4) | xvalue;
602 if (apr_isxdigit(*b) && (chunkbits <= 0)) {
610 typedef struct header_struct {
612 apr_bucket_brigade *bb;
615 /* Send a single HTTP header field to the client. Note that this function
616 * is used in calls to table_do(), so their interfaces are co-dependent.
617 * In other words, don't change this one without checking table_do in alloc.c.
618 * It returns true unless there was a write error of some kind.
620 static int form_header_field(header_struct *h,
621 const char *fieldname, const char *fieldval)
623 #if APR_CHARSET_EBCDIC
630 name_len = strlen(fieldname);
631 val_len = strlen(fieldval);
632 len = name_len + val_len + 4; /* 4 for ": " plus CRLF */
633 headfield = (char *)apr_palloc(h->pool, len + 1);
634 memcpy(headfield, fieldname, name_len);
635 next = headfield + name_len;
638 memcpy(next, fieldval, val_len);
643 ap_xlate_proto_to_ascii(headfield, len);
644 apr_brigade_write(h->bb, NULL, NULL, headfield, len);
647 struct iovec *v = vec;
648 v->iov_base = (void *)fieldname;
649 v->iov_len = strlen(fieldname);
652 v->iov_len = sizeof(": ") - 1;
654 v->iov_base = (void *)fieldval;
655 v->iov_len = strlen(fieldval);
658 v->iov_len = sizeof(CRLF) - 1;
659 apr_brigade_writev(h->bb, NULL, NULL, vec, 4);
660 #endif /* !APR_CHARSET_EBCDIC */
664 /* This routine is called by apr_table_do and merges all instances of
665 * the passed field values into a single array that will be further
666 * processed by some later routine. Originally intended to help split
667 * and recombine multiple Vary fields, though it is generic to any field
668 * consisting of comma/space-separated tokens.
670 static int uniq_field_values(void *d, const char *key, const char *val)
672 apr_array_header_t *values;
678 values = (apr_array_header_t *)d;
680 e = apr_pstrdup(values->pool, val);
683 /* Find a non-empty fieldname */
685 while (*e == ',' || apr_isspace(*e)) {
692 while (*e != '\0' && *e != ',' && !apr_isspace(*e)) {
699 /* Now add it to values if it isn't already represented.
700 * Could be replaced by a ap_array_strcasecmp() if we had one.
702 for (i = 0, strpp = (char **) values->elts; i < values->nelts;
704 if (*strpp && strcasecmp(*strpp, start) == 0) {
708 if (i == values->nelts) { /* if not found */
709 *(char **)apr_array_push(values) = start;
711 } while (*e != '\0');
717 * Since some clients choke violently on multiple Vary fields, or
718 * Vary fields with duplicate tokens, combine any multiples and remove
721 static void fixup_vary(request_rec *r)
723 apr_array_header_t *varies;
725 varies = apr_array_make(r->pool, 5, sizeof(char *));
727 /* Extract all Vary fields from the headers_out, separate each into
728 * its comma-separated fieldname values, and then add them to varies
729 * if not already present in the array.
731 apr_table_do((int (*)(void *, const char *, const char *))uniq_field_values,
732 (void *) varies, r->headers_out, "Vary", NULL);
734 /* If we found any, replace old Vary fields with unique-ified value */
736 if (varies->nelts > 0) {
737 apr_table_setn(r->headers_out, "Vary",
738 apr_array_pstrcat(r->pool, varies, ','));
742 /* Send a request's HTTP response headers to the client.
744 static apr_status_t send_all_header_fields(header_struct *h,
745 const request_rec *r)
747 const apr_array_header_t *elts;
748 const apr_table_entry_t *t_elt;
749 const apr_table_entry_t *t_end;
751 struct iovec *vec_next;
753 elts = apr_table_elts(r->headers_out);
754 if (elts->nelts == 0) {
757 t_elt = (const apr_table_entry_t *)(elts->elts);
758 t_end = t_elt + elts->nelts;
759 vec = (struct iovec *)apr_palloc(h->pool, 4 * elts->nelts *
760 sizeof(struct iovec));
763 /* For each field, generate
764 * name ": " value CRLF
767 vec_next->iov_base = (void*)(t_elt->key);
768 vec_next->iov_len = strlen(t_elt->key);
770 vec_next->iov_base = ": ";
771 vec_next->iov_len = sizeof(": ") - 1;
773 vec_next->iov_base = (void*)(t_elt->val);
774 vec_next->iov_len = strlen(t_elt->val);
776 vec_next->iov_base = CRLF;
777 vec_next->iov_len = sizeof(CRLF) - 1;
780 } while (t_elt < t_end);
782 #if APR_CHARSET_EBCDIC
785 char *tmp = apr_pstrcatv(r->pool, vec, vec_next - vec, &len);
786 ap_xlate_proto_to_ascii(tmp, len);
787 return apr_brigade_write(h->bb, NULL, NULL, tmp, len);
790 return apr_brigade_writev(h->bb, NULL, NULL, vec, vec_next - vec);
794 /* Confirm that the status line is well-formed and matches r->status.
795 * If they don't match, a filter may have negated the status line set by a
797 * Zap r->status_line if bad.
799 static void validate_status_line(request_rec *r)
804 && (strlen(r->status_line) <= 4
805 || apr_strtoi64(r->status_line, &end, 10) != r->status
807 || (end - 3) != r->status_line)) {
808 r->status_line = NULL;
813 * Determine the protocol to use for the response. Potentially downgrade
814 * to HTTP/1.0 in some situations and/or turn off keepalives.
816 * also prepare r->status_line.
818 static void basic_http_header_check(request_rec *r,
819 const char **protocol)
821 if (r->assbackwards) {
822 /* no such thing as a response protocol */
826 validate_status_line(r);
828 if (!r->status_line) {
829 r->status_line = ap_get_status_line(r->status);
832 /* Note that we must downgrade before checking for force responses. */
833 if (r->proto_num > HTTP_VERSION(1,0)
834 && apr_table_get(r->subprocess_env, "downgrade-1.0")) {
835 r->proto_num = HTTP_VERSION(1,0);
838 /* kludge around broken browsers when indicated by force-response-1.0
840 if (r->proto_num == HTTP_VERSION(1,0)
841 && apr_table_get(r->subprocess_env, "force-response-1.0")) {
842 *protocol = "HTTP/1.0";
843 r->connection->keepalive = AP_CONN_CLOSE;
846 *protocol = AP_SERVER_PROTOCOL;
851 /* fill "bb" with a barebones/initial HTTP response header */
852 static void basic_http_header(request_rec *r, apr_bucket_brigade *bb,
853 const char *protocol)
860 if (r->assbackwards) {
861 /* there are no headers to send */
865 /* Output the HTTP/1.x Status-Line and the Date and Server fields */
867 vec[0].iov_base = (void *)protocol;
868 vec[0].iov_len = strlen(protocol);
869 vec[1].iov_base = (void *)" ";
870 vec[1].iov_len = sizeof(" ") - 1;
871 vec[2].iov_base = (void *)(r->status_line);
872 vec[2].iov_len = strlen(r->status_line);
873 vec[3].iov_base = (void *)CRLF;
874 vec[3].iov_len = sizeof(CRLF) - 1;
875 #if APR_CHARSET_EBCDIC
879 tmp = apr_pstrcatv(r->pool, vec, 4, &len);
880 ap_xlate_proto_to_ascii(tmp, len);
881 apr_brigade_write(bb, NULL, NULL, tmp, len);
884 apr_brigade_writev(bb, NULL, NULL, vec, 4);
891 * keep the set-by-proxy server and date headers, otherwise
892 * generate a new server header / date header
894 if (r->proxyreq != PROXYREQ_NONE) {
895 const char *proxy_date;
897 proxy_date = apr_table_get(r->headers_out, "Date");
900 * proxy_date needs to be const. So use date for the creation of
901 * our own Date header and pass it over to proxy_date later to
902 * avoid a compiler warning.
904 date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
905 ap_recent_rfc822_date(date, r->request_time);
908 form_header_field(&h, "Date", proxy_date);
909 server = apr_table_get(r->headers_out, "Server");
911 form_header_field(&h, "Server", server);
913 form_header_field(&h, "Server", ap_get_server_banner());
917 date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
918 ap_recent_rfc822_date(date, r->request_time);
919 form_header_field(&h, "Date", date);
920 form_header_field(&h, "Server", ap_get_server_banner());
923 /* unset so we don't send them again */
924 apr_table_unset(r->headers_out, "Date"); /* Avoid bogosity */
925 apr_table_unset(r->headers_out, "Server");
928 AP_DECLARE(void) ap_basic_http_header(request_rec *r, apr_bucket_brigade *bb)
930 const char *protocol;
932 basic_http_header_check(r, &protocol);
933 basic_http_header(r, bb, protocol);
936 /* Navigator versions 2.x, 3.x and 4.0 betas up to and including 4.0b2
937 * have a header parsing bug. If the terminating \r\n occur starting
938 * at offset 256, 257 or 258 of output then it will not properly parse
939 * the headers. Curiously it doesn't exhibit this problem at 512, 513.
940 * We are guessing that this is because their initial read of a new request
941 * uses a 256 byte buffer, and subsequent reads use a larger buffer.
942 * So the problem might exist at different offsets as well.
944 * This should also work on keepalive connections assuming they use the
945 * same small buffer for the first read of each new request.
947 * At any rate, we check the bytes written so far and, if we are about to
948 * tickle the bug, we instead insert a bogus padding header. Since the bug
949 * manifests as a broken image in Navigator, users blame the server. :(
950 * It is more expensive to check the User-Agent than it is to just add the
951 * bytes, so we haven't used the BrowserMatch feature here.
953 static void terminate_header(apr_bucket_brigade *bb)
955 char tmp[] = "X-Pad: avoid browser bug" CRLF;
960 (void) apr_brigade_length(bb, 1, &len);
962 if (len >= 255 && len <= 257) {
963 buflen = strlen(tmp);
964 ap_xlate_proto_to_ascii(tmp, buflen);
965 apr_brigade_write(bb, NULL, NULL, tmp, buflen);
967 buflen = strlen(crlf);
968 ap_xlate_proto_to_ascii(crlf, buflen);
969 apr_brigade_write(bb, NULL, NULL, crlf, buflen);
972 AP_DECLARE_NONSTD(int) ap_send_http_trace(request_rec *r)
974 core_server_config *conf;
976 apr_bucket_brigade *bb;
980 char *bodyread = NULL, *bodyoff;
981 apr_size_t bodylen = 0;
983 long res = -1; /* init to avoid gcc -Wall warning */
985 if (r->method_number != M_TRACE) {
989 /* Get the original request */
993 conf = (core_server_config *)ap_get_module_config(r->server->module_config,
996 if (conf->trace_enable == AP_TRACE_DISABLE) {
997 apr_table_setn(r->notes, "error-notes",
998 "TRACE denied by server configuration");
999 return HTTP_METHOD_NOT_ALLOWED;
1002 if (conf->trace_enable == AP_TRACE_EXTENDED)
1003 /* XX should be = REQUEST_CHUNKED_PASS */
1004 body = REQUEST_CHUNKED_DECHUNK;
1006 body = REQUEST_NO_BODY;
1008 if ((rv = ap_setup_client_block(r, body))) {
1009 if (rv == HTTP_REQUEST_ENTITY_TOO_LARGE)
1010 apr_table_setn(r->notes, "error-notes",
1011 "TRACE with a request body is not allowed");
1015 if (ap_should_client_block(r)) {
1017 if (r->remaining > 0) {
1018 if (r->remaining > 65536) {
1019 apr_table_setn(r->notes, "error-notes",
1020 "Extended TRACE request bodies cannot exceed 64k\n");
1021 return HTTP_REQUEST_ENTITY_TOO_LARGE;
1023 /* always 32 extra bytes to catch chunk header exceptions */
1024 bodybuf = (apr_size_t)r->remaining + 32;
1027 /* Add an extra 8192 for chunk headers */
1031 bodyoff = bodyread = apr_palloc(r->pool, bodybuf);
1033 /* only while we have enough for a chunked header */
1034 while ((!bodylen || bodybuf >= 32) &&
1035 (res = ap_get_client_block(r, bodyoff, bodybuf)) > 0) {
1040 if (res > 0 && bodybuf < 32) {
1041 /* discard_rest_of_request_body into our buffer */
1042 while (ap_get_client_block(r, bodyread, bodylen) > 0)
1044 apr_table_setn(r->notes, "error-notes",
1045 "Extended TRACE request bodies cannot exceed 64k\n");
1046 return HTTP_REQUEST_ENTITY_TOO_LARGE;
1050 return HTTP_BAD_REQUEST;
1054 ap_set_content_type(r, "message/http");
1056 /* Now we recreate the request, and echo it back */
1058 bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
1059 apr_brigade_putstrs(bb, NULL, NULL, r->the_request, CRLF, NULL);
1062 apr_table_do((int (*) (void *, const char *, const char *))
1063 form_header_field, (void *) &h, r->headers_in, NULL);
1064 apr_brigade_puts(bb, NULL, NULL, CRLF);
1066 /* If configured to accept a body, echo the body */
1068 b = apr_bucket_pool_create(bodyread, bodylen,
1069 r->pool, bb->bucket_alloc);
1070 APR_BRIGADE_INSERT_TAIL(bb, b);
1073 ap_pass_brigade(r->output_filters, bb);
1078 typedef struct header_filter_ctx {
1080 } header_filter_ctx;
1082 AP_CORE_DECLARE_NONSTD(apr_status_t) ap_http_header_filter(ap_filter_t *f,
1083 apr_bucket_brigade *b)
1085 request_rec *r = f->r;
1086 conn_rec *c = r->connection;
1087 const char *clheader;
1088 const char *protocol;
1090 apr_bucket_brigade *b2;
1092 header_filter_ctx *ctx = f->ctx;
1095 AP_DEBUG_ASSERT(!r->main);
1097 if (r->header_only) {
1099 ctx = f->ctx = apr_pcalloc(r->pool, sizeof(header_filter_ctx));
1101 else if (ctx->headers_sent) {
1102 apr_brigade_destroy(b);
1107 for (e = APR_BRIGADE_FIRST(b);
1108 e != APR_BRIGADE_SENTINEL(b);
1109 e = APR_BUCKET_NEXT(e))
1111 if (AP_BUCKET_IS_ERROR(e)) {
1112 ap_bucket_error *eb = e->data;
1114 ap_die(eb->status, r);
1115 return AP_FILTER_ERROR;
1119 if (r->assbackwards) {
1121 ap_remove_output_filter(f);
1122 return ap_pass_brigade(f->next, b);
1126 * Now that we are ready to send a response, we need to combine the two
1127 * header field tables into a single table. If we don't do this, our
1128 * later attempts to set or unset a given fieldname might be bypassed.
1130 if (!apr_is_empty_table(r->err_headers_out)) {
1131 r->headers_out = apr_table_overlay(r->pool, r->err_headers_out,
1136 * Remove the 'Vary' header field if the client can't handle it.
1137 * Since this will have nasty effects on HTTP/1.1 caches, force
1138 * the response into HTTP/1.0 mode.
1140 * Note: the force-response-1.0 should come before the call to
1141 * basic_http_header_check()
1143 if (apr_table_get(r->subprocess_env, "force-no-vary") != NULL) {
1144 apr_table_unset(r->headers_out, "Vary");
1145 r->proto_num = HTTP_VERSION(1,0);
1146 apr_table_set(r->subprocess_env, "force-response-1.0", "1");
1153 * Now remove any ETag response header field if earlier processing
1154 * says so (such as a 'FileETag None' directive).
1156 if (apr_table_get(r->notes, "no-etag") != NULL) {
1157 apr_table_unset(r->headers_out, "ETag");
1160 /* determine the protocol and whether we should use keepalives. */
1161 basic_http_header_check(r, &protocol);
1162 ap_set_keepalive(r);
1165 apr_table_mergen(r->headers_out, "Transfer-Encoding", "chunked");
1166 apr_table_unset(r->headers_out, "Content-Length");
1169 ctype = ap_make_content_type(r, r->content_type);
1170 if (strcasecmp(ctype, NO_CONTENT_TYPE)) {
1171 apr_table_setn(r->headers_out, "Content-Type", ctype);
1174 if (r->content_encoding) {
1175 apr_table_setn(r->headers_out, "Content-Encoding",
1176 r->content_encoding);
1179 if (!apr_is_empty_array(r->content_languages)) {
1182 char **languages = (char **)(r->content_languages->elts);
1183 const char *field = apr_table_get(r->headers_out, "Content-Language");
1185 while (field && (token = ap_get_list_item(r->pool, &field)) != NULL) {
1186 for (i = 0; i < r->content_languages->nelts; ++i) {
1187 if (!strcasecmp(token, languages[i]))
1190 if (i == r->content_languages->nelts) {
1191 *((char **) apr_array_push(r->content_languages)) = token;
1195 field = apr_array_pstrcat(r->pool, r->content_languages, ',');
1196 apr_table_setn(r->headers_out, "Content-Language", field);
1200 * Control cachability for non-cachable responses if not already set by
1201 * some other part of the server configuration.
1203 if (r->no_cache && !apr_table_get(r->headers_out, "Expires")) {
1204 char *date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
1205 ap_recent_rfc822_date(date, r->request_time);
1206 apr_table_addn(r->headers_out, "Expires", date);
1209 /* This is a hack, but I can't find anyway around it. The idea is that
1210 * we don't want to send out 0 Content-Lengths if it is a head request.
1211 * This happens when modules try to outsmart the server, and return
1212 * if they see a HEAD request. Apache 1.3 handlers were supposed to
1213 * just return in that situation, and the core handled the HEAD. In
1214 * 2.0, if a handler returns, then the core sends an EOS bucket down
1215 * the filter stack, and the content-length filter computes a C-L of
1216 * zero and that gets put in the headers, and we end up sending a
1217 * zero C-L to the client. We can't just remove the C-L filter,
1218 * because well behaved 2.0 handlers will send their data down the stack,
1219 * and we will compute a real C-L for the head request. RBB
1222 && (clheader = apr_table_get(r->headers_out, "Content-Length"))
1223 && !strcmp(clheader, "0")) {
1224 apr_table_unset(r->headers_out, "Content-Length");
1227 b2 = apr_brigade_create(r->pool, c->bucket_alloc);
1228 basic_http_header(r, b2, protocol);
1233 if (r->status == HTTP_NOT_MODIFIED) {
1234 apr_table_do((int (*)(void *, const char *, const char *)) form_header_field,
1235 (void *) &h, r->headers_out,
1245 "Proxy-Authenticate",
1251 send_all_header_fields(&h, r);
1254 terminate_header(b2);
1256 ap_pass_brigade(f->next, b2);
1258 if (r->header_only) {
1259 apr_brigade_destroy(b);
1260 ctx->headers_sent = 1;
1264 r->sent_bodyct = 1; /* Whatever follows is real body stuff... */
1267 /* We can't add this filter until we have already sent the headers.
1268 * If we add it before this point, then the headers will be chunked
1269 * as well, and that is just wrong.
1271 ap_add_output_filter("CHUNK", NULL, r, r->connection);
1274 /* Don't remove this filter until after we have added the CHUNK filter.
1275 * Otherwise, f->next won't be the CHUNK filter and thus the first
1276 * brigade won't be chunked properly.
1278 ap_remove_output_filter(f);
1279 return ap_pass_brigade(f->next, b);
1282 /* In HTTP/1.1, any method can have a body. However, most GET handlers
1283 * wouldn't know what to do with a request body if they received one.
1284 * This helper routine tests for and reads any message body in the request,
1285 * simply discarding whatever it receives. We need to do this because
1286 * failing to read the request body would cause it to be interpreted
1287 * as the next request on a persistent connection.
1289 * Since we return an error status if the request is malformed, this
1290 * routine should be called at the beginning of a no-body handler, e.g.,
1292 * if ((retval = ap_discard_request_body(r)) != OK) {
1296 AP_DECLARE(int) ap_discard_request_body(request_rec *r)
1298 apr_bucket_brigade *bb, *kept_body = NULL;
1301 core_dir_conf *dconf;
1304 /* Sometimes we'll get in a state where the input handling has
1305 * detected an error where we want to drop the connection, so if
1306 * that's the case, don't read the data as that is what we're trying
1309 * This function is also a no-op on a subrequest.
1311 if (r->main || r->connection->keepalive == AP_CONN_CLOSE ||
1312 ap_status_drops_connection(r->status)) {
1316 /* We may want to save this body away if the administrator has
1317 * asked us to do so for this directory. This allows the body
1318 * to be reexamined by filters such as mod_include, even though
1319 * the main request has no need for this body.
1321 if (!r->kept_body) {
1322 dconf = ap_get_module_config(r->per_dir_config,
1324 if (dconf->keep_body > 0) {
1325 left = dconf->keep_body;
1326 kept_body = apr_brigade_create(r->pool, r->connection->bucket_alloc);
1330 bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
1335 rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
1336 APR_BLOCK_READ, HUGE_STRING_LEN);
1338 if (rv != APR_SUCCESS) {
1339 /* FIXME: If we ever have a mapping from filters (apr_status_t)
1340 * to HTTP error codes, this would be a good place for them.
1342 * If we received the special case AP_FILTER_ERROR, it means
1343 * that the filters have already handled this error.
1344 * Otherwise, we should assume we have a bad request.
1346 if (rv == AP_FILTER_ERROR) {
1347 apr_brigade_destroy(bb);
1351 apr_brigade_destroy(bb);
1352 return HTTP_BAD_REQUEST;
1356 for (bucket = APR_BRIGADE_FIRST(bb);
1357 bucket != APR_BRIGADE_SENTINEL(bb);
1358 bucket = APR_BUCKET_NEXT(bucket))
1363 if (APR_BUCKET_IS_EOS(bucket)) {
1368 /* These are metadata buckets. */
1369 if (bucket->length == 0) {
1373 /* We MUST read because in case we have an unknown-length
1374 * bucket or one that morphs, we want to exhaust it.
1376 rv = apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ);
1377 if (rv != APR_SUCCESS) {
1378 apr_brigade_destroy(bb);
1379 return HTTP_BAD_REQUEST;
1382 /* If we have been asked to, keep the data up until the
1383 * configured limit. If the limit is exceeded, we return an
1384 * HTTP_REQUEST_ENTITY_TOO_LARGE response so the caller is
1385 * clear the server couldn't handle their request.
1389 apr_bucket_copy(bucket, &e);
1390 APR_BRIGADE_INSERT_TAIL(kept_body, e);
1394 apr_brigade_destroy(bb);
1395 apr_brigade_destroy(kept_body);
1396 return HTTP_REQUEST_ENTITY_TOO_LARGE;
1401 apr_brigade_cleanup(bb);
1402 } while (!seen_eos);
1405 r->kept_body = kept_body;
1411 /* Here we deal with getting the request message body from the client.
1412 * Whether or not the request contains a body is signaled by the presence
1413 * of a non-zero Content-Length or by a Transfer-Encoding: chunked.
1415 * Note that this is more complicated than it was in Apache 1.1 and prior
1416 * versions, because chunked support means that the module does less.
1418 * The proper procedure is this:
1420 * 1. Call ap_setup_client_block() near the beginning of the request
1421 * handler. This will set up all the necessary properties, and will
1422 * return either OK, or an error code. If the latter, the module should
1423 * return that error code. The second parameter selects the policy to
1424 * apply if the request message indicates a body, and how a chunked
1425 * transfer-coding should be interpreted. Choose one of
1427 * REQUEST_NO_BODY Send 413 error if message has any body
1428 * REQUEST_CHUNKED_ERROR Send 411 error if body without Content-Length
1429 * REQUEST_CHUNKED_DECHUNK If chunked, remove the chunks for me.
1430 * REQUEST_CHUNKED_PASS If chunked, pass the chunk headers with body.
1432 * In order to use the last two options, the caller MUST provide a buffer
1433 * large enough to hold a chunk-size line, including any extensions.
1435 * 2. When you are ready to read a body (if any), call ap_should_client_block().
1436 * This will tell the module whether or not to read input. If it is 0,
1437 * the module should assume that there is no message body to read.
1439 * 3. Finally, call ap_get_client_block in a loop. Pass it a buffer and its size.
1440 * It will put data into the buffer (not necessarily a full buffer), and
1441 * return the length of the input block. When it is done reading, it will
1442 * return 0 if EOF, or -1 if there was an error.
1443 * If an error occurs on input, we force an end to keepalive.
1445 * This step also sends a 100 Continue response to HTTP/1.1 clients if appropriate.
1448 AP_DECLARE(int) ap_setup_client_block(request_rec *r, int read_policy)
1450 const char *tenc = apr_table_get(r->headers_in, "Transfer-Encoding");
1451 const char *lenp = apr_table_get(r->headers_in, "Content-Length");
1453 r->read_body = read_policy;
1454 r->read_chunked = 0;
1458 if (strcasecmp(tenc, "chunked")) {
1459 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1460 "Unknown Transfer-Encoding %s", tenc);
1461 return HTTP_NOT_IMPLEMENTED;
1463 if (r->read_body == REQUEST_CHUNKED_ERROR) {
1464 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1465 "chunked Transfer-Encoding forbidden: %s", r->uri);
1466 return (lenp) ? HTTP_BAD_REQUEST : HTTP_LENGTH_REQUIRED;
1469 r->read_chunked = 1;
1474 if (apr_strtoff(&r->remaining, lenp, &endstr, 10)
1475 || *endstr || r->remaining < 0) {
1477 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1478 "Invalid Content-Length");
1479 return HTTP_BAD_REQUEST;
1483 if ((r->read_body == REQUEST_NO_BODY)
1484 && (r->read_chunked || (r->remaining > 0))) {
1485 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
1486 "%s with body is not allowed for %s", r->method, r->uri);
1487 return HTTP_REQUEST_ENTITY_TOO_LARGE;
1492 /* Make sure ap_getline() didn't leave any droppings. */
1493 core_request_config *req_cfg =
1494 (core_request_config *)ap_get_module_config(r->request_config,
1496 AP_DEBUG_ASSERT(APR_BRIGADE_EMPTY(req_cfg->bb));
1503 AP_DECLARE(int) ap_should_client_block(request_rec *r)
1505 /* First check if we have already read the request body */
1507 if (r->read_length || (!r->read_chunked && (r->remaining <= 0))) {
1514 /* get_client_block is called in a loop to get the request message body.
1515 * This is quite simple if the client includes a content-length
1516 * (the normal case), but gets messy if the body is chunked. Note that
1517 * r->remaining is used to maintain state across calls and that
1518 * r->read_length is the total number of bytes given to the caller
1519 * across all invocations. It is messy because we have to be careful not
1520 * to read past the data provided by the client, since these reads block.
1521 * Returns 0 on End-of-body, -1 on error or premature chunk end.
1524 AP_DECLARE(long) ap_get_client_block(request_rec *r, char *buffer,
1528 apr_bucket_brigade *bb;
1530 if (r->remaining < 0 || (!r->read_chunked && r->remaining == 0)) {
1534 bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
1536 r->connection->keepalive = AP_CONN_CLOSE;
1540 rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
1541 APR_BLOCK_READ, bufsiz);
1543 /* We lose the failure code here. This is why ap_get_client_block should
1546 if (rv != APR_SUCCESS) {
1547 /* if we actually fail here, we want to just return and
1548 * stop trying to read data from the client.
1550 r->connection->keepalive = AP_CONN_CLOSE;
1551 apr_brigade_destroy(bb);
1555 /* If this fails, it means that a filter is written incorrectly and that
1556 * it needs to learn how to properly handle APR_BLOCK_READ requests by
1557 * returning data when requested.
1559 AP_DEBUG_ASSERT(!APR_BRIGADE_EMPTY(bb));
1561 /* Check to see if EOS in the brigade.
1563 * If so, we have to leave a nugget for the *next* ap_get_client_block
1566 if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) {
1567 if (r->read_chunked) {
1575 rv = apr_brigade_flatten(bb, buffer, &bufsiz);
1576 if (rv != APR_SUCCESS) {
1577 apr_brigade_destroy(bb);
1582 r->read_length += bufsiz;
1584 apr_brigade_destroy(bb);
1588 /* Filter to handle any error buckets on output */
1589 apr_status_t ap_http_outerror_filter(ap_filter_t *f,
1590 apr_bucket_brigade *b)
1592 request_rec *r = f->r;
1595 for (e = APR_BRIGADE_FIRST(b);
1596 e != APR_BRIGADE_SENTINEL(b);
1597 e = APR_BUCKET_NEXT(e))
1599 if (AP_BUCKET_IS_ERROR(e)) {
1601 * Start of error handling state tree. Just one condition
1604 if (((ap_bucket_error *)(e->data))->status == HTTP_BAD_GATEWAY) {
1605 /* stream aborted and we have not ended it yet */
1606 r->connection->keepalive = AP_CONN_CLOSE;
1611 return ap_pass_brigade(f->next, b);
1614 typedef struct kept_body_filter_ctx {
1616 apr_off_t remaining;
1620 * Initialisation of filter to handle a kept body on subrequests.
1622 * If a body is to be reinserted into a subrequest, any chunking will have
1623 * been removed from the body during storage. We need to change the request
1624 * from Transfer-Encoding: chunked to an explicit Content-Length.
1626 int ap_kept_body_filter_init(ap_filter_t *f) {
1627 apr_off_t length = 0;
1628 request_rec *r = f->r;
1629 apr_bucket_brigade *kept_body = r->kept_body;
1632 apr_table_unset(r->headers_in, "Transfer-Encoding");
1633 apr_brigade_length(kept_body, 1, &length);
1634 apr_table_set(r->headers_in, "Content-Length", apr_off_t_toa(r->pool, length));
1641 * Filter to handle a kept body on subrequests.
1643 * If a body has been previously kept by the request, and if a subrequest wants
1644 * to re-insert the body into the request, this input filter makes it happen.
1646 apr_status_t ap_kept_body_filter(ap_filter_t *f, apr_bucket_brigade *b,
1647 ap_input_mode_t mode, apr_read_type_e block,
1648 apr_off_t readbytes) {
1649 request_rec *r = f->r;
1650 apr_bucket_brigade *kept_body = r->kept_body;
1651 kept_body_ctx_t *ctx = f->ctx;
1652 apr_bucket *ec, *e2;
1655 /* just get out of the way of things we don't want. */
1656 if (!kept_body || (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE)) {
1657 return ap_get_brigade(f->next, b, mode, block, readbytes);
1660 /* set up the context if it does not already exist */
1662 f->ctx = ctx = apr_palloc(f->r->pool, sizeof(*ctx));
1664 apr_brigade_length(kept_body, 1, &ctx->remaining);
1667 /* kept_body is finished, send next filter */
1668 if (ctx->remaining <= 0) {
1669 return ap_get_brigade(f->next, b, mode, block, readbytes);
1672 /* send all of the kept_body, but no more */
1673 if (readbytes > ctx->remaining) {
1674 readbytes = ctx->remaining;
1677 /* send part of the kept_body */
1678 if ((rv = apr_brigade_partition(kept_body, ctx->offset, &ec)) != APR_SUCCESS) {
1679 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
1680 "apr_brigade_partition() failed on kept_body at %" APR_OFF_T_FMT, ctx->offset);
1683 if ((rv = apr_brigade_partition(kept_body, ctx->offset + readbytes, &e2)) != APR_SUCCESS) {
1684 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
1685 "apr_brigade_partition() failed on kept_body at %" APR_OFF_T_FMT, ctx->offset + readbytes);
1694 if (apr_bucket_copy(ec, &foo) != APR_SUCCESS) {
1695 /* As above; this should not fail since the bucket has
1696 * a known length, but just to be sure, this takes
1697 * care of uncopyable buckets that do somehow manage
1698 * to slip through. */
1699 /* XXX: check for failure? */
1700 apr_bucket_read(ec, &str, &len, APR_BLOCK_READ);
1701 apr_bucket_copy(ec, &foo);
1703 APR_BRIGADE_INSERT_TAIL(b, foo);
1704 ec = APR_BUCKET_NEXT(ec);
1707 ctx->remaining -= readbytes;
1708 ctx->offset += readbytes;