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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* byterange_filter.c --- HTTP byterange filter and friends.
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#include "apr_strings.h"
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#include "apr_buckets.h"
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#include "apr_signal.h"
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#define APR_WANT_STDIO /* for sscanf */
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#define APR_WANT_STRFUNC
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#define APR_WANT_MEMFUNC
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#include "util_filter.h"
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#include "ap_config.h"
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#include "http_config.h"
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#include "http_core.h"
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#include "http_protocol.h"
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#include "http_main.h"
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#include "http_request.h"
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#include "http_vhost.h"
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#include "http_log.h" /* For errors detected in basic auth common
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#include "apr_date.h" /* For apr_date_parse_http and APR_DATE_BAD */
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#include "util_charset.h"
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#include "util_ebcdic.h"
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#include "util_time.h"
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static int parse_byterange(char *range, apr_off_t clength,
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apr_off_t *start, apr_off_t *end)
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char *dash = strchr(range, '-');
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if ((dash == range)) {
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/* In the form "-5" */
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if (apr_strtoff(&number, dash+1, &errp, 10) || *errp) {
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*start = clength - number;
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if (apr_strtoff(&number, range, &errp, 10) || *errp) {
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if (apr_strtoff(&number, dash, &errp, 10) || *errp) {
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if (*end >= clength) {
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return (*start > 0 || *end < clength);
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static int ap_set_byterange(request_rec *r);
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typedef struct byterange_ctx {
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apr_bucket_brigade *bb;
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* Here we try to be compatible with clients that want multipart/x-byteranges
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* instead of multipart/byteranges (also see above), as per HTTP/1.1. We
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* look for the Request-Range header (e.g. Netscape 2 and 3) as an indication
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* that the browser supports an older protocol. We also check User-Agent
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* for Microsoft Internet Explorer 3, which needs this as well.
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static int use_range_x(request_rec *r)
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return (apr_table_get(r->headers_in, "Request-Range")
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|| ((ua = apr_table_get(r->headers_in, "User-Agent"))
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&& ap_strstr_c(ua, "MSIE 3")));
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#define BYTERANGE_FMT "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT "/%" APR_OFF_T_FMT
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#define PARTITION_ERR_FMT "apr_brigade_partition() failed " \
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"[%" APR_OFF_T_FMT ",%" APR_OFF_T_FMT "]"
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AP_CORE_DECLARE_NONSTD(apr_status_t) ap_byterange_filter(ap_filter_t *f,
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apr_bucket_brigade *bb)
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#define MIN_LENGTH(len1, len2) ((len1 > len2) ? len2 : len1)
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request_rec *r = f->r;
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conn_rec *c = r->connection;
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apr_bucket_brigade *bsend;
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apr_off_t range_start;
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apr_off_t clength = 0;
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/* Iterate through the brigade until reaching EOS or a bucket with
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for (e = APR_BRIGADE_FIRST(bb);
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(e != APR_BRIGADE_SENTINEL(bb) && !APR_BUCKET_IS_EOS(e)
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&& e->length != (apr_size_t)-1);
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e = APR_BUCKET_NEXT(e)) {
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clength += e->length;
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/* Don't attempt to do byte range work if this brigade doesn't
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* contain an EOS, or if any of the buckets has an unknown length;
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* this avoids the cases where it is expensive to perform
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* byteranging (i.e. may require arbitrary amounts of memory). */
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if (!APR_BUCKET_IS_EOS(e) || clength <= 0) {
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ap_remove_output_filter(f);
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return ap_pass_brigade(f->next, bb);
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num_ranges = ap_set_byterange(r);
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/* We have nothing to do, get out of the way. */
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if (num_ranges == 0) {
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ap_remove_output_filter(f);
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return ap_pass_brigade(f->next, bb);
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ctx = apr_pcalloc(r->pool, sizeof(*ctx));
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ctx->num_ranges = num_ranges;
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/* create a brigade in case we never call ap_save_brigade() */
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ctx->bb = apr_brigade_create(r->pool, c->bucket_alloc);
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if (ctx->num_ranges > 1) {
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/* Is ap_make_content_type required here? */
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const char *orig_ct = ap_make_content_type(r, r->content_type);
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ctx->boundary = apr_psprintf(r->pool, "%" APR_UINT64_T_HEX_FMT "%lx",
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(apr_uint64_t)r->request_time, (long) getpid());
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ap_set_content_type(r, apr_pstrcat(r->pool, "multipart",
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use_range_x(r) ? "/x-" : "/",
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"byteranges; boundary=",
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ctx->boundary, NULL));
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ctx->bound_head = apr_pstrcat(r->pool,
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CRLF "--", ctx->boundary,
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CRLF "Content-type: ",
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CRLF "Content-range: bytes ",
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ap_xlate_proto_to_ascii(ctx->bound_head, strlen(ctx->bound_head));
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/* this brigade holds what we will be sending */
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bsend = apr_brigade_create(r->pool, c->bucket_alloc);
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while ((current = ap_getword(r->pool, &r->range, ','))
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&& (rv = parse_byterange(current, clength, &range_start,
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/* These calls to apr_brigage_partition should only fail in
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* pathological cases, e.g. a file being truncated whilst
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if ((rv = apr_brigade_partition(bb, range_start, &ec)) != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
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PARTITION_ERR_FMT, range_start, clength);
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if ((rv = apr_brigade_partition(bb, range_end+1, &e2)) != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
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PARTITION_ERR_FMT, range_end+1, clength);
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/* For single range requests, we must produce Content-Range header.
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* Otherwise, we need to produce the multipart boundaries.
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if (ctx->num_ranges == 1) {
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apr_table_setn(r->headers_out, "Content-Range",
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apr_psprintf(r->pool, "bytes " BYTERANGE_FMT,
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range_start, range_end, clength));
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e = apr_bucket_pool_create(ctx->bound_head, strlen(ctx->bound_head),
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r->pool, c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bsend, e);
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ts = apr_psprintf(r->pool, BYTERANGE_FMT CRLF CRLF,
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range_start, range_end, clength);
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ap_xlate_proto_to_ascii(ts, strlen(ts));
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e = apr_bucket_pool_create(ts, strlen(ts), r->pool,
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APR_BRIGADE_INSERT_TAIL(bsend, e);
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if (apr_bucket_copy(ec, &foo) != APR_SUCCESS) {
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/* As above; this should not fail since the bucket has
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* a known length, but just to be sure, this takes
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* care of uncopyable buckets that do somehow manage
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* to slip through. */
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/* XXX: check for failure? */
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apr_bucket_read(ec, &str, &len, APR_BLOCK_READ);
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apr_bucket_copy(ec, &foo);
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APR_BRIGADE_INSERT_TAIL(bsend, foo);
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ec = APR_BUCKET_NEXT(ec);
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ap_remove_output_filter(f);
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/* bsend is assumed to be empty if we get here. */
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e = ap_bucket_error_create(HTTP_RANGE_NOT_SATISFIABLE, NULL,
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r->pool, c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bsend, e);
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e = apr_bucket_eos_create(c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bsend, e);
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return ap_pass_brigade(f->next, bsend);
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if (ctx->num_ranges > 1) {
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/* add the final boundary */
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end = apr_pstrcat(r->pool, CRLF "--", ctx->boundary, "--" CRLF, NULL);
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ap_xlate_proto_to_ascii(end, strlen(end));
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e = apr_bucket_pool_create(end, strlen(end), r->pool, c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bsend, e);
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e = apr_bucket_eos_create(c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(bsend, e);
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/* we're done with the original content - all of our data is in bsend. */
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apr_brigade_destroy(bb);
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/* send our multipart output */
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return ap_pass_brigade(f->next, bsend);
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static int ap_set_byterange(request_rec *r)
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const char *if_range;
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if (r->assbackwards) {
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/* Check for Range request-header (HTTP/1.1) or Request-Range for
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* backwards-compatibility with second-draft Luotonen/Franks
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* byte-ranges (e.g. Netscape Navigator 2-3).
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* We support this form, with Request-Range, and (farther down) we
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* send multipart/x-byteranges instead of multipart/byteranges for
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* Request-Range based requests to work around a bug in Netscape
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* Navigator 2-3 and MSIE 3.
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if (!(range = apr_table_get(r->headers_in, "Range"))) {
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range = apr_table_get(r->headers_in, "Request-Range");
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if (!range || strncasecmp(range, "bytes=", 6) || r->status != HTTP_OK) {
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/* is content already a single range? */
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if (apr_table_get(r->headers_out, "Content-Range")) {
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/* is content already a multiple range? */
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if ((ct = apr_table_get(r->headers_out, "Content-Type"))
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&& (!strncasecmp(ct, "multipart/byteranges", 20)
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|| !strncasecmp(ct, "multipart/x-byteranges", 22))) {
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/* Check the If-Range header for Etag or Date.
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* Note that this check will return false (as required) if either
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* of the two etags are weak.
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if ((if_range = apr_table_get(r->headers_in, "If-Range"))) {
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if (if_range[0] == '"') {
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if (!(match = apr_table_get(r->headers_out, "Etag"))
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|| (strcmp(if_range, match) != 0)) {
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else if (!(match = apr_table_get(r->headers_out, "Last-Modified"))
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|| (strcmp(if_range, match) != 0)) {
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if (!ap_strchr_c(range, ',')) {
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/* a multiple range */
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r->status = HTTP_PARTIAL_CONTENT;
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r->range = range + 6;