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 * byterange_filter.c --- HTTP byterange filter and friends.
23 #if APR_HAVE_PROCESS_H
24 #include <process.h> /* for getpid() on Win32 */
27 #include "apr_strings.h"
28 #include "apr_buckets.h"
30 #include "apr_signal.h"
32 #define APR_WANT_STDIO /* for sscanf */
33 #define APR_WANT_STRFUNC
34 #define APR_WANT_MEMFUNC
37 #include "util_filter.h"
38 #include "ap_config.h"
40 #include "http_config.h"
41 #include "http_core.h"
42 #include "http_protocol.h"
43 #include "http_main.h"
44 #include "http_request.h"
45 #include "http_vhost.h"
46 #include "http_log.h" /* For errors detected in basic auth common
48 #include "apr_date.h" /* For apr_date_parse_http and APR_DATE_BAD */
49 #include "util_charset.h"
50 #include "util_ebcdic.h"
51 #include "util_time.h"
62 APLOG_USE_MODULE(http);
64 static int parse_byterange(char *range, apr_off_t clength,
65 apr_off_t *start, apr_off_t *end)
67 char *dash = strchr(range, '-');
76 /* In the form "-5" */
77 if (apr_strtoff(&number, dash+1, &errp, 10) || *errp) {
80 *start = clength - number;
85 if (apr_strtoff(&number, range, &errp, 10) || *errp) {
90 if (apr_strtoff(&number, dash, &errp, 10) || *errp) {
104 if (*end >= clength) {
112 return (*start > 0 || *end < clength);
115 static int ap_set_byterange(request_rec *r);
117 typedef struct byterange_ctx {
118 apr_bucket_brigade *bb;
125 * Here we try to be compatible with clients that want multipart/x-byteranges
126 * instead of multipart/byteranges (also see above), as per HTTP/1.1. We
127 * look for the Request-Range header (e.g. Netscape 2 and 3) as an indication
128 * that the browser supports an older protocol. We also check User-Agent
129 * for Microsoft Internet Explorer 3, which needs this as well.
131 static int use_range_x(request_rec *r)
134 return (apr_table_get(r->headers_in, "Request-Range")
135 || ((ua = apr_table_get(r->headers_in, "User-Agent"))
136 && ap_strstr_c(ua, "MSIE 3")));
139 #define BYTERANGE_FMT "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT "/%" APR_OFF_T_FMT
140 #define PARTITION_ERR_FMT "apr_brigade_partition() failed " \
141 "[%" APR_OFF_T_FMT ",%" APR_OFF_T_FMT "]"
143 AP_CORE_DECLARE_NONSTD(apr_status_t) ap_byterange_filter(ap_filter_t *f,
144 apr_bucket_brigade *bb)
146 #define MIN_LENGTH(len1, len2) ((len1 > len2) ? len2 : len1)
147 request_rec *r = f->r;
148 conn_rec *c = r->connection;
151 apr_bucket_brigade *bsend;
152 apr_off_t range_start;
155 apr_off_t clength = 0;
160 /* Iterate through the brigade until reaching EOS or a bucket with
162 for (e = APR_BRIGADE_FIRST(bb);
163 (e != APR_BRIGADE_SENTINEL(bb) && !APR_BUCKET_IS_EOS(e)
164 && e->length != (apr_size_t)-1);
165 e = APR_BUCKET_NEXT(e)) {
166 clength += e->length;
169 /* Don't attempt to do byte range work if this brigade doesn't
170 * contain an EOS, or if any of the buckets has an unknown length;
171 * this avoids the cases where it is expensive to perform
172 * byteranging (i.e. may require arbitrary amounts of memory). */
173 if (!APR_BUCKET_IS_EOS(e) || clength <= 0) {
174 ap_remove_output_filter(f);
175 return ap_pass_brigade(f->next, bb);
178 num_ranges = ap_set_byterange(r);
180 /* We have nothing to do, get out of the way. */
181 if (num_ranges == 0) {
182 ap_remove_output_filter(f);
183 return ap_pass_brigade(f->next, bb);
186 ctx = apr_pcalloc(r->pool, sizeof(*ctx));
187 ctx->num_ranges = num_ranges;
188 /* create a brigade in case we never call ap_save_brigade() */
189 ctx->bb = apr_brigade_create(r->pool, c->bucket_alloc);
191 if (ctx->num_ranges > 1) {
192 /* Is ap_make_content_type required here? */
193 const char *orig_ct = ap_make_content_type(r, r->content_type);
194 ctx->boundary = apr_psprintf(r->pool, "%" APR_UINT64_T_HEX_FMT "%lx",
195 (apr_uint64_t)r->request_time, (long) getpid());
197 ap_set_content_type(r, apr_pstrcat(r->pool, "multipart",
198 use_range_x(r) ? "/x-" : "/",
199 "byteranges; boundary=",
200 ctx->boundary, NULL));
203 ctx->bound_head = apr_pstrcat(r->pool,
204 CRLF "--", ctx->boundary,
205 CRLF "Content-type: ",
207 CRLF "Content-range: bytes ",
211 /* if we have no type for the content, do our best */
212 ctx->bound_head = apr_pstrcat(r->pool,
213 CRLF "--", ctx->boundary,
214 CRLF "Content-range: bytes ",
217 ap_xlate_proto_to_ascii(ctx->bound_head, strlen(ctx->bound_head));
220 /* this brigade holds what we will be sending */
221 bsend = apr_brigade_create(r->pool, c->bucket_alloc);
223 while ((current = ap_getword(r->pool, &r->range, ','))
224 && (rv = parse_byterange(current, clength, &range_start,
233 /* These calls to apr_brigage_partition should only fail in
234 * pathological cases, e.g. a file being truncated whilst
236 if ((rv = apr_brigade_partition(bb, range_start, &ec)) != APR_SUCCESS) {
237 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
238 PARTITION_ERR_FMT, range_start, clength);
241 if ((rv = apr_brigade_partition(bb, range_end+1, &e2)) != APR_SUCCESS) {
242 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
243 PARTITION_ERR_FMT, range_end+1, clength);
249 /* For single range requests, we must produce Content-Range header.
250 * Otherwise, we need to produce the multipart boundaries.
252 if (ctx->num_ranges == 1) {
253 apr_table_setn(r->headers_out, "Content-Range",
254 apr_psprintf(r->pool, "bytes " BYTERANGE_FMT,
255 range_start, range_end, clength));
260 e = apr_bucket_pool_create(ctx->bound_head, strlen(ctx->bound_head),
261 r->pool, c->bucket_alloc);
262 APR_BRIGADE_INSERT_TAIL(bsend, e);
264 ts = apr_psprintf(r->pool, BYTERANGE_FMT CRLF CRLF,
265 range_start, range_end, clength);
266 ap_xlate_proto_to_ascii(ts, strlen(ts));
267 e = apr_bucket_pool_create(ts, strlen(ts), r->pool,
269 APR_BRIGADE_INSERT_TAIL(bsend, e);
277 if (apr_bucket_copy(ec, &foo) != APR_SUCCESS) {
278 /* As above; this should not fail since the bucket has
279 * a known length, but just to be sure, this takes
280 * care of uncopyable buckets that do somehow manage
281 * to slip through. */
282 /* XXX: check for failure? */
283 apr_bucket_read(ec, &str, &len, APR_BLOCK_READ);
284 apr_bucket_copy(ec, &foo);
286 APR_BRIGADE_INSERT_TAIL(bsend, foo);
287 ec = APR_BUCKET_NEXT(ec);
292 ap_remove_output_filter(f);
294 /* bsend is assumed to be empty if we get here. */
295 e = ap_bucket_error_create(HTTP_RANGE_NOT_SATISFIABLE, NULL,
296 r->pool, c->bucket_alloc);
297 APR_BRIGADE_INSERT_TAIL(bsend, e);
298 e = apr_bucket_eos_create(c->bucket_alloc);
299 APR_BRIGADE_INSERT_TAIL(bsend, e);
300 return ap_pass_brigade(f->next, bsend);
303 if (ctx->num_ranges > 1) {
306 /* add the final boundary */
307 end = apr_pstrcat(r->pool, CRLF "--", ctx->boundary, "--" CRLF, NULL);
308 ap_xlate_proto_to_ascii(end, strlen(end));
309 e = apr_bucket_pool_create(end, strlen(end), r->pool, c->bucket_alloc);
310 APR_BRIGADE_INSERT_TAIL(bsend, e);
313 e = apr_bucket_eos_create(c->bucket_alloc);
314 APR_BRIGADE_INSERT_TAIL(bsend, e);
316 /* we're done with the original content - all of our data is in bsend. */
317 apr_brigade_cleanup(bb);
319 /* send our multipart output */
320 return ap_pass_brigade(f->next, bsend);
323 static int ap_set_byterange(request_rec *r)
326 const char *if_range;
331 if (r->assbackwards) {
335 /* Check for Range request-header (HTTP/1.1) or Request-Range for
336 * backwards-compatibility with second-draft Luotonen/Franks
337 * byte-ranges (e.g. Netscape Navigator 2-3).
339 * We support this form, with Request-Range, and (farther down) we
340 * send multipart/x-byteranges instead of multipart/byteranges for
341 * Request-Range based requests to work around a bug in Netscape
342 * Navigator 2-3 and MSIE 3.
345 if (!(range = apr_table_get(r->headers_in, "Range"))) {
346 range = apr_table_get(r->headers_in, "Request-Range");
349 if (!range || strncasecmp(range, "bytes=", 6) || r->status != HTTP_OK) {
353 /* is content already a single range? */
354 if (apr_table_get(r->headers_out, "Content-Range")) {
358 /* is content already a multiple range? */
359 if ((ct = apr_table_get(r->headers_out, "Content-Type"))
360 && (!strncasecmp(ct, "multipart/byteranges", 20)
361 || !strncasecmp(ct, "multipart/x-byteranges", 22))) {
365 /* Check the If-Range header for Etag or Date.
366 * Note that this check will return false (as required) if either
367 * of the two etags are weak.
369 if ((if_range = apr_table_get(r->headers_in, "If-Range"))) {
370 if (if_range[0] == '"') {
371 if (!(match = apr_table_get(r->headers_out, "Etag"))
372 || (strcmp(if_range, match) != 0)) {
376 else if (!(match = apr_table_get(r->headers_out, "Last-Modified"))
377 || (strcmp(if_range, match) != 0)) {
382 if (!ap_strchr_c(range, ',')) {
387 /* a multiple range */
391 r->status = HTTP_PARTIAL_CONTENT;
392 r->range = range + 6;