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47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
59 #ifndef APACHE_HTTP_PROTOCOL_H
60 #define APACHE_HTTP_PROTOCOL_H
63 #include "apr_hooks.h"
64 #include "apr_portable.h"
66 #include "apr_buckets.h"
67 #include "util_filter.h"
74 * @package HTTP protocol handling
77 /* This is an optimization. We keep a record of the filter_rec that
78 * stores the old_write filter, so that we can avoid strcmp's later.
80 AP_DECLARE_DATA extern ap_filter_rec_t *ap_old_write_func;
83 * Prototypes for routines which either talk directly back to the user,
84 * or control the ones that eventually do.
88 * Read a request and fill in the fields.
89 * @param c The current connection
90 * @return The new request_rec
92 request_rec *ap_read_request(conn_rec *c);
95 * Read the mime-encoded headers.
96 * @param r The current request
98 void ap_get_mime_headers(request_rec *r);
100 /* Finish up stuff after a request */
103 * Called at completion of sending the response. It sends the terminating
104 * protocol information.
105 * @param r The current request
106 * @deffunc void ap_finalize_request_protocol(request_rec *r)
108 AP_DECLARE(void) ap_finalize_request_protocol(request_rec *r);
111 * Send error back to client.
112 * @param r The current request
113 * @param recursive_error last arg indicates error status in case we get
114 * an error in the process of trying to deal with an ErrorDocument
115 * to handle some other error. In that case, we print the default
116 * report for the first thing that went wrong, and more briefly report
117 * on the problem with the ErrorDocument.
118 * @deffunc void ap_send_error_response(request_rec *r, int recursive_error)
120 AP_DECLARE(void) ap_send_error_response(request_rec *r, int recursive_error);
122 /* Set last modified header line from the lastmod date of the associated file.
123 * Also, set content length.
125 * May return an error status, typically HTTP_NOT_MODIFIED (that when the
126 * permit_cache argument is set to one).
130 * Set the content length for this request
131 * @param r The current request
132 * @param length The new content length
133 * @deffunc void ap_set_content_length(request_rec *r, apr_off_t length)
135 AP_DECLARE(void) ap_set_content_length(request_rec *r, apr_off_t length);
138 * Set the keepalive status for this request
139 * @param r The current request
140 * @return 1 if keepalive can be set, 0 otherwise
141 * @deffunc int ap_set_keepalive(request_rec *r)
143 AP_DECLARE(int) ap_set_keepalive(request_rec *r);
146 * Return the latest rational time from a request/mtime pair. Mtime is
147 * returned unless it's in the future, in which case we return the current time.
148 * @param r The current request
149 * @param mtime The last modified time
150 * @return the latest rational time.
151 * @deffunc apr_time_t ap_rationalize_mtime(request_rec *r, apr_time_t mtime)
153 AP_DECLARE(apr_time_t) ap_rationalize_mtime(request_rec *r, apr_time_t mtime);
156 * Build the content-type that should be sent to the client from the
157 * content-type specified. The following rules are followed:
158 * - if type is NULL, type is set to ap_default_type(r)
159 * - if charset adding is disabled, stop processing and return type.
160 * - then, if there are no parameters on type, add the default charset
162 * @param r The current request
163 * @return The content-type
164 * @deffunc const char *ap_make_content_type(request_rec *r, const char *type);
166 AP_DECLARE(const char *) ap_make_content_type(request_rec *r, const char *type);
169 * Construct an entity tag from the resource information. If it's a real
170 * file, build in some of the file characteristics.
171 * @param r The current request
172 * @param force_weak Force the entity tag to be weak - it could be modified
173 * again in as short an interval.
174 * @return The entity tag
175 * @deffunc char *ap_make_etag(request_rec *r, int force_weak)
177 AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak);
180 * Set the E-tag outgoing header
181 * @param The current request
182 * @deffunc void ap_set_etag(request_rec *r)
184 AP_DECLARE(void) ap_set_etag(request_rec *r);
187 * Set the last modified time for the file being sent
188 * @param r The current request
189 * @deffunc void ap_set_last_modified(request_rec *r)
191 AP_DECLARE(void) ap_set_last_modified(request_rec *r);
194 * Implements condition GET rules for HTTP/1.1 specification. This function
195 * inspects the client headers and determines if the response fulfills
196 * the requirements specified.
197 * @param r The current request
198 * @return 1 if the response fulfills the condition GET rules, 0 otherwise
199 * @deffunc int ap_meets_conditions(request_rec *r)
201 AP_DECLARE(int) ap_meets_conditions(request_rec *r);
203 /* Other ways to send stuff at the client. All of these keep track
204 * of bytes_sent automatically. This indirection is intended to make
205 * it a little more painless to slide things like HTTP-NG packetization
206 * underneath the main body of the code later. In the meantime, it lets
207 * us centralize a bit of accounting (bytes_sent).
209 * These also return the number of bytes written by the call.
210 * They should only be called with a timeout registered, for obvious reaasons.
211 * (Ditto the send_header stuff).
215 * Send an entire file to the client, using sendfile if supported by the
217 * @param fd The file to send.
218 * @param r The current request
219 * @param offset Offset into the file to start sending.
220 * @param length Amount of data to send
221 * @param nbytes Amount of data actually sent
222 * @deffunc apr_status_t ap_send_fd(apr_file_t *fd, request_rec *r, apr_off_t offset, apr_size_t length, apr_size_t *nbytes);
224 AP_DECLARE(apr_status_t) ap_send_fd(apr_file_t *fd, request_rec *r, apr_off_t offset,
225 apr_size_t length, apr_size_t *nbytes);
229 * Send an MMAP'ed file to the client
230 * @param mm The MMAP'ed file to send
231 * @param r The current request
232 * @param offset The offset into the MMAP to start sending
233 * @param length The amount of data to send
234 * @return The number of bytes sent
235 * @deffunc size_t ap_send_mmap(apr_mmap_t *mm, request_rec *r, size_t offset, size_t length)
237 AP_DECLARE(size_t) ap_send_mmap(apr_mmap_t *mm, request_rec *r, size_t offset,
243 * Register a new request method, and return the offset that will be
244 * associated with that method.
246 * @param p The pool to create registered method numbers from.
247 * @param methname The name of the new method to register.
248 * @return Ab int value representing an offset into a bitmask.
250 AP_DECLARE(int) ap_method_register(apr_pool_t *p, const char *methname);
253 * Initialize the method_registry and allocate memory for it.
255 * @param p Pool to allocate memory for the registry from.
257 AP_DECLARE(void) ap_method_registry_init(apr_pool_t *p);
260 * This is a convenience macro to ease with checking a mask
261 * against a method name.
263 #define AP_METHOD_CHECK_ALLOWED(mask, methname) \
264 ((mask) & (AP_METHOD_BIT << ap_method_number_of((methname))))
267 * Create a new method list with the specified number of preallocated
268 * slots for extension methods.
270 * @param p Pointer to a pool in which the structure should be
272 * @param nelts Number of preallocated extension slots
273 * @return Pointer to the newly created structure.
274 * @deffunc ap_method_list_t ap_make_method_list(apr_pool_t *p, int nelts)
276 AP_DECLARE(ap_method_list_t *) ap_make_method_list(apr_pool_t *p, int nelts);
277 AP_DECLARE(void) ap_copy_method_list(ap_method_list_t *dest,
278 ap_method_list_t *src);
279 AP_DECLARE_NONSTD(void) ap_method_list_do(int (*comp) (void *urec, const char *mname,
282 const ap_method_list_t *ml, ...);
283 AP_DECLARE(void) ap_method_list_vdo(int (*comp) (void *urec, const char *mname,
285 void *rec, const ap_method_list_t *ml,
288 * Search for an HTTP method name in an ap_method_list_t structure, and
289 * return true if found.
291 * @param method String containing the name of the method to check.
292 * @param l Pointer to a method list, such as cmd->methods_limited.
293 * @return 1 if method is in the list, otherwise 0
294 * @deffunc int ap_method_in_list(const char *method, ap_method_list_t *l)
296 AP_DECLARE(int) ap_method_in_list(ap_method_list_t *l, const char *method);
299 * Add an HTTP method name to an ap_method_list_t structure if it isn't
302 * @param method String containing the name of the method to check.
303 * @param l Pointer to a method list, such as cmd->methods_limited.
305 * @deffunc void ap_method_in_list(ap_method_list_t *l, const char *method)
307 AP_DECLARE(void) ap_method_list_add(ap_method_list_t *l, const char *method);
310 * Remove an HTTP method name from an ap_method_list_t structure.
312 * @param l Pointer to a method list, such as cmd->methods_limited.
313 * @param method String containing the name of the method to remove.
315 * @deffunc void ap_method_list_remove(ap_method_list_t *l, const char *method)
317 AP_DECLARE(void) ap_method_list_remove(ap_method_list_t *l,
321 * Reset a method list to be completely empty.
323 * @param l Pointer to a method list, such as cmd->methods_limited.
325 * @deffunc void ap_clear_method_list(ap_method_list_t *l)
327 AP_DECLARE(void) ap_clear_method_list(ap_method_list_t *l);
330 * Set the content type for this request (r->content_type).
332 * This function must be called to set r->content_type in order
333 * for the AddOutputFilterByType directive to work correctly.
334 * @param r The current request
335 * @param length The new content type
336 * @deffunc void ap_set_content_type(request_rec *r, const char* ct)
338 AP_DECLARE(void) ap_set_content_type(request_rec *r, const char *ct);
340 /* Hmmm... could macrofy these for now, and maybe forever, though the
341 * definitions of the macros would get a whole lot hairier.
345 * Output one character for this request
346 * @param c the character to output
347 * @param r the current request
348 * @return The number of bytes sent
349 * @deffunc int ap_rputc(int c, request_rec *r)
351 AP_DECLARE(int) ap_rputc(int c, request_rec *r);
354 * Output a string for the current request
355 * @param str The string to output
356 * @param r The current request
357 * @return The number of bytes sent
358 * @deffunc int ap_rputs(const char *str, request_rec *r)
360 AP_DECLARE(int) ap_rputs(const char *str, request_rec *r);
363 * Write a buffer for the current request
364 * @param buf The buffer to write
365 * @param nbyte The number of bytes to send from the buffer
366 * @param r The current request
367 * @return The number of bytes sent
368 * @deffunc int ap_rwrite(const void *buf, int nbyte, request_rec *r)
370 AP_DECLARE(int) ap_rwrite(const void *buf, int nbyte, request_rec *r);
373 * Write an unspecified number of strings to the request
374 * @param r The current request
375 * @param ... The strings to write
376 * @return The number of bytes sent
377 * @deffunc int ap_rvputs(request_rec *r, ...)
379 AP_DECLARE_NONSTD(int) ap_rvputs(request_rec *r,...);
382 * Output data to the client in a printf format
383 * @param r The current request
384 * @param fmt The format string
385 * @param vlist The arguments to use to fill out the format string
386 * @return The number of bytes sent
387 * @deffunc int ap_vrprintf(request_rec *r, const char *fmt, va_list vlist)
389 AP_DECLARE(int) ap_vrprintf(request_rec *r, const char *fmt, va_list vlist);
392 * Output data to the client in a printf format
393 * @param r The current request
394 * @param fmt The format string
395 * @param ... The arguments to use to fill out the format string
396 * @return The number of bytes sent
397 * @deffunc int ap_rprintf(request_rec *r, const char *fmt, ...)
399 AP_DECLARE_NONSTD(int) ap_rprintf(request_rec *r, const char *fmt,...)
400 __attribute__((format(printf,2,3)));
402 * Flush all of the data for the current request to the client
403 * @param r The current request
404 * @return The number of bytes sent
405 * @deffunc int ap_rflush(request_rec *r)
407 AP_DECLARE(int) ap_rflush(request_rec *r);
410 * Index used in custom_responses array for a specific error code
411 * (only use outside protocol.c is in getting them configured).
412 * @param status HTTP status code
413 * @return The index of the response
414 * @deffunc int ap_index_of_response(int status)
416 AP_DECLARE(int) ap_index_of_response(int status);
419 * Return the Status-Line for a given status code (excluding the
420 * HTTP-Version field). If an invalid or unknown status code is
421 * passed, "500 Internal Server Error" will be returned.
422 * @param status The HTTP status code
423 * @return The Status-Line
424 * @deffunc const char *ap_get_status_line(int status)
426 AP_DECLARE(const char *) ap_get_status_line(int status);
428 /* Reading a block of data from the client connection (e.g., POST arg) */
431 * Setup the client to allow Apache to read the request body.
432 * @param r The current request
433 * @param read_policy How the server should interpret a chunked
434 * transfer-encoding. One of: <pre>
435 * REQUEST_NO_BODY Send 413 error if message has any body
436 * REQUEST_CHUNKED_ERROR Send 411 error if body without Content-Length
437 * REQUEST_CHUNKED_DECHUNK If chunked, remove the chunks for me.
439 * @return either OK or an error code
440 * @deffunc int ap_setup_cleint_block(request_rec *r, int read_policy)
442 AP_DECLARE(int) ap_setup_client_block(request_rec *r, int read_policy);
445 * Determine if the client has sent any data. This also sends a
446 * 100 Continue resposne to HTTP/1.1 clients, so modules should not be called
447 * until the module is ready to read content.
448 * @warning Never call this function more than once.
449 * @param r The current request
450 * @return 0 if there is no message to read, 1 otherwise
451 * @deffunc int ap_should_client_block(request_rec *r)
453 AP_DECLARE(int) ap_should_client_block(request_rec *r);
456 * Call this in a loop. It will put data into a buffer and return the length
458 * @param r The current request
459 * @param buffer The buffer in which to store the data
460 * @param bufsiz The size of the buffer
461 * @return Number of bytes inserted into the buffer. When done reading, 0
462 * if EOF, or -1 if there was an error
463 * @deffunc long ap_get_client_block(request_rec *r, char *buffer, apr_size_t bufsiz)
465 AP_DECLARE(long) ap_get_client_block(request_rec *r, char *buffer, apr_size_t bufsiz);
468 * In HTTP/1.1, any method can have a body. However, most GET handlers
469 * wouldn't know what to do with a request body if they received one.
470 * This helper routine tests for and reads any message body in the request,
471 * simply discarding whatever it receives. We need to do this because
472 * failing to read the request body would cause it to be interpreted
473 * as the next request on a persistent connection.
474 * @param r The current request
475 * @return error status if request is malformed, OK otherwise
476 * @deffunc int ap_discard_request_body(request_rec *r)
478 AP_DECLARE(int) ap_discard_request_body(request_rec *r);
482 * Setup the output headers so that the client knows how to authenticate
483 * itself the next time, if an authentication request failed. This function
484 * works for both basic and digest authentication
485 * @param r The current request
486 * @deffunc void ap_note_auth_failure(request_rec *r)
488 AP_DECLARE(void) ap_note_auth_failure(request_rec *r);
491 * Setup the output headers so that the client knows how to authenticate
492 * itself the next time, if an authentication request failed. This function
493 * works only for basic authentication
494 * @param r The current request
495 * @deffunc void ap_note_basic_auth_failure(request_rec *r)
497 AP_DECLARE(void) ap_note_basic_auth_failure(request_rec *r);
500 * Setup the output headers so that the client knows how to authenticate
501 * itself the next time, if an authentication request failed. This function
502 * works only for digest authentication
503 * @param r The current request
504 * @deffunc void ap_note_digest_auth_failure(request_rec *r)
506 AP_DECLARE(void) ap_note_digest_auth_failure(request_rec *r);
509 * Get the password from the request headers
510 * @param r The current request
511 * @param pw The password as set in the headers
512 * @return 0 (OK) if it set the 'pw' argument (and assured
513 * a correct value in r->connection->user); otherwise it returns
514 * an error code, either HTTP_INTERNAL_SERVER_ERROR if things are
515 * really confused, HTTP_UNAUTHORIZED if no authentication at all
516 * seemed to be in use, or DECLINED if there was authentication but
517 * it wasn't Basic (in which case, the caller should presumably
519 * @deffunc int ap_get_basic_auth_pw(request_rec *r, const char **pw)
521 AP_DECLARE(int) ap_get_basic_auth_pw(request_rec *r, const char **pw);
524 * parse_uri: break apart the uri
525 * @warning Side Effects: <pre>
526 * - sets r->args to rest after '?' (or NULL if no '?')
527 * - sets r->uri to request uri (without r->args part)
528 * - sets r->hostname (if not set already) from request (scheme://host:port)
530 * @param r The current request
531 * @param uri The uri to break apart
532 * @deffunc void ap_parse_uri(request_rec *r, const char *uri)
534 AP_CORE_DECLARE(void) ap_parse_uri(request_rec *r, const char *uri);
537 * Get the next line of input for the request
538 * @param s The buffer into which to read the line
539 * @param n The size of the buffer
540 * @param r The request
541 * @param fold Whether to merge continuation lines
542 * @return The length of the line, if successful
543 * n, if the line is too big to fit in the buffer
544 * -1 for miscellaneous errors
545 * @deffunc int ap_method_number_of(const char *method)
547 AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int fold);
550 * Get the next line of input for the request
552 * Note: on ASCII boxes, ap_rgetline is a macro which simply calls
553 * ap_rgetline_core to get the line of input.
555 * on EBCDIC boxes, ap_rgetline is a wrapper function which
556 * translates ASCII protocol lines to the local EBCDIC code page
557 * after getting the line of input.
559 * @param s Pointer to the pointer to the buffer into which the line
560 * should be read; if *s==NULL, a buffer of the necessary size
561 * to hold the data will be allocated from the request pool
562 * @param n The size of the buffer
563 * @param read The length of the line.
564 * @param r The request
565 * @param fold Whether to merge continuation lines
566 * @return APR_SUCCESS, if successful
567 * APR_ENOSPC, if the line is too big to fit in the buffer
568 * Other errors where appropriate
570 #if APR_CHARSET_EBCDIC
571 AP_DECLARE(apr_status_t) ap_rgetline(char **s, apr_size_t n,
573 request_rec *r, int fold);
574 #else /* ASCII box */
575 #define ap_rgetline(s, n, read, r, fold) \
576 ap_rgetline_core((s), (n), (read), (r), (fold))
578 AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
580 request_rec *r, int fold);
583 * Get the method number associated with the given string, assumed to
584 * contain an HTTP method. Returns M_INVALID if not recognized.
585 * @param method A string containing a valid HTTP method
586 * @return The method number
588 AP_DECLARE(int) ap_method_number_of(const char *method);
591 * Get the method name associated with the given internal method
592 * number. Returns NULL if not recognized.
593 * @param p A pool to use for temporary allocations.
594 * @param methnum An integer value corresponding to an internal method number
595 * @return The name corresponding to the method number
597 AP_DECLARE(const char *) ap_method_name_of(apr_pool_t *p, int methnum);
602 * post_read_request --- run right after read_request or internal_redirect,
603 * and not run during any subrequests.
606 * This hook allows modules to affect the request immediately after the request
607 * has been read, and before any other phases have been processes. This allows
608 * modules to make decisions based upon the input header fields
609 * @param r The current request
610 * @return OK or DECLINED
611 * @deffunc ap_run_post_read_request(request_rec *r)
613 AP_DECLARE_HOOK(int,post_read_request,(request_rec *r))
616 * This hook allows modules to perform any module-specific logging activities
617 * over and above the normal server things.
618 * @param r The current request
619 * @return OK, DECLINED, or HTTP_...
620 * @deffunc int ap_run_log_transaction(request_rec *r)
622 AP_DECLARE_HOOK(int,log_transaction,(request_rec *r))
625 * This hook allows modules to retrieve the http method from a request. This
626 * allows Apache modules to easily extend the methods that Apache understands
627 * @param r The current request
628 * @return The http method from the request
629 * @deffunc const char *ap_run_http_method(const request_rec *r)
631 AP_DECLARE_HOOK(const char *,http_method,(const request_rec *r))
634 * Return the default port from the current request
635 * @param r The current request
636 * @return The current port
637 * @deffunc apr_port_t ap_run_default_port(const request_rec *r)
639 AP_DECLARE_HOOK(apr_port_t,default_port,(const request_rec *r))
641 typedef struct ap_bucket_error ap_bucket_error;
644 * A bucket referring to an HTTP error
645 * This bucket can be passed down the filter stack to indicate that an
646 * HTTP error occurred while running a filter. In order for this bucket
647 * to be used successfully, it MUST be sent as the first bucket in the
648 * first brigade to be sent from a given filter.
650 struct ap_bucket_error {
651 /** The error code */
653 /** The error string */
657 AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_error;
660 * Make the bucket passed in an error bucket
661 * @param b The bucket to make into an error bucket
662 * @param error The HTTP error code to put in the bucket.
663 * @param buf An optional error string to put in the bucket.
664 * @param p A pool to allocate out of.
665 * @return The new bucket, or NULL if allocation failed
666 * @deffunc apr_bucket *ap_bucket_error_make(apr_bucket *b, int error, const char *buf, apr_pool_t *p)
668 AP_DECLARE(apr_bucket *) ap_bucket_error_make(apr_bucket *b, int error,
669 const char *buf, apr_pool_t *p);
672 * Create a bucket referring to an HTTP error.
673 * @param error The HTTP error code to put in the bucket.
674 * @param buf An optional error string to put in the bucket.
675 * @param p A pool to allocate the error string out of.
676 * @param list The bucket allocator from which to allocate the bucket
677 * @return The new bucket, or NULL if allocation failed
678 * @deffunc apr_bucket *ap_bucket_error_create(int error, const char *buf, apr_pool_t *p, apr_bucket_alloc_t *list)
680 AP_DECLARE(apr_bucket *) ap_bucket_error_create(int error, const char *buf,
682 apr_bucket_alloc_t *list);
684 AP_DECLARE_NONSTD(apr_status_t) ap_byterange_filter(ap_filter_t *f, apr_bucket_brigade *b);
685 AP_DECLARE_NONSTD(apr_status_t) ap_http_header_filter(ap_filter_t *f, apr_bucket_brigade *b);
686 AP_DECLARE_NONSTD(apr_status_t) ap_content_length_filter(ap_filter_t *,
687 apr_bucket_brigade *);
688 AP_DECLARE_NONSTD(apr_status_t) ap_old_write_filter(ap_filter_t *f, apr_bucket_brigade *b);
691 * Setting up the protocol fields for subsidiary requests...
692 * Also, a wrapup function to keep the internal accounting straight.
694 void ap_set_sub_req_protocol(request_rec *rnew, const request_rec *r);
695 void ap_finalize_sub_req_protocol(request_rec *sub_r);
701 #endif /* !APACHE_HTTP_PROTOCOL_H */