1 /* ====================================================================
2 * The Apache Software License, Version 1.1
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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,
171 * Precompile metadata structures used by ap_make_content_type()
172 * @param r The pool to use for allocations
173 * @deffunc void ap_setup_make_content_type(apr_pool_t *pool)
175 AP_DECLARE(void) ap_setup_make_content_type(apr_pool_t *pool);
176 #endif /* CORE_PRIVATE */
179 * Construct an entity tag from the resource information. If it's a real
180 * file, build in some of the file characteristics.
181 * @param r The current request
182 * @param force_weak Force the entity tag to be weak - it could be modified
183 * again in as short an interval.
184 * @return The entity tag
185 * @deffunc char *ap_make_etag(request_rec *r, int force_weak)
187 AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak);
190 * Set the E-tag outgoing header
191 * @param The current request
192 * @deffunc void ap_set_etag(request_rec *r)
194 AP_DECLARE(void) ap_set_etag(request_rec *r);
197 * Set the last modified time for the file being sent
198 * @param r The current request
199 * @deffunc void ap_set_last_modified(request_rec *r)
201 AP_DECLARE(void) ap_set_last_modified(request_rec *r);
204 * Implements condition GET rules for HTTP/1.1 specification. This function
205 * inspects the client headers and determines if the response fulfills
206 * the requirements specified.
207 * @param r The current request
208 * @return 1 if the response fulfills the condition GET rules, 0 otherwise
209 * @deffunc int ap_meets_conditions(request_rec *r)
211 AP_DECLARE(int) ap_meets_conditions(request_rec *r);
213 /* Other ways to send stuff at the client. All of these keep track
214 * of bytes_sent automatically. This indirection is intended to make
215 * it a little more painless to slide things like HTTP-NG packetization
216 * underneath the main body of the code later. In the meantime, it lets
217 * us centralize a bit of accounting (bytes_sent).
219 * These also return the number of bytes written by the call.
220 * They should only be called with a timeout registered, for obvious reaasons.
221 * (Ditto the send_header stuff).
225 * Send an entire file to the client, using sendfile if supported by the
227 * @param fd The file to send.
228 * @param r The current request
229 * @param offset Offset into the file to start sending.
230 * @param length Amount of data to send
231 * @param nbytes Amount of data actually sent
232 * @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);
234 AP_DECLARE(apr_status_t) ap_send_fd(apr_file_t *fd, request_rec *r, apr_off_t offset,
235 apr_size_t length, apr_size_t *nbytes);
239 * Send an MMAP'ed file to the client
240 * @param mm The MMAP'ed file to send
241 * @param r The current request
242 * @param offset The offset into the MMAP to start sending
243 * @param length The amount of data to send
244 * @return The number of bytes sent
245 * @deffunc size_t ap_send_mmap(apr_mmap_t *mm, request_rec *r, size_t offset, size_t length)
247 AP_DECLARE(size_t) ap_send_mmap(apr_mmap_t *mm, request_rec *r, size_t offset,
253 * Register a new request method, and return the offset that will be
254 * associated with that method.
256 * @param p The pool to create registered method numbers from.
257 * @param methname The name of the new method to register.
258 * @return Ab int value representing an offset into a bitmask.
260 AP_DECLARE(int) ap_method_register(apr_pool_t *p, const char *methname);
263 * Initialize the method_registry and allocate memory for it.
265 * @param p Pool to allocate memory for the registry from.
267 AP_DECLARE(void) ap_method_registry_init(apr_pool_t *p);
270 * This is a convenience macro to ease with checking a mask
271 * against a method name.
273 #define AP_METHOD_CHECK_ALLOWED(mask, methname) \
274 ((mask) & (AP_METHOD_BIT << ap_method_number_of((methname))))
277 * Create a new method list with the specified number of preallocated
278 * slots for extension methods.
280 * @param p Pointer to a pool in which the structure should be
282 * @param nelts Number of preallocated extension slots
283 * @return Pointer to the newly created structure.
284 * @deffunc ap_method_list_t ap_make_method_list(apr_pool_t *p, int nelts)
286 AP_DECLARE(ap_method_list_t *) ap_make_method_list(apr_pool_t *p, int nelts);
287 AP_DECLARE(void) ap_copy_method_list(ap_method_list_t *dest,
288 ap_method_list_t *src);
289 AP_DECLARE_NONSTD(void) ap_method_list_do(int (*comp) (void *urec, const char *mname,
292 const ap_method_list_t *ml, ...);
293 AP_DECLARE(void) ap_method_list_vdo(int (*comp) (void *urec, const char *mname,
295 void *rec, const ap_method_list_t *ml,
298 * Search for an HTTP method name in an ap_method_list_t structure, and
299 * return true if found.
301 * @param method String containing the name of the method to check.
302 * @param l Pointer to a method list, such as cmd->methods_limited.
303 * @return 1 if method is in the list, otherwise 0
304 * @deffunc int ap_method_in_list(const char *method, ap_method_list_t *l)
306 AP_DECLARE(int) ap_method_in_list(ap_method_list_t *l, const char *method);
309 * Add an HTTP method name to an ap_method_list_t structure if it isn't
312 * @param method String containing the name of the method to check.
313 * @param l Pointer to a method list, such as cmd->methods_limited.
315 * @deffunc void ap_method_in_list(ap_method_list_t *l, const char *method)
317 AP_DECLARE(void) ap_method_list_add(ap_method_list_t *l, const char *method);
320 * Remove an HTTP method name from an ap_method_list_t structure.
322 * @param l Pointer to a method list, such as cmd->methods_limited.
323 * @param method String containing the name of the method to remove.
325 * @deffunc void ap_method_list_remove(ap_method_list_t *l, const char *method)
327 AP_DECLARE(void) ap_method_list_remove(ap_method_list_t *l,
331 * Reset a method list to be completely empty.
333 * @param l Pointer to a method list, such as cmd->methods_limited.
335 * @deffunc void ap_clear_method_list(ap_method_list_t *l)
337 AP_DECLARE(void) ap_clear_method_list(ap_method_list_t *l);
340 * Set the content type for this request (r->content_type).
342 * This function must be called to set r->content_type in order
343 * for the AddOutputFilterByType directive to work correctly.
344 * @param r The current request
345 * @param length The new content type
346 * @deffunc void ap_set_content_type(request_rec *r, const char* ct)
348 AP_DECLARE(void) ap_set_content_type(request_rec *r, const char *ct);
350 /* Hmmm... could macrofy these for now, and maybe forever, though the
351 * definitions of the macros would get a whole lot hairier.
355 * Output one character for this request
356 * @param c the character to output
357 * @param r the current request
358 * @return The number of bytes sent
359 * @deffunc int ap_rputc(int c, request_rec *r)
361 AP_DECLARE(int) ap_rputc(int c, request_rec *r);
364 * Output a string for the current request
365 * @param str The string to output
366 * @param r The current request
367 * @return The number of bytes sent
368 * @deffunc int ap_rputs(const char *str, request_rec *r)
370 AP_DECLARE(int) ap_rputs(const char *str, request_rec *r);
373 * Write a buffer for the current request
374 * @param buf The buffer to write
375 * @param nbyte The number of bytes to send from the buffer
376 * @param r The current request
377 * @return The number of bytes sent
378 * @deffunc int ap_rwrite(const void *buf, int nbyte, request_rec *r)
380 AP_DECLARE(int) ap_rwrite(const void *buf, int nbyte, request_rec *r);
383 * Write an unspecified number of strings to the request
384 * @param r The current request
385 * @param ... The strings to write
386 * @return The number of bytes sent
387 * @deffunc int ap_rvputs(request_rec *r, ...)
389 AP_DECLARE_NONSTD(int) ap_rvputs(request_rec *r,...);
392 * Output data to the client in a printf format
393 * @param r The current request
394 * @param fmt The format string
395 * @param vlist The arguments to use to fill out the format string
396 * @return The number of bytes sent
397 * @deffunc int ap_vrprintf(request_rec *r, const char *fmt, va_list vlist)
399 AP_DECLARE(int) ap_vrprintf(request_rec *r, const char *fmt, va_list vlist);
402 * Output data to the client in a printf format
403 * @param r The current request
404 * @param fmt The format string
405 * @param ... The arguments to use to fill out the format string
406 * @return The number of bytes sent
407 * @deffunc int ap_rprintf(request_rec *r, const char *fmt, ...)
409 AP_DECLARE_NONSTD(int) ap_rprintf(request_rec *r, const char *fmt,...)
410 __attribute__((format(printf,2,3)));
412 * Flush all of the data for the current request to the client
413 * @param r The current request
414 * @return The number of bytes sent
415 * @deffunc int ap_rflush(request_rec *r)
417 AP_DECLARE(int) ap_rflush(request_rec *r);
420 * Index used in custom_responses array for a specific error code
421 * (only use outside protocol.c is in getting them configured).
422 * @param status HTTP status code
423 * @return The index of the response
424 * @deffunc int ap_index_of_response(int status)
426 AP_DECLARE(int) ap_index_of_response(int status);
429 * Return the Status-Line for a given status code (excluding the
430 * HTTP-Version field). If an invalid or unknown status code is
431 * passed, "500 Internal Server Error" will be returned.
432 * @param status The HTTP status code
433 * @return The Status-Line
434 * @deffunc const char *ap_get_status_line(int status)
436 AP_DECLARE(const char *) ap_get_status_line(int status);
438 /* Reading a block of data from the client connection (e.g., POST arg) */
441 * Setup the client to allow Apache to read the request body.
442 * @param r The current request
443 * @param read_policy How the server should interpret a chunked
444 * transfer-encoding. One of: <pre>
445 * REQUEST_NO_BODY Send 413 error if message has any body
446 * REQUEST_CHUNKED_ERROR Send 411 error if body without Content-Length
447 * REQUEST_CHUNKED_DECHUNK If chunked, remove the chunks for me.
449 * @return either OK or an error code
450 * @deffunc int ap_setup_client_block(request_rec *r, int read_policy)
452 AP_DECLARE(int) ap_setup_client_block(request_rec *r, int read_policy);
455 * Determine if the client has sent any data. This also sends a
456 * 100 Continue response to HTTP/1.1 clients, so modules should not be called
457 * until the module is ready to read content.
458 * @warning Never call this function more than once.
459 * @param r The current request
460 * @return 0 if there is no message to read, 1 otherwise
461 * @deffunc int ap_should_client_block(request_rec *r)
463 AP_DECLARE(int) ap_should_client_block(request_rec *r);
466 * Call this in a loop. It will put data into a buffer and return the length
468 * @param r The current request
469 * @param buffer The buffer in which to store the data
470 * @param bufsiz The size of the buffer
471 * @return Number of bytes inserted into the buffer. When done reading, 0
472 * if EOF, or -1 if there was an error
473 * @deffunc long ap_get_client_block(request_rec *r, char *buffer, apr_size_t bufsiz)
475 AP_DECLARE(long) ap_get_client_block(request_rec *r, char *buffer, apr_size_t bufsiz);
478 * In HTTP/1.1, any method can have a body. However, most GET handlers
479 * wouldn't know what to do with a request body if they received one.
480 * This helper routine tests for and reads any message body in the request,
481 * simply discarding whatever it receives. We need to do this because
482 * failing to read the request body would cause it to be interpreted
483 * as the next request on a persistent connection.
484 * @param r The current request
485 * @return error status if request is malformed, OK otherwise
486 * @deffunc int ap_discard_request_body(request_rec *r)
488 AP_DECLARE(int) ap_discard_request_body(request_rec *r);
492 * Setup the output headers so that the client knows how to authenticate
493 * itself the next time, if an authentication request failed. This function
494 * works for both basic and digest authentication
495 * @param r The current request
496 * @deffunc void ap_note_auth_failure(request_rec *r)
498 AP_DECLARE(void) ap_note_auth_failure(request_rec *r);
501 * Setup the output headers so that the client knows how to authenticate
502 * itself the next time, if an authentication request failed. This function
503 * works only for basic authentication
504 * @param r The current request
505 * @deffunc void ap_note_basic_auth_failure(request_rec *r)
507 AP_DECLARE(void) ap_note_basic_auth_failure(request_rec *r);
510 * Setup the output headers so that the client knows how to authenticate
511 * itself the next time, if an authentication request failed. This function
512 * works only for digest authentication
513 * @param r The current request
514 * @deffunc void ap_note_digest_auth_failure(request_rec *r)
516 AP_DECLARE(void) ap_note_digest_auth_failure(request_rec *r);
519 * Get the password from the request headers
520 * @param r The current request
521 * @param pw The password as set in the headers
522 * @return 0 (OK) if it set the 'pw' argument (and assured
523 * a correct value in r->connection->user); otherwise it returns
524 * an error code, either HTTP_INTERNAL_SERVER_ERROR if things are
525 * really confused, HTTP_UNAUTHORIZED if no authentication at all
526 * seemed to be in use, or DECLINED if there was authentication but
527 * it wasn't Basic (in which case, the caller should presumably
529 * @deffunc int ap_get_basic_auth_pw(request_rec *r, const char **pw)
531 AP_DECLARE(int) ap_get_basic_auth_pw(request_rec *r, const char **pw);
534 * parse_uri: break apart the uri
535 * @warning Side Effects: <pre>
536 * - sets r->args to rest after '?' (or NULL if no '?')
537 * - sets r->uri to request uri (without r->args part)
538 * - sets r->hostname (if not set already) from request (scheme://host:port)
540 * @param r The current request
541 * @param uri The uri to break apart
542 * @deffunc void ap_parse_uri(request_rec *r, const char *uri)
544 AP_CORE_DECLARE(void) ap_parse_uri(request_rec *r, const char *uri);
547 * Get the next line of input for the request
548 * @param s The buffer into which to read the line
549 * @param n The size of the buffer
550 * @param r The request
551 * @param fold Whether to merge continuation lines
552 * @return The length of the line, if successful
553 * n, if the line is too big to fit in the buffer
554 * -1 for miscellaneous errors
555 * @deffunc int ap_method_number_of(const char *method)
557 AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int fold);
560 * Get the next line of input for the request
562 * Note: on ASCII boxes, ap_rgetline is a macro which simply calls
563 * ap_rgetline_core to get the line of input.
565 * on EBCDIC boxes, ap_rgetline is a wrapper function which
566 * translates ASCII protocol lines to the local EBCDIC code page
567 * after getting the line of input.
569 * @param s Pointer to the pointer to the buffer into which the line
570 * should be read; if *s==NULL, a buffer of the necessary size
571 * to hold the data will be allocated from the request pool
572 * @param n The size of the buffer
573 * @param read The length of the line.
574 * @param r The request
575 * @param fold Whether to merge continuation lines
576 * @return APR_SUCCESS, if successful
577 * APR_ENOSPC, if the line is too big to fit in the buffer
578 * Other errors where appropriate
580 #if APR_CHARSET_EBCDIC
581 AP_DECLARE(apr_status_t) ap_rgetline(char **s, apr_size_t n,
583 request_rec *r, int fold);
584 #else /* ASCII box */
585 #define ap_rgetline(s, n, read, r, fold) \
586 ap_rgetline_core((s), (n), (read), (r), (fold))
588 AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
590 request_rec *r, int fold);
593 * Get the method number associated with the given string, assumed to
594 * contain an HTTP method. Returns M_INVALID if not recognized.
595 * @param method A string containing a valid HTTP method
596 * @return The method number
598 AP_DECLARE(int) ap_method_number_of(const char *method);
601 * Get the method name associated with the given internal method
602 * number. Returns NULL if not recognized.
603 * @param p A pool to use for temporary allocations.
604 * @param methnum An integer value corresponding to an internal method number
605 * @return The name corresponding to the method number
607 AP_DECLARE(const char *) ap_method_name_of(apr_pool_t *p, int methnum);
612 * post_read_request --- run right after read_request or internal_redirect,
613 * and not run during any subrequests.
616 * This hook allows modules to affect the request immediately after the request
617 * has been read, and before any other phases have been processes. This allows
618 * modules to make decisions based upon the input header fields
619 * @param r The current request
620 * @return OK or DECLINED
621 * @deffunc ap_run_post_read_request(request_rec *r)
623 AP_DECLARE_HOOK(int,post_read_request,(request_rec *r))
626 * This hook allows modules to perform any module-specific logging activities
627 * over and above the normal server things.
628 * @param r The current request
629 * @return OK, DECLINED, or HTTP_...
630 * @deffunc int ap_run_log_transaction(request_rec *r)
632 AP_DECLARE_HOOK(int,log_transaction,(request_rec *r))
635 * This hook allows modules to retrieve the http method from a request. This
636 * allows Apache modules to easily extend the methods that Apache understands
637 * @param r The current request
638 * @return The http method from the request
639 * @deffunc const char *ap_run_http_method(const request_rec *r)
641 AP_DECLARE_HOOK(const char *,http_method,(const request_rec *r))
644 * Return the default port from the current request
645 * @param r The current request
646 * @return The current port
647 * @deffunc apr_port_t ap_run_default_port(const request_rec *r)
649 AP_DECLARE_HOOK(apr_port_t,default_port,(const request_rec *r))
651 typedef struct ap_bucket_error ap_bucket_error;
654 * A bucket referring to an HTTP error
655 * This bucket can be passed down the filter stack to indicate that an
656 * HTTP error occurred while running a filter. In order for this bucket
657 * to be used successfully, it MUST be sent as the first bucket in the
658 * first brigade to be sent from a given filter.
660 struct ap_bucket_error {
661 /** The error code */
663 /** The error string */
667 AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_error;
670 * Determine if a bucket is an error bucket
671 * @param e The bucket to inspect
672 * @return true or false
674 #define AP_BUCKET_IS_ERROR(e) (e->type == &ap_bucket_type_error)
677 * Make the bucket passed in an error bucket
678 * @param b The bucket to make into an error bucket
679 * @param error The HTTP error code to put in the bucket.
680 * @param buf An optional error string to put in the bucket.
681 * @param p A pool to allocate out of.
682 * @return The new bucket, or NULL if allocation failed
683 * @deffunc apr_bucket *ap_bucket_error_make(apr_bucket *b, int error, const char *buf, apr_pool_t *p)
685 AP_DECLARE(apr_bucket *) ap_bucket_error_make(apr_bucket *b, int error,
686 const char *buf, apr_pool_t *p);
689 * Create a bucket referring to an HTTP error.
690 * @param error The HTTP error code to put in the bucket.
691 * @param buf An optional error string to put in the bucket.
692 * @param p A pool to allocate the error string out of.
693 * @param list The bucket allocator from which to allocate the bucket
694 * @return The new bucket, or NULL if allocation failed
695 * @deffunc apr_bucket *ap_bucket_error_create(int error, const char *buf, apr_pool_t *p, apr_bucket_alloc_t *list)
697 AP_DECLARE(apr_bucket *) ap_bucket_error_create(int error, const char *buf,
699 apr_bucket_alloc_t *list);
701 AP_DECLARE_NONSTD(apr_status_t) ap_byterange_filter(ap_filter_t *f, apr_bucket_brigade *b);
702 AP_DECLARE_NONSTD(apr_status_t) ap_http_header_filter(ap_filter_t *f, apr_bucket_brigade *b);
703 AP_DECLARE_NONSTD(apr_status_t) ap_content_length_filter(ap_filter_t *,
704 apr_bucket_brigade *);
705 AP_DECLARE_NONSTD(apr_status_t) ap_old_write_filter(ap_filter_t *f, apr_bucket_brigade *b);
708 * Setting up the protocol fields for subsidiary requests...
709 * Also, a wrapup function to keep the internal accounting straight.
711 void ap_set_sub_req_protocol(request_rec *rnew, const request_rec *r);
712 void ap_finalize_sub_req_protocol(request_rec *sub_r);
718 #endif /* !APACHE_HTTP_PROTOCOL_H */