http_protocol.h

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/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef APACHE_HTTP_PROTOCOL_H
#define APACHE_HTTP_PROTOCOL_H
 
#include "httpd.h"
#include "apr_portable.h"
#include "apr_mmap.h"
#include "apr_buckets.h"
#include "util_filter.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
AP_DECLARE_HOOK(void,insert_error_filter,(request_rec *r))
 
 
AP_DECLARE_DATA extern ap_filter_rec_t *ap_old_write_func;
 
/*
 * Prototypes for routines which either talk directly back to the user,
 * or control the ones that eventually do.
 */
 
AP_DECLARE(request_rec *) ap_create_request(conn_rec *c);
 
request_rec *ap_read_request(conn_rec *c);
 
AP_DECLARE(int) ap_parse_request_line(request_rec *r);
 
AP_DECLARE(int) ap_check_request_header(request_rec *r);
 
AP_DECLARE(void) ap_get_mime_headers(request_rec *r);
 
AP_DECLARE(void) ap_get_mime_headers_core(request_rec *r,
                                          apr_bucket_brigade *bb);
 
AP_DECLARE(int) ap_post_read_request(request_rec *r);
 
/* Finish up stuff after a request */
 
AP_DECLARE(void) ap_finalize_request_protocol(request_rec *r);
 
AP_DECLARE(void) ap_send_error_response(request_rec *r, int recursive_error);
 
/* Set last modified header line from the lastmod date of the associated file.
 * Also, set content length.
 *
 * May return an error status, typically HTTP_NOT_MODIFIED (that when the
 * permit_cache argument is set to one).
 */
 
AP_DECLARE(void) ap_set_content_length(request_rec *r, apr_off_t length);
 
AP_DECLARE(int) ap_set_keepalive(request_rec *r);
 
AP_DECLARE(apr_time_t) ap_rationalize_mtime(request_rec *r, apr_time_t mtime);
 
AP_DECLARE(const char *) ap_make_content_type(request_rec *r,
                                              const char *type);
 
AP_DECLARE(void) ap_setup_make_content_type(apr_pool_t *pool);
 
typedef struct etag_rec etag_rec;
 
struct etag_rec {
    const char *vlist_validator;
    apr_time_t request_time;
    apr_finfo_t *finfo;
    const char *pathname;
    apr_file_t *fd;
    int force_weak;
};
 
AP_DECLARE(char *) ap_make_etag(request_rec *r, int force_weak);
 
AP_DECLARE(char *) ap_make_etag_ex(request_rec *r, etag_rec *er);
 
AP_DECLARE(void) ap_set_etag(request_rec *r);
 
AP_DECLARE(void) ap_set_etag_fd(request_rec *r, apr_file_t *fd);
 
AP_DECLARE(void) ap_set_last_modified(request_rec *r);
 
typedef enum {
    AP_CONDITION_NONE,
    AP_CONDITION_NOMATCH,
    AP_CONDITION_WEAK,
    AP_CONDITION_STRONG
} ap_condition_e;
 
AP_DECLARE(ap_condition_e) ap_condition_if_match(request_rec *r,
        apr_table_t *headers);
 
AP_DECLARE(ap_condition_e) ap_condition_if_unmodified_since(request_rec *r,
        apr_table_t *headers);
 
AP_DECLARE(ap_condition_e) ap_condition_if_none_match(request_rec *r,
        apr_table_t *headers);
 
AP_DECLARE(ap_condition_e) ap_condition_if_modified_since(request_rec *r,
        apr_table_t *headers);
 
AP_DECLARE(ap_condition_e) ap_condition_if_range(request_rec *r,
        apr_table_t *headers);
 
AP_DECLARE(int) ap_meets_conditions(request_rec *r);
 
/* Other ways to send stuff at the client.  All of these keep track
 * of bytes_sent automatically.  This indirection is intended to make
 * it a little more painless to slide things like HTTP-NG packetization
 * underneath the main body of the code later.  In the meantime, it lets
 * us centralize a bit of accounting (bytes_sent).
 *
 * These also return the number of bytes written by the call.
 * They should only be called with a timeout registered, for obvious reaasons.
 * (Ditto the send_header stuff).
 */
 
AP_DECLARE(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);
 
#if APR_HAS_MMAP
AP_DECLARE(apr_size_t) ap_send_mmap(apr_mmap_t *mm,
                                    request_rec *r,
                                    apr_size_t offset,
                                    apr_size_t length);
#endif
 
 
AP_DECLARE(int) ap_method_register(apr_pool_t *p, const char *methname);
 
AP_DECLARE(void) ap_method_registry_init(apr_pool_t *p);
 
#define AP_METHOD_CHECK_ALLOWED(mask, methname) \
    ((mask) & (AP_METHOD_BIT << ap_method_number_of((methname))))
 
AP_DECLARE(ap_method_list_t *) ap_make_method_list(apr_pool_t *p, int nelts);
 
 
AP_DECLARE(void) ap_copy_method_list(ap_method_list_t *dest,
                                     ap_method_list_t *src);
 
AP_DECLARE(int) ap_method_in_list(ap_method_list_t *l, const char *method);
 
AP_DECLARE(void) ap_method_list_add(ap_method_list_t *l, const char *method);
 
AP_DECLARE(void) ap_method_list_remove(ap_method_list_t *l,
                                       const char *method);
 
AP_DECLARE(void) ap_clear_method_list(ap_method_list_t *l);
 
AP_DECLARE(void) ap_set_content_type(request_rec *r, const char *ct);
 
AP_DECLARE(void) ap_set_content_type_ex(request_rec *r, const char *ct, int trusted);
 
AP_DECLARE(void) ap_set_accept_ranges(request_rec *r);
 
 
/* Hmmm... could macrofy these for now, and maybe forever, though the
 * definitions of the macros would get a whole lot hairier.
 */
 
AP_DECLARE(int) ap_rputc(int c, request_rec *r);
 
AP_DECLARE(int) ap_rwrite(const void *buf, int nbyte, request_rec *r);
 
static APR_INLINE int ap_rputs(const char *str, request_rec *r)
{
    apr_size_t len;
 
    len = strlen(str);
 
    for (;;) {
        if (len <= INT_MAX) {
            return ap_rwrite(str, (int)len, r);
        }
        else {
            int rc;
 
            rc = ap_rwrite(str, INT_MAX, r);
            if (rc < 0) {
                return rc;
            }
            else {
                str += INT_MAX;
                len -= INT_MAX;
            }
        }
    }
}
 
AP_DECLARE_NONSTD(int) ap_rvputs(request_rec *r,...)
                       AP_FN_ATTR_SENTINEL;
 
AP_DECLARE(int) ap_vrprintf(request_rec *r, const char *fmt, va_list vlist);
 
AP_DECLARE_NONSTD(int) ap_rprintf(request_rec *r, const char *fmt,...)
                                __attribute__((format(printf,2,3)));
 
AP_DECLARE(int) ap_rflush(request_rec *r);
 
AP_DECLARE(int) ap_index_of_response(int status);
 
AP_DECLARE(const char *) ap_get_status_line(int status);
 
AP_DECLARE(const char *) ap_get_status_line_ex(apr_pool_t *p, int status);
 
/* Reading a block of data from the client connection (e.g., POST arg) */
 
AP_DECLARE(int) ap_setup_client_block(request_rec *r, int read_policy);
 
AP_DECLARE(int) ap_should_client_block(request_rec *r);
 
AP_DECLARE(long) ap_get_client_block(request_rec *r, char *buffer, apr_size_t bufsiz);
 
AP_DECLARE(int) ap_map_http_request_error(apr_status_t rv, int status);
 
AP_DECLARE(int) ap_discard_request_body(request_rec *r);
 
AP_DECLARE(void) ap_note_auth_failure(request_rec *r);
 
AP_DECLARE(void) ap_note_basic_auth_failure(request_rec *r);
 
AP_DECLARE(void) ap_note_digest_auth_failure(request_rec *r);
 
AP_DECLARE_HOOK(int, note_auth_failure, (request_rec *r, const char *auth_type))
 
AP_DECLARE(int) ap_get_basic_auth_pw(request_rec *r, const char **pw);
 
#define AP_GET_BASIC_AUTH_PW_NOTE "AP_GET_BASIC_AUTH_PW_NOTE"
 
AP_DECLARE(apr_status_t) ap_get_basic_auth_components(const request_rec *r,
                                                      const char **username,
                                                      const char **password);
 
AP_CORE_DECLARE(void) ap_parse_uri(request_rec *r, const char *uri);
 
#define AP_GETLINE_FOLD 1 /* Whether to merge continuation lines */
#define AP_GETLINE_CRLF 2 /* Whether line ends must be in the form CR LF */
#define AP_GETLINE_NOSPC_EOL 4 /* Whether to consume up to and including the
                                  end of line on APR_ENOSPC */
 
AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int flags);
 
#if APR_CHARSET_EBCDIC
AP_DECLARE(apr_status_t) ap_rgetline(char **s, apr_size_t n,
                                     apr_size_t *read,
                                     request_rec *r, int flags,
                                     apr_bucket_brigade *bb);
#else /* ASCII box */
#define ap_rgetline(s, n, read, r, fold, bb) \
        ap_rgetline_core((s), (n), (read), (r), (fold), (bb))
#endif
 
AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
                                          apr_size_t *read,
                                          request_rec *r, int flags,
                                          apr_bucket_brigade *bb);
 
AP_DECLARE(int) ap_method_number_of(const char *method);
 
AP_DECLARE(const char *) ap_method_name_of(apr_pool_t *p, int methnum);
 
 
/* Hooks */
/*
 * pre_read_request --- run right before read_request_line(),
 *                  and not run during any subrequests.
 */
AP_DECLARE_HOOK(void,pre_read_request,(request_rec *r, conn_rec *c))
 
/*
 * post_read_request --- run right after read_request or internal_redirect,
 *                  and not run during any subrequests.
 */
AP_DECLARE_HOOK(int,post_read_request,(request_rec *r))
 
 
AP_DECLARE_HOOK(int,log_transaction,(request_rec *r))
 
 
AP_DECLARE_HOOK(const char *,http_scheme,(const request_rec *r))
 
 
AP_DECLARE_HOOK(apr_port_t,default_port,(const request_rec *r))
 
 
#define AP_PROTOCOL_HTTP1        "http/1.1"
 
AP_DECLARE_HOOK(int,protocol_propose,(conn_rec *c, request_rec *r,
                                      server_rec *s,
                                      const apr_array_header_t *offers,
                                      apr_array_header_t *proposals))
 
 
AP_DECLARE_HOOK(int,protocol_switch,(conn_rec *c, request_rec *r,
                                     server_rec *s,
                                     const char *protocol))
 
 
AP_DECLARE_HOOK(const char *,protocol_get,(const conn_rec *c))
 
 
AP_DECLARE(apr_status_t) ap_get_protocol_upgrades(conn_rec *c, request_rec *r, 
                                                  server_rec *s, int report_all, 
                                                  const apr_array_header_t **pupgrades);
                                                  
AP_DECLARE(const char *) ap_select_protocol(conn_rec *c, request_rec *r, 
                                            server_rec *s,
                                            const apr_array_header_t *choices);
 
AP_DECLARE(apr_status_t) ap_switch_protocol(conn_rec *c, request_rec *r, 
                                            server_rec *s,
                                            const char *protocol);
 
AP_DECLARE(const char *) ap_get_protocol(conn_rec *c);
 
AP_DECLARE(int) ap_is_allowed_protocol(conn_rec *c, request_rec *r,
                                       server_rec *s, const char *protocol);
 
typedef struct ap_bucket_error ap_bucket_error;
 
struct ap_bucket_error {
    apr_bucket_refcount refcount;
    int status;
    const char    *data;
};
 
AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_error;
 
#define AP_BUCKET_IS_ERROR(e)         (e->type == &ap_bucket_type_error)
 
AP_DECLARE(apr_bucket *) ap_bucket_error_make(apr_bucket *b, int error,
                const char *buf, apr_pool_t *p);
 
AP_DECLARE(apr_bucket *) ap_bucket_error_create(int error, const char *buf,
                                                apr_pool_t *p,
                                                apr_bucket_alloc_t *list);
 
AP_DECLARE_NONSTD(apr_status_t) ap_byterange_filter(ap_filter_t *f, apr_bucket_brigade *b);
AP_DECLARE_NONSTD(apr_status_t) ap_http_header_filter(ap_filter_t *f, apr_bucket_brigade *b);
AP_DECLARE_NONSTD(apr_status_t) ap_content_length_filter(ap_filter_t *,
                                                              apr_bucket_brigade *);
AP_DECLARE_NONSTD(apr_status_t) ap_old_write_filter(ap_filter_t *f, apr_bucket_brigade *b);
 
AP_DECLARE(void) ap_set_sub_req_protocol(request_rec *rnew, const request_rec *r);
 
AP_DECLARE(void) ap_finalize_sub_req_protocol(request_rec *sub_r);
 
AP_DECLARE(void) ap_send_interim_response(request_rec *r, int send_headers);
 
 
 
#ifdef __cplusplus
}
#endif
 
#endif  /* !APACHE_HTTP_PROTOCOL_H */