Edit File: http_core.h
/* 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. */ /** * @file http_core.h * @brief CORE HTTP Daemon * * @defgroup APACHE_CORE_HTTPD Core HTTP Daemon * @ingroup APACHE_CORE * @{ */ #ifndef APACHE_HTTP_CORE_H #define APACHE_HTTP_CORE_H #include "apr.h" #include "apr_hash.h" #include "apr_optional.h" #include "util_filter.h" #if APR_HAVE_STRUCT_RLIMIT #include <sys/time.h> #include <sys/resource.h> #endif #ifdef __cplusplus extern "C" { #endif /* **************************************************************** * * The most basic server code is encapsulated in a single module * known as the core, which is just *barely* functional enough to * serve documents, though not terribly well. * * Largely for NCSA back-compatibility reasons, the core needs to * make pieces of its config structures available to other modules. * The accessors are declared here, along with the interpretation * of one of them (allow_options). */ /** * @defgroup APACHE_CORE_HTTPD_ACESSORS Acessors * * @brief File/Directory Accessor directives * * @{ */ /** No directives */ #define OPT_NONE 0 /** Indexes directive */ #define OPT_INDEXES 1 /** SSI is enabled without exec= permission */ #define OPT_INCLUDES 2 /** FollowSymLinks directive */ #define OPT_SYM_LINKS 4 /** ExecCGI directive */ #define OPT_EXECCGI 8 /** directive unset */ #define OPT_UNSET 16 /** IncludesNOEXEC directive */ #define OPT_INCNOEXEC 32 /** SymLinksIfOwnerMatch directive */ #define OPT_SYM_OWNER 64 /** MultiViews directive */ #define OPT_MULTI 128 /** All directives */ #define OPT_ALL (OPT_INDEXES|OPT_INCLUDES|OPT_INCNOEXEC|OPT_SYM_LINKS|OPT_EXECCGI) /** @} */ #ifdef CORE_PRIVATE /* For internal use only - since 2.2.12, the OPT_INCNOEXEC bit is * internally replaced by OPT_INC_WITH_EXEC. The internal semantics * of the two SSI-related bits are hence: * * OPT_INCLUDES => "enable SSI, without exec= permission" * OPT_INC_WITH_EXEC => "iff OPT_INCLUDES is set, also enable exec=" * * The set of options exposed via ap_allow_options() retains the * semantics of OPT_INCNOEXEC by flipping the bit. */ #define OPT_INC_WITH_EXEC OPT_INCNOEXEC #endif /** * @defgroup get_remote_host Remote Host Resolution * @ingroup APACHE_CORE_HTTPD * @{ */ /** REMOTE_HOST returns the hostname, or NULL if the hostname * lookup fails. It will force a DNS lookup according to the * HostnameLookups setting. */ #define REMOTE_HOST (0) /** REMOTE_NAME returns the hostname, or the dotted quad if the * hostname lookup fails. It will force a DNS lookup according * to the HostnameLookups setting. */ #define REMOTE_NAME (1) /** REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is * never forced. */ #define REMOTE_NOLOOKUP (2) /** REMOTE_DOUBLE_REV will always force a DNS lookup, and also force * a double reverse lookup, regardless of the HostnameLookups * setting. The result is the (double reverse checked) hostname, * or NULL if any of the lookups fail. */ #define REMOTE_DOUBLE_REV (3) /** @} // get_remote_host */ /** all of the requirements must be met */ #define SATISFY_ALL 0 /** any of the requirements must be met */ #define SATISFY_ANY 1 /** There are no applicable satisfy lines */ #define SATISFY_NOSPEC 2 /** Make sure we don't write less than 8000 bytes at any one time. */ #define AP_MIN_BYTES_TO_WRITE 8000 /** default maximum of internal redirects */ # define AP_DEFAULT_MAX_INTERNAL_REDIRECTS 10 /** default maximum subrequest nesting level */ # define AP_DEFAULT_MAX_SUBREQ_DEPTH 10 /** * Retrieve the value of Options for this request * @param r The current request * @return the Options bitmask */ AP_DECLARE(int) ap_allow_options(request_rec *r); /** * Retrieve the value of the AllowOverride for this request * @param r The current request * @return the overrides bitmask */ AP_DECLARE(int) ap_allow_overrides(request_rec *r); /** * Retrieve the value of the DefaultType directive, or text/plain if not set * @param r The current request * @return The default type */ AP_DECLARE(const char *) ap_default_type(request_rec *r); /** * Retrieve the document root for this server * @param r The current request * @warning Don't use this! If your request went through a Userdir, or * something like that, it'll screw you. But it's back-compatible... * @return The document root */ AP_DECLARE(const char *) ap_document_root(request_rec *r); /** * Lookup the remote client's DNS name or IP address * @ingroup get_remote_host * @param conn The current connection * @param dir_config The directory config vector from the request * @param type The type of lookup to perform. One of: * <pre> * REMOTE_HOST returns the hostname, or NULL if the hostname * lookup fails. It will force a DNS lookup according to the * HostnameLookups setting. * REMOTE_NAME returns the hostname, or the dotted quad if the * hostname lookup fails. It will force a DNS lookup according * to the HostnameLookups setting. * REMOTE_NOLOOKUP is like REMOTE_NAME except that a DNS lookup is * never forced. * REMOTE_DOUBLE_REV will always force a DNS lookup, and also force * a double reverse lookup, regardless of the HostnameLookups * setting. The result is the (double reverse checked) * hostname, or NULL if any of the lookups fail. * </pre> * @param str_is_ip unless NULL is passed, this will be set to non-zero on output when an IP address * string is returned * @return The remote hostname */ AP_DECLARE(const char *) ap_get_remote_host(conn_rec *conn, void *dir_config, int type, int *str_is_ip); /** * Retrieve the login name of the remote user. Undef if it could not be * determined * @param r The current request * @return The user logged in to the client machine */ AP_DECLARE(const char *) ap_get_remote_logname(request_rec *r); /* Used for constructing self-referencing URLs, and things like SERVER_PORT, * and SERVER_NAME. */ /** * build a fully qualified URL from the uri and information in the request rec * @param p The pool to allocate the URL from * @param uri The path to the requested file * @param r The current request * @return A fully qualified URL */ AP_DECLARE(char *) ap_construct_url(apr_pool_t *p, const char *uri, request_rec *r); /** * Get the current server name from the request * @param r The current request * @return the server name */ AP_DECLARE(const char *) ap_get_server_name(request_rec *r); /** * Get the current server port * @param r The current request * @return The server's port */ AP_DECLARE(apr_port_t) ap_get_server_port(const request_rec *r); /** * Return the limit on bytes in request msg body * @param r The current request * @return the maximum number of bytes in the request msg body */ AP_DECLARE(apr_off_t) ap_get_limit_req_body(const request_rec *r); /** * Return the limit on bytes in XML request msg body * @param r The current request * @return the maximum number of bytes in XML request msg body */ AP_DECLARE(size_t) ap_get_limit_xml_body(const request_rec *r); /** * Install a custom response handler for a given status * @param r The current request * @param status The status for which the custom response should be used * @param string The custom response. This can be a static string, a file * or a URL */ AP_DECLARE(void) ap_custom_response(request_rec *r, int status, const char *string); /** * Check if the current request is beyond the configured max. number of redirects or subrequests * @param r The current request * @return true (is exceeded) or false */ AP_DECLARE(int) ap_is_recursion_limit_exceeded(const request_rec *r); /** * Check for a definition from the server command line * @param name The define to check for * @return 1 if defined, 0 otherwise */ AP_DECLARE(int) ap_exists_config_define(const char *name); /* FIXME! See STATUS about how */ AP_DECLARE_NONSTD(int) ap_core_translate(request_rec *r); /* Authentication stuff. This is one of the places where compatibility * with the old config files *really* hurts; they don't discriminate at * all between different authentication schemes, meaning that we need * to maintain common state for all of them in the core, and make it * available to the other modules through interfaces. */ /** @see require_line */ typedef struct require_line require_line; /** * @brief A structure to keep track of authorization requirements */ struct require_line { /** Where the require line is in the config file. */ apr_int64_t method_mask; /** The complete string from the command line */ char *requirement; }; /** * Return the type of authorization required for this request * @param r The current request * @return The authorization required */ AP_DECLARE(const char *) ap_auth_type(request_rec *r); /** * Return the current Authorization realm * @param r The current request * @return The current authorization realm */ AP_DECLARE(const char *) ap_auth_name(request_rec *r); /** * How the requires lines must be met. * @param r The current request * @return How the requirements must be met. One of: * <pre> * SATISFY_ANY -- any of the requirements must be met. * SATISFY_ALL -- all of the requirements must be met. * SATISFY_NOSPEC -- There are no applicable satisfy lines * </pre> */ AP_DECLARE(int) ap_satisfies(request_rec *r); /** * Retrieve information about all of the requires directives for this request * @param r The current request * @return An array of all requires directives for this request */ AP_DECLARE(const apr_array_header_t *) ap_requires(request_rec *r); #ifdef CORE_PRIVATE /** * Core is also unlike other modules in being implemented in more than * one file... so, data structures are declared here, even though most of * the code that cares really is in http_core.c. Also, another accessor. */ AP_DECLARE_DATA extern module core_module; /** * @brief Per-request configuration */ typedef struct { /** bucket brigade used by getline for look-ahead and * ap_get_client_block for holding left-over request body */ struct apr_bucket_brigade *bb; /** an array of per-request working data elements, accessed * by ID using ap_get_request_note() * (Use ap_register_request_note() during initialization * to add elements) */ void **notes; /** There is a script processor installed on the output filter chain, * so it needs the default_handler to deliver a (script) file into * the chain so it can process it. Normally, default_handler only * serves files on a GET request (assuming the file is actual content), * since other methods are not content-retrieval. This flag overrides * that behavior, stating that the "content" is actually a script and * won't actually be delivered as the response for the non-GET method. */ int deliver_script; /** Custom response strings registered via ap_custom_response(), * or NULL; check per-dir config if nothing found here */ char **response_code_strings; /* from ap_custom_response(), not from * ErrorDocument */ /** Should addition of charset= be suppressed for this request? */ int suppress_charset; } core_request_config; /* Standard entries that are guaranteed to be accessible via * ap_get_request_note() for each request (additional entries * can be added with ap_register_request_note()) */ #define AP_NOTE_DIRECTORY_WALK 0 #define AP_NOTE_LOCATION_WALK 1 #define AP_NOTE_FILE_WALK 2 #define AP_NUM_STD_NOTES 3 /** * Reserve an element in the core_request_config->notes array * for some application-specific data * @return An integer key that can be passed to ap_get_request_note() * during request processing to access this element for the * current request. */ AP_DECLARE(apr_size_t) ap_register_request_note(void); /** * Retrieve a pointer to an element in the core_request_config->notes array * @param r The request * @param note_num A key for the element: either a value obtained from * ap_register_request_note() or one of the predefined AP_NOTE_* * values. * @return NULL if the note_num is invalid, otherwise a pointer to the * requested note element. * @remark At the start of a request, each note element is NULL. The * handle provided by ap_get_request_note() is a pointer-to-pointer * so that the caller can point the element to some app-specific * data structure. The caller should guarantee that any such * structure will last as long as the request itself. */ AP_DECLARE(void **) ap_get_request_note(request_rec *r, apr_size_t note_num); typedef unsigned char allow_options_t; typedef unsigned char overrides_t; /* * Bits of info that go into making an ETag for a file * document. Why a long? Because char historically * proved too short for Options, and int can be different * sizes on different platforms. */ typedef unsigned long etag_components_t; #define ETAG_UNSET 0 #define ETAG_NONE (1 << 0) #define ETAG_MTIME (1 << 1) #define ETAG_INODE (1 << 2) #define ETAG_SIZE (1 << 3) #define ETAG_BACKWARD (ETAG_MTIME | ETAG_INODE | ETAG_SIZE) #define ETAG_ALL (ETAG_MTIME | ETAG_INODE | ETAG_SIZE) /** * @brief Server Signature Enumeration */ typedef enum { srv_sig_unset, srv_sig_off, srv_sig_on, srv_sig_withmail } server_signature_e; /** * @brief Per-directory configuration */ typedef struct { /** path of the directory/regex/etc. see also d_is_fnmatch/absolute below */ char *d; /** the number of slashes in d */ unsigned d_components; /** If (opts & OPT_UNSET) then no absolute assignment to options has * been made. * invariant: (opts_add & opts_remove) == 0 * Which said another way means that the last relative (options + or -) * assignment made to each bit is recorded in exactly one of opts_add * or opts_remove. */ allow_options_t opts; allow_options_t opts_add; allow_options_t opts_remove; overrides_t override; allow_options_t override_opts; /* MIME typing --- the core doesn't do anything at all with this, * but it does know what to slap on a request for a document which * goes untyped by other mechanisms before it slips out the door... */ char *ap_default_type; /* Authentication stuff. Groan... */ int *satisfy; /* for every method one */ char *ap_auth_type; char *ap_auth_name; apr_array_header_t *ap_requires; /* Custom response config. These can contain text or a URL to redirect to. * if response_code_strings is NULL then there are none in the config, * if it's not null then it's allocated to sizeof(char*)*RESPONSE_CODES. * This lets us do quick merges in merge_core_dir_configs(). */ char **response_code_strings; /* from ErrorDocument, not from * ap_custom_response() */ /* Hostname resolution etc */ #define HOSTNAME_LOOKUP_OFF 0 #define HOSTNAME_LOOKUP_ON 1 #define HOSTNAME_LOOKUP_DOUBLE 2 #define HOSTNAME_LOOKUP_UNSET 3 unsigned int hostname_lookups : 4; signed int content_md5 : 2; /* calculate Content-MD5? */ #define USE_CANONICAL_NAME_OFF (0) #define USE_CANONICAL_NAME_ON (1) #define USE_CANONICAL_NAME_DNS (2) #define USE_CANONICAL_NAME_UNSET (3) unsigned use_canonical_name : 2; /* since is_fnmatch(conf->d) was being called so frequently in * directory_walk() and its relatives, this field was created and * is set to the result of that call. */ unsigned d_is_fnmatch : 1; /* should we force a charset on any outgoing parameterless content-type? * if so, which charset? */ #define ADD_DEFAULT_CHARSET_OFF (0) #define ADD_DEFAULT_CHARSET_ON (1) #define ADD_DEFAULT_CHARSET_UNSET (2) unsigned add_default_charset : 2; const char *add_default_charset_name; /* System Resource Control */ #ifdef RLIMIT_CPU struct rlimit *limit_cpu; #endif #if defined (RLIMIT_DATA) || defined (RLIMIT_VMEM) || defined(RLIMIT_AS) struct rlimit *limit_mem; #endif #ifdef RLIMIT_NPROC struct rlimit *limit_nproc; #endif apr_off_t limit_req_body; /* limit on bytes in request msg body */ long limit_xml_body; /* limit on bytes in XML request msg body */ /* logging options */ server_signature_e server_signature; int loglevel; /* Access control */ apr_array_header_t *sec_file; ap_regex_t *r; const char *mime_type; /* forced with ForceType */ const char *handler; /* forced with SetHandler */ const char *output_filters; /* forced with SetOutputFilters */ const char *input_filters; /* forced with SetInputFilters */ int accept_path_info; /* forced with AcceptPathInfo */ apr_hash_t *ct_output_filters; /* added with AddOutputFilterByType */ /* * What attributes/data should be included in ETag generation? */ etag_components_t etag_bits; etag_components_t etag_add; etag_components_t etag_remove; /* * Run-time performance tuning */ #define ENABLE_MMAP_OFF (0) #define ENABLE_MMAP_ON (1) #define ENABLE_MMAP_UNSET (2) unsigned int enable_mmap : 2; /* whether files in this dir can be mmap'ed */ #define ENABLE_SENDFILE_OFF (0) #define ENABLE_SENDFILE_ON (1) #define ENABLE_SENDFILE_UNSET (2) unsigned int enable_sendfile : 2; /* files in this dir can be mmap'ed */ unsigned int allow_encoded_slashes : 1; /* URLs may contain %2f w/o being * pitched indiscriminately */ #define USE_CANONICAL_PHYS_PORT_OFF (0) #define USE_CANONICAL_PHYS_PORT_ON (1) #define USE_CANONICAL_PHYS_PORT_UNSET (2) unsigned use_canonical_phys_port : 2; unsigned int decode_encoded_slashes : 1; /* whether to decode encoded slashes in URLs */ #define AP_MAXRANGES_UNSET -1 #define AP_MAXRANGES_DEFAULT -2 #define AP_MAXRANGES_UNLIMITED -3 #define AP_MAXRANGES_NORANGES 0 /** Number of Ranges before returning HTTP_OK. **/ int max_ranges; } core_dir_config; /* Per-server core configuration */ typedef struct { #ifdef GPROF char *gprof_dir; #endif /* Name translations --- we want the core to be able to do *something* * so it's at least a minimally functional web server on its own (and * can be tested that way). But let's keep it to the bare minimum: */ const char *ap_document_root; /* Access control */ char *access_name; apr_array_header_t *sec_dir; apr_array_header_t *sec_url; /* recursion backstopper */ int redirect_limit; /* maximum number of internal redirects */ int subreq_limit; /* maximum nesting level of subrequests */ const char *protocol; apr_table_t *accf_map; /* TRACE control */ #define AP_TRACE_UNSET -1 #define AP_TRACE_DISABLE 0 #define AP_TRACE_ENABLE 1 #define AP_TRACE_EXTENDED 2 int trace_enable; #define AP_MERGE_TRAILERS_UNSET 0 #define AP_MERGE_TRAILERS_ENABLE 1 #define AP_MERGE_TRAILERS_DISABLE 2 int merge_trailers; } core_server_config; /* for AddOutputFiltersByType in core.c */ void ap_add_output_filters_by_type(request_rec *r); /* for http_config.c */ void ap_core_reorder_directories(apr_pool_t *, server_rec *); /* for mod_perl */ AP_CORE_DECLARE(void) ap_add_per_dir_conf(server_rec *s, void *dir_config); AP_CORE_DECLARE(void) ap_add_per_url_conf(server_rec *s, void *url_config); AP_CORE_DECLARE(void) ap_add_file_conf(core_dir_config *conf, void *url_config); AP_CORE_DECLARE_NONSTD(const char *) ap_limit_section(cmd_parms *cmd, void *dummy, const char *arg); /* Core filters; not exported. */ int ap_core_input_filter(ap_filter_t *f, apr_bucket_brigade *b, ap_input_mode_t mode, apr_read_type_e block, apr_off_t readbytes); apr_status_t ap_core_output_filter(ap_filter_t *f, apr_bucket_brigade *b); #endif /* CORE_PRIVATE */ AP_DECLARE(const char*) ap_get_server_protocol(server_rec* s); AP_DECLARE(void) ap_set_server_protocol(server_rec* s, const char* proto); /* ---------------------------------------------------------------------- * * Runtime status/management */ typedef enum { ap_mgmt_type_string, ap_mgmt_type_long, ap_mgmt_type_hash } ap_mgmt_type_e; typedef union { const char *s_value; long i_value; apr_hash_t *h_value; } ap_mgmt_value; typedef struct { const char *description; const char *name; ap_mgmt_type_e vtype; ap_mgmt_value v; } ap_mgmt_item_t; /* Handles for core filters */ extern AP_DECLARE_DATA ap_filter_rec_t *ap_subreq_core_filter_handle; extern AP_DECLARE_DATA ap_filter_rec_t *ap_core_output_filter_handle; extern AP_DECLARE_DATA ap_filter_rec_t *ap_content_length_filter_handle; extern AP_DECLARE_DATA ap_filter_rec_t *ap_core_input_filter_handle; /** * This hook provdes a way for modules to provide metrics/statistics about * their operational status. * * @param p A pool to use to create entries in the hash table * @param val The name of the parameter(s) that is wanted. This is * tree-structured would be in the form ('*' is all the tree, * 'module.*' all of the module , 'module.foo.*', or * 'module.foo.bar' ) * @param ht The hash table to store the results. Keys are item names, and * the values point to ap_mgmt_item_t structures. * @ingroup hooks */ AP_DECLARE_HOOK(int, get_mgmt_items, (apr_pool_t *p, const char * val, apr_hash_t *ht)) /* ---------------------------------------------------------------------- */ /* ---------------------------------------------------------------------- * * I/O logging with mod_logio */ APR_DECLARE_OPTIONAL_FN(void, ap_logio_add_bytes_out, (conn_rec *c, apr_off_t bytes)); APR_DECLARE_OPTIONAL_FN(void, ap_logio_add_bytes_in, (conn_rec *c, apr_off_t bytes)); /* ---------------------------------------------------------------------- * * ident lookups with mod_ident */ APR_DECLARE_OPTIONAL_FN(const char *, ap_ident_lookup, (request_rec *r)); /* ---------------------------------------------------------------------- */ #ifdef __cplusplus } #endif #endif /* !APACHE_HTTP_CORE_H */ /** @} */
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