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| -rw-r--r-- | include/util_fcgi.h | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/include/util_fcgi.h b/include/util_fcgi.h new file mode 100644 index 0000000..66af75a --- /dev/null +++ b/include/util_fcgi.h @@ -0,0 +1,280 @@ +/* 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 util_fcgi.h + * @brief FastCGI protocol definitions and support routines + * + * @defgroup APACHE_CORE_FASTCGI FastCGI Tools + * @ingroup APACHE_CORE + * @{ + */ + +#ifndef APACHE_UTIL_FCGI_H +#define APACHE_UTIL_FCGI_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include "httpd.h" + +/** + * @brief A structure that represents the fixed header fields + * at the beginning of a "FastCGI record" (i.e., the data prior + * to content data and padding). + */ +typedef struct { + /** See values for version, below */ + unsigned char version; + /** See values for type, below */ + unsigned char type; + /** request id, in two parts */ + unsigned char requestIdB1; + unsigned char requestIdB0; + /** content length, in two parts */ + unsigned char contentLengthB1; + unsigned char contentLengthB0; + /** padding length */ + unsigned char paddingLength; + /** 8-bit reserved field */ + unsigned char reserved; +} ap_fcgi_header; + +/* + * Number of bytes in the header portion of a FastCGI record + * (i.e., ap_fcgi_header structure). Future versions of the + * protocol may increase the size. + */ +#define AP_FCGI_HEADER_LEN 8 + +/* + * Maximum number of bytes in the content portion of a FastCGI record. + */ +#define AP_FCGI_MAX_CONTENT_LEN 65535 + +/** + * Possible values for the version field of ap_fcgi_header + */ +#define AP_FCGI_VERSION_1 1 + +/** + * Possible values for the type field of ap_fcgi_header + */ +#define AP_FCGI_BEGIN_REQUEST 1 +#define AP_FCGI_ABORT_REQUEST 2 +#define AP_FCGI_END_REQUEST 3 +#define AP_FCGI_PARAMS 4 +#define AP_FCGI_STDIN 5 +#define AP_FCGI_STDOUT 6 +#define AP_FCGI_STDERR 7 +#define AP_FCGI_DATA 8 +#define AP_FCGI_GET_VALUES 9 +#define AP_FCGI_GET_VALUES_RESULT 10 +#define AP_FCGI_UNKNOWN_TYPE 11 +#define AP_FCGI_MAXTYPE (AP_FCGI_UNKNOWN_TYPE) + +/** + * Offsets of the various fields of ap_fcgi_header + */ +#define AP_FCGI_HDR_VERSION_OFFSET 0 +#define AP_FCGI_HDR_TYPE_OFFSET 1 +#define AP_FCGI_HDR_REQUEST_ID_B1_OFFSET 2 +#define AP_FCGI_HDR_REQUEST_ID_B0_OFFSET 3 +#define AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET 4 +#define AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET 5 +#define AP_FCGI_HDR_PADDING_LEN_OFFSET 6 +#define AP_FCGI_HDR_RESERVED_OFFSET 7 + +/** + * @brief This represents the content data of the FastCGI record when + * the type is AP_FCGI_BEGIN_REQUEST. + */ +typedef struct { + /** + * role, in two parts + * See values for role, below + */ + unsigned char roleB1; + unsigned char roleB0; + /** + * flags + * See values for flags bits, below + */ + unsigned char flags; + /** reserved */ + unsigned char reserved[5]; +} ap_fcgi_begin_request_body; + +/* + * Values for role component of ap_fcgi_begin_request_body + */ +#define AP_FCGI_RESPONDER 1 +#define AP_FCGI_AUTHORIZER 2 +#define AP_FCGI_FILTER 3 + +/* + * Values for flags bits of ap_fcgi_begin_request_body + */ +#define AP_FCGI_KEEP_CONN 1 /* otherwise the application closes */ + +/** + * Offsets of the various fields of ap_fcgi_begin_request_body + */ +#define AP_FCGI_BRB_ROLEB1_OFFSET 0 +#define AP_FCGI_BRB_ROLEB0_OFFSET 1 +#define AP_FCGI_BRB_FLAGS_OFFSET 2 +#define AP_FCGI_BRB_RESERVED0_OFFSET 3 +#define AP_FCGI_BRB_RESERVED1_OFFSET 4 +#define AP_FCGI_BRB_RESERVED2_OFFSET 5 +#define AP_FCGI_BRB_RESERVED3_OFFSET 6 +#define AP_FCGI_BRB_RESERVED4_OFFSET 7 + +/** + * Pack ap_fcgi_header + * @param h The header to read from + * @param a The array to write to, of size AP_FCGI_HEADER_LEN + */ +AP_DECLARE(void) ap_fcgi_header_to_array(ap_fcgi_header *h, + unsigned char a[]); + +/** + * Unpack header of FastCGI record into ap_fcgi_header + * @param h The header to write to + * @param a The array to read from, of size AP_FCGI_HEADER_LEN + */ +AP_DECLARE(void) ap_fcgi_header_from_array(ap_fcgi_header *h, + unsigned char a[]); + +/** + * Unpack header of FastCGI record into individual fields + * @param version The version, on output + * @param type The type, on output + * @param request_id The request id, on output + * @param content_len The content length, on output + * @param padding_len The amount of padding following the content, on output + * @param a The array to read from, of size AP_FCGI_HEADER_LEN + */ +AP_DECLARE(void) ap_fcgi_header_fields_from_array(unsigned char *version, + unsigned char *type, + apr_uint16_t *request_id, + apr_uint16_t *content_len, + unsigned char *padding_len, + unsigned char a[]); + +/** + * Pack ap_fcgi_begin_request_body + * @param h The begin-request body to read from + * @param a The array to write to, of size AP_FCGI_HEADER_LEN + */ +AP_DECLARE(void) ap_fcgi_begin_request_body_to_array(ap_fcgi_begin_request_body *h, + unsigned char a[]); + +/** + * Fill in a FastCGI request header with the required field values. + * @param header The header to fill in + * @param type The type of record + * @param request_id The request id + * @param content_len The amount of content which follows the header + * @param padding_len The amount of padding which follows the content + * + * The header array must be at least AP_FCGI_HEADER_LEN bytes long. + */ +AP_DECLARE(void) ap_fcgi_fill_in_header(ap_fcgi_header *header, + unsigned char type, + apr_uint16_t request_id, + apr_uint16_t content_len, + unsigned char padding_len); + +/** + * Fill in a FastCGI begin request body with the required field values. + * @param brb The begin-request-body to fill in + * @param role AP_FCGI_RESPONDER or other roles + * @param flags 0 or a combination of flags like AP_FCGI_KEEP_CONN + */ +AP_DECLARE(void) ap_fcgi_fill_in_request_body(ap_fcgi_begin_request_body *brb, + int role, + unsigned char flags); + +/** + * Compute the buffer size needed to encode the next portion of + * the provided environment table. + * @param env The environment table + * @param maxlen The maximum buffer size allowable, capped at + * AP_FCGI_MAX_CONTENT_LEN. + * @param starting_elem On input, the next element of the table array + * to process in this FastCGI record. On output, the next element to + * process on the *next* FastCGI record. + * @return Size of buffer needed to encode the next part, or 0 + * if no more can be encoded. When 0 is returned: If starting_elem + * has reached the end of the table array, all has been encoded; + * otherwise, the next envvar can't be encoded within the specified + * limit. + * @note If an envvar can't be encoded within the specified limit, + * the caller can log a warning and increment starting_elem and try + * again or increase the limit or fail, as appropriate for the module. + */ +AP_DECLARE(apr_size_t) ap_fcgi_encoded_env_len(apr_table_t *env, + apr_size_t maxlen, + int *starting_elem); + +/** + * Encode the next portion of the provided environment table using + * a buffer previously allocated. + * @param r The request, for logging + * @param env The environment table + * @param buffer A buffer to contain the encoded environment table + * @param buflen The length of the buffer, previously computed by + * ap_fcgi_encoded_env_len(). + * @param starting_elem On input, the next element of the table array + * to process in this FastCGI record. On output, the next element to + * process on the *next* FastCGI record. + * @return APR_SUCCESS if a section could be encoded or APR_ENOSPC + * otherwise. + * @note The output starting_elem from ap_fcgi_encoded_env_len + * shouldn't be used as input to ap_fcgi_encode_env when building the + * same FastCGI record. + */ +AP_DECLARE(apr_status_t) ap_fcgi_encode_env(request_rec *r, + apr_table_t *env, + void *buffer, + apr_size_t buflen, + int *starting_elem); + +/** + * String forms for the value of the FCGI_ROLE envvar + */ +#define AP_FCGI_RESPONDER_STR "RESPONDER" +#define AP_FCGI_AUTHORIZER_STR "AUTHORIZER" +#define AP_FCGI_FILTER_STR "FILTER" + +/** + * FastCGI implementations that implement the AUTHORIZER role + * for Apache httpd and allow the application to participate in + * any of the Apache httpd AAA phases typically set the variable + * FCGI_APACHE_ROLE to one of these strings to indicate the + * specific AAA phase. + */ +#define AP_FCGI_APACHE_ROLE_AUTHENTICATOR_STR "AUTHENTICATOR" +#define AP_FCGI_APACHE_ROLE_AUTHORIZER_STR "AUTHORIZER" +#define AP_FCGI_APACHE_ROLE_ACCESS_CHECKER_STR "ACCESS_CHECKER" + +#ifdef __cplusplus +} +#endif + +#endif /* !APACHE_UTIL_FCGI_H */ +/** @} */ |