This file is indexed.

/usr/include/apreq2/apreq_parser.h is in libapreq2-dev 2.13-1build2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
**  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 APREQ_PARSERS_H
#define APREQ_PARSERS_H
/* These structs are defined below */

#include "apreq_param.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @file apreq_parser.h
 * @brief Request body parser API
 * @ingroup libapreq2
 */

/**
 * A hook is called by the parser whenever data arrives in a file
 * upload parameter of the request body. You may associate any number
 * of hooks with a parser instance with apreq_parser_add_hook().
 */
typedef struct apreq_hook_t apreq_hook_t;

/**
 * A request body parser instance.
 */
typedef struct apreq_parser_t apreq_parser_t;

/** Parser arguments. */
#define APREQ_PARSER_ARGS  apreq_parser_t *parser,     \
                           apr_table_t *t,             \
                           apr_bucket_brigade *bb

/** Hook arguments */
#define APREQ_HOOK_ARGS    apreq_hook_t *hook,         \
                           apreq_param_t *param,       \
                           apr_bucket_brigade *bb

/**
 * The callback function implementing a request body parser.
 */
typedef apr_status_t (*apreq_parser_function_t)(APREQ_PARSER_ARGS);

/**
 * The callback function of a hook. See apreq_hook_t.
 */
typedef apr_status_t (*apreq_hook_function_t)(APREQ_HOOK_ARGS);

/**
 * Declares a API parser.
 */
#define APREQ_DECLARE_PARSER(f) APREQ_DECLARE_NONSTD(apr_status_t) \
                                (f) (APREQ_PARSER_ARGS)

/**
 * Declares an API hook.
 */
#define APREQ_DECLARE_HOOK(f)   APREQ_DECLARE_NONSTD(apr_status_t) \
                                (f) (APREQ_HOOK_ARGS)

/**
 * A hook is called by the parser whenever data arrives in a file
 * upload parameter of the request body. You may associate any number
 * of hooks with a parser instance with apreq_parser_add_hook().
 */
struct apreq_hook_t {
    apreq_hook_function_t hook; /**< the hook function */
    apreq_hook_t         *next; /**< next item in the linked list */
    apr_pool_t           *pool; /**< pool which allocated this hook */
    void *ctx; /**< a user defined pointer passed to the hook function */
};

/**
 * A request body parser instance.
 */
struct apreq_parser_t {
    /** the function which parses chunks of body data */
    apreq_parser_function_t parser;
    /** the Content-Type request header */
    const char             *content_type;
    /** a pool which outlasts the bucket_alloc. */
    apr_pool_t             *pool;
    /** bucket allocator used to create bucket brigades */
    apr_bucket_alloc_t     *bucket_alloc;
    /** the maximum in-memory bytes a brigade may use */
    apr_size_t              brigade_limit;
    /** the directory for generating temporary files */
    const char             *temp_dir;
    /** linked list of hooks */
    apreq_hook_t           *hook;
    /** internal context pointer used by the parser function */
    void                   *ctx;
};


/**
 * Parse the incoming brigade into a table.  Parsers normally
 * consume all the buckets of the brigade during parsing. However
 * parsers may leave "rejected" data in the brigade, even during a
 * successful parse, so callers may need to clean up the brigade
 * themselves (in particular, rejected buckets should not be
 * passed back to the parser again).
 * @remark  bb == NULL is valid: the parser should return its
 * public status: APR_INCOMPLETE, APR_SUCCESS, or an error code.
 */
static APR_INLINE
apr_status_t apreq_parser_run(struct apreq_parser_t *psr, apr_table_t *t,
                              apr_bucket_brigade *bb)
{
    return psr->parser(psr, t, bb);
}

/**
 * Run the hook with the current parameter and the incoming
 * bucket brigade.  The hook may modify the brigade if necessary.
 * Once all hooks have completed, the contents of the brigade will
 * be added to the parameter's bb attribute.
 * @return APR_SUCCESS on success. All other values represent errors.
 */
static APR_INLINE
apr_status_t apreq_hook_run(struct apreq_hook_t *h, apreq_param_t *param,
                            apr_bucket_brigade *bb)
{
    return h->hook(h, param, bb);
}


/**
 * RFC 822 Header parser. It will reject all data
 * after the first CRLF CRLF sequence (an empty line).
 * See apreq_parser_run() for more info on rejected data.
 */
APREQ_DECLARE_PARSER(apreq_parse_headers);

/**
 * RFC 2396 application/x-www-form-urlencoded parser.
 */
APREQ_DECLARE_PARSER(apreq_parse_urlencoded);

/**
 * RFC 2388 multipart/form-data (and XForms 1.0 multipart/related)
 * parser. It will reject any buckets representing preamble and
 * postamble text (this is normal behavior, not an error condition).
 * See apreq_parser_run() for more info on rejected data.
 */
APREQ_DECLARE_PARSER(apreq_parse_multipart);

/**
 * Generic parser.  No table entries will be added to
 * the req->body table by this parser.  The parser creates
 * a dummy apreq_param_t to pass to any configured hooks.  If
 * no hooks are configured, the dummy param's bb slot will
 * contain a copy of the request body.  It can be retrieved
 * by casting the parser's ctx pointer to (apreq_param_t **).
 */
APREQ_DECLARE_PARSER(apreq_parse_generic);

/**
 * apr_xml_parser hook. It will parse until EOS appears.
 * The parsed document isn't available until parsing has
 * completed successfully.  The hook's ctx pointer may
 * be cast as (apr_xml_doc **) to retrieve the
 * parsed document.
 */
APREQ_DECLARE_HOOK(apreq_hook_apr_xml_parser);

/**
 * Construct a parser.
 *
 * @param pool Pool used to allocate the parser.
 * @param ba bucket allocator used to create bucket brigades
 * @param content_type Content-type that this parser can deal with.
 * @param pfn The parser function.
 * @param brigade_limit the maximum in-memory bytes a brigade may use
 * @param temp_dir the directory used by the parser for temporary files
 * @param hook Hooks to associate this parser with.
 * @param ctx Parser's internal scratch pad.
 * @return New parser.
 */
APREQ_DECLARE(apreq_parser_t *) apreq_parser_make(apr_pool_t *pool,
                                                  apr_bucket_alloc_t *ba,
                                                  const char *content_type,
                                                  apreq_parser_function_t pfn,
                                                  apr_size_t brigade_limit,
                                                  const char *temp_dir,
                                                  apreq_hook_t *hook,
                                                  void *ctx);

/**
 * Construct a hook.
 *
 * @param pool used to allocate the hook.
 * @param hook The hook function.
 * @param next List of other hooks for this hook to call on.
 * @param ctx Hook's internal scratch pad.
 * @return New hook.
 */
APREQ_DECLARE(apreq_hook_t *) apreq_hook_make(apr_pool_t *pool,
                                              apreq_hook_function_t hook,
                                              apreq_hook_t *next,
                                              void *ctx);


/**
 * Add a new hook to the end of the parser's hook list.
 *
 * @param p Parser.
 * @param h Hook to append.
 */
APREQ_DECLARE(apr_status_t) apreq_parser_add_hook(apreq_parser_t *p,
                                                  apreq_hook_t *h);


/**
 * Fetch the default parser function associated with the given MIME type.
 * @param enctype The desired enctype (can also be a full "Content-Type"
 *        header).
 * @return The parser function, or NULL if the enctype is unrecognized.
 */
APREQ_DECLARE(apreq_parser_function_t)apreq_parser(const char *enctype);


/**
 * Register a new parsing function with a MIME enctype.
 * Registered parsers are added to apreq_parser()'s
 * internal lookup table.
 *
 * @param enctype The MIME type.
 * @param pfn     The function to use during parsing. Setting
 *                parser == NULL will remove an existing parser.
 *
 * @return APR_SUCCESS or error.
 */

APREQ_DECLARE(apr_status_t) apreq_register_parser(const char *enctype,
                                                  apreq_parser_function_t pfn);


/**
 * Returns APREQ_ERROR_GENERAL.  Effectively disables mfd parser
 * if a file-upload field is present.
 *
 */
APREQ_DECLARE_HOOK(apreq_hook_disable_uploads);

/**
 * Calls apr_brigade_cleanup on the incoming brigade
 * after passing the brigade to any subsequent hooks.
 */
APREQ_DECLARE_HOOK(apreq_hook_discard_brigade);

/**
 * Context struct for the apreq_hook_find_param hook.
 */
typedef struct apreq_hook_find_param_ctx_t {
    const char    *name;
    apreq_param_t *param;
    apreq_hook_t  *prev;
} apreq_hook_find_param_ctx_t;


/**
 * Special purpose utility for locating a parameter
 * during parsing.  The hook's ctx shoud be initialized
 * to an apreq_hook_find_param_ctx_t *, with the name
 * attribute set to the sought parameter name, the param
 * attribute set to NULL, and the prev attribute set to
 * the address of the previous hook.  The param attribute
 * will be reassigned to the first param found, and once
 * that happens this hook is immediately removed from the chain.
 *
 * @remarks When used, this should always be the first hook
 * invoked, so add it manually with ctx->prev = &parser->hook
 * instead of using apreq_parser_add_hook.
 */
APREQ_DECLARE_HOOK(apreq_hook_find_param);


#ifdef __cplusplus
}

#endif
#endif /* APREQ_PARSERS_H */