1 /******************************************************************************/
2 /* pfixtools: a collection of postfix related tools */
4 /* ________________________________________________________________________ */
6 /* Redistribution and use in source and binary forms, with or without */
7 /* modification, are permitted provided that the following conditions */
10 /* 1. Redistributions of source code must retain the above copyright */
11 /* notice, this list of conditions and the following disclaimer. */
12 /* 2. Redistributions in binary form must reproduce the above copyright */
13 /* notice, this list of conditions and the following disclaimer in the */
14 /* documentation and/or other materials provided with the distribution. */
15 /* 3. The names of its contributors may not be used to endorse or promote */
16 /* products derived from this software without specific prior written */
19 /* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
20 /* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
21 /* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
22 /* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
23 /* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
24 /* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
25 /* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
26 /* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
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29 /* THE POSSIBILITY OF SUCH DAMAGE. */
30 /******************************************************************************/
33 * Copyright © 2008 Florent Bruneau
36 #ifndef PFIXTOOLS_FILTER_H
37 #define PFIXTOOLS_FILTER_H
40 #include "filter_tokens.h"
41 #include "hook_tokens.h"
42 #include "param_tokens.h"
46 typedef filter_token filter_type_t;
47 typedef hook_token filter_result_t;
48 typedef param_token filter_param_id_t;
50 typedef struct filter_hook_t {
60 typedef struct filter_param_t {
61 filter_param_id_t type;
67 /** Description of a filter.
69 typedef struct filter_t {
73 A(filter_hook_t) hooks;
76 A(filter_param_t) params;
78 /* Loop checking flags.
84 /** Context of the query. To be filled with data to use when
85 * performing asynchronous filtering.
87 typedef struct filter_context_t {
88 const filter_t *current_filter;
89 void *contexts[FTK_count];
95 #define FILTER_INIT { NULL, FTK_UNKNOWN, ARRAY_INIT, NULL, ARRAY_INIT, -1 }
96 #define CHECK_FILTER(Filter) \
97 assert(Filter != FTK_UNKNOWN && Filter != FTK_count \
98 && "Unknown filter type")
99 #define CHECK_HOOK(Hook) \
100 assert(Hook != HTK_UNKNOWN && Hook != HTK_count \
102 #define CHECK_PARAM(Param) \
103 assert(Param != ATK_UNKNOWN && Param != ATK_count \
107 /* Callback to be implemented by a filter.
110 typedef filter_result_t (*filter_runner_t)(const filter_t *filter,
111 const query_t *query,
112 filter_context_t *context);
113 typedef bool (*filter_constructor_t)(filter_t *filter);
114 typedef void (*filter_destructor_t)(filter_t *filter);
116 typedef void *(*filter_context_constructor_t)(void);
117 typedef void (*filter_context_destructor_t)(void*);
123 __attribute__((nonnull(1,4)))
124 filter_type_t filter_register(const char *type, filter_constructor_t constructor,
125 filter_destructor_t destructor, filter_runner_t runner,
126 filter_context_constructor_t context_constructor,
127 filter_context_destructor_t context_destructor);
129 __attribute__((nonnull(2)))
130 filter_result_t filter_hook_register(filter_type_t filter, const char *name);
132 __attribute__((nonnull(2)))
133 filter_param_id_t filter_param_register(filter_type_t filter, const char *name);
139 __attribute__((nonnull(1)))
140 static inline void filter_init(filter_t *filter)
142 const filter_t f = FILTER_INIT;
146 __attribute__((nonnull(1,2)))
147 void filter_set_name(filter_t *filter, const char *name, int len);
149 __attribute__((nonnull(1,2)))
150 bool filter_set_type(filter_t *filter, const char *type, int len);
152 __attribute__((nonnull(1,2,4)))
153 bool filter_add_param(filter_t *filter, const char *name, int name_len,
154 const char *value, int value_len);
156 __attribute__((nonnull(1,2,4)))
157 bool filter_add_hook(filter_t *filter, const char *name, int name_len,
158 const char *value, int value_len);
160 __attribute__((nonnull(1)))
161 bool filter_build(filter_t *filter);
163 __attribute__((nonnull(1,2)))
164 static inline int filter_find_with_name(const A(filter_t) *array, const char *name)
167 int end = array->len;
169 while (start < end) {
170 int mid = (start + end) / 2;
171 int cmp = strcmp(name, array_elt(*array, mid).name);
175 } else if (cmp < 0) {
184 __attribute__((nonnull(1,2)))
185 bool filter_update_references(filter_t *filter, A(filter_t) *array);
187 __attribute__((nonnull(1)))
188 bool filter_check_safety(A(filter_t) *array);
190 __attribute__((nonnull(1)))
191 static inline void filter_hook_wipe(filter_hook_t *hook)
193 p_delete(&hook->value);
196 __attribute__((nonnull(1)))
197 static inline void filter_params_wipe(filter_param_t *param)
199 p_delete(¶m->value);
202 __attribute__((nonnull(1)))
203 void filter_wipe(filter_t *filter);
209 __attribute__((nonnull(1,2)))
210 const filter_hook_t *filter_run(const filter_t *filter, const query_t *query,
211 filter_context_t *context);
213 __attribute__((nonnull(1,2)))
214 bool filter_test(const filter_t *filter, const query_t *query,
215 filter_context_t *context, filter_result_t expt);
221 #define FILTER_PARAM_PARSE_STRING(Param, Dest) \
222 case ATK_ ## Param: { \
223 (Dest) = param->value; \
226 #define FILTER_PARAM_PARSE_INT(Param, Dest) \
227 case ATK_ ## Param: { \
229 (Dest) = strtol(param->value, &next, 10); \
230 PARSE_CHECK(!*next, "invalid %s value %.*s", atokens[ATK_ ## Param], \
231 param->value_len, param->value); \
234 #define FILTER_PARAM_PARSE_BOOLEAN(Param, Dest) \
235 case ATK_ ## Param: { \
236 if (param->value_len == 1 && param->value[0] == '1') { \
238 } else if (param->value_len == 1 && param->value[0] == '0') { \
240 } else if (param->value_len == 4 \
241 && ascii_tolower(param->value[0]) == 't') { \
242 (Dest) = ascii_tolower(param->value[1]) == 'r' \
243 && ascii_tolower(param->value[2]) == 'u' \
244 && ascii_tolower(param->value[3]) == 'e'; \
245 } else if (param->value_len == 5 \
246 && ascii_tolower(param->value[0]) == 'f') { \
247 (Dest) = ascii_tolower(param->value[1]) == 'a' \
248 && ascii_tolower(param->value[2]) == 'l' \
249 && ascii_tolower(param->value[3]) == 's' \
250 && ascii_tolower(param->value[4]) == 'e'; \
252 PARSE_CHECK(false, "invalid %s value %.*s", atokens[ATK_ ## Param],\
253 param->value_len, param->value); \
261 __attribute__((nonnull))
262 void filter_context_prepare(filter_context_t *context, void* qctx);
264 __attribute__((nonnull))
265 void filter_context_wipe(filter_context_t *context);