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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
|
/* Copyright (C) 2011-2012 G.P. Halkes
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License version 3, as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdlib.h>
#include "config_internal.h"
#include "util.h"
#include "parser.h"
typedef struct {
const t3_config_t *root, *types;
t3_config_error_t *error;
int flags;
} validation_context_t;
static char meta_schema_buffer[] = {
#include "meta_schema.bytes"
};
static char *dup_file_name(const t3_config_t *config) {
if (config == NULL || config->file_name == NULL)
return NULL;
return _t3_config_strdup(config->file_name->file_name);
}
static t3_bool validate_aggregate_keys(const t3_config_t *config_part, const t3_config_t *schema_part,
validation_context_t *context);
static t3_config_type_t resolve_type(const char *type_name, const t3_config_t *types, const t3_config_t **schema) {
t3_config_type_t config_type;
t3_config_t *type_schema;
if ((config_type = _t3_config_str2type(type_name)) != T3_CONFIG_NONE)
return config_type;
/* This will generally result in a single lookup, because most type
definitions are elaborations on the basic types. The only reason not
to do so, is to have a single name that (for now) is used as a place
holder elsewhere in the schema that allows easy change. */
while ((type_schema = t3_config_get(types, type_name)) != NULL) {
type_name = t3_config_get_string(t3_config_get(type_schema, "type"));
if ((config_type = _t3_config_str2type(type_name)) != T3_CONFIG_NONE) {
*schema = type_schema;
return config_type;
}
}
return T3_CONFIG_NONE;
}
static t3_bool validate_constraints(const t3_config_t *config_part, const t3_config_t *schema_part,
validation_context_t *context)
{
const t3_config_t *constraint;
for (constraint = t3_config_get(t3_config_get(schema_part, "constraint"), NULL);
constraint != NULL; constraint = t3_config_get_next(constraint))
{
if (constraint->type == (int) T3_CONFIG_EXPRESSION && !_t3_config_evaluate_expr(constraint->value.expr, config_part, context->root)) {
if (context->error != NULL) {
context->error->error = T3_ERR_CONSTRAINT_VIOLATION;
context->error->line_number = config_part->line_number;
if (context->flags & T3_CONFIG_VERBOSE_ERROR)
context->error->extra = _t3_config_strdup(constraint->value.expr->value.operand[1]->value.string);
if (context->flags & T3_CONFIG_ERROR_FILE_NAME)
context->error->file_name = dup_file_name(config_part);
}
return t3_false;
}
}
return t3_true;
}
static t3_bool validate_key(const t3_config_t *config_part, t3_config_type_t type, const t3_config_t *schema_part,
validation_context_t *context)
{
if (type != config_part->type && !(type == T3_CONFIG_LIST && config_part->type == T3_CONFIG_PLIST) && type != (int) T3_CONFIG_ANY) {
if (context->error != NULL) {
context->error->error = T3_ERR_INVALID_KEY_TYPE;
context->error->line_number = config_part->line_number;
if (context->flags & T3_CONFIG_VERBOSE_ERROR)
context->error->extra = config_part->name == NULL ? NULL : _t3_config_strdup(config_part->name);
if (context->flags & T3_CONFIG_ERROR_FILE_NAME)
context->error->file_name = dup_file_name(config_part);
}
return t3_false;
}
if (type == T3_CONFIG_SECTION)
return validate_aggregate_keys(config_part, schema_part, context);
else if (type == T3_CONFIG_LIST && t3_config_get(schema_part, "item-type") != NULL)
return validate_aggregate_keys(config_part, schema_part, context);
else
return validate_constraints(config_part, schema_part, context);
}
static t3_bool validate_aggregate_keys(const t3_config_t *config_part, const t3_config_t *schema_part,
validation_context_t *context)
{
const t3_config_t *allowed_keys = t3_config_get(schema_part, "allowed-keys"),
*item_type = t3_config_get(schema_part, "item-type"),
*sub_part, *sub_schema;
t3_config_type_t resolved_type;
if (allowed_keys != NULL || item_type != NULL) {
for (sub_part = t3_config_get(config_part, NULL); sub_part != NULL; sub_part = t3_config_get_next(sub_part)) {
if (allowed_keys != NULL && (sub_schema = t3_config_get(allowed_keys, sub_part->name)) != NULL) {
resolved_type = resolve_type(t3_config_get_string(t3_config_get(sub_schema, "type")), context->types, &sub_schema);
if (!validate_key(sub_part, resolved_type, sub_schema, context))
return t3_false;
} else if (item_type != NULL) {
sub_schema = NULL;
resolved_type = resolve_type(t3_config_get_string(item_type), context->types, &sub_schema);
if (!validate_key(sub_part, resolved_type, sub_schema, context))
return t3_false;
} else {
if (context->error != NULL) {
context->error->error = T3_ERR_INVALID_KEY;
context->error->line_number = sub_part->line_number;
if (context->flags & T3_CONFIG_VERBOSE_ERROR)
context->error->extra = _t3_config_strdup(sub_part->name);
if (context->flags & T3_CONFIG_ERROR_FILE_NAME)
context->error->file_name = dup_file_name(sub_part);
}
return t3_false;
}
}
}
return validate_constraints(config_part, schema_part, context);
}
t3_bool t3_config_validate(t3_config_t *config, const t3_config_schema_t *schema,
t3_config_error_t *error, int flags)
{
validation_context_t context;
if ((int) ((const t3_config_t *) schema)->type != T3_CONFIG_SCHEMA) {
if (error != NULL) {
error->error = T3_ERR_BAD_ARG;
error->line_number = 0;
if (flags & T3_CONFIG_VERBOSE_ERROR)
error->extra = NULL;
if (flags & T3_CONFIG_ERROR_FILE_NAME)
error->file_name = NULL;
}
return t3_false;
}
context.root = config;
context.types = t3_config_get((const t3_config_t *) schema, "types");
context.error = error;
context.flags = flags;
return validate_aggregate_keys(config, (const t3_config_t *) schema, &context);
}
static expr_node_t *parse_constraint_string(const char *constraint, int *error) {
parse_context_t context;
int retval;
context.scan_type = SCAN_BUFFER;
context.buffer = constraint;
context.buffer_size = strlen(constraint);
context.buffer_idx = 0;
context.line_number = 1;
context.result = NULL;
context.constraint_parser = t3_true;
/* Initialize lexer. */
if (_t3_config_lex_init_extra(&context, &context.scanner) != 0)
return NULL;
/* Perform parse. */
if ((retval = _t3_config_parse_constraint(&context)) != 0) {
if (error != NULL)
*error = retval;
/* On failure, we free all memory allocated by the partial parse ... */
_t3_config_delete_expr(context.result);
/* ... and set context->config to NULL so we return NULL at the end. */
context.result = NULL;
}
/* Free memory allocated by lexer. */
_t3_config_lex_destroy(context.scanner);
return context.result;
}
static t3_bool parse_constraints(t3_config_t *schema, const t3_config_t *root, t3_config_error_t *error, const t3_config_opts_t *opts) {
t3_config_t *constraint;
t3_config_t *part;
for (constraint = t3_config_get(t3_config_get(schema, "constraint"), NULL);
constraint != NULL; constraint = t3_config_get_next(constraint))
{
expr_node_t *expr = parse_constraint_string(t3_config_get_string(constraint), error == NULL ? NULL : &error->error);
if (expr == NULL) {
if (error != NULL) {
error->line_number = constraint->line_number;
if (opts != NULL) {
if (opts->flags & T3_CONFIG_VERBOSE_ERROR)
error->extra = NULL;
if (opts->flags & T3_CONFIG_ERROR_FILE_NAME)
error->file_name = dup_file_name(constraint);
}
}
return t3_false;
}
if (!_t3_config_validate_expr(expr, schema, root)) {
_t3_config_delete_expr(expr);
if (error != NULL) {
error->error = T3_ERR_INVALID_CONSTRAINT;
error->line_number = constraint->line_number;
if (opts != NULL) {
if (opts->flags & T3_CONFIG_VERBOSE_ERROR)
error->extra = NULL;
if (opts->flags & T3_CONFIG_ERROR_FILE_NAME)
error->file_name = dup_file_name(constraint);
}
}
return t3_false;
}
constraint->type = T3_CONFIG_EXPRESSION;
if (expr->value.operand[1]->value.string == NULL)
expr->value.operand[1]->value.string = constraint->value.string;
else
free(constraint->value.string);
constraint->value.expr = expr;
}
for (schema = t3_config_get(schema, NULL); schema != NULL; schema = t3_config_get_next(schema)) {
if (schema->type != T3_CONFIG_SECTION)
continue;
for (part = t3_config_get(schema, NULL); part != NULL; part = t3_config_get_next(part)) {
if (!parse_constraints(part, root, error, opts))
return t3_false;
}
}
return t3_true;
}
static t3_bool check_type_for_loop(t3_config_t *type, const t3_config_t *types) {
const char *referred_type;
int saved_line_number = type->line_number;
t3_bool result;
if (type->line_number < 0)
return t3_true;
referred_type = t3_config_get(type, "type")->value.string;
if (_t3_config_str2type(referred_type) != T3_CONFIG_NONE)
return t3_false;
type->line_number = -1;
result = check_type_for_loop(t3_config_get(types, referred_type), types);
type->line_number = saved_line_number;
return result;
}
static t3_bool has_loops(const t3_config_t *schema, t3_config_error_t *error, const t3_config_opts_t *opts) {
const t3_config_t *types = t3_config_get(schema, "types");
t3_config_t *type;
if (types == NULL)
return t3_false;
for (type = t3_config_get(types, NULL); type != NULL; type = t3_config_get_next(type)) {
if (check_type_for_loop(type, types)) {
if (error != NULL) {
error->error = T3_ERR_RECURSIVE_TYPE;
error->line_number = type->line_number;
if (opts != NULL) {
if (opts->flags & T3_CONFIG_VERBOSE_ERROR)
error->extra = _t3_config_strdup(t3_config_get(type, "type")->value.string);
if (opts->flags & T3_CONFIG_ERROR_FILE_NAME)
error->file_name = dup_file_name(type);
}
}
return t3_true;
}
}
return t3_false;
}
static t3_config_schema_t *handle_schema_validation(t3_config_t *config, t3_config_error_t *error, const t3_config_opts_t *opts) {
t3_config_t *meta_schema = NULL;
t3_config_error_t local_error;
if ((meta_schema = t3_config_read_buffer(meta_schema_buffer, sizeof(meta_schema_buffer), &local_error, NULL)) == NULL||
!parse_constraints(meta_schema, meta_schema, &local_error, NULL))
{
if (error != NULL) {
error->error = local_error.error == T3_ERR_OUT_OF_MEMORY ? T3_ERR_OUT_OF_MEMORY : T3_ERR_INTERNAL;
error->line_number = 0;
if (opts != NULL) {
if (opts->flags & T3_CONFIG_VERBOSE_ERROR)
error->extra = NULL;
if (opts->flags & T3_CONFIG_ERROR_FILE_NAME)
error->file_name = NULL;
}
}
goto error_end;
}
meta_schema->type = T3_CONFIG_SCHEMA;
if (!t3_config_validate(config, (t3_config_schema_t *) meta_schema, error, opts == NULL ? 0 : opts->flags) ||
has_loops(config, error, opts) ||
!parse_constraints(config, config, error, opts))
goto error_end;
t3_config_delete(meta_schema);
config->type = T3_CONFIG_SCHEMA;
return (t3_config_schema_t *) config;
error_end:
t3_config_delete(config);
t3_config_delete(meta_schema);
return NULL;
}
t3_config_schema_t *t3_config_read_schema_file(FILE *file, t3_config_error_t *error, const t3_config_opts_t *opts) {
t3_config_t *config;
if ((config = t3_config_read_file(file, error, opts)) == NULL)
return NULL;
return handle_schema_validation(config, error, opts);
}
t3_config_schema_t *t3_config_read_schema_buffer(const char *buffer, size_t size,
t3_config_error_t *error, const t3_config_opts_t *opts)
{
t3_config_t *config;
if ((config = t3_config_read_buffer(buffer, size, error, opts)) == NULL)
return NULL;
return handle_schema_validation(config, error, opts);
}
void t3_config_delete_schema(t3_config_schema_t *schema) {
t3_config_delete((t3_config_t *) schema);
}
#ifdef DEBUG
t3_config_schema_t *_t3_config_config2schema(t3_config_t *config, t3_config_error_t *error, const t3_config_opts_t *opts) {
return handle_schema_validation(config, error, opts);
}
#endif
|