Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ |
| 2 | /* config-loader-libxml.c libxml2 XML loader |
| 3 | * |
| 4 | * Copyright (C) 2003 Red Hat, Inc. |
| 5 | * |
| 6 | * Licensed under the Academic Free License version 2.1 |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "config-parser.h" |
| 26 | #include <dbus/dbus-internals.h> |
| 27 | #include <libxml/xmlreader.h> |
| 28 | #include <libxml/parser.h> |
| 29 | #include <libxml/globals.h> |
| 30 | #include <libxml/xmlmemory.h> |
| 31 | #ifdef HAVE_ERRNO_H |
| 32 | #include <errno.h> |
| 33 | #endif |
| 34 | #include <string.h> |
| 35 | |
| 36 | /* About the error handling: |
| 37 | * - setup a "structured" error handler that catches structural |
| 38 | * errors and some oom errors |
| 39 | * - assume that a libxml function returning an error code means |
| 40 | * out-of-memory |
| 41 | */ |
| 42 | #define _DBUS_MAYBE_SET_OOM(e) (dbus_error_is_set(e) ? (void)0 : _DBUS_SET_OOM(e)) |
| 43 | |
| 44 | |
| 45 | static dbus_bool_t |
| 46 | xml_text_start_element (BusConfigParser *parser, |
| 47 | xmlTextReader *reader, |
| 48 | DBusError *error) |
| 49 | { |
| 50 | const char *name; |
| 51 | int n_attributes; |
| 52 | const char **attribute_names, **attribute_values; |
| 53 | dbus_bool_t ret; |
| 54 | int i, status, is_empty; |
| 55 | |
| 56 | _DBUS_ASSERT_ERROR_IS_CLEAR (error); |
| 57 | |
| 58 | ret = FALSE; |
| 59 | attribute_names = NULL; |
| 60 | attribute_values = NULL; |
| 61 | |
| 62 | name = xmlTextReaderConstName (reader); |
| 63 | n_attributes = xmlTextReaderAttributeCount (reader); |
| 64 | is_empty = xmlTextReaderIsEmptyElement (reader); |
| 65 | |
| 66 | if (name == NULL || n_attributes < 0 || is_empty == -1) |
| 67 | { |
| 68 | _DBUS_MAYBE_SET_OOM (error); |
| 69 | goto out; |
| 70 | } |
| 71 | |
| 72 | attribute_names = dbus_new0 (const char *, n_attributes + 1); |
| 73 | attribute_values = dbus_new0 (const char *, n_attributes + 1); |
| 74 | if (attribute_names == NULL || attribute_values == NULL) |
| 75 | { |
| 76 | _DBUS_SET_OOM (error); |
| 77 | goto out; |
| 78 | } |
| 79 | i = 0; |
| 80 | while ((status = xmlTextReaderMoveToNextAttribute (reader)) == 1) |
| 81 | { |
| 82 | _dbus_assert (i < n_attributes); |
| 83 | attribute_names[i] = xmlTextReaderConstName (reader); |
| 84 | attribute_values[i] = xmlTextReaderConstValue (reader); |
| 85 | if (attribute_names[i] == NULL || attribute_values[i] == NULL) |
| 86 | { |
| 87 | _DBUS_MAYBE_SET_OOM (error); |
| 88 | goto out; |
| 89 | } |
| 90 | i++; |
| 91 | } |
| 92 | if (status == -1) |
| 93 | { |
| 94 | _DBUS_MAYBE_SET_OOM (error); |
| 95 | goto out; |
| 96 | } |
| 97 | _dbus_assert (i == n_attributes); |
| 98 | |
| 99 | ret = bus_config_parser_start_element (parser, name, |
| 100 | attribute_names, attribute_values, |
| 101 | error); |
| 102 | if (ret && is_empty == 1) |
| 103 | ret = bus_config_parser_end_element (parser, name, error); |
| 104 | |
| 105 | out: |
| 106 | dbus_free (attribute_names); |
| 107 | dbus_free (attribute_values); |
| 108 | |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | static void xml_shut_up (void *ctx, const char *msg, ...) |
| 113 | { |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | static void |
| 118 | xml_text_reader_error (void *arg, xmlErrorPtr xml_error) |
| 119 | { |
| 120 | DBusError *error = arg; |
| 121 | |
| 122 | #if 0 |
| 123 | _dbus_verbose ("XML_ERROR level=%d, domain=%d, code=%d, msg=%s\n", |
| 124 | xml_error->level, xml_error->domain, |
| 125 | xml_error->code, xml_error->message); |
| 126 | #endif |
| 127 | |
| 128 | if (!dbus_error_is_set (error)) |
| 129 | { |
| 130 | if (xml_error->code == XML_ERR_NO_MEMORY) |
| 131 | _DBUS_SET_OOM (error); |
| 132 | else if (xml_error->level == XML_ERR_ERROR || |
| 133 | xml_error->level == XML_ERR_FATAL) |
| 134 | dbus_set_error (error, DBUS_ERROR_FAILED, |
| 135 | "Error loading config file: '%s'", |
| 136 | xml_error->message); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | |
| 141 | BusConfigParser* |
| 142 | bus_config_load (const DBusString *file, |
| 143 | dbus_bool_t is_toplevel, |
| 144 | const BusConfigParser *parent, |
| 145 | DBusError *error) |
| 146 | |
| 147 | { |
| 148 | xmlTextReader *reader; |
| 149 | BusConfigParser *parser; |
| 150 | DBusString dirname, data; |
| 151 | DBusError tmp_error; |
| 152 | int ret; |
| 153 | |
| 154 | _DBUS_ASSERT_ERROR_IS_CLEAR (error); |
| 155 | |
| 156 | parser = NULL; |
| 157 | reader = NULL; |
| 158 | |
| 159 | if (!_dbus_string_init (&dirname)) |
| 160 | { |
| 161 | _DBUS_SET_OOM (error); |
| 162 | return NULL; |
| 163 | } |
| 164 | |
| 165 | if (!_dbus_string_init (&data)) |
| 166 | { |
| 167 | _DBUS_SET_OOM (error); |
| 168 | _dbus_string_free (&dirname); |
| 169 | return NULL; |
| 170 | } |
| 171 | |
| 172 | if (is_toplevel) |
| 173 | { |
| 174 | /* xmlMemSetup only fails if one of the functions is NULL */ |
| 175 | xmlMemSetup (dbus_free, |
| 176 | dbus_malloc, |
| 177 | dbus_realloc, |
| 178 | _dbus_strdup); |
| 179 | xmlInitParser (); |
| 180 | xmlSetGenericErrorFunc (NULL, xml_shut_up); |
| 181 | } |
| 182 | |
| 183 | if (!_dbus_string_get_dirname (file, &dirname)) |
| 184 | { |
| 185 | _DBUS_SET_OOM (error); |
| 186 | goto failed; |
| 187 | } |
| 188 | |
| 189 | parser = bus_config_parser_new (&dirname, is_toplevel, parent); |
| 190 | if (parser == NULL) |
| 191 | { |
| 192 | _DBUS_SET_OOM (error); |
| 193 | goto failed; |
| 194 | } |
| 195 | |
| 196 | if (!_dbus_file_get_contents (&data, file, error)) |
| 197 | goto failed; |
| 198 | |
| 199 | reader = xmlReaderForMemory (_dbus_string_get_const_data (&data), |
| 200 | _dbus_string_get_length (&data), |
| 201 | NULL, NULL, 0); |
| 202 | if (reader == NULL) |
| 203 | { |
| 204 | _DBUS_SET_OOM (error); |
| 205 | goto failed; |
| 206 | } |
| 207 | |
| 208 | xmlTextReaderSetParserProp (reader, XML_PARSER_SUBST_ENTITIES, 1); |
| 209 | |
| 210 | dbus_error_init (&tmp_error); |
| 211 | xmlTextReaderSetStructuredErrorHandler (reader, xml_text_reader_error, &tmp_error); |
| 212 | |
| 213 | while ((ret = xmlTextReaderRead (reader)) == 1) |
| 214 | { |
| 215 | int type; |
| 216 | |
| 217 | if (dbus_error_is_set (&tmp_error)) |
| 218 | goto reader_out; |
| 219 | |
| 220 | type = xmlTextReaderNodeType (reader); |
| 221 | if (type == -1) |
| 222 | { |
| 223 | _DBUS_MAYBE_SET_OOM (&tmp_error); |
| 224 | goto reader_out; |
| 225 | } |
| 226 | |
| 227 | switch ((xmlReaderTypes) type) { |
| 228 | case XML_READER_TYPE_ELEMENT: |
| 229 | xml_text_start_element (parser, reader, &tmp_error); |
| 230 | break; |
| 231 | |
| 232 | case XML_READER_TYPE_TEXT: |
| 233 | case XML_READER_TYPE_CDATA: |
| 234 | { |
| 235 | DBusString content; |
| 236 | const char *value; |
| 237 | value = xmlTextReaderConstValue (reader); |
| 238 | if (value != NULL) |
| 239 | { |
| 240 | _dbus_string_init_const (&content, value); |
| 241 | bus_config_parser_content (parser, &content, &tmp_error); |
| 242 | } |
| 243 | else |
| 244 | _DBUS_MAYBE_SET_OOM (&tmp_error); |
| 245 | break; |
| 246 | } |
| 247 | |
| 248 | case XML_READER_TYPE_DOCUMENT_TYPE: |
| 249 | { |
| 250 | const char *name; |
| 251 | name = xmlTextReaderConstName (reader); |
| 252 | if (name != NULL) |
| 253 | bus_config_parser_check_doctype (parser, name, &tmp_error); |
| 254 | else |
| 255 | _DBUS_MAYBE_SET_OOM (&tmp_error); |
| 256 | break; |
| 257 | } |
| 258 | |
| 259 | case XML_READER_TYPE_END_ELEMENT: |
| 260 | { |
| 261 | const char *name; |
| 262 | name = xmlTextReaderConstName (reader); |
| 263 | if (name != NULL) |
| 264 | bus_config_parser_end_element (parser, name, &tmp_error); |
| 265 | else |
| 266 | _DBUS_MAYBE_SET_OOM (&tmp_error); |
| 267 | break; |
| 268 | } |
| 269 | |
| 270 | case XML_READER_TYPE_DOCUMENT: |
| 271 | case XML_READER_TYPE_DOCUMENT_FRAGMENT: |
| 272 | case XML_READER_TYPE_PROCESSING_INSTRUCTION: |
| 273 | case XML_READER_TYPE_COMMENT: |
| 274 | case XML_READER_TYPE_ENTITY: |
| 275 | case XML_READER_TYPE_NOTATION: |
| 276 | case XML_READER_TYPE_WHITESPACE: |
| 277 | case XML_READER_TYPE_SIGNIFICANT_WHITESPACE: |
| 278 | case XML_READER_TYPE_END_ENTITY: |
| 279 | case XML_READER_TYPE_XML_DECLARATION: |
| 280 | /* nothing to do, just read on */ |
| 281 | break; |
| 282 | |
| 283 | case XML_READER_TYPE_NONE: |
| 284 | case XML_READER_TYPE_ATTRIBUTE: |
| 285 | case XML_READER_TYPE_ENTITY_REFERENCE: |
| 286 | _dbus_assert_not_reached ("unexpected nodes in XML"); |
| 287 | } |
| 288 | |
| 289 | if (dbus_error_is_set (&tmp_error)) |
| 290 | goto reader_out; |
| 291 | } |
| 292 | |
| 293 | if (ret == -1) |
| 294 | _DBUS_MAYBE_SET_OOM (&tmp_error); |
| 295 | |
| 296 | reader_out: |
| 297 | xmlFreeTextReader (reader); |
| 298 | reader = NULL; |
| 299 | if (dbus_error_is_set (&tmp_error)) |
| 300 | { |
| 301 | dbus_move_error (&tmp_error, error); |
| 302 | goto failed; |
| 303 | } |
| 304 | |
| 305 | if (!bus_config_parser_finished (parser, error)) |
| 306 | goto failed; |
| 307 | _dbus_string_free (&dirname); |
| 308 | _dbus_string_free (&data); |
| 309 | if (is_toplevel) |
| 310 | xmlCleanupParser(); |
| 311 | _DBUS_ASSERT_ERROR_IS_CLEAR (error); |
| 312 | return parser; |
| 313 | |
| 314 | failed: |
| 315 | _DBUS_ASSERT_ERROR_IS_SET (error); |
| 316 | _dbus_string_free (&dirname); |
| 317 | _dbus_string_free (&data); |
| 318 | if (is_toplevel) |
| 319 | xmlCleanupParser(); |
| 320 | if (parser) |
| 321 | bus_config_parser_unref (parser); |
| 322 | _dbus_assert (reader == NULL); /* must go to reader_out first */ |
| 323 | return NULL; |
| 324 | } |