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-expat.c expat 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 <expat.h> |
| 28 | |
| 29 | static XML_Memory_Handling_Suite memsuite; |
| 30 | |
| 31 | typedef struct |
| 32 | { |
| 33 | BusConfigParser *parser; |
| 34 | const char *filename; |
| 35 | DBusString content; |
| 36 | DBusError *error; |
| 37 | dbus_bool_t failed; |
| 38 | } ExpatParseContext; |
| 39 | |
| 40 | static dbus_bool_t |
| 41 | process_content (ExpatParseContext *context) |
| 42 | { |
| 43 | if (context->failed) |
| 44 | return FALSE; |
| 45 | |
| 46 | if (_dbus_string_get_length (&context->content) > 0) |
| 47 | { |
| 48 | if (!bus_config_parser_content (context->parser, |
| 49 | &context->content, |
| 50 | context->error)) |
| 51 | { |
| 52 | context->failed = TRUE; |
| 53 | return FALSE; |
| 54 | } |
| 55 | _dbus_string_set_length (&context->content, 0); |
| 56 | } |
| 57 | |
| 58 | return TRUE; |
| 59 | } |
| 60 | |
| 61 | static void |
| 62 | expat_StartElementHandler (void *userData, |
| 63 | const XML_Char *name, |
| 64 | const XML_Char **atts) |
| 65 | { |
| 66 | ExpatParseContext *context = userData; |
| 67 | int i; |
| 68 | char **names; |
| 69 | char **values; |
| 70 | |
| 71 | /* Expat seems to suck and can't abort the parse if we |
| 72 | * throw an error. Expat 2.0 is supposed to fix this. |
| 73 | */ |
| 74 | if (context->failed) |
| 75 | return; |
| 76 | |
| 77 | if (!process_content (context)) |
| 78 | return; |
| 79 | |
| 80 | /* "atts" is key, value, key, value, NULL */ |
| 81 | for (i = 0; atts[i] != NULL; ++i) |
| 82 | ; /* nothing */ |
| 83 | |
| 84 | _dbus_assert (i % 2 == 0); |
| 85 | names = dbus_new0 (char *, i / 2 + 1); |
| 86 | values = dbus_new0 (char *, i / 2 + 1); |
| 87 | |
| 88 | if (names == NULL || values == NULL) |
| 89 | { |
| 90 | dbus_set_error (context->error, DBUS_ERROR_NO_MEMORY, NULL); |
| 91 | context->failed = TRUE; |
| 92 | dbus_free (names); |
| 93 | dbus_free (values); |
| 94 | return; |
| 95 | } |
| 96 | |
| 97 | i = 0; |
| 98 | while (atts[i] != NULL) |
| 99 | { |
| 100 | _dbus_assert (i % 2 == 0); |
| 101 | names [i / 2] = (char*) atts[i]; |
| 102 | values[i / 2] = (char*) atts[i+1]; |
| 103 | |
| 104 | i += 2; |
| 105 | } |
| 106 | |
| 107 | if (!bus_config_parser_start_element (context->parser, |
| 108 | name, |
| 109 | (const char **) names, |
| 110 | (const char **) values, |
| 111 | context->error)) |
| 112 | { |
| 113 | dbus_free (names); |
| 114 | dbus_free (values); |
| 115 | context->failed = TRUE; |
| 116 | return; |
| 117 | } |
| 118 | |
| 119 | dbus_free (names); |
| 120 | dbus_free (values); |
| 121 | } |
| 122 | |
| 123 | static void |
| 124 | expat_EndElementHandler (void *userData, |
| 125 | const XML_Char *name) |
| 126 | { |
| 127 | ExpatParseContext *context = userData; |
| 128 | |
| 129 | if (!process_content (context)) |
| 130 | return; |
| 131 | |
| 132 | if (!bus_config_parser_end_element (context->parser, |
| 133 | name, |
| 134 | context->error)) |
| 135 | { |
| 136 | context->failed = TRUE; |
| 137 | return; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /* s is not 0 terminated. */ |
| 142 | static void |
| 143 | expat_CharacterDataHandler (void *userData, |
| 144 | const XML_Char *s, |
| 145 | int len) |
| 146 | { |
| 147 | ExpatParseContext *context = userData; |
| 148 | if (context->failed) |
| 149 | return; |
| 150 | |
| 151 | if (!_dbus_string_append_len (&context->content, |
| 152 | s, len)) |
| 153 | { |
| 154 | dbus_set_error (context->error, DBUS_ERROR_NO_MEMORY, NULL); |
| 155 | context->failed = TRUE; |
| 156 | return; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | |
| 161 | BusConfigParser* |
| 162 | bus_config_load (const DBusString *file, |
| 163 | dbus_bool_t is_toplevel, |
| 164 | const BusConfigParser *parent, |
| 165 | DBusError *error) |
| 166 | { |
| 167 | XML_Parser expat; |
| 168 | const char *filename; |
| 169 | BusConfigParser *parser; |
| 170 | ExpatParseContext context; |
| 171 | DBusString dirname; |
| 172 | |
| 173 | _DBUS_ASSERT_ERROR_IS_CLEAR (error); |
| 174 | |
| 175 | parser = NULL; |
| 176 | expat = NULL; |
| 177 | context.error = error; |
| 178 | context.failed = FALSE; |
| 179 | |
| 180 | filename = _dbus_string_get_const_data (file); |
| 181 | |
| 182 | if (!_dbus_string_init (&context.content)) |
| 183 | { |
| 184 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 185 | return NULL; |
| 186 | } |
| 187 | |
| 188 | if (!_dbus_string_init (&dirname)) |
| 189 | { |
| 190 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 191 | _dbus_string_free (&context.content); |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | memsuite.malloc_fcn = dbus_malloc; |
| 196 | memsuite.realloc_fcn = dbus_realloc; |
| 197 | memsuite.free_fcn = dbus_free; |
| 198 | |
| 199 | expat = XML_ParserCreate_MM ("UTF-8", &memsuite, NULL); |
| 200 | if (expat == NULL) |
| 201 | { |
| 202 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 203 | goto failed; |
| 204 | } |
| 205 | |
| 206 | if (!_dbus_string_get_dirname (file, &dirname)) |
| 207 | { |
| 208 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 209 | goto failed; |
| 210 | } |
| 211 | |
| 212 | parser = bus_config_parser_new (&dirname, is_toplevel, parent); |
| 213 | if (parser == NULL) |
| 214 | { |
| 215 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 216 | goto failed; |
| 217 | } |
| 218 | context.parser = parser; |
| 219 | |
| 220 | XML_SetUserData (expat, &context); |
| 221 | XML_SetElementHandler (expat, |
| 222 | expat_StartElementHandler, |
| 223 | expat_EndElementHandler); |
| 224 | XML_SetCharacterDataHandler (expat, |
| 225 | expat_CharacterDataHandler); |
| 226 | |
| 227 | { |
| 228 | DBusString data; |
| 229 | const char *data_str; |
| 230 | |
| 231 | if (!_dbus_string_init (&data)) |
| 232 | { |
| 233 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 234 | goto failed; |
| 235 | } |
| 236 | |
| 237 | if (!_dbus_file_get_contents (&data, file, error)) |
| 238 | { |
| 239 | _dbus_string_free (&data); |
| 240 | goto failed; |
| 241 | } |
| 242 | |
| 243 | data_str = _dbus_string_get_const_data (&data); |
| 244 | |
| 245 | if (!XML_Parse (expat, data_str, _dbus_string_get_length (&data), TRUE)) |
| 246 | { |
| 247 | if (context.error != NULL && |
| 248 | !dbus_error_is_set (context.error)) |
| 249 | { |
| 250 | enum XML_Error e; |
| 251 | |
| 252 | e = XML_GetErrorCode (expat); |
| 253 | if (e == XML_ERROR_NO_MEMORY) |
| 254 | dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); |
| 255 | else |
| 256 | dbus_set_error (error, DBUS_ERROR_FAILED, |
| 257 | "Error in file %s, line %d, column %d: %s\n", |
| 258 | filename, |
| 259 | XML_GetCurrentLineNumber (expat), |
| 260 | XML_GetCurrentColumnNumber (expat), |
| 261 | XML_ErrorString (e)); |
| 262 | } |
| 263 | |
| 264 | _dbus_string_free (&data); |
| 265 | goto failed; |
| 266 | } |
| 267 | |
| 268 | _dbus_string_free (&data); |
| 269 | |
| 270 | if (context.failed) |
| 271 | goto failed; |
| 272 | } |
| 273 | |
| 274 | if (!bus_config_parser_finished (parser, error)) |
| 275 | goto failed; |
| 276 | |
| 277 | _dbus_string_free (&dirname); |
| 278 | _dbus_string_free (&context.content); |
| 279 | XML_ParserFree (expat); |
| 280 | |
| 281 | _DBUS_ASSERT_ERROR_IS_CLEAR (error); |
| 282 | return parser; |
| 283 | |
| 284 | failed: |
| 285 | _DBUS_ASSERT_ERROR_IS_SET (error); |
| 286 | |
| 287 | _dbus_string_free (&dirname); |
| 288 | _dbus_string_free (&context.content); |
| 289 | if (expat) |
| 290 | XML_ParserFree (expat); |
| 291 | if (parser) |
| 292 | bus_config_parser_unref (parser); |
| 293 | return NULL; |
| 294 | } |