https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r228378 | mnicholson | 2009-11-06 10:26:59 -0600 (Fri, 06 Nov 2009) | 8 lines Properly handle '=' while decoding base64 messages and null terminate strings returned from BASE64_DECODE. (closes issue #15271) Reported by: chappell Patches: base64_fix.patch uploaded by chappell (license 8) Tested by: kobaz ........ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@228620 65c4cc65-6c06-0410-ace0-fbb531ad65f3
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2005 - 2006, Digium, Inc.
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* Copyright (C) 2005, Claude Patry
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Use the base64 as functions
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*
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* \ingroup functions
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/pbx.h" /* function register/unregister */
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#include "asterisk/utils.h"
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#include "asterisk/strings.h"
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/*** DOCUMENTATION
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<function name="BASE64_ENCODE" language="en_US">
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<synopsis>
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Encode a string in base64.
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</synopsis>
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<syntax>
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<parameter name="string" required="true">
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<para>Input string</para>
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</parameter>
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</syntax>
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<description>
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<para>Returns the base64 string.</para>
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</description>
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</function>
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<function name="BASE64_DECODE" language="en_US">
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<synopsis>
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Decode a base64 string.
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</synopsis>
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<syntax>
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<parameter name="string" required="true">
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<para>Input string.</para>
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</parameter>
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</syntax>
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<description>
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<para>Returns the plain text string.</para>
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</description>
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</function>
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***/
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static int base64_helper(struct ast_channel *chan, const char *cmd, char *data,
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char *buf, struct ast_str **str, ssize_t len)
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{
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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "Syntax: %s(<data>) - missing argument!\n", cmd);
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return -1;
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}
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if (cmd[7] == 'E') {
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if (buf) {
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ast_base64encode(buf, (unsigned char *) data, strlen(data), len);
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} else {
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if (len >= 0) {
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ast_str_make_space(str, len ? len : ast_str_strlen(*str) + strlen(data) * 4 / 3 + 2);
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}
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ast_base64encode(ast_str_buffer(*str) + ast_str_strlen(*str), (unsigned char *) data, strlen(data), ast_str_size(*str) - ast_str_strlen(*str));
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ast_str_update(*str);
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}
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} else {
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int decoded_len;
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if (buf) {
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decoded_len = ast_base64decode((unsigned char *) buf, data, len);
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/* add a terminating null at the end of buf, or at the
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* end of our decoded string, which ever is less */
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buf[decoded_len <= (len - 1) ? decoded_len : len - 1] = '\0';
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} else {
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if (len >= 0) {
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ast_str_make_space(str, len ? len : ast_str_strlen(*str) + strlen(data) * 3 / 4 + 2);
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}
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decoded_len = ast_base64decode((unsigned char *) ast_str_buffer(*str) + ast_str_strlen(*str), data, ast_str_size(*str) - ast_str_strlen(*str));
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if (len)
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/* add a terminating null at the end of our
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* buffer, or at the end of our decoded string,
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* which ever is less */
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ast_str_buffer(*str)[decoded_len <= (len - 1) ? decoded_len : len - 1] = '\0';
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else
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/* space for the null is allocated above */
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ast_str_buffer(*str)[decoded_len] = '\0';
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ast_str_update(*str);
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}
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}
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return 0;
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}
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static int base64_buf_helper(struct ast_channel *chan, const char *cmd, char *data,
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char *buf, size_t len)
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{
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return base64_helper(chan, cmd, data, buf, NULL, len);
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}
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static int base64_str_helper(struct ast_channel *chan, const char *cmd, char *data,
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struct ast_str **buf, ssize_t len)
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{
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return base64_helper(chan, cmd, data, NULL, buf, len);
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}
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static struct ast_custom_function base64_encode_function = {
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.name = "BASE64_ENCODE",
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.read = base64_buf_helper,
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.read2 = base64_str_helper,
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};
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static struct ast_custom_function base64_decode_function = {
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.name = "BASE64_DECODE",
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.read = base64_buf_helper,
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.read2 = base64_str_helper,
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};
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static int unload_module(void)
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{
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return ast_custom_function_unregister(&base64_encode_function) |
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ast_custom_function_unregister(&base64_decode_function);
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}
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static int load_module(void)
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{
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return ast_custom_function_register(&base64_encode_function) |
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ast_custom_function_register(&base64_decode_function);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "base64 encode/decode dialplan functions");
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