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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2005 - 2006, Digium, Inc.
* Copyright (C) 2005, Claude Patry
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Use the base64 as functions
*
* \ingroup functions
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/module.h"
#include "asterisk/pbx.h" /* function register/unregister */
#include "asterisk/utils.h"
#include "asterisk/strings.h"
/*** DOCUMENTATION
<function name="BASE64_ENCODE" language="en_US">
<synopsis>
Encode a string in base64.
</synopsis>
<syntax>
<parameter name="string" required="true">
<para>Input string</para>
</parameter>
</syntax>
<description>
<para>Returns the base64 string.</para>
</description>
<see-also>
<ref type="function">BASE64_DECODE</ref>
<ref type="function">AES_DECRYPT</ref>
<ref type="function">AES_ENCRYPT</ref>
</see-also>
</function>
<function name="BASE64_DECODE" language="en_US">
<synopsis>
Decode a base64 string.
</synopsis>
<syntax>
<parameter name="string" required="true">
<para>Input string.</para>
</parameter>
</syntax>
<description>
<para>Returns the plain text string.</para>
</description>
<see-also>
<ref type="function">BASE64_ENCODE</ref>
<ref type="function">AES_DECRYPT</ref>
<ref type="function">AES_ENCRYPT</ref>
</see-also>
</function>
***/
static int base64_helper(struct ast_channel *chan, const char *cmd, char *data,
char *buf, struct ast_str **str, ssize_t len)
{
if (ast_strlen_zero(data)) {
ast_log(LOG_WARNING, "Syntax: %s(<data>) - missing argument!\n", cmd);
return -1;
}
if (cmd[7] == 'E') {
if (buf) {
ast_base64encode(buf, (unsigned char *) data, strlen(data), len);
} else {
if (len >= 0) {
ast_str_make_space(str, len ? len : ast_str_strlen(*str) + strlen(data) * 4 / 3 + 2);
}
ast_base64encode(ast_str_buffer(*str) + ast_str_strlen(*str), (unsigned char *) data, strlen(data), ast_str_size(*str) - ast_str_strlen(*str));
ast_str_update(*str);
}
} else {
int decoded_len;
if (buf) {
decoded_len = ast_base64decode((unsigned char *) buf, data, len);
/* add a terminating null at the end of buf, or at the
* end of our decoded string, which ever is less */
buf[decoded_len <= (len - 1) ? decoded_len : len - 1] = '\0';
} else {
if (len >= 0) {
ast_str_make_space(str, len ? len : ast_str_strlen(*str) + strlen(data) * 3 / 4 + 2);
}
decoded_len = ast_base64decode((unsigned char *) ast_str_buffer(*str) + ast_str_strlen(*str), data, ast_str_size(*str) - ast_str_strlen(*str));
if (len)
/* add a terminating null at the end of our
* buffer, or at the end of our decoded string,
* which ever is less */
ast_str_buffer(*str)[decoded_len <= (len - 1) ? decoded_len : len - 1] = '\0';
else
/* space for the null is allocated above */
ast_str_buffer(*str)[decoded_len] = '\0';
ast_str_update(*str);
}
}
return 0;
}
static int base64_buf_helper(struct ast_channel *chan, const char *cmd, char *data,
char *buf, size_t len)
{
return base64_helper(chan, cmd, data, buf, NULL, len);
}
static int base64_str_helper(struct ast_channel *chan, const char *cmd, char *data,
struct ast_str **buf, ssize_t len)
{
return base64_helper(chan, cmd, data, NULL, buf, len);
}
static struct ast_custom_function base64_encode_function = {
.name = "BASE64_ENCODE",
.read = base64_buf_helper,
.read2 = base64_str_helper,
};
static struct ast_custom_function base64_decode_function = {
.name = "BASE64_DECODE",
.read = base64_buf_helper,
.read2 = base64_str_helper,
};
static int unload_module(void)
{
return ast_custom_function_unregister(&base64_encode_function) |
ast_custom_function_unregister(&base64_decode_function);
}
static int load_module(void)
{
return ast_custom_function_register(&base64_encode_function) |
ast_custom_function_register(&base64_decode_function);
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "base64 encode/decode dialplan functions");
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