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item_strfunc.cc
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item_strfunc.cc
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/*
Copyright (c) 2000, 2023, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
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, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
@file
@brief
This file defines all string functions
@warning
Some string functions don't always put and end-null on a String.
(This shouldn't be needed)
*/
/* May include caustic 3rd-party defs. Use early, so it can override nothing. */
#include <openssl/sha.h>
#include "item_strfunc.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_CRYPT_H
#include <crypt.h>
#endif
#include "base64.h" // base64_encode_max_arg_length
#include "my_aes.h" // MY_AES_IV_SIZE
#include "my_md5.h" // MD5_HASH_SIZE
#include "my_rnd.h" // my_rand_buffer
#include "sha1.h" // SHA1_HASH_SIZE
#include "auth_common.h" // check_password_policy
#include "des_key_file.h" // st_des_keyblock
#include "item_geofunc.h" // Item_func_geomfromgeojson
#include "password.h" // my_make_scrambled_password
#include "sql_class.h" // THD
#include "strfunc.h" // hexchar_to_int
C_MODE_START
#include "../mysys/my_static.h" // For soundex_map
C_MODE_END
#include "template_utils.h"
#include "pfs_file_provider.h"
#include "mysql/psi/mysql_file.h"
extern uint *my_aes_opmode_key_sizes;
using std::min;
using std::max;
using std::string;
using std::vector;
/*
For the Items which have only val_str_ascii() method
and don't have their own "native" val_str(),
we provide a "wrapper" method to convert from ASCII
to Item character set when it's necessary.
Conversion happens only in case of "tricky" Item character set (e.g. UCS2).
Normally conversion does not happen, and val_str_ascii() is immediately
returned instead.
*/
String *Item_str_func::val_str_from_val_str_ascii(String *str, String *str2)
{
assert(fixed == 1);
if (!(collation.collation->state & MY_CS_NONASCII))
{
String *res= val_str_ascii(str);
if (res)
res->set_charset(collation.collation);
return res;
}
assert(str != str2);
uint errors;
String *res= val_str_ascii(str);
if (!res)
return 0;
if ((null_value= str2->copy(res->ptr(), res->length(),
&my_charset_latin1, collation.collation,
&errors)))
return 0;
return str2;
}
bool Item_str_func::fix_fields(THD *thd, Item **ref)
{
bool res= Item_func::fix_fields(thd, ref);
/*
In Item_str_func::check_well_formed_result() we may set null_value
flag on the same condition as in test() below.
*/
maybe_null= (maybe_null || thd->is_strict_mode());
return res;
}
my_decimal *Item_str_func::val_decimal(my_decimal *decimal_value)
{
assert(fixed == 1);
char buff[64];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
if (!res)
return 0;
(void)str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
res->length(), res->charset(), decimal_value);
return decimal_value;
}
double Item_str_func::val_real()
{
assert(fixed == 1);
int err_not_used;
char *end_not_used, buff[64];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
return res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),
&end_not_used, &err_not_used) : 0.0;
}
longlong Item_str_func::val_int()
{
assert(fixed == 1);
int err;
char buff[22];
String *res, tmp(buff,sizeof(buff), &my_charset_bin);
res= val_str(&tmp);
return (res ?
my_strntoll(res->charset(), res->ptr(), res->length(), 10, NULL,
&err) :
(longlong) 0);
}
String *Item_func_md5::val_str_ascii(String *str)
{
assert(fixed == 1);
String * sptr= args[0]->val_str(str);
str->set_charset(&my_charset_bin);
if (sptr)
{
uchar digest[MD5_HASH_SIZE];
null_value=0;
compute_md5_hash((char *) digest, sptr->ptr(), sptr->length());
if (str->alloc(32)) // Ensure that memory is free
{
null_value=1;
return 0;
}
array_to_hex((char *) str->ptr(), digest, MD5_HASH_SIZE);
str->length((uint) 32);
return str;
}
null_value=1;
return 0;
}
/*
The MD5()/SHA() functions treat their parameter as being a case sensitive.
Thus we set binary collation on it so different instances of MD5() will be
compared properly.
*/
static CHARSET_INFO *get_checksum_charset(const char *csname)
{
CHARSET_INFO *cs= get_charset_by_csname(csname, MY_CS_BINSORT, MYF(0));
if (!cs)
{
// Charset has no binary collation: use my_charset_bin.
cs= &my_charset_bin;
}
return cs;
}
void Item_func_md5::fix_length_and_dec()
{
CHARSET_INFO *cs= get_checksum_charset(args[0]->collation.collation->csname);
args[0]->collation.set(cs, DERIVATION_COERCIBLE);
fix_length_and_charset(32, default_charset());
}
String *Item_func_sha::val_str_ascii(String *str)
{
assert(fixed == 1);
String * sptr= args[0]->val_str(str);
str->set_charset(&my_charset_bin);
if (sptr) /* If we got value different from NULL */
{
/* Temporary buffer to store 160bit digest */
uint8 digest[SHA1_HASH_SIZE];
compute_sha1_hash(digest, sptr->ptr(), sptr->length());
/* Ensure that memory is free */
if (!(str->alloc(SHA1_HASH_SIZE * 2)))
{
array_to_hex((char *) str->ptr(), digest, SHA1_HASH_SIZE);
str->length((uint) SHA1_HASH_SIZE*2);
null_value=0;
return str;
}
}
null_value=1;
return 0;
}
void Item_func_sha::fix_length_and_dec()
{
CHARSET_INFO *cs= get_checksum_charset(args[0]->collation.collation->csname);
args[0]->collation.set(cs, DERIVATION_COERCIBLE);
// size of hex representation of hash
fix_length_and_charset(SHA1_HASH_SIZE * 2, default_charset());
}
/*
SHA2(str, hash_length)
The second argument indicates the desired bit length of the
result, which must have a value of 224, 256, 384, 512, or 0
(which is equivalent to 256).
*/
String *Item_func_sha2::val_str_ascii(String *str)
{
assert(fixed == 1);
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
unsigned char digest_buf[SHA512_DIGEST_LENGTH];
uint digest_length= 0;
String *input_string= args[0]->val_str(str);
str->set_charset(&my_charset_bin);
if (input_string == NULL)
{
null_value= TRUE;
return (String *) NULL;
}
null_value= args[0]->null_value;
if (null_value)
return NULL;
const unsigned char *input_ptr=
pointer_cast<const unsigned char*>(input_string->ptr());
size_t input_len= input_string->length();
longlong hash_length= args[1]->val_int();
null_value= args[1]->null_value;
// Give error message in switch below.
if (null_value)
hash_length= -1;
switch (hash_length) {
#ifndef OPENSSL_NO_SHA512
case 512:
digest_length= SHA512_DIGEST_LENGTH;
(void) SHA512(input_ptr, input_len, digest_buf);
break;
case 384:
digest_length= SHA384_DIGEST_LENGTH;
(void) SHA384(input_ptr, input_len, digest_buf);
break;
#endif
#ifndef OPENSSL_NO_SHA256
case 224:
digest_length= SHA224_DIGEST_LENGTH;
(void) SHA224(input_ptr, input_len, digest_buf);
break;
case 256:
case 0: // SHA-256 is the default
digest_length= SHA256_DIGEST_LENGTH;
(void) SHA256(input_ptr, input_len, digest_buf);
break;
#endif
default:
// For const values we have already warned in fix_length_and_dec.
if (!args[1]->const_item())
push_warning_printf(current_thd,
Sql_condition::SL_WARNING,
ER_WRONG_PARAMETERS_TO_NATIVE_FCT,
ER(ER_WRONG_PARAMETERS_TO_NATIVE_FCT), "sha2");
null_value= TRUE;
return NULL;
}
/*
Since we're subverting the usual String methods, we must make sure that
the destination has space for the bytes we're about to write.
*/
str->mem_realloc(digest_length*2 + 1); /* Each byte as two nybbles */
/* Convert the large number to a string-hex representation. */
array_to_hex((char *) str->ptr(), digest_buf, digest_length);
/* We poked raw bytes in. We must inform the the String of its length. */
str->length(digest_length*2); /* Each byte as two nybbles */
null_value= FALSE;
return str;
#else
push_warning_printf(current_thd,
Sql_condition::SL_WARNING,
ER_FEATURE_DISABLED,
ER(ER_FEATURE_DISABLED),
"sha2", "--with-ssl");
null_value= TRUE;
return (String *) NULL;
#endif /* defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY) */
}
void Item_func_sha2::fix_length_and_dec()
{
maybe_null = 1;
max_length = 0;
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
longlong sha_variant;
if (args[1]->const_item())
{
sha_variant= args[1]->val_int();
// Give error message in switch below.
if (args[1]->null_value)
sha_variant= -1;
}
else
{
sha_variant= 512;
}
switch (sha_variant) {
#ifndef OPENSSL_NO_SHA512
case 512:
fix_length_and_charset(SHA512_DIGEST_LENGTH * 2, default_charset());
break;
case 384:
fix_length_and_charset(SHA384_DIGEST_LENGTH * 2, default_charset());
break;
#endif
#ifndef OPENSSL_NO_SHA256
case 256:
case 0: // SHA-256 is the default
fix_length_and_charset(SHA256_DIGEST_LENGTH * 2, default_charset());
break;
case 224:
fix_length_and_charset(SHA224_DIGEST_LENGTH * 2, default_charset());
break;
#endif
default:
fix_length_and_charset(SHA256_DIGEST_LENGTH * 2, default_charset());
push_warning_printf(current_thd,
Sql_condition::SL_WARNING,
ER_WRONG_PARAMETERS_TO_NATIVE_FCT,
ER(ER_WRONG_PARAMETERS_TO_NATIVE_FCT), "sha2");
}
CHARSET_INFO *cs= get_checksum_charset(args[0]->collation.collation->csname);
args[0]->collation.set(cs, DERIVATION_COERCIBLE);
#else
push_warning_printf(current_thd,
Sql_condition::SL_WARNING,
ER_FEATURE_DISABLED,
ER(ER_FEATURE_DISABLED),
"sha2", "--with-ssl");
#endif /* defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY) */
}
/* Implementation of AES encryption routines */
/** Helper class to retrieve KDF options for aes_encrypt/aes_decrypt. */
const int max_kdf_option_size = 256;
const int max_kdf_iterations_size = 65535;
const int min_kdf_iterations_size =1000;
class kdf_argument {
char tmp_option_buff[max_kdf_option_size];
String tmp_option_value;
public:
kdf_argument()
: tmp_option_value(tmp_option_buff, sizeof(tmp_option_buff),
system_charset_info) {
memset(tmp_option_buff, '\0', max_kdf_option_size);
}
bool parse_kdf_option(String *kdf_option_value, string &kdf_option,
my_bool *error_generated, const size_t max_size_allowed) {
/*
For large KDF option value, KDF option value will be set as NULL by
function callers.
It gives warning: Warning | 1301 | Result of repeat() was
larger than max_allowed_packet (16777216) - truncated Here arg_count >
KDF option value as NULL will be treated as invalid KDF option value.
*/
if (!kdf_option_value) {
my_error(ER_AES_INVALID_KDF_OPTION_SIZE, MYF(0), max_size_allowed);
*error_generated = TRUE;
return FALSE;
}
if (kdf_option_value->length() > (max_size_allowed - 1)) {
my_error(ER_AES_INVALID_KDF_OPTION_SIZE, MYF(0), max_size_allowed);
*error_generated = TRUE;
return FALSE;
}
kdf_option = kdf_option_value->ptr();
return TRUE;
}
/**
Validate the options and retrieve the KDF options value.
@param arg_count number of parameters passed to the function
@param args array of arguments passed to the function
@param func_name the name of the function (for errors)
@param [out] error_generated set to true if error was generated.
@return retrieved KDF option values
*/
vector<string> retrieve_kdf_options(uint arg_count, Item **args,
const char *func_name,
my_bool *error_generated) {
vector<string> kdf_options;
String *kdf_option_value = NULL;
string kdf_option;
*error_generated = FALSE;
if (arg_count > 3) {
kdf_option_value = args[3]->val_str(&tmp_option_value);
} else {
return kdf_options;
}
// KDF funtion name
if (!parse_kdf_option(kdf_option_value, kdf_option, error_generated,
max_kdf_option_size))
return kdf_options;
// KDF function name should be valid
#if OPENSSL_VERSION_NUMBER < 0x10100000L
if (kdf_option == "pbkdf2_hmac") {
#else
if (kdf_option == "hkdf" || kdf_option == "pbkdf2_hmac") {
#endif
kdf_options.push_back(kdf_option);
} else {
my_error(ER_AES_INVALID_KDF_NAME, MYF(0), func_name);
*error_generated = TRUE;
return kdf_options;
}
kdf_option_value = NULL;
if (arg_count > 4) {
kdf_option_value = args[4]->val_str(&tmp_option_value);
} else {
return kdf_options;
}
// For hkdf and pbkdf2_hmac option 1 is salt
if (!parse_kdf_option(kdf_option_value, kdf_option, error_generated,
max_kdf_option_size))
return kdf_options;
kdf_options.push_back(kdf_option);
kdf_option_value = NULL;
if (arg_count > 5) {
kdf_option_value = args[5]->val_str(&tmp_option_value);
} else {
return kdf_options;
}
// For hkdf option 2 is info
// For pbkdf2_hmac option 2 is iterations
size_t max_size_allowed = max_kdf_option_size;
if (kdf_options[0] == "pbkdf2_hmac") {
// 4 bytes for integer (65535).
max_size_allowed = 6;
}
if (!parse_kdf_option(kdf_option_value, kdf_option, error_generated,
max_size_allowed))
return kdf_options;
kdf_options.push_back(kdf_option);
if ((kdf_options[0] == "pbkdf2_hmac") && (kdf_options.size() > 2)) {
int iter = atoi(kdf_options[2].c_str());
if (iter < min_kdf_iterations_size || iter > max_kdf_iterations_size) {
*error_generated = true;
my_error(ER_AES_INVALID_KDF_ITERATIONS, MYF(0), func_name);
}
}
return kdf_options;
}
};
/** helper class to process an IV argument to aes_encrypt/aes_decrypt */
class iv_argument
{
char iv_buff[MY_AES_IV_SIZE + 1]; // +1 to cater for the terminating NULL
String tmp_iv_value;
public:
iv_argument() :
tmp_iv_value(iv_buff, sizeof(iv_buff), system_charset_info)
{}
/**
Validate the arguments and retrieve the IV value.
Processes a 3d optional IV argument to an Item_func function.
Contains all the necessary stack buffers etc.
@param aes_opmode the encryption mode
@param arg_count number of parameters passed to the function
@param args array of arguments passed to the function
@param func_name the name of the function (for errors)
@param thd the current thread (for errors)
@param [out] error_generated set to true if error was generated.
@return a pointer to the retrived validated IV or NULL
*/
const unsigned char *retrieve_iv_ptr(enum my_aes_opmode aes_opmode,
uint arg_count,
Item **args,
const char *func_name,
THD *thd,
my_bool *error_generated)
{
const unsigned char *iv_str= NULL;
*error_generated= FALSE;
if (my_aes_needs_iv(aes_opmode))
{
/* we only enforce the need for IV */
if (arg_count > 2)
{
String *iv= args[2]->val_str(&tmp_iv_value);
if (!iv || iv->length() < MY_AES_IV_SIZE)
{
my_error(ER_AES_INVALID_IV, MYF(0), func_name, (long long) MY_AES_IV_SIZE);
*error_generated= TRUE;
return NULL;
}
iv_str= (unsigned char *) iv->ptr();
}
else
{
my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), func_name);
*error_generated= TRUE;
return NULL;
}
}
else
{
if (arg_count == 3)
{
push_warning_printf(thd, Sql_condition::SL_WARNING,
WARN_OPTION_IGNORED,
ER(WARN_OPTION_IGNORED), "IV");
}
}
return iv_str;
}
};
bool Item_func_aes_encrypt::itemize(Parse_context *pc, Item **res)
{
if (skip_itemize(res))
return false;
if (super::itemize(pc, res))
return true;
/* Unsafe for SBR since result depends on a session variable */
pc->thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
/* Not safe to cache either */
pc->thd->lex->set_uncacheable(pc->select, UNCACHEABLE_SIDEEFFECT);
return false;
}
String *Item_func_aes_encrypt::val_str(String *str)
{
assert(fixed == 1);
char key_buff[80] = {'\0'};
String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
String *sptr, *key;
int aes_length;
THD *thd= current_thd;
ulong aes_opmode;
iv_argument iv_arg;
DBUG_ENTER("Item_func_aes_encrypt::val_str");
sptr= args[0]->val_str(str); // String to encrypt
key= args[1]->val_str(&tmp_key_value); // key
aes_opmode= thd->variables.my_aes_mode;
assert(aes_opmode <= MY_AES_END);
if (sptr && key) // we need both arguments to be not NULL
{
const unsigned char *iv_str=
iv_arg.retrieve_iv_ptr((enum my_aes_opmode) aes_opmode, arg_count, args,
func_name(), thd, &null_value);
if (null_value)
DBUG_RETURN(NULL);
vector<string> kdf_options;
kdf_argument kdf_arg;
kdf_options =
kdf_arg.retrieve_kdf_options(arg_count, args, func_name(), &null_value);
if (null_value) {
DBUG_RETURN(NULL);
}
// Calculate result length
aes_length= my_aes_get_size(sptr->length(),
(enum my_aes_opmode) aes_opmode);
str_value.set_charset(&my_charset_bin);
const uint rkey_size = my_aes_opmode_key_sizes[aes_opmode] / 8;
uint key_size = key->length();
if ((key_size > rkey_size) && (kdf_options.size() == 0)) {
push_warning_printf(thd, Sql_condition::SL_WARNING, WARN_AES_KEY_SIZE,
ER_THD(thd, WARN_AES_KEY_SIZE), rkey_size);
}
if (!str_value.alloc(aes_length)) // Ensure that memory is free
{
// finally encrypt directly to allocated buffer.
if (my_aes_encrypt((unsigned char *)sptr->ptr(), sptr->length(),
(unsigned char *)str_value.ptr(),
(unsigned char *)key->ptr(), key->length(),
(enum my_aes_opmode)aes_opmode, iv_str, true,
(kdf_options.size() > 0) ? &kdf_options : NULL) ==
aes_length)
{
// We got the expected result length
str_value.length((uint) aes_length);
DBUG_RETURN(&str_value);
}
}
}
null_value=1;
DBUG_RETURN(0);
}
void Item_func_aes_encrypt::fix_length_and_dec()
{
ulong aes_opmode= current_thd->variables.my_aes_mode;
assert(aes_opmode <= MY_AES_END);
max_length=my_aes_get_size(args[0]->max_length,
(enum my_aes_opmode) aes_opmode);
}
bool Item_func_aes_decrypt::itemize(Parse_context *pc, Item **res)
{
if (skip_itemize(res))
return false;
if (super::itemize(pc, res))
return true;
/* Unsafe for SBR since result depends on a session variable */
pc->thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
/* Not safe to cache either */
pc->thd->lex->set_uncacheable(pc->select, UNCACHEABLE_SIDEEFFECT);
return false;
}
String *Item_func_aes_decrypt::val_str(String *str)
{
assert(fixed == 1);
char key_buff[80];
String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
String *sptr, *key;
THD *thd= current_thd;
ulong aes_opmode;
iv_argument iv_arg;
DBUG_ENTER("Item_func_aes_decrypt::val_str");
sptr= args[0]->val_str(str); // String to decrypt
key= args[1]->val_str(&tmp_key_value); // Key
aes_opmode= thd->variables.my_aes_mode;
assert(aes_opmode <= MY_AES_END);
if (sptr && key) // Need to have both arguments not NULL
{
const unsigned char *iv_str=
iv_arg.retrieve_iv_ptr((enum my_aes_opmode) aes_opmode, arg_count, args,
func_name(), thd, &null_value);
if (null_value)
DBUG_RETURN(NULL);
str_value.set_charset(&my_charset_bin);
if (!str_value.alloc(sptr->length())) // Ensure that memory is free
{
vector<string> kdf_options;
kdf_argument kdf_arg;
kdf_options = kdf_arg.retrieve_kdf_options(arg_count, args, func_name(),
&null_value);
if (null_value) {
DBUG_RETURN(NULL);
}
// finally decrypt directly to allocated buffer.
int length;
length = my_aes_decrypt(
(unsigned char *)sptr->ptr(), sptr->length(),
(unsigned char *)str_value.ptr(), (unsigned char *)key->ptr(),
key->length(), (enum my_aes_opmode)aes_opmode, iv_str, true,
(kdf_options.size() > 0) ? &kdf_options : NULL);
if (length >= 0) // if we got correct data data
{
str_value.length((uint) length);
DBUG_RETURN(&str_value);
}
}
}
// Bad parameters. No memory or bad data will all go here
null_value=1;
DBUG_RETURN(0);
}
void Item_func_aes_decrypt::fix_length_and_dec()
{
max_length=args[0]->max_length;
maybe_null= 1;
}
bool Item_func_random_bytes::itemize(Parse_context *pc, Item **res)
{
if (skip_itemize(res))
return false;
if (super::itemize(pc, res))
return true;
/* it is unsafe for SBR since it uses crypto random from the ssl library */
pc->thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
/* Not safe to cache either */
pc->thd->lex->set_uncacheable(pc->select, UNCACHEABLE_RAND);
return false;
}
/*
Artificially limited to 1k to avoid excessive memory usage.
The SSL lib supports up to INT_MAX.
*/
const longlong Item_func_random_bytes::MAX_RANDOM_BYTES_BUFFER= 1024;
void Item_func_random_bytes::fix_length_and_dec()
{
collation.set(&my_charset_bin);
max_length= MAX_RANDOM_BYTES_BUFFER;
}
String *Item_func_random_bytes::val_str(String *a)
{
assert(fixed == 1);
longlong n_bytes= args[0]->val_int();
null_value= args[0]->null_value;
if (null_value)
return NULL;
str_value.set_charset(&my_charset_bin);
if (n_bytes <= 0 || n_bytes > MAX_RANDOM_BYTES_BUFFER)
{
my_error(ER_DATA_OUT_OF_RANGE, MYF(0), "length", func_name());
null_value= TRUE;
return NULL;
}
if (str_value.alloc(n_bytes))
{
my_error(ER_OUTOFMEMORY, n_bytes);
null_value= TRUE;
return NULL;
}
str_value.set_charset(&my_charset_bin);
if (my_rand_buffer((unsigned char *) str_value.ptr(), n_bytes))
{
my_error(ER_ERROR_WHEN_EXECUTING_COMMAND, MYF(0), func_name(),
"SSL library can't generate random bytes");
null_value= TRUE;
return NULL;
}
str_value.length(n_bytes);
return &str_value;
}
void Item_func_to_base64::fix_length_and_dec()
{
maybe_null= args[0]->maybe_null;
collation.set(default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII);
if (args[0]->max_length > (uint) base64_encode_max_arg_length())
{
maybe_null= 1;
fix_char_length_ulonglong((ulonglong) base64_encode_max_arg_length());
}
else
{
uint64 length= base64_needed_encoded_length((uint64) args[0]->max_length);
assert(length > 0);
fix_char_length_ulonglong((ulonglong) length - 1);
}
}
String *Item_func_to_base64::val_str_ascii(String *str)
{
String *res= args[0]->val_str(str);
bool too_long= false;
uint64 length;
if (!res ||
res->length() > (uint) base64_encode_max_arg_length() ||
(too_long=
((length= base64_needed_encoded_length((uint64) res->length())) >
current_thd->variables.max_allowed_packet)) ||
tmp_value.alloc((uint) length))
{
null_value= 1; // NULL input, too long input, or OOM.
if (too_long)
{
push_warning_printf(current_thd, Sql_condition::SL_WARNING,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
current_thd->variables.max_allowed_packet);
}
return 0;
}
base64_encode(res->ptr(), (int) res->length(), (char*) tmp_value.ptr());
assert(length > 0);
tmp_value.length((uint) length - 1); // Without trailing '\0'
null_value= 0;
return &tmp_value;
}
void Item_func_from_base64::fix_length_and_dec()
{
if (args[0]->max_length > (uint) base64_decode_max_arg_length())
{
fix_char_length_ulonglong((ulonglong) base64_decode_max_arg_length());
}
else
{
uint64 length= base64_needed_decoded_length((uint64) args[0]->max_length);
fix_char_length_ulonglong((ulonglong) length);
}
maybe_null= 1; // Can be NULL, e.g. in case of badly formed input string
}
String *Item_func_from_base64::val_str(String *str)
{
String *res= args[0]->val_str_ascii(str);
bool too_long= false;
int64 length;
const char *end_ptr;
if (!res ||
res->length() > (uint) base64_decode_max_arg_length() ||
(too_long=
((uint64) (length= base64_needed_decoded_length((uint64) res->length())) >
current_thd->variables.max_allowed_packet)) ||
tmp_value.alloc((uint) length) ||
(length= base64_decode(res->ptr(), (uint64) res->length(),
(char *) tmp_value.ptr(), &end_ptr, 0)) < 0 ||
end_ptr < res->ptr() + res->length())
{
null_value= 1; // NULL input, too long input, OOM, or badly formed input
if (too_long)
{
push_warning_printf(current_thd, Sql_condition::SL_WARNING,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
current_thd->variables.max_allowed_packet);
}
return 0;
}
tmp_value.length((uint) length);
null_value= 0;
return &tmp_value;
}
/**
Concatenate args with the following premises:
If only one arg (which is ok), return value of arg;
Don't reallocate val_str() if not absolute necessary.
*/
String *Item_func_concat::val_str(String *str) {
assert(fixed == 1);
String *res;
THD *thd = current_thd;
null_value = false;
tmp_value.length(0);
for (uint i = 0; i < arg_count; ++i) {
if (!(res = args[i]->val_str(str))) {
null_value = 1;
return 0;
}
if (res->length() + tmp_value.length() >
thd->variables.max_allowed_packet) {
push_warning_printf(thd, Sql_condition::SL_WARNING,
ER_WARN_ALLOWED_PACKET_OVERFLOWED,
ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
thd->variables.max_allowed_packet);
null_value = 1;
return 0;
}
if (tmp_value.append(*res)) {
null_value = 1;
return 0;
}
}
res = &tmp_value;
res->set_charset(collation.collation);
return res;
}
void Item_func_concat::fix_length_and_dec()
{
ulonglong char_length= 0;
if (agg_arg_charsets_for_string_result(collation, args, arg_count))
return;
for (uint i=0 ; i < arg_count ; i++) {
args[i]->cmp_context = STRING_RESULT;
char_length+= args[i]->max_char_length();
}
fix_char_length_ulonglong(char_length);
}
/**
@details
Function des_encrypt() by tonu@spam.ee & monty
Works only if compiled with OpenSSL library support.
@return
A binary string where first character is CHAR(128 | key-number).
If one uses a string key key_number is 127.
Encryption result is longer than original by formula:
@code new_length= org_length + (8-(org_length % 8))+1 @endcode
*/
String *Item_func_des_encrypt::val_str(String *str)
{
assert(fixed == 1);
#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)
uint code= ER_WRONG_PARAMETERS_TO_PROCEDURE;
DES_cblock ivec;
struct st_des_keyblock keyblock;
struct st_des_keyschedule keyschedule;
const char *append_str="********";
uint key_number, tail;
size_t res_length;
String *res= args[0]->val_str(str);