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/* Copyright (C) 2005-2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 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 */
#include "mysql_priv.h"
#include "base64.h"
/*
Execute a BINLOG statement
TODO: This currently assumes a MySQL 5.x binlog.
When we'll have binlog with a different format, to execute the
BINLOG command properly the server will need to know which format
the BINLOG command's event is in. mysqlbinlog should then send
the Format_description_log_event of the binlog it reads and the
server thread should cache this format into
rli->description_event_for_exec.
*/
void mysql_client_binlog_statement(THD* thd)
{
DBUG_ENTER("mysql_client_binlog_statement");
DBUG_PRINT("info",("binlog base64: '%*s'",
(thd->lex->comment.length < 2048 ?
thd->lex->comment.length : 2048),
thd->lex->comment.str));
/*
Temporarily turn off send_ok, since different events handle this
differently
*/
my_bool nsok= thd->net.no_send_ok;
thd->net.no_send_ok= TRUE;
my_size_t coded_len= thd->lex->comment.length + 1;
my_size_t decoded_len= base64_needed_decoded_length(coded_len);
DBUG_ASSERT(coded_len > 0);
/*
Allocation
*/
if (!thd->rli_fake)
thd->rli_fake= new RELAY_LOG_INFO;
const Format_description_log_event *desc=
new Format_description_log_event(4);
const char *error= 0;
char *buf= (char *) my_malloc(decoded_len, MYF(MY_WME));
Log_event *ev = 0;
/*
Out of memory check
*/
if (!(thd->rli_fake && desc && buf))
{
my_error(ER_OUTOFMEMORY, MYF(0), 1); /* needed 1 bytes */
goto end;
}
thd->rli_fake->sql_thd= thd;
thd->rli_fake->no_storage= TRUE;
for (char const *strptr= thd->lex->comment.str ;
strptr < thd->lex->comment.str + thd->lex->comment.length ; )
{
char const *endptr= 0;
int bytes_decoded= base64_decode(strptr, coded_len, buf, &endptr);
#ifndef HAVE_purify
/*
This debug printout should not be used for valgrind builds
since it will read from unassigned memory.
*/
DBUG_PRINT("info",
("bytes_decoded: %d strptr: 0x%lx endptr: 0x%lx ('%c':%d)",
bytes_decoded, (long) strptr, (long) endptr, *endptr,
*endptr));
#endif
if (bytes_decoded < 0)
{
my_error(ER_BASE64_DECODE_ERROR, MYF(0));
goto end;
}
else if (bytes_decoded == 0)
break; // If no bytes where read, the string contained only whitespace
DBUG_ASSERT(bytes_decoded > 0);
DBUG_ASSERT(endptr > strptr);
coded_len-= endptr - strptr;
strptr= endptr;
/*
Now we have one or more events stored in the buffer. The size of
the buffer is computed based on how much base64-encoded data
there were, so there should be ample space for the data (maybe
even too much, since a statement can consist of a considerable
number of events).
TODO: Switch to use a stream-based base64 encoder/decoder in
order to be able to read exactly what is necessary.
*/
DBUG_PRINT("info",("binlog base64 decoded_len: %lu bytes_decoded: %d",
(ulong) decoded_len, bytes_decoded));
/*
Now we start to read events of the buffer, until there are no
more.
*/
for (char *bufptr= buf ; bytes_decoded > 0 ; )
{
/*
Checking that the first event in the buffer is not truncated.
*/
ulong event_len= uint4korr(bufptr + EVENT_LEN_OFFSET);
DBUG_PRINT("info", ("event_len=%lu, bytes_decoded=%d",
event_len, bytes_decoded));
if (bytes_decoded < EVENT_LEN_OFFSET || (uint) bytes_decoded < event_len)
{
my_error(ER_SYNTAX_ERROR, MYF(0));
goto end;
}
ev= Log_event::read_log_event(bufptr, event_len, &error, desc);
DBUG_PRINT("info",("binlog base64 err=%s", error));
if (!ev)
{
/*
This could actually be an out-of-memory, but it is more likely
causes by a bad statement
*/
my_error(ER_SYNTAX_ERROR, MYF(0));
goto end;
}
bytes_decoded -= event_len;
bufptr += event_len;
DBUG_PRINT("info",("ev->get_type_code()=%d", ev->get_type_code()));
#ifndef HAVE_purify
/*
This debug printout should not be used for valgrind builds
since it will read from unassigned memory.
*/
DBUG_PRINT("info",("bufptr+EVENT_TYPE_OFFSET: 0x%lx",
(long) (bufptr+EVENT_TYPE_OFFSET)));
DBUG_PRINT("info", ("bytes_decoded: %d bufptr: 0x%lx buf[EVENT_LEN_OFFSET]: %lu",
bytes_decoded, (long) bufptr,
(ulong) uint4korr(bufptr+EVENT_LEN_OFFSET)));
#endif
ev->thd= thd;
if (IF_DBUG(int err= ) ev->exec_event(thd->rli_fake))
{
DBUG_PRINT("error", ("exec_event() returned: %d", err));
/*
TODO: Maybe a better error message since the BINLOG statement
now contains several events.
*/
my_error(ER_UNKNOWN_ERROR, MYF(0), "Error executing BINLOG statement");
goto end;
}
delete ev;
ev= 0;
}
}
/*
Restore setting of no_send_ok
*/
thd->net.no_send_ok= nsok;
DBUG_PRINT("info",("binlog base64 execution finished successfully"));
send_ok(thd);
end:
/*
Restore setting of no_send_ok
*/
thd->net.no_send_ok= nsok;
delete desc;
my_free(buf, MYF(MY_ALLOW_ZERO_PTR));
DBUG_VOID_RETURN;
}
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