c97d2c94eb
The resultset processing for MySQL requires some extra work as it lacks the proper SERVER_MORE_RESULTS_EXIST flag in the last EOF packet. Instead, the first EOF packet has the SERVER_PS_OUT_PARAMS flag which needs to be interpreted as a SERVER_MORE_RESULTS_EXIST flag for the second EOF packet. Also corrected the EOF packet handling to do the flag checks in the code that deals with the EOF packets. As the modutil_state parameter is now used for more than large packet tracking, the correct solution is to store this state object in the readwritesplit session instead of interpreting it to a boolean value.
1483 lines
41 KiB
C++
1483 lines
41 KiB
C++
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file modutil.c - Implementation of useful routines for modules
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*/
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#include <string.h>
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#include <strings.h>
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#include <maxscale/alloc.h>
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#include <maxscale/buffer.h>
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#include <maxscale/modutil.h>
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#include <maxscale/platform.h>
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#include <maxscale/poll.h>
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#include <maxscale/protocol/mysql.h>
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#include <maxscale/utils.h>
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#include <maxscale/mysql_utils.h>
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/** These are used when converting MySQL wildcards to regular expressions */
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static SPINLOCK re_lock = SPINLOCK_INIT;
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static bool pattern_init = false;
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static pcre2_code *re_percent = NULL;
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static pcre2_code *re_single = NULL;
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static pcre2_code *re_escape = NULL;
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static const PCRE2_SPTR pattern_percent = (PCRE2_SPTR) "%";
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static const PCRE2_SPTR pattern_single = (PCRE2_SPTR) "([^\\\\]|^)_";
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static const PCRE2_SPTR pattern_escape = (PCRE2_SPTR) "[.]";
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static const char* sub_percent = ".*";
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static const char* sub_single = "$1.";
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static const char* sub_escape = "\\.";
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static void modutil_reply_routing_error(
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DCB* backend_dcb,
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int error,
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const char* state,
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char* errstr,
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uint32_t flags);
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/**
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* Check if a GWBUF structure is a MySQL COM_QUERY packet
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*
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* @param buf Buffer to check
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* @return True if GWBUF is a COM_QUERY packet
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*/
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int
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modutil_is_SQL(GWBUF *buf)
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{
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unsigned char *ptr;
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if (GWBUF_LENGTH(buf) < 5)
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{
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return 0;
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}
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ptr = GWBUF_DATA(buf);
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return ptr[4] == 0x03; // COM_QUERY
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}
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/**
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* Check if a GWBUF structure is a MySQL COM_STMT_PREPARE packet
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*
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* @param buf Buffer to check
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* @return True if GWBUF is a COM_STMT_PREPARE packet
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*/
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int
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modutil_is_SQL_prepare(GWBUF *buf)
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{
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unsigned char *ptr;
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if (GWBUF_LENGTH(buf) < 5)
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{
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return 0;
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}
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ptr = GWBUF_DATA(buf);
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return ptr[4] == 0x16 ; // COM_STMT_PREPARE
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}
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/**
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* Extract the SQL portion of a COM_QUERY packet
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*
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* NB This sets *sql to point into the packet and does not
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* allocate any new storage. The string pointed to by *sql is
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* not NULL terminated.
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*
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* This routine is very simplistic and does not deal with SQL text
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* that spans multiple buffers.
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*
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* The length returned is the complete length of the SQL, which may
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* be larger than the amount of data in this packet.
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*
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* @param buf The packet buffer
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* @param sql Pointer that is set to point at the SQL data
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* @param length Length of the SQL query data
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* @return True if the packet is a COM_QUERY packet
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*/
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int
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modutil_extract_SQL(GWBUF *buf, char **sql, int *length)
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{
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unsigned char *ptr;
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if (!modutil_is_SQL(buf) && !modutil_is_SQL_prepare(buf))
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{
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return 0;
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}
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ptr = GWBUF_DATA(buf);
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*length = *ptr++;
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*length += (*ptr++ << 8);
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*length += (*ptr++ << 16);
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ptr += 2; // Skip sequence id and COM_QUERY byte
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*length = *length - 1;
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*sql = (char *)ptr;
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return 1;
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}
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/**
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* Extract the SQL portion of a COM_QUERY packet
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*
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* NB This sets *sql to point into the packet and does not
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* allocate any new storage. The string pointed to by *sql is
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* not NULL terminated.
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*
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* The number of bytes pointed to *sql is returned in *length
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*
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* The remaining number of bytes required for the complete query string
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* are returned in *residual
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*
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* @param buf The packet buffer
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* @param sql Pointer that is set to point at the SQL data
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* @param length Length of the SQL query data pointed to by sql
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* @param residual Any remain part of the query in future packets
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* @return True if the packet is a COM_QUERY packet
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*/
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int
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modutil_MySQL_Query(GWBUF *buf, char **sql, int *length, int *residual)
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{
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unsigned char *ptr;
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if (!modutil_is_SQL(buf))
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{
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return 0;
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}
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ptr = GWBUF_DATA(buf);
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*residual = *ptr++;
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*residual += (*ptr++ << 8);
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*residual += (*ptr++ << 16);
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ptr += 2; // Skip sequence id and COM_QUERY byte
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*residual = *residual - 1;
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*length = GWBUF_LENGTH(buf) - 5;
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*residual -= *length;
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*sql = (char *)ptr;
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return 1;
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}
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/**
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* Calculate the length of MySQL packet and how much is missing from the GWBUF
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* passed as parameter.
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*
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* This routine assumes that there is only one MySQL packet in the buffer.
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*
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* @param buf buffer list including the query, may consist of
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* multiple buffers
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* @param nbytes_missing pointer to missing bytecount
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*
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* @return the length of MySQL packet and writes missing bytecount to
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* nbytes_missing.
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*/
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int modutil_MySQL_query_len(GWBUF* buf, int* nbytes_missing)
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{
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int len;
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int buflen;
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if (!modutil_is_SQL(buf))
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{
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len = 0;
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goto retblock;
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}
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len = MYSQL_GET_PAYLOAD_LEN((uint8_t *)GWBUF_DATA(buf));
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*nbytes_missing = len - 1;
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buflen = gwbuf_length(buf);
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*nbytes_missing -= buflen - 5;
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retblock:
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return len;
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}
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/**
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* Replace the contents of a GWBUF with the new SQL statement passed as a text string.
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* The routine takes care of the modification needed to the MySQL packet,
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* returning a GWBUF chain that can be used to send the data to a MySQL server
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*
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* @param orig The original request in a GWBUF
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* @param sql The SQL text to replace in the packet
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* @return A newly formed GWBUF containing the MySQL packet.
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*/
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GWBUF *
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modutil_replace_SQL(GWBUF *orig, char *sql)
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{
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unsigned char *ptr;
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int length, newlength;
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GWBUF *addition;
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if (!modutil_is_SQL(orig))
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{
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return NULL;
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}
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ptr = GWBUF_DATA(orig);
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length = *ptr++;
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length += (*ptr++ << 8);
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length += (*ptr++ << 16);
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ptr += 2; // Skip sequence id and COM_QUERY byte
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newlength = strlen(sql);
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if (length - 1 == newlength)
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{
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/* New SQL is the same length as old */
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memcpy(ptr, sql, newlength);
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}
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else if (length - 1 > newlength)
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{
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/* New SQL is shorter */
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memcpy(ptr, sql, newlength);
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GWBUF_RTRIM(orig, (length - 1) - newlength);
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ptr = GWBUF_DATA(orig);
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*ptr++ = (newlength + 1) & 0xff;
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*ptr++ = ((newlength + 1) >> 8) & 0xff;
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*ptr++ = ((newlength + 1) >> 16) & 0xff;
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}
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else
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{
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memcpy(ptr, sql, length - 1);
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addition = gwbuf_alloc(newlength - (length - 1));
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memcpy(GWBUF_DATA(addition), &sql[length - 1], newlength - (length - 1));
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ptr = GWBUF_DATA(orig);
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*ptr++ = (newlength + 1) & 0xff;
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*ptr++ = ((newlength + 1) >> 8) & 0xff;
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*ptr++ = ((newlength + 1) >> 16) & 0xff;
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addition->gwbuf_type = orig->gwbuf_type;
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orig->next = addition;
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}
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return orig;
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}
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/**
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* Extract the SQL from a COM_QUERY packet and return in a NULL terminated buffer.
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* The buffer should be freed by the caller when it is no longer required.
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*
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* If the packet is not a COM_QUERY packet then the function will return NULL
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*
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* @param buf The buffer chain
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* @return Null terminated string containing query text or NULL on error
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*/
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char *
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modutil_get_SQL(GWBUF *buf)
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{
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unsigned int len, length;
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unsigned char *ptr;
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char *dptr, *rval = NULL;
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if (modutil_is_SQL(buf) || modutil_is_SQL_prepare(buf) ||
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MYSQL_IS_COM_INIT_DB((uint8_t*)GWBUF_DATA(buf)))
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{
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ptr = GWBUF_DATA(buf);
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length = *ptr++;
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length += (*ptr++ << 8);
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length += (*ptr++ << 16);
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rval = (char *) MXS_MALLOC(length + 1);
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if (rval)
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{
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dptr = rval;
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ptr += 2; // Skip sequence id and COM_QUERY byte
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len = GWBUF_LENGTH(buf) - 5;
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while (buf && length > 0)
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{
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int clen = length > len ? len : length;
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memcpy(dptr, ptr, clen);
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dptr += clen;
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length -= clen;
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buf = buf->next;
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if (buf)
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{
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ptr = GWBUF_DATA(buf);
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len = GWBUF_LENGTH(buf);
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}
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}
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*dptr = 0;
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}
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}
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return rval;
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}
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/**
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* Copy query string from GWBUF buffer to separate memory area.
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*
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* @param buf GWBUF buffer including the query
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*
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* @return Plain text query if the packet type is COM_QUERY. Otherwise return
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* a string including the packet type.
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*/
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char *
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modutil_get_query(GWBUF *buf)
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{
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uint8_t* packet;
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mxs_mysql_cmd_t packet_type;
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size_t len;
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char* query_str = NULL;
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packet = GWBUF_DATA(buf);
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packet_type = (mxs_mysql_cmd_t)packet[4];
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switch (packet_type)
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{
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case MXS_COM_QUIT:
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len = strlen("[Quit msg]") + 1;
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if ((query_str = (char *)MXS_MALLOC(len + 1)) == NULL)
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{
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goto retblock;
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}
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memcpy(query_str, "[Quit msg]", len);
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memset(&query_str[len], 0, 1);
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break;
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case MXS_COM_QUERY:
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len = MYSQL_GET_PAYLOAD_LEN(packet) - 1; /*< distract 1 for packet type byte */
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if (len < 1 || len > ~(size_t)0 - 1 || (query_str = (char *)MXS_MALLOC(len + 1)) == NULL)
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{
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if (len >= 1 && len <= ~(size_t)0 - 1)
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{
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ss_dassert(!query_str);
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}
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goto retblock;
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}
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memcpy(query_str, &packet[5], len);
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memset(&query_str[len], 0, 1);
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break;
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default:
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len = strlen(STRPACKETTYPE(packet_type)) + 1;
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if (len < 1 || len > ~(size_t)0 - 1 || (query_str = (char *)MXS_MALLOC(len + 1)) == NULL)
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{
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if (len >= 1 && len <= ~(size_t)0 - 1)
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{
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ss_dassert(!query_str);
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}
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goto retblock;
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}
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memcpy(query_str, STRPACKETTYPE(packet_type), len);
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memset(&query_str[len], 0, 1);
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break;
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} /*< switch */
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retblock:
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return query_str;
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}
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|
|
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/**
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* create a GWBUFF with a MySQL ERR packet
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*
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* @param packet_number MySQL protocol sequence number in the packet
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* @param in_affected_rows MySQL affected rows
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* @param mysql_errno The MySQL errno
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* @param sqlstate_msg The MySQL State Message
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* @param mysql_message The Error Message
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* @return The allocated GWBUF or NULL on failure
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*/
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GWBUF *modutil_create_mysql_err_msg(int packet_number,
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int affected_rows,
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int merrno,
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const char *statemsg,
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const char *msg)
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{
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uint8_t *outbuf = NULL;
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uint32_t mysql_payload_size = 0;
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uint8_t mysql_packet_header[4];
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uint8_t *mysql_payload = NULL;
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uint8_t field_count = 0;
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uint8_t mysql_err[2];
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uint8_t mysql_statemsg[6];
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unsigned int mysql_errno = 0;
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const char *mysql_error_msg = NULL;
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const char *mysql_state = NULL;
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GWBUF *errbuf = NULL;
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if (statemsg == NULL || msg == NULL)
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{
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return NULL;
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}
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mysql_errno = (unsigned int)merrno;
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mysql_error_msg = msg;
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mysql_state = statemsg;
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field_count = 0xff;
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gw_mysql_set_byte2(mysql_err, mysql_errno);
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mysql_statemsg[0] = '#';
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memcpy(mysql_statemsg + 1, mysql_state, 5);
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|
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mysql_payload_size = sizeof(field_count) +
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sizeof(mysql_err) +
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sizeof(mysql_statemsg) +
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strlen(mysql_error_msg);
|
|
|
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/* allocate memory for packet header + payload */
|
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errbuf = gwbuf_alloc(sizeof(mysql_packet_header) + mysql_payload_size);
|
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ss_dassert(errbuf != NULL);
|
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|
|
if (errbuf == NULL)
|
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{
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return NULL;
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}
|
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outbuf = GWBUF_DATA(errbuf);
|
|
|
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/** write packet header and packet number */
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gw_mysql_set_byte3(mysql_packet_header, mysql_payload_size);
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mysql_packet_header[3] = packet_number;
|
|
|
|
/** write header */
|
|
memcpy(outbuf, mysql_packet_header, sizeof(mysql_packet_header));
|
|
|
|
mysql_payload = outbuf + sizeof(mysql_packet_header);
|
|
|
|
/** write field */
|
|
memcpy(mysql_payload, &field_count, sizeof(field_count));
|
|
mysql_payload = mysql_payload + sizeof(field_count);
|
|
|
|
/** write errno */
|
|
memcpy(mysql_payload, mysql_err, sizeof(mysql_err));
|
|
mysql_payload = mysql_payload + sizeof(mysql_err);
|
|
|
|
/** write sqlstate */
|
|
memcpy(mysql_payload, mysql_statemsg, sizeof(mysql_statemsg));
|
|
mysql_payload = mysql_payload + sizeof(mysql_statemsg);
|
|
|
|
/** write error message */
|
|
memcpy(mysql_payload, mysql_error_msg, strlen(mysql_error_msg));
|
|
|
|
return errbuf;
|
|
}
|
|
|
|
/**
|
|
* modutil_send_mysql_err_packet
|
|
*
|
|
* Send a MySQL protocol Generic ERR message, to the dcb
|
|
*
|
|
* @param dcb The DCB to send the packet
|
|
* @param packet_number MySQL protocol sequence number in the packet
|
|
* @param in_affected_rows MySQL affected rows
|
|
* @param mysql_errno The MySQL errno
|
|
* @param sqlstate_msg The MySQL State Message
|
|
* @param mysql_message The Error Message
|
|
* @return 0 for successful dcb write or 1 on failure
|
|
*
|
|
*/
|
|
int modutil_send_mysql_err_packet(DCB *dcb,
|
|
int packet_number,
|
|
int in_affected_rows,
|
|
int mysql_errno,
|
|
const char *sqlstate_msg,
|
|
const char *mysql_message)
|
|
{
|
|
GWBUF* buf;
|
|
|
|
buf = modutil_create_mysql_err_msg(packet_number, in_affected_rows, mysql_errno,
|
|
sqlstate_msg, mysql_message);
|
|
|
|
return dcb->func.write(dcb, buf);
|
|
}
|
|
|
|
/**
|
|
* Return the first packet from a buffer.
|
|
*
|
|
* @param p_readbuf Pointer to pointer to GWBUF. If the GWBUF contains a
|
|
* complete packet, after the call it will have been updated
|
|
* to begin at the byte following the packet.
|
|
*
|
|
* @return Pointer to GWBUF if the buffer contained at least one complete packet,
|
|
* otherwise NULL.
|
|
*
|
|
* @attention The returned GWBUF is not necessarily contiguous.
|
|
*/
|
|
GWBUF* modutil_get_next_MySQL_packet(GWBUF** p_readbuf)
|
|
{
|
|
GWBUF *packet = NULL;
|
|
GWBUF *readbuf = *p_readbuf;
|
|
|
|
if (readbuf)
|
|
{
|
|
CHK_GWBUF(readbuf);
|
|
|
|
size_t totalbuflen = gwbuf_length(readbuf);
|
|
if (totalbuflen >= MYSQL_HEADER_LEN)
|
|
{
|
|
size_t packetlen;
|
|
|
|
if (GWBUF_LENGTH(readbuf) >= 3) // The length is in the 3 first bytes.
|
|
{
|
|
uint8_t *data = (uint8_t *)GWBUF_DATA((readbuf));
|
|
packetlen = MYSQL_GET_PAYLOAD_LEN(data) + 4;
|
|
}
|
|
else
|
|
{
|
|
// The header is split between two GWBUFs.
|
|
uint8_t data[3];
|
|
gwbuf_copy_data(readbuf, 0, 3, data);
|
|
packetlen = MYSQL_GET_PAYLOAD_LEN(data) + 4;
|
|
}
|
|
|
|
if (packetlen <= totalbuflen)
|
|
{
|
|
packet = gwbuf_split(p_readbuf, packetlen);
|
|
}
|
|
}
|
|
}
|
|
|
|
return packet;
|
|
}
|
|
|
|
/**
|
|
* @brief Calculate the length of the complete MySQL packets in the buffer
|
|
*
|
|
* @param buffer Buffer to inspect
|
|
* @return Length of the complete MySQL packets in bytes
|
|
*/
|
|
static size_t get_complete_packets_length(GWBUF *buffer)
|
|
{
|
|
uint8_t packet_len[3];
|
|
uint32_t buflen = GWBUF_LENGTH(buffer);
|
|
size_t offset = 0;
|
|
size_t total = 0;
|
|
|
|
while (buffer && gwbuf_copy_data(buffer, offset, 3, packet_len) == 3)
|
|
{
|
|
uint32_t len = gw_mysql_get_byte3(packet_len) + MYSQL_HEADER_LEN;
|
|
|
|
if (len < buflen)
|
|
{
|
|
offset += len;
|
|
total += len;
|
|
buflen -= len;
|
|
}
|
|
/** The packet is spread across multiple buffers or a buffer ends with
|
|
* a complete packet. */
|
|
else
|
|
{
|
|
uint32_t read_len = len;
|
|
|
|
while (read_len >= buflen && buffer)
|
|
{
|
|
read_len -= buflen;
|
|
buffer = buffer->next;
|
|
buflen = buffer ? GWBUF_LENGTH(buffer) : 0;
|
|
}
|
|
|
|
/** Either the buffer ended with a complete packet or the buffer
|
|
* contains more data than is required. */
|
|
if (read_len == 0 || (buffer && read_len < buflen))
|
|
{
|
|
total += len;
|
|
offset = read_len;
|
|
buflen -= read_len;
|
|
}
|
|
/** The buffer chain contains at least one incomplete packet */
|
|
else
|
|
{
|
|
ss_dassert(!buffer);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
/**
|
|
* @brief Split the buffer into complete and partial packets
|
|
*
|
|
* @param p_readbuf Buffer to split, set to NULL if no partial packets are left
|
|
* @return Head of the chain of complete packets or NULL if no complete packets
|
|
* are available
|
|
*/
|
|
GWBUF* modutil_get_complete_packets(GWBUF **p_readbuf)
|
|
{
|
|
size_t buflen;
|
|
/** At least 3 bytes are needed to calculate the packet length. */
|
|
if (p_readbuf == NULL || (*p_readbuf) == NULL || (buflen = gwbuf_length(*p_readbuf)) < 3)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
size_t total = get_complete_packets_length(*p_readbuf);
|
|
GWBUF* complete = NULL;
|
|
|
|
if (buflen == total)
|
|
{
|
|
complete = *p_readbuf;
|
|
*p_readbuf = NULL;
|
|
}
|
|
else if (total > 0)
|
|
{
|
|
#ifdef SS_DEBUG
|
|
size_t before = gwbuf_length(*p_readbuf);
|
|
#endif
|
|
complete = gwbuf_split(p_readbuf, total);
|
|
#ifdef SS_DEBUG
|
|
ss_dassert(gwbuf_length(complete) == total);
|
|
ss_dassert(*p_readbuf == NULL || before - total == gwbuf_length(*p_readbuf));
|
|
#endif
|
|
}
|
|
return complete;
|
|
}
|
|
|
|
int modutil_count_signal_packets(GWBUF *reply, int n_found, bool* more_out, modutil_state* state)
|
|
{
|
|
enum
|
|
{
|
|
SKIP_NEXT = 0x1,
|
|
PS_OUT_PARAM = 0x2,
|
|
};
|
|
|
|
unsigned int len = gwbuf_length(reply);
|
|
int eof = 0;
|
|
int err = 0;
|
|
size_t offset = 0;
|
|
bool more = false;
|
|
bool only_ok = true;
|
|
uint64_t num_packets = 0;
|
|
uint8_t internal_state = state ? state->state : 0;
|
|
|
|
while (offset < len)
|
|
{
|
|
num_packets++;
|
|
uint8_t header[MYSQL_HEADER_LEN + 5]; // Maximum size of an EOF packet
|
|
|
|
gwbuf_copy_data(reply, offset, MYSQL_HEADER_LEN + 1, header);
|
|
|
|
unsigned int payloadlen = MYSQL_GET_PAYLOAD_LEN(header);
|
|
unsigned int pktlen = payloadlen + MYSQL_HEADER_LEN;
|
|
|
|
if (payloadlen == GW_MYSQL_MAX_PACKET_LEN)
|
|
{
|
|
only_ok = false;
|
|
internal_state |= SKIP_NEXT;
|
|
}
|
|
else if (internal_state & SKIP_NEXT)
|
|
{
|
|
only_ok = false;
|
|
internal_state &= ~SKIP_NEXT;
|
|
}
|
|
else
|
|
{
|
|
uint8_t command = MYSQL_GET_COMMAND(header);
|
|
|
|
if (command == MYSQL_REPLY_ERR)
|
|
{
|
|
/** Any errors in the packet stream mean that the result set
|
|
* generation was aborted due to an error. No more results will
|
|
* follow after this. */
|
|
*more_out = false;
|
|
return 2;
|
|
}
|
|
else if (command == MYSQL_REPLY_EOF && pktlen == MYSQL_EOF_PACKET_LEN)
|
|
{
|
|
eof++;
|
|
only_ok = false;
|
|
|
|
uint8_t status[2]; // Two byte server status
|
|
gwbuf_copy_data(reply, offset + MYSQL_HEADER_LEN + 1 + 2, sizeof(status), status);
|
|
more = gw_mysql_get_byte2(status) & SERVER_MORE_RESULTS_EXIST;
|
|
|
|
/**
|
|
* MySQL 5.6 and 5.7 have a "feature" that doesn't set
|
|
* the SERVER_MORE_RESULTS_EXIST flag in the last EOF packet of
|
|
* a result set if the SERVER_PS_OUT_PARAMS flag was set in
|
|
* the first result set. To handle this, we have to store
|
|
* the information from the first EOF packet until we process
|
|
* the second EOF packet.
|
|
*/
|
|
if (gw_mysql_get_byte2(status) & SERVER_PS_OUT_PARAMS)
|
|
{
|
|
internal_state |= PS_OUT_PARAM;
|
|
}
|
|
else if (internal_state & PS_OUT_PARAM)
|
|
{
|
|
more = true;
|
|
internal_state &= ~PS_OUT_PARAM;
|
|
}
|
|
}
|
|
else if (command == MYSQL_REPLY_OK && pktlen >= MYSQL_OK_PACKET_MIN_LEN &&
|
|
(eof + n_found) % 2 == 0)
|
|
{
|
|
// An OK packet that is not in the middle of a resultset stream
|
|
uint8_t data[payloadlen - 1];
|
|
gwbuf_copy_data(reply, offset + MYSQL_HEADER_LEN + 1, sizeof(data), data);
|
|
|
|
uint8_t* ptr = data;
|
|
ptr += mxs_leint_bytes(ptr);
|
|
ptr += mxs_leint_bytes(ptr);
|
|
|
|
uint16_t* status = (uint16_t*)ptr;
|
|
more = (*status) & SERVER_MORE_RESULTS_EXIST;
|
|
}
|
|
else
|
|
{
|
|
only_ok = false;
|
|
}
|
|
}
|
|
|
|
offset += pktlen;
|
|
|
|
if (offset >= GWBUF_LENGTH(reply) && reply->next)
|
|
{
|
|
len -= GWBUF_LENGTH(reply);
|
|
offset -= GWBUF_LENGTH(reply);
|
|
reply = reply->next;
|
|
}
|
|
}
|
|
|
|
int total = err + eof + n_found;
|
|
|
|
if (state)
|
|
{
|
|
state->state = internal_state;
|
|
}
|
|
|
|
*more_out = more;
|
|
|
|
// Treat complete multi-statement result sets that consist of only OK packets as a single result set
|
|
// TODO: Review this, it doesn't look very convincing.
|
|
if (only_ok && !more && num_packets > 1)
|
|
{
|
|
total = 2;
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
/**
|
|
* Create parse error and EPOLLIN event to event queue of the backend DCB.
|
|
* When event is notified the error message is processed as error reply and routed
|
|
* upstream to client.
|
|
*
|
|
* @param backend_dcb DCB where event is added
|
|
* @param errstr Plain-text string error
|
|
* @param flags GWBUF type flags
|
|
*/
|
|
void modutil_reply_parse_error(DCB* backend_dcb,
|
|
char* errstr,
|
|
uint32_t flags)
|
|
{
|
|
CHK_DCB(backend_dcb);
|
|
modutil_reply_routing_error(backend_dcb, 1064, "42000", errstr, flags);
|
|
}
|
|
|
|
/**
|
|
* Create authentication error and EPOLLIN event to event queue of the backend DCB.
|
|
* When event is notified the error message is processed as error reply and routed
|
|
* upstream to client.
|
|
*
|
|
* @param backend_dcb DCB where event is added
|
|
* @param errstr Plain-text string error
|
|
* @param flags GWBUF type flags
|
|
*/
|
|
void modutil_reply_auth_error(DCB* backend_dcb,
|
|
char* errstr,
|
|
uint32_t flags)
|
|
{
|
|
CHK_DCB(backend_dcb);
|
|
modutil_reply_routing_error(backend_dcb, 1045, "28000", errstr, flags);
|
|
}
|
|
|
|
|
|
/**
|
|
* Create error message and EPOLLIN event to event queue of the backend DCB.
|
|
* When event is notified the message is processed as error reply and routed
|
|
* upstream to client.
|
|
*
|
|
* @param backend_dcb DCB where event is added
|
|
* @param error SQL error number
|
|
* @param state SQL state
|
|
* @param errstr Plain-text string error
|
|
* @param flags GWBUF type flags
|
|
*/
|
|
static void modutil_reply_routing_error(DCB* backend_dcb,
|
|
int error,
|
|
const char* state,
|
|
char* errstr,
|
|
uint32_t flags)
|
|
{
|
|
GWBUF* buf;
|
|
CHK_DCB(backend_dcb);
|
|
|
|
buf = modutil_create_mysql_err_msg(1, 0, error, state, errstr);
|
|
MXS_FREE(errstr);
|
|
|
|
if (buf == NULL)
|
|
{
|
|
MXS_ERROR("Creating routing error message failed.");
|
|
return;
|
|
}
|
|
/** Set flags that help router to process reply correctly */
|
|
gwbuf_set_type(buf, flags);
|
|
/** Create an incoming event for backend DCB */
|
|
poll_add_epollin_event_to_dcb(backend_dcb, buf);
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Find the first occurrence of a character in a string. This function ignores
|
|
* escaped characters and all characters that are enclosed in single or double quotes.
|
|
* @param ptr Pointer to area of memory to inspect
|
|
* @param c Character to search for
|
|
* @param len Size of the memory area
|
|
* @return Pointer to the first non-escaped, non-quoted occurrence of the character.
|
|
* If the character is not found, NULL is returned.
|
|
*/
|
|
char* strnchr_esc(char* ptr, char c, int len)
|
|
{
|
|
char* p = (char*)ptr;
|
|
char* start = p;
|
|
bool quoted = false, escaped = false;
|
|
char qc = 0;
|
|
|
|
while (p < start + len)
|
|
{
|
|
if (escaped)
|
|
{
|
|
escaped = false;
|
|
}
|
|
else if (*p == '\\')
|
|
{
|
|
escaped = true;
|
|
}
|
|
else if ((*p == '\'' || *p == '"') && !quoted)
|
|
{
|
|
quoted = true;
|
|
qc = *p;
|
|
}
|
|
else if (quoted && *p == qc)
|
|
{
|
|
quoted = false;
|
|
}
|
|
else if (*p == c && !escaped && !quoted)
|
|
{
|
|
return p;
|
|
}
|
|
p++;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* Find the first occurrence of a character in a string. This function ignores
|
|
* escaped characters and all characters that are enclosed in single or double quotes.
|
|
* MySQL style comment blocks and identifiers in backticks are also ignored.
|
|
* @param ptr Pointer to area of memory to inspect
|
|
* @param c Character to search for
|
|
* @param len Size of the memory area
|
|
* @return Pointer to the first non-escaped, non-quoted occurrence of the character.
|
|
* If the character is not found, NULL is returned.
|
|
*/
|
|
char* strnchr_esc_mysql(char* ptr, char c, int len)
|
|
{
|
|
char* p = (char*) ptr;
|
|
char* start = p, *end = start + len;
|
|
bool quoted = false, escaped = false, backtick = false, comment = false;
|
|
char qc = 0;
|
|
|
|
while (p < end)
|
|
{
|
|
if (escaped)
|
|
{
|
|
escaped = false;
|
|
}
|
|
else if ((!comment && !quoted && !backtick) || (comment && *p == '*') ||
|
|
(!comment && quoted && *p == qc) || (!comment && backtick && *p == '`'))
|
|
{
|
|
switch (*p)
|
|
{
|
|
case '\\':
|
|
escaped = true;
|
|
break;
|
|
|
|
case '\'':
|
|
case '"':
|
|
if (!quoted)
|
|
{
|
|
quoted = true;
|
|
qc = *p;
|
|
}
|
|
else if (*p == qc)
|
|
{
|
|
quoted = false;
|
|
}
|
|
break;
|
|
|
|
case '/':
|
|
if (p + 1 < end && *(p + 1) == '*')
|
|
{
|
|
comment = true;
|
|
p += 1;
|
|
}
|
|
break;
|
|
|
|
case '*':
|
|
if (comment && p + 1 < end && *(p + 1) == '/')
|
|
{
|
|
comment = false;
|
|
p += 1;
|
|
}
|
|
break;
|
|
|
|
case '`':
|
|
backtick = !backtick;
|
|
break;
|
|
|
|
case '#':
|
|
return NULL;
|
|
|
|
case '-':
|
|
if (p + 2 < end && *(p + 1) == '-' &&
|
|
isspace(*(p + 2)))
|
|
{
|
|
return NULL;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (*p == c && !escaped && !quoted && !comment && !backtick)
|
|
{
|
|
return p;
|
|
}
|
|
}
|
|
p++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if the string is the final part of a valid SQL statement
|
|
*
|
|
* This function checks whether the string pointed by @p start contains any
|
|
* tokens that are interpreted as executable commands.
|
|
* @param start String containing the statement
|
|
* @param len Length of the string
|
|
* @return True if statement contains no executable parts
|
|
*/
|
|
bool is_mysql_statement_end(const char* start, int len)
|
|
{
|
|
const char *ptr = start;
|
|
bool rval = false;
|
|
|
|
while (ptr < start + len && (isspace(*ptr) || *ptr == ';'))
|
|
{
|
|
ptr++;
|
|
}
|
|
|
|
if (ptr < start + len)
|
|
{
|
|
switch (*ptr)
|
|
{
|
|
case '-':
|
|
if (ptr < start + len - 2 && *(ptr + 1) == '-' && isspace(*(ptr + 2)))
|
|
{
|
|
rval = true;
|
|
}
|
|
break;
|
|
|
|
case '#':
|
|
rval = true;
|
|
break;
|
|
|
|
case '/':
|
|
if (ptr < start + len - 1 && *(ptr + 1) == '*')
|
|
{
|
|
rval = true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
rval = true;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if the token is the END part of a BEGIN ... END block.
|
|
* @param ptr String with at least three non-whitespace characters in it
|
|
* @return True if the token is the final part of a BEGIN .. END block
|
|
*/
|
|
bool is_mysql_sp_end(const char* start, int len)
|
|
{
|
|
const char *ptr = start;
|
|
|
|
while (ptr < start + len && (isspace(*ptr) || *ptr == ';'))
|
|
{
|
|
ptr++;
|
|
}
|
|
|
|
return ptr < start + len - 3 && strncasecmp(ptr, "end", 3) == 0;
|
|
}
|
|
|
|
/**
|
|
* Create a COM_QUERY packet from a string.
|
|
* @param query Query to create.
|
|
* @return Pointer to GWBUF with the query or NULL if memory allocation failed
|
|
*/
|
|
GWBUF* modutil_create_query(const char* query)
|
|
{
|
|
ss_dassert(query);
|
|
size_t len = strlen(query) + 1; // Query plus the command byte
|
|
GWBUF* rval = gwbuf_alloc(len + MYSQL_HEADER_LEN);
|
|
|
|
if (rval)
|
|
{
|
|
uint8_t *ptr = (uint8_t*)rval->start;
|
|
*ptr++ = (len);
|
|
*ptr++ = (len) >> 8;
|
|
*ptr++ = (len) >> 16;
|
|
*ptr++ = 0x0;
|
|
*ptr++ = 0x03;
|
|
memcpy(ptr, query, strlen(query));
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Count the number of statements in a query.
|
|
* @param buffer Buffer to analyze.
|
|
* @return Number of statements.
|
|
*/
|
|
int modutil_count_statements(GWBUF* buffer)
|
|
{
|
|
char* start = ((char*)(buffer)->start + 5);
|
|
char* ptr = start;
|
|
char* end = ((char*)(buffer)->end);
|
|
int num = 1;
|
|
|
|
while (ptr < end && (ptr = strnchr_esc(ptr, ';', end - ptr)))
|
|
{
|
|
num++;
|
|
while (ptr < end && *ptr == ';')
|
|
{
|
|
ptr++;
|
|
}
|
|
}
|
|
|
|
ptr = end - 1;
|
|
|
|
if (ptr >= start && ptr < end)
|
|
{
|
|
while (ptr > start && isspace(*ptr))
|
|
{
|
|
ptr--;
|
|
}
|
|
|
|
if (*ptr == ';')
|
|
{
|
|
num--;
|
|
}
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
int modutil_count_packets(GWBUF* buffer)
|
|
{
|
|
int packets = 0;
|
|
size_t offset = 0;
|
|
uint8_t len[3];
|
|
|
|
while (gwbuf_copy_data(buffer, offset, 3, len) == 3)
|
|
{
|
|
++packets;
|
|
offset += gw_mysql_get_byte3(len) + MYSQL_HEADER_LEN;
|
|
}
|
|
|
|
return packets;
|
|
}
|
|
|
|
/**
|
|
* Initialize the PCRE2 patterns used when converting MySQL wildcards to PCRE syntax.
|
|
*/
|
|
void prepare_pcre2_patterns()
|
|
{
|
|
spinlock_acquire(&re_lock);
|
|
if (!pattern_init)
|
|
{
|
|
int err;
|
|
size_t erroff;
|
|
PCRE2_UCHAR errbuf[MXS_STRERROR_BUFLEN];
|
|
|
|
if ((re_percent = pcre2_compile(pattern_percent, PCRE2_ZERO_TERMINATED,
|
|
0, &err, &erroff, NULL)) &&
|
|
(re_single = pcre2_compile(pattern_single, PCRE2_ZERO_TERMINATED,
|
|
0, &err, &erroff, NULL)) &&
|
|
(re_escape = pcre2_compile(pattern_escape, PCRE2_ZERO_TERMINATED,
|
|
0, &err, &erroff, NULL)))
|
|
{
|
|
assert(!pattern_init);
|
|
pattern_init = true;
|
|
}
|
|
else
|
|
{
|
|
pcre2_get_error_message(err, errbuf, sizeof(errbuf));
|
|
MXS_ERROR("Failed to compile PCRE2 pattern: %s", errbuf);
|
|
}
|
|
|
|
if (!pattern_init)
|
|
{
|
|
pcre2_code_free(re_percent);
|
|
pcre2_code_free(re_single);
|
|
pcre2_code_free(re_escape);
|
|
re_percent = NULL;
|
|
re_single = NULL;
|
|
re_escape = NULL;
|
|
}
|
|
}
|
|
spinlock_release(&re_lock);
|
|
}
|
|
|
|
/**
|
|
* Check if @c string matches @c pattern according to the MySQL wildcard rules.
|
|
* The wildcard character @c '%%' is replaced with @c '.*' and @c '_' is replaced
|
|
* with @c '.'. All Regular expression special characters are escaped before
|
|
* matching is made.
|
|
* @param pattern Wildcard pattern
|
|
* @param string String to match
|
|
* @return MXS_PCRE2_MATCH if the pattern matches, MXS_PCRE2_NOMATCH if it does
|
|
* not match and MXS_PCRE2_ERROR if an error occurred
|
|
* @see maxscale/pcre2.h
|
|
*/
|
|
mxs_pcre2_result_t modutil_mysql_wildcard_match(const char* pattern, const char* string)
|
|
{
|
|
prepare_pcre2_patterns();
|
|
mxs_pcre2_result_t rval = MXS_PCRE2_ERROR;
|
|
bool err = false;
|
|
PCRE2_SIZE matchsize = strlen(string) + 1;
|
|
PCRE2_SIZE tempsize = matchsize;
|
|
char* matchstr = (char*) MXS_MALLOC(matchsize);
|
|
char* tempstr = (char*) MXS_MALLOC(tempsize);
|
|
|
|
if (matchstr && tempstr)
|
|
{
|
|
pcre2_match_data *mdata_percent = pcre2_match_data_create_from_pattern(re_percent, NULL);
|
|
pcre2_match_data *mdata_single = pcre2_match_data_create_from_pattern(re_single, NULL);
|
|
pcre2_match_data *mdata_escape = pcre2_match_data_create_from_pattern(re_escape, NULL);
|
|
|
|
if (mdata_percent && mdata_single && mdata_escape)
|
|
{
|
|
if (mxs_pcre2_substitute(re_escape, pattern, sub_escape,
|
|
&matchstr, &matchsize) == MXS_PCRE2_ERROR ||
|
|
mxs_pcre2_substitute(re_single, matchstr, sub_single,
|
|
&tempstr, &tempsize) == MXS_PCRE2_ERROR ||
|
|
mxs_pcre2_substitute(re_percent, tempstr, sub_percent,
|
|
&matchstr, &matchsize) == MXS_PCRE2_ERROR)
|
|
{
|
|
err = true;
|
|
}
|
|
|
|
if (!err)
|
|
{
|
|
int errcode;
|
|
rval = mxs_pcre2_simple_match(matchstr, string, PCRE2_CASELESS, &errcode);
|
|
if (rval == MXS_PCRE2_ERROR)
|
|
{
|
|
if (errcode != 0)
|
|
{
|
|
PCRE2_UCHAR errbuf[MXS_STRERROR_BUFLEN];
|
|
pcre2_get_error_message(errcode, errbuf, sizeof(errbuf));
|
|
MXS_ERROR("Failed to match pattern: %s", errbuf);
|
|
}
|
|
err = true;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
err = true;
|
|
}
|
|
|
|
if (err)
|
|
{
|
|
MXS_ERROR("Fatal error when matching wildcard patterns.");
|
|
}
|
|
|
|
pcre2_match_data_free(mdata_percent);
|
|
pcre2_match_data_free(mdata_single);
|
|
pcre2_match_data_free(mdata_escape);
|
|
}
|
|
|
|
MXS_FREE(matchstr);
|
|
MXS_FREE(tempstr);
|
|
|
|
return rval;
|
|
}
|
|
|
|
/*
|
|
* Replace user-provided literals with question marks.
|
|
*
|
|
* TODO: Make the canonicalization allocate only one buffer of memory
|
|
*
|
|
* @param querybuf GWBUF with a COM_QUERY statement
|
|
* @return A copy of the query in its canonical form or NULL if an error occurred.
|
|
*/
|
|
char* modutil_get_canonical(GWBUF* querybuf)
|
|
{
|
|
char *querystr = NULL;
|
|
|
|
if (GWBUF_LENGTH(querybuf) > MYSQL_HEADER_LEN + 1 && GWBUF_IS_SQL(querybuf))
|
|
{
|
|
size_t srcsize = GWBUF_LENGTH(querybuf) - MYSQL_HEADER_LEN - 1;
|
|
char *src = (char*)GWBUF_DATA(querybuf) + MYSQL_HEADER_LEN + 1;
|
|
size_t destsize = 0;
|
|
char *dest = NULL;
|
|
|
|
if (replace_quoted((const char**)&src, &srcsize, &dest, &destsize))
|
|
{
|
|
/** Reset the buffers so that the old result is reused and a new
|
|
* result is created.*/
|
|
src = dest;
|
|
srcsize = destsize;
|
|
dest = NULL;
|
|
destsize = 0;
|
|
|
|
if (remove_mysql_comments((const char**)&src, &srcsize, &dest, &destsize))
|
|
{
|
|
/** Both buffers now contain allocated memory so all we need
|
|
* to do is to swap them */
|
|
if (replace_values((const char**)&dest, &destsize, &src, &srcsize))
|
|
{
|
|
querystr = squeeze_whitespace(src);
|
|
MXS_FREE(dest);
|
|
}
|
|
else
|
|
{
|
|
MXS_FREE(src);
|
|
MXS_FREE(dest);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_FREE(src);
|
|
}
|
|
}
|
|
}
|
|
|
|
return querystr;
|
|
}
|
|
|
|
|
|
char* modutil_MySQL_bypass_whitespace(char* sql, size_t len)
|
|
{
|
|
char *i = sql;
|
|
char *end = i + len;
|
|
|
|
while (i != end)
|
|
{
|
|
if (isspace(*i))
|
|
{
|
|
++i;
|
|
}
|
|
else if (*i == '/') // Might be a comment
|
|
{
|
|
if ((i + 1 != end) && (*(i + 1) == '*')) // Indeed it was
|
|
{
|
|
i += 2;
|
|
|
|
while (i != end)
|
|
{
|
|
if (*i == '*') // Might be the end of the comment
|
|
{
|
|
++i;
|
|
|
|
if (i != end)
|
|
{
|
|
if (*i == '/') // Indeed it was
|
|
{
|
|
++i;
|
|
break; // Out of this inner while.
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// It was not the end of the comment.
|
|
++i;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Was not a comment, so we'll bail out.
|
|
break;
|
|
}
|
|
}
|
|
else if (*i == '-') // Might be the start of a comment to the end of line
|
|
{
|
|
bool is_comment = false;
|
|
|
|
if (i + 1 != end)
|
|
{
|
|
if (*(i + 1) == '-') // Might be, yes.
|
|
{
|
|
if (i + 2 != end)
|
|
{
|
|
if (isspace(*(i + 2))) // Yes, it is.
|
|
{
|
|
is_comment = true;
|
|
|
|
i += 3;
|
|
|
|
while ((i != end) && (*i != '\n'))
|
|
{
|
|
++i;
|
|
}
|
|
|
|
if (i != end)
|
|
{
|
|
ss_dassert(*i == '\n');
|
|
++i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!is_comment)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
else if (*i == '#')
|
|
{
|
|
++i;
|
|
|
|
while ((i != end) && (*i != '\n'))
|
|
{
|
|
++i;
|
|
}
|
|
|
|
if (i != end)
|
|
{
|
|
ss_dassert(*i == '\n');
|
|
++i;
|
|
}
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
// Neither whitespace not start of a comment, so we bail out.
|
|
break;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
bool modutil_ignorable_ping(DCB *dcb)
|
|
{
|
|
static uint8_t com_ping_packet[] =
|
|
{
|
|
0x01, 0x00, 0x00, 0x00, 0x0e
|
|
};
|
|
|
|
GWBUF *buf = gwbuf_alloc_and_load(sizeof(com_ping_packet), com_ping_packet);
|
|
bool rval = false;
|
|
|
|
if (buf)
|
|
{
|
|
gwbuf_set_type(buf, GWBUF_TYPE_IGNORABLE);
|
|
|
|
if (dcb->func.write(dcb, buf))
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
const char format_str[] = "COM_UNKNOWN(%02hhx)";
|
|
|
|
// The message always fits inside the buffer
|
|
thread_local char unknow_type[sizeof(format_str)] = "";
|
|
|
|
const char* STRPACKETTYPE(int p)
|
|
{
|
|
switch (p)
|
|
{
|
|
case MXS_COM_SLEEP:
|
|
return "COM_SLEEP";
|
|
case MXS_COM_QUIT:
|
|
return "COM_QUIT";
|
|
case MXS_COM_INIT_DB:
|
|
return "COM_INIT_DB";
|
|
case MXS_COM_QUERY:
|
|
return "COM_QUERY";
|
|
case MXS_COM_FIELD_LIST:
|
|
return "COM_FIELD_LIST";
|
|
case MXS_COM_CREATE_DB:
|
|
return "COM_CREATE_DB";
|
|
case MXS_COM_DROP_DB:
|
|
return "COM_DROP_DB";
|
|
case MXS_COM_REFRESH:
|
|
return "COM_REFRESH";
|
|
case MXS_COM_SHUTDOWN:
|
|
return "COM_SHUTDOWN";
|
|
case MXS_COM_STATISTICS:
|
|
return "COM_STATISTICS";
|
|
case MXS_COM_PROCESS_INFO:
|
|
return "COM_PROCESS_INFO";
|
|
case MXS_COM_CONNECT:
|
|
return "COM_CONNECT";
|
|
case MXS_COM_PROCESS_KILL:
|
|
return "COM_PROCESS_KILL";
|
|
case MXS_COM_DEBUG:
|
|
return "COM_DEBUG";
|
|
case MXS_COM_PING:
|
|
return "COM_PING";
|
|
case MXS_COM_TIME:
|
|
return "COM_TIME";
|
|
case MXS_COM_DELAYED_INSERT:
|
|
return "COM_DELAYED_INSERT";
|
|
case MXS_COM_CHANGE_USER:
|
|
return "COM_CHANGE_USER";
|
|
case MXS_COM_BINLOG_DUMP:
|
|
return "COM_BINLOG_DUMP";
|
|
case MXS_COM_TABLE_DUMP:
|
|
return "COM_TABLE_DUMP";
|
|
case MXS_COM_CONNECT_OUT:
|
|
return "COM_CONNECT_OUT";
|
|
case MXS_COM_REGISTER_SLAVE:
|
|
return "COM_REGISTER_SLAVE";
|
|
case MXS_COM_STMT_PREPARE:
|
|
return "COM_STMT_PREPARE";
|
|
case MXS_COM_STMT_EXECUTE:
|
|
return "COM_STMT_EXECUTE";
|
|
case MXS_COM_STMT_SEND_LONG_DATA:
|
|
return "COM_STMT_SEND_LONG_DATA";
|
|
case MXS_COM_STMT_CLOSE:
|
|
return "COM_STMT_CLOSE";
|
|
case MXS_COM_STMT_RESET:
|
|
return "COM_STMT_RESET";
|
|
case MXS_COM_SET_OPTION:
|
|
return "COM_SET_OPTION";
|
|
case MXS_COM_STMT_FETCH:
|
|
return "COM_STMT_FETCH";
|
|
case MXS_COM_DAEMON:
|
|
return "COM_DAEMON";
|
|
}
|
|
|
|
snprintf(unknow_type, sizeof(unknow_type), format_str, p);
|
|
|
|
return unknow_type;
|
|
}
|