13f7015e7b
The EOF packet calculation function in modutil.cc didn't handle the case where the payload exceeded maximum packet size and could mistake binary data for a ERR packet. The state of a multi-packet payload is now exposed by the modutil_count_signal_packets function. This allows proper handling of large multi-packet payloads. Added minor improvements to mxs1110_16mb to handle testing of this change.
116 lines
4.7 KiB
C
116 lines
4.7 KiB
C
#pragma once
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/*
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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.h A set of useful routines for module writers
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*/
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#include <maxscale/cdefs.h>
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#include <maxscale/buffer.h>
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#include <maxscale/dcb.h>
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#include <string.h>
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#include <maxscale/pcre2.h>
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MXS_BEGIN_DECLS
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#define PTR_IS_RESULTSET(b) (b[0] == 0x01 && b[1] == 0x0 && b[2] == 0x0 && b[3] == 0x01)
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#define PTR_IS_EOF(b) (b[0] == 0x05 && b[1] == 0x0 && b[2] == 0x0 && b[4] == 0xfe)
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#define PTR_IS_OK(b) (b[4] == 0x00)
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#define PTR_IS_ERR(b) (b[4] == 0xff)
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#define PTR_IS_LOCAL_INFILE(b) (b[4] == 0xfb)
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#define IS_FULL_RESPONSE(buf) (modutil_count_signal_packets(buf,0,0) == 2)
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extern int modutil_is_SQL(GWBUF *);
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extern int modutil_is_SQL_prepare(GWBUF *);
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extern int modutil_extract_SQL(GWBUF *, char **, int *);
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extern int modutil_MySQL_Query(GWBUF *, char **, int *, int *);
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extern char* modutil_get_SQL(GWBUF *);
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extern GWBUF* modutil_replace_SQL(GWBUF *, char *);
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extern char* modutil_get_query(GWBUF* buf);
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extern int modutil_send_mysql_err_packet(DCB *, int, int, int, const char *, const char *);
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GWBUF* modutil_get_next_MySQL_packet(GWBUF** p_readbuf);
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GWBUF* modutil_get_complete_packets(GWBUF** p_readbuf);
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int modutil_MySQL_query_len(GWBUF* buf, int* nbytes_missing);
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void modutil_reply_parse_error(DCB* backend_dcb, char* errstr, uint32_t flags);
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void modutil_reply_auth_error(DCB* backend_dcb, char* errstr, uint32_t flags);
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int modutil_count_statements(GWBUF* buffer);
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GWBUF* modutil_create_query(const char* query);
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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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* @brief Count the number of EOF and ERR packets in the buffer.
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*
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* Only complete packets are inspected and the buffer is assumed to only contain
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* whole packets. If partial packets are in the buffer, they are ignored.
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* The caller must handle the detection of partial packets in buffers.
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*
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* On the first invocation, the value pointed by @c skip should be set to false.
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* On all subsequent calls, for partial result sets, the function uses it to
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* store the internal state. When the value pointed by @c skip is set to true,
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* the next call must be done with only unprocessed packets in @c reply.
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*
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* @param reply Buffer to use
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* @param n_found Number of previous found packets
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* @param more Set to true of more results exist
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* @param skip Internal state of the function used for handling large payloads.
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*
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* @return Total number of EOF and ERR packets including the ones already found
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*/
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int modutil_count_signal_packets(GWBUF *reply, int n_found, bool* more, bool* skip);
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mxs_pcre2_result_t modutil_mysql_wildcard_match(const char* pattern, const char* string);
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/**
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* Given a buffer containing a MySQL statement, this function will return
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* a pointer to the first character that is not whitespace. In this context,
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* comments are also counted as whitespace. For instance:
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*
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* "SELECT" => "SELECT"
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* " SELECT => "SELECT"
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* " / * A comment * / SELECT" => "SELECT"
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* "-- comment\nSELECT" => "SELECT"
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*
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* @param sql Pointer to buffer containing a MySQL statement
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* @param len Length of sql.
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*
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* @return The first non whitespace (including comments) character. If the
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* entire buffer is only whitespace, the returned pointer will point
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* to the character following the buffer (i.e. sql + len).
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*/
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char* modutil_MySQL_bypass_whitespace(char* sql, size_t len);
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/**
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* @brief Write a COM_PING to a DCB and ignore the response
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*
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* @param dcb The backend DCB where the COM_PING is written
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* @return True if command was successfully sent
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*/
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bool modutil_ignorable_ping(DCB *dcb);
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/** Character and token searching functions */
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char* strnchr_esc(char* ptr, char c, int len);
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char* strnchr_esc_mysql(char* ptr, char c, int len);
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bool is_mysql_statement_end(const char* start, int len);
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bool is_mysql_sp_end(const char* start, int len);
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char* modutil_get_canonical(GWBUF* querybuf);
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// TODO: Move modutil out of the core
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const char* STRPACKETTYPE(int p);
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MXS_END_DECLS
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