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36510232aa
when calling a SP from C API" The bug was caused by lack of checks for misuse in mysql_real_query. A stored procedure always returns at least one result, which is the status of execution of the procedure itself. This result, or so-called OK packet, is similar to a result returned by INSERT/UPDATE/CREATE operations: it contains the overall status of execution, the number of affected rows and the number of warnings. The client test program attached to the bug did not read this result and ivnoked the next query. In turn, libmysql had no check for such scenario and mysql_real_query was simply trying to send that query without reading the pending response, thus messing up the communication protocol. The fix is to return an error from mysql_real_query when it's called prior to retrieval of all pending results. client/mysqlbinlog.cc: net_safe_read -> cli_safe_read include/mysql.h: Remove a private function from the public header. include/mysql_com.h: Remove a define that is never used. include/sql_common.h: Add a declaration for cli_safe_read - a function that reads one packet from the server. libmysql/libmysql.c: net_safe_read -> cli_safe_read Return CR_COMMANDS_OUT_OF_SYNC on attempt to execute a statement using a connection which has pending result sets. sql-common/client.c: Actual fix for Bug#15752: if the server has pending result sets for the client, return CR_COMMANDS_OUT_OF_SYNC on attempt to execute another query. Similarly to the behaviour of mysql_use_result(), multiple result sets block the connection and must be fetched before it can be used for another query. This uncovered an error in the protocol: the server doesn't drop SERVER_MORE_RESULTS_EXISTS status flag upon an error, so in case of a multi-query like SELECT 1; SELECT syntax_error; SELECT 2; the client has no way to know that the server won't ever come to execution of the third query and won't return any result sets for it. For now, fix it in cli_safe_read, as a proper fix requires extension of the client-server protocol. sql/protocol.cc: Remove a name that is never used. sql/slave.cc: net_safe_read -> cli_safe_read tests/mysql_client_test.c: Make 'query' a local variable to avoid name clash. Add a test case for Bug#15752 "Lost connection to MySQL server when calling an SP from C API"
451 lines
17 KiB
C
451 lines
17 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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** Common definition between mysql server & client
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*/
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#ifndef _mysql_com_h
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#define _mysql_com_h
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#define NAME_LEN 64 /* Field/table name length */
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#define HOSTNAME_LENGTH 60
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#define USERNAME_LENGTH 16
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#define SERVER_VERSION_LENGTH 60
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#define SQLSTATE_LENGTH 5
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/*
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USER_HOST_BUFF_SIZE -- length of string buffer, that is enough to contain
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username and hostname parts of the user identifier with trailing zero in
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MySQL standard format:
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user_name_part@host_name_part\0
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*/
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#define USER_HOST_BUFF_SIZE HOSTNAME_LENGTH + USERNAME_LENGTH + 2
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#define LOCAL_HOST "localhost"
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#define LOCAL_HOST_NAMEDPIPE "."
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#if defined(__WIN__) && !defined( _CUSTOMCONFIG_)
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#define MYSQL_NAMEDPIPE "MySQL"
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#define MYSQL_SERVICENAME "MySQL"
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#endif /* __WIN__ */
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/*
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You should add new commands to the end of this list, otherwise old
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servers won't be able to handle them as 'unsupported'.
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*/
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enum enum_server_command
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{
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COM_SLEEP, COM_QUIT, COM_INIT_DB, COM_QUERY, COM_FIELD_LIST,
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COM_CREATE_DB, COM_DROP_DB, COM_REFRESH, COM_SHUTDOWN, COM_STATISTICS,
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COM_PROCESS_INFO, COM_CONNECT, COM_PROCESS_KILL, COM_DEBUG, COM_PING,
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COM_TIME, COM_DELAYED_INSERT, COM_CHANGE_USER, COM_BINLOG_DUMP,
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COM_TABLE_DUMP, COM_CONNECT_OUT, COM_REGISTER_SLAVE,
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COM_STMT_PREPARE, COM_STMT_EXECUTE, COM_STMT_SEND_LONG_DATA, COM_STMT_CLOSE,
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COM_STMT_RESET, COM_SET_OPTION, COM_STMT_FETCH,
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/* don't forget to update const char *command_name[] in sql_parse.cc */
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/* Must be last */
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COM_END
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};
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/*
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Length of random string sent by server on handshake; this is also length of
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obfuscated password, recieved from client
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*/
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#define SCRAMBLE_LENGTH 20
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#define SCRAMBLE_LENGTH_323 8
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/* length of password stored in the db: new passwords are preceeded with '*' */
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#define SCRAMBLED_PASSWORD_CHAR_LENGTH (SCRAMBLE_LENGTH*2+1)
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#define SCRAMBLED_PASSWORD_CHAR_LENGTH_323 (SCRAMBLE_LENGTH_323*2)
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#define NOT_NULL_FLAG 1 /* Field can't be NULL */
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#define PRI_KEY_FLAG 2 /* Field is part of a primary key */
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#define UNIQUE_KEY_FLAG 4 /* Field is part of a unique key */
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#define MULTIPLE_KEY_FLAG 8 /* Field is part of a key */
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#define BLOB_FLAG 16 /* Field is a blob */
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#define UNSIGNED_FLAG 32 /* Field is unsigned */
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#define ZEROFILL_FLAG 64 /* Field is zerofill */
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#define BINARY_FLAG 128 /* Field is binary */
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/* The following are only sent to new clients */
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#define ENUM_FLAG 256 /* field is an enum */
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#define AUTO_INCREMENT_FLAG 512 /* field is a autoincrement field */
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#define TIMESTAMP_FLAG 1024 /* Field is a timestamp */
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#define SET_FLAG 2048 /* field is a set */
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#define NO_DEFAULT_VALUE_FLAG 4096 /* Field doesn't have default value */
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#define NUM_FLAG 32768 /* Field is num (for clients) */
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#define PART_KEY_FLAG 16384 /* Intern; Part of some key */
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#define GROUP_FLAG 32768 /* Intern: Group field */
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#define UNIQUE_FLAG 65536 /* Intern: Used by sql_yacc */
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#define BINCMP_FLAG 131072 /* Intern: Used by sql_yacc */
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#define REFRESH_GRANT 1 /* Refresh grant tables */
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#define REFRESH_LOG 2 /* Start on new log file */
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#define REFRESH_TABLES 4 /* close all tables */
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#define REFRESH_HOSTS 8 /* Flush host cache */
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#define REFRESH_STATUS 16 /* Flush status variables */
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#define REFRESH_THREADS 32 /* Flush thread cache */
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#define REFRESH_SLAVE 64 /* Reset master info and restart slave
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thread */
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#define REFRESH_MASTER 128 /* Remove all bin logs in the index
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and truncate the index */
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/* The following can't be set with mysql_refresh() */
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#define REFRESH_READ_LOCK 16384 /* Lock tables for read */
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#define REFRESH_FAST 32768 /* Intern flag */
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/* RESET (remove all queries) from query cache */
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#define REFRESH_QUERY_CACHE 65536
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#define REFRESH_QUERY_CACHE_FREE 0x20000L /* pack query cache */
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#define REFRESH_DES_KEY_FILE 0x40000L
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#define REFRESH_USER_RESOURCES 0x80000L
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#define CLIENT_LONG_PASSWORD 1 /* new more secure passwords */
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#define CLIENT_FOUND_ROWS 2 /* Found instead of affected rows */
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#define CLIENT_LONG_FLAG 4 /* Get all column flags */
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#define CLIENT_CONNECT_WITH_DB 8 /* One can specify db on connect */
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#define CLIENT_NO_SCHEMA 16 /* Don't allow database.table.column */
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#define CLIENT_COMPRESS 32 /* Can use compression protocol */
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#define CLIENT_ODBC 64 /* Odbc client */
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#define CLIENT_LOCAL_FILES 128 /* Can use LOAD DATA LOCAL */
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#define CLIENT_IGNORE_SPACE 256 /* Ignore spaces before '(' */
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#define CLIENT_PROTOCOL_41 512 /* New 4.1 protocol */
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#define CLIENT_INTERACTIVE 1024 /* This is an interactive client */
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#define CLIENT_SSL 2048 /* Switch to SSL after handshake */
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#define CLIENT_IGNORE_SIGPIPE 4096 /* IGNORE sigpipes */
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#define CLIENT_TRANSACTIONS 8192 /* Client knows about transactions */
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#define CLIENT_RESERVED 16384 /* Old flag for 4.1 protocol */
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#define CLIENT_SECURE_CONNECTION 32768 /* New 4.1 authentication */
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#define CLIENT_MULTI_STATEMENTS 65536 /* Enable/disable multi-stmt support */
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#define CLIENT_MULTI_RESULTS 131072 /* Enable/disable multi-results */
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#define CLIENT_REMEMBER_OPTIONS (((ulong) 1) << 31)
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#define SERVER_STATUS_IN_TRANS 1 /* Transaction has started */
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#define SERVER_STATUS_AUTOCOMMIT 2 /* Server in auto_commit mode */
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#define SERVER_MORE_RESULTS_EXISTS 8 /* Multi query - next query exists */
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#define SERVER_QUERY_NO_GOOD_INDEX_USED 16
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#define SERVER_QUERY_NO_INDEX_USED 32
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/*
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The server was able to fulfill the clients request and opened a
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read-only non-scrollable cursor for a query. This flag comes
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in reply to COM_STMT_EXECUTE and COM_STMT_FETCH commands.
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*/
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#define SERVER_STATUS_CURSOR_EXISTS 64
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/*
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This flag is sent when a read-only cursor is exhausted, in reply to
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COM_STMT_FETCH command.
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*/
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#define SERVER_STATUS_LAST_ROW_SENT 128
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#define SERVER_STATUS_DB_DROPPED 256 /* A database was dropped */
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#define SERVER_STATUS_NO_BACKSLASH_ESCAPES 512
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#define MYSQL_ERRMSG_SIZE 512
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#define NET_READ_TIMEOUT 30 /* Timeout on read */
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#define NET_WRITE_TIMEOUT 60 /* Timeout on write */
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#define NET_WAIT_TIMEOUT 8*60*60 /* Wait for new query */
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#define ONLY_KILL_QUERY 1
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struct st_vio; /* Only C */
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typedef struct st_vio Vio;
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#define MAX_TINYINT_WIDTH 3 /* Max width for a TINY w.o. sign */
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#define MAX_SMALLINT_WIDTH 5 /* Max width for a SHORT w.o. sign */
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#define MAX_MEDIUMINT_WIDTH 8 /* Max width for a INT24 w.o. sign */
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#define MAX_INT_WIDTH 10 /* Max width for a LONG w.o. sign */
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#define MAX_BIGINT_WIDTH 20 /* Max width for a LONGLONG */
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#define MAX_CHAR_WIDTH 255 /* Max length for a CHAR colum */
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#define MAX_BLOB_WIDTH 8192 /* Default width for blob */
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typedef struct st_net {
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#if !defined(CHECK_EMBEDDED_DIFFERENCES) || !defined(EMBEDDED_LIBRARY)
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Vio* vio;
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unsigned char *buff,*buff_end,*write_pos,*read_pos;
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my_socket fd; /* For Perl DBI/dbd */
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unsigned long max_packet,max_packet_size;
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unsigned int pkt_nr,compress_pkt_nr;
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unsigned int write_timeout, read_timeout, retry_count;
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int fcntl;
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my_bool compress;
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/*
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The following variable is set if we are doing several queries in one
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command ( as in LOAD TABLE ... FROM MASTER ),
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and do not want to confuse the client with OK at the wrong time
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*/
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unsigned long remain_in_buf,length, buf_length, where_b;
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unsigned int *return_status;
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unsigned char reading_or_writing;
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char save_char;
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my_bool no_send_ok; /* For SPs and other things that do multiple stmts */
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my_bool no_send_eof; /* For SPs' first version read-only cursors */
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/*
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Set if OK packet is already sent, and we do not need to send error
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messages
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*/
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my_bool no_send_error;
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/*
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Pointer to query object in query cache, do not equal NULL (0) for
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queries in cache that have not stored its results yet
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*/
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#endif
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char last_error[MYSQL_ERRMSG_SIZE], sqlstate[SQLSTATE_LENGTH+1];
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unsigned int last_errno;
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unsigned char error;
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gptr query_cache_query;
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my_bool report_error; /* We should report error (we have unreported error) */
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my_bool return_errno;
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} NET;
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#define packet_error (~(unsigned long) 0)
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enum enum_field_types { MYSQL_TYPE_DECIMAL, MYSQL_TYPE_TINY,
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MYSQL_TYPE_SHORT, MYSQL_TYPE_LONG,
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MYSQL_TYPE_FLOAT, MYSQL_TYPE_DOUBLE,
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MYSQL_TYPE_NULL, MYSQL_TYPE_TIMESTAMP,
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MYSQL_TYPE_LONGLONG,MYSQL_TYPE_INT24,
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MYSQL_TYPE_DATE, MYSQL_TYPE_TIME,
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MYSQL_TYPE_DATETIME, MYSQL_TYPE_YEAR,
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MYSQL_TYPE_NEWDATE, MYSQL_TYPE_VARCHAR,
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MYSQL_TYPE_BIT,
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MYSQL_TYPE_NEWDECIMAL=246,
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MYSQL_TYPE_ENUM=247,
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MYSQL_TYPE_SET=248,
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MYSQL_TYPE_TINY_BLOB=249,
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MYSQL_TYPE_MEDIUM_BLOB=250,
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MYSQL_TYPE_LONG_BLOB=251,
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MYSQL_TYPE_BLOB=252,
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MYSQL_TYPE_VAR_STRING=253,
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MYSQL_TYPE_STRING=254,
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MYSQL_TYPE_GEOMETRY=255
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};
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/* For backward compatibility */
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#define CLIENT_MULTI_QUERIES CLIENT_MULTI_STATEMENTS
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#define FIELD_TYPE_DECIMAL MYSQL_TYPE_DECIMAL
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#define FIELD_TYPE_NEWDECIMAL MYSQL_TYPE_NEWDECIMAL
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#define FIELD_TYPE_TINY MYSQL_TYPE_TINY
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#define FIELD_TYPE_SHORT MYSQL_TYPE_SHORT
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#define FIELD_TYPE_LONG MYSQL_TYPE_LONG
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#define FIELD_TYPE_FLOAT MYSQL_TYPE_FLOAT
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#define FIELD_TYPE_DOUBLE MYSQL_TYPE_DOUBLE
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#define FIELD_TYPE_NULL MYSQL_TYPE_NULL
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#define FIELD_TYPE_TIMESTAMP MYSQL_TYPE_TIMESTAMP
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#define FIELD_TYPE_LONGLONG MYSQL_TYPE_LONGLONG
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#define FIELD_TYPE_INT24 MYSQL_TYPE_INT24
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#define FIELD_TYPE_DATE MYSQL_TYPE_DATE
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#define FIELD_TYPE_TIME MYSQL_TYPE_TIME
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#define FIELD_TYPE_DATETIME MYSQL_TYPE_DATETIME
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#define FIELD_TYPE_YEAR MYSQL_TYPE_YEAR
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#define FIELD_TYPE_NEWDATE MYSQL_TYPE_NEWDATE
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#define FIELD_TYPE_ENUM MYSQL_TYPE_ENUM
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#define FIELD_TYPE_SET MYSQL_TYPE_SET
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#define FIELD_TYPE_TINY_BLOB MYSQL_TYPE_TINY_BLOB
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#define FIELD_TYPE_MEDIUM_BLOB MYSQL_TYPE_MEDIUM_BLOB
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#define FIELD_TYPE_LONG_BLOB MYSQL_TYPE_LONG_BLOB
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#define FIELD_TYPE_BLOB MYSQL_TYPE_BLOB
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#define FIELD_TYPE_VAR_STRING MYSQL_TYPE_VAR_STRING
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#define FIELD_TYPE_STRING MYSQL_TYPE_STRING
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#define FIELD_TYPE_CHAR MYSQL_TYPE_TINY
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#define FIELD_TYPE_INTERVAL MYSQL_TYPE_ENUM
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#define FIELD_TYPE_GEOMETRY MYSQL_TYPE_GEOMETRY
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#define FIELD_TYPE_BIT MYSQL_TYPE_BIT
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/* Shutdown/kill enums and constants */
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/* Bits for THD::killable. */
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#define MYSQL_SHUTDOWN_KILLABLE_CONNECT (unsigned char)(1 << 0)
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#define MYSQL_SHUTDOWN_KILLABLE_TRANS (unsigned char)(1 << 1)
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#define MYSQL_SHUTDOWN_KILLABLE_LOCK_TABLE (unsigned char)(1 << 2)
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#define MYSQL_SHUTDOWN_KILLABLE_UPDATE (unsigned char)(1 << 3)
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enum mysql_enum_shutdown_level {
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/*
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We want levels to be in growing order of hardness (because we use number
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comparisons). Note that DEFAULT does not respect the growing property, but
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it's ok.
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*/
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SHUTDOWN_DEFAULT = 0,
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/* wait for existing connections to finish */
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SHUTDOWN_WAIT_CONNECTIONS= MYSQL_SHUTDOWN_KILLABLE_CONNECT,
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/* wait for existing trans to finish */
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SHUTDOWN_WAIT_TRANSACTIONS= MYSQL_SHUTDOWN_KILLABLE_TRANS,
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/* wait for existing updates to finish (=> no partial MyISAM update) */
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SHUTDOWN_WAIT_UPDATES= MYSQL_SHUTDOWN_KILLABLE_UPDATE,
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/* flush InnoDB buffers and other storage engines' buffers*/
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SHUTDOWN_WAIT_ALL_BUFFERS= (MYSQL_SHUTDOWN_KILLABLE_UPDATE << 1),
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/* don't flush InnoDB buffers, flush other storage engines' buffers*/
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SHUTDOWN_WAIT_CRITICAL_BUFFERS= (MYSQL_SHUTDOWN_KILLABLE_UPDATE << 1) + 1,
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/* Now the 2 levels of the KILL command */
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#if MYSQL_VERSION_ID >= 50000
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KILL_QUERY= 254,
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#endif
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KILL_CONNECTION= 255
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};
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enum enum_cursor_type
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{
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CURSOR_TYPE_NO_CURSOR= 0,
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CURSOR_TYPE_READ_ONLY= 1,
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CURSOR_TYPE_FOR_UPDATE= 2,
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CURSOR_TYPE_SCROLLABLE= 4
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};
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/* options for mysql_set_option */
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enum enum_mysql_set_option
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{
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MYSQL_OPTION_MULTI_STATEMENTS_ON,
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MYSQL_OPTION_MULTI_STATEMENTS_OFF
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};
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#define net_new_transaction(net) ((net)->pkt_nr=0)
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#ifdef __cplusplus
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extern "C" {
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#endif
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my_bool my_net_init(NET *net, Vio* vio);
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void my_net_local_init(NET *net);
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void net_end(NET *net);
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void net_clear(NET *net);
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my_bool net_realloc(NET *net, unsigned long length);
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my_bool net_flush(NET *net);
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my_bool my_net_write(NET *net,const char *packet,unsigned long len);
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my_bool net_write_command(NET *net,unsigned char command,
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const char *header, unsigned long head_len,
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const char *packet, unsigned long len);
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int net_real_write(NET *net,const char *packet,unsigned long len);
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unsigned long my_net_read(NET *net);
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/*
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The following function is not meant for normal usage
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Currently it's used internally by manager.c
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*/
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struct sockaddr;
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int my_connect(my_socket s, const struct sockaddr *name, unsigned int namelen,
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unsigned int timeout);
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struct rand_struct {
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unsigned long seed1,seed2,max_value;
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double max_value_dbl;
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};
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#ifdef __cplusplus
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}
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#endif
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/* The following is for user defined functions */
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enum Item_result {STRING_RESULT=0, REAL_RESULT, INT_RESULT, ROW_RESULT,
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DECIMAL_RESULT};
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typedef struct st_udf_args
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{
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unsigned int arg_count; /* Number of arguments */
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enum Item_result *arg_type; /* Pointer to item_results */
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char **args; /* Pointer to argument */
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unsigned long *lengths; /* Length of string arguments */
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char *maybe_null; /* Set to 1 for all maybe_null args */
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char **attributes; /* Pointer to attribute name */
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unsigned long *attribute_lengths; /* Length of attribute arguments */
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} UDF_ARGS;
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/* This holds information about the result */
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typedef struct st_udf_init
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{
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my_bool maybe_null; /* 1 if function can return NULL */
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unsigned int decimals; /* for real functions */
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unsigned long max_length; /* For string functions */
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char *ptr; /* free pointer for function data */
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my_bool const_item; /* 0 if result is independent of arguments */
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} UDF_INIT;
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/* Constants when using compression */
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#define NET_HEADER_SIZE 4 /* standard header size */
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#define COMP_HEADER_SIZE 3 /* compression header extra size */
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/* Prototypes to password functions */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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These functions are used for authentication by client and server and
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implemented in sql/password.c
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*/
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void randominit(struct rand_struct *, unsigned long seed1,
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unsigned long seed2);
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double my_rnd(struct rand_struct *);
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void create_random_string(char *to, unsigned int length, struct rand_struct *rand_st);
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void hash_password(unsigned long *to, const char *password, unsigned int password_len);
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void make_scrambled_password_323(char *to, const char *password);
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void scramble_323(char *to, const char *message, const char *password);
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my_bool check_scramble_323(const char *, const char *message,
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unsigned long *salt);
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void get_salt_from_password_323(unsigned long *res, const char *password);
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void make_password_from_salt_323(char *to, const unsigned long *salt);
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void make_scrambled_password(char *to, const char *password);
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void scramble(char *to, const char *message, const char *password);
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my_bool check_scramble(const char *reply, const char *message,
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const unsigned char *hash_stage2);
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void get_salt_from_password(unsigned char *res, const char *password);
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void make_password_from_salt(char *to, const unsigned char *hash_stage2);
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char *octet2hex(char *to, const char *str, unsigned int len);
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|
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/* end of password.c */
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|
|
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char *get_tty_password(char *opt_message);
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const char *mysql_errno_to_sqlstate(unsigned int mysql_errno);
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|
|
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/* Some other useful functions */
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|
|
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my_bool my_init(void);
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|
extern int modify_defaults_file(const char *file_location, const char *option,
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|
const char *option_value,
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|
const char *section_name, int remove_option);
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int load_defaults(const char *conf_file, const char **groups,
|
|
int *argc, char ***argv);
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|
my_bool my_thread_init(void);
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|
void my_thread_end(void);
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|
|
|
#ifdef _global_h
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ulong STDCALL net_field_length(uchar **packet);
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my_ulonglong net_field_length_ll(uchar **packet);
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|
char *net_store_length(char *pkg, ulonglong length);
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#endif
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|
|
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#ifdef __cplusplus
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}
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|
#endif
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|
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#define NULL_LENGTH ((unsigned long) ~0) /* For net_store_length */
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#define MYSQL_STMT_HEADER 4
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#define MYSQL_LONG_DATA_HEADER 6
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#endif
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