1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/* Copyright (c) 2015, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql/sql_query_rewrite.h"
#include <assert.h>
#include <stddef.h>
#include "lex_string.h"
#include "my_sqlcommand.h"
#include "mysql/plugin_audit.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/service_rules_table.h"
#include "mysql/service_ssl_wrapper.h"
#include "mysqld_error.h"
#include "sql/sql_audit.h"
#include "sql/sql_class.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_parse.h"
static void raise_query_rewritten_note(THD *thd, const char *original_query,
const char *rewritten_query) {
Sql_condition::enum_severity_level sl = Sql_condition::SL_NOTE;
const char *message =
"Query '%s' rewritten to '%s' by a query rewrite plugin";
push_warning_printf(thd, sl, ER_UNKNOWN_ERROR, message, original_query,
rewritten_query);
}
void invoke_pre_parse_rewrite_plugins(THD *thd) {
Diagnostics_area *plugin_da = thd->get_query_rewrite_plugin_da();
if (plugin_da == nullptr) return;
plugin_da->reset_diagnostics_area();
plugin_da->reset_condition_info(thd);
Diagnostics_area *da = thd->get_parser_da();
thd->push_diagnostics_area(plugin_da, false);
mysql_event_parse_rewrite_plugin_flag flags =
MYSQL_AUDIT_PARSE_REWRITE_PLUGIN_NONE;
LEX_CSTRING rewritten_query = {nullptr, 0};
mysql_audit_notify(thd, AUDIT_EVENT(MYSQL_AUDIT_PARSE_PREPARSE), &flags,
&rewritten_query);
/* Do not continue when the plugin set the error state. */
if (!plugin_da->is_error() &&
flags & MYSQL_AUDIT_PARSE_REWRITE_PLUGIN_QUERY_REWRITTEN) {
// It is a rewrite fulltext plugin and we need a rewrite we must have
// generated a new query then.
assert(rewritten_query.str != nullptr && rewritten_query.length > 0);
raise_query_rewritten_note(thd, thd->query().str, rewritten_query.str);
alloc_query(thd, rewritten_query.str, rewritten_query.length);
thd->m_parser_state->init(thd, thd->query().str, thd->query().length);
my_free(const_cast<char *>(rewritten_query.str));
}
da->copy_non_errors_from_da(thd, plugin_da);
thd->pop_diagnostics_area();
if (plugin_da->is_error()) {
thd->get_stmt_da()->set_error_status(plugin_da->mysql_errno(),
plugin_da->message_text(),
plugin_da->returned_sqlstate());
plugin_da->reset_diagnostics_area();
}
}
bool invoke_post_parse_rewrite_plugins(THD *thd, bool is_prepared) {
Diagnostics_area *plugin_da = thd->get_query_rewrite_plugin_da();
plugin_da->reset_diagnostics_area();
plugin_da->reset_condition_info(thd);
Diagnostics_area *stmt_da = thd->get_stmt_da();
/*
We save the value of keep_diagnostics here as it gets reset by
push_diagnostics_area(), see below for use.
*/
bool keeping_diagnostics = thd->lex->keep_diagnostics == DA_KEEP_PARSE_ERROR;
thd->push_diagnostics_area(plugin_da, false);
{
/*
We have to call a function in rules_table_service.cc, or the service
won't be visible to plugins.
*/
#ifndef NDEBUG
int dummy =
#endif
rules_table_service::
dummy_function_to_ensure_we_are_linked_into_the_server();
assert(dummy == 1);
#ifndef NDEBUG
dummy =
#endif
ssl_wrapper_service::
dummy_function_to_ensure_we_are_linked_into_the_server();
assert(dummy == 1);
}
mysql_event_parse_rewrite_plugin_flag flags =
is_prepared ? MYSQL_AUDIT_PARSE_REWRITE_PLUGIN_IS_PREPARED_STATEMENT
: MYSQL_AUDIT_PARSE_REWRITE_PLUGIN_NONE;
bool err = false;
const char *original_query = thd->query().str;
mysql_audit_notify(thd, AUDIT_EVENT(MYSQL_AUDIT_PARSE_POSTPARSE), &flags,
nullptr);
if (flags & MYSQL_AUDIT_PARSE_REWRITE_PLUGIN_QUERY_REWRITTEN) {
raise_query_rewritten_note(thd, original_query, thd->query().str);
thd->lex->safe_to_cache_query = false;
}
if (plugin_da->current_statement_cond_count() != 0) {
/*
A plugin raised at least one condition. At this point these are in the
plugin DA, and we should copy them to the statement DA. But before we do
that, we may have to clear it as this DA may contain conditions from the
previous statement. We have to clear it *unless* the statement is a
diagnostics statement, in which case we keep everything: conditions from
previous statements, parser conditions and plugin conditions. If this is
not a diagnostics statement, parse_sql() has already cleared the
statement DA, copied the parser conditions to the statement DA and set
DA_KEEP_PARSE_ERROR. So we arrive at the below condition for telling us
when to clear the statement DA.
*/
if (thd->lex->sql_command != SQLCOM_SHOW_WARNS && !keeping_diagnostics)
stmt_da->reset_condition_info(thd);
/* We need to put any errors in the DA as well as the condition list. */
if (plugin_da->is_error())
stmt_da->set_error_status(plugin_da->mysql_errno(),
plugin_da->message_text(),
plugin_da->returned_sqlstate());
stmt_da->copy_sql_conditions_from_da(thd, plugin_da);
/*
Do not clear the condition list when starting execution as it now
contains not the results of the previous executions, but a non-zero
number of errors/warnings thrown during parsing or plugin execution.
*/
thd->lex->keep_diagnostics = DA_KEEP_PARSE_ERROR;
}
thd->pop_diagnostics_area();
return err;
}
|
