1 /* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
6
7 This program is also distributed with certain software (including
8 but not limited to OpenSSL) that is licensed under separate terms,
9 as designated in a particular file or component or in included license
10 documentation. The authors of MySQL hereby grant you an additional
11 permission to link the program and your derivative works with the
12 separately licensed software that they have included with MySQL.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License, version 2.0, for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
22
23 /* Execute CALL statement */
24
25 #include "sql/sql_call.h"
26
27 #include <limits.h>
28 #include <stddef.h>
29 #include <sys/types.h>
30 #include <algorithm>
31 #include <atomic>
32
33 #include "lex_string.h"
34 #include "my_base.h"
35 #include "my_dbug.h"
36 #include "my_inttypes.h"
37 #include "my_sys.h"
38 #include "mysql/plugin_audit.h"
39 #include "mysql_com.h"
40 #include "mysqld_error.h"
41 #include "sql/auth/auth_acls.h"
42 #include "sql/auth/auth_common.h" // check_routine_access, check_table_access
43 #include "sql/item.h" // class Item
44 #include "sql/protocol.h"
45 #include "sql/sp.h" // sp_find_routine
46 #include "sql/sp_head.h"
47 #include "sql/sp_pcontext.h" // class sp_variable
48 #include "sql/sql_audit.h" // AUDIT_EVENT
49 #include "sql/sql_class.h" // class THD
50 #include "sql/sql_lex.h"
51 #include "sql/sql_list.h"
52 #include "sql/system_variables.h"
53 #include "template_utils.h"
54
55 using std::max;
56
precheck(THD * thd)57 bool Sql_cmd_call::precheck(THD *thd) {
58 // Check execute privilege on stored procedure
59 if (check_routine_access(thd, EXECUTE_ACL, proc_name->m_db.str,
60 proc_name->m_name.str, true, false))
61 return true;
62
63 // Check SELECT privileges for any subqueries
64 if (check_table_access(thd, SELECT_ACL, lex->query_tables, false, UINT_MAX,
65 false))
66 return true;
67 return false;
68 }
69
prepare_inner(THD * thd)70 bool Sql_cmd_call::prepare_inner(THD *thd) {
71 // All required SPs should be in cache so no need to look into DB.
72
73 sp_head *sp = sp_find_routine(thd, enum_sp_type::PROCEDURE, proc_name,
74 &thd->sp_proc_cache, true);
75 if (sp == nullptr) {
76 my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE", proc_name->m_qname.str);
77 return true;
78 }
79
80 sp_pcontext *root_parsing_context = sp->get_root_parsing_context();
81
82 uint arg_count = proc_args != nullptr ? proc_args->elements : 0;
83
84 if (root_parsing_context->context_var_count() != arg_count) {
85 my_error(ER_SP_WRONG_NO_OF_ARGS, MYF(0), "PROCEDURE",
86 proc_name->m_qname.str, root_parsing_context->context_var_count(),
87 arg_count);
88 return true;
89 }
90
91 if (proc_args == nullptr) return false;
92
93 List_iterator<Item> it(*proc_args);
94 Item *item;
95 int arg_no = 0;
96 while ((item = it++)) {
97 if (item->type() == Item::TRIGGER_FIELD_ITEM) {
98 Item_trigger_field *itf = down_cast<Item_trigger_field *>(item);
99 sp_variable *spvar = root_parsing_context->find_variable(arg_no);
100 if (spvar->mode != sp_variable::MODE_IN)
101 itf->set_required_privilege(spvar->mode == sp_variable::MODE_INOUT);
102 }
103 if ((!item->fixed && item->fix_fields(thd, it.ref())) ||
104 item->check_cols(1))
105 return true; /* purecov: inspected */
106 arg_no++;
107 }
108
109 return false;
110 }
111
execute_inner(THD * thd)112 bool Sql_cmd_call::execute_inner(THD *thd) {
113 // All required SPs should be in cache so no need to look into DB.
114
115 sp_head *sp = sp_setup_routine(thd, enum_sp_type::PROCEDURE, proc_name,
116 &thd->sp_proc_cache);
117 if (sp == nullptr) {
118 my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE", proc_name->m_qname.str);
119 return true;
120 }
121
122 // bits to be cleared in thd->server_status
123 uint bits_to_be_cleared = 0;
124 /*
125 Check that the stored procedure doesn't contain Dynamic SQL and doesn't
126 return result sets: such stored procedures can't be called from
127 a function or trigger.
128 */
129 if (thd->in_sub_stmt) {
130 const char *where =
131 (thd->in_sub_stmt & SUB_STMT_TRIGGER ? "trigger" : "function");
132 if (sp->is_not_allowed_in_function(where)) return true;
133 }
134
135 if (mysql_audit_notify(thd, AUDIT_EVENT(MYSQL_AUDIT_STORED_PROGRAM_EXECUTE),
136 proc_name->m_db.str, proc_name->m_name.str, nullptr))
137 return true;
138
139 if (sp->m_flags & sp_head::MULTI_RESULTS) {
140 if (!thd->get_protocol()->has_client_capability(CLIENT_MULTI_RESULTS)) {
141 // Client does not support multiple result sets
142 my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
143 return true;
144 }
145 /*
146 If SERVER_MORE_RESULTS_EXISTS is not set,
147 then remember that it should be cleared
148 */
149 bits_to_be_cleared = (~thd->server_status & SERVER_MORE_RESULTS_EXISTS);
150 thd->server_status |= SERVER_MORE_RESULTS_EXISTS;
151 }
152
153 ha_rows select_limit = thd->variables.select_limit;
154 thd->variables.select_limit = HA_POS_ERROR;
155
156 /*
157 Never write CALL statements into binlog:
158 - If the mode is non-prelocked, each statement will be logged separately.
159 - If the mode is prelocked, the invoking statement will care about writing
160 into binlog.
161 So just execute the statement.
162 */
163 bool result = sp->execute_procedure(thd, proc_args);
164
165 thd->variables.select_limit = select_limit;
166
167 thd->server_status &= ~bits_to_be_cleared;
168
169 if (result) {
170 DBUG_ASSERT(thd->is_error() || thd->killed);
171 return true; // Substatement should already have sent error
172 }
173
174 my_ok(thd, max(thd->get_row_count_func(), 0LL));
175
176 return false;
177 }
178