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Comment:Do not allow triggers on the SQLITE_MASTER table. (CVS 579)
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SHA1: 275ba356f351abcf9a079ac16b765c9443750f0e
User & Date: drh 2002-05-23 00:30:31
Context
2002-05-23
02:09
Fix some places where a malloc() failure would lead to a segfault. (CVS 580) check-in: 01ad352c user: drh tags: trunk
00:30
Do not allow triggers on the SQLITE_MASTER table. (CVS 579) check-in: 275ba356 user: drh tags: trunk
2002-05-22
21:27
Fix for ticket #46: Report an error if a CREATE TABLE contains two or more columns with the same name. (CVS 578) check-in: ba1953ab user: drh tags: trunk
Changes
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Changes to src/parse.y. 

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**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.66 2002/05/21 11:38:12 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  sqliteSetString(&pParse->zErrMsg,"syntax error",0);
................................................................................
id(A) ::= INSTEAD(X).    {A = X;}
id(A) ::= KEY(X).        {A = X;}
id(A) ::= OF(X).         {A = X;}
id(A) ::= OFFSET(X).     {A = X;}
id(A) ::= PRAGMA(X).     {A = X;}
id(A) ::= REPLACE(X).    {A = X;}
id(A) ::= ROW(X).        {A = X;}

id(A) ::= TEMP(X).       {A = X;}
id(A) ::= TRIGGER(X).    {A = X;}
id(A) ::= VACUUM(X).     {A = X;}
id(A) ::= VIEW(X).       {A = X;}

// And "ids" is an identifer-or-string.
//








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**
*************************************************************************
** This file contains SQLite's grammar for SQL.  Process this file
** using the lemon parser generator to generate C code that runs
** the parser.  Lemon will also generate a header file containing
** numeric codes for all of the tokens.
**
** @(#) $Id: parse.y,v 1.67 2002/05/23 00:30:31 drh Exp $
*/
%token_prefix TK_
%token_type {Token}
%default_type {Token}
%extra_argument {Parse *pParse}
%syntax_error {
  sqliteSetString(&pParse->zErrMsg,"syntax error",0);
................................................................................
id(A) ::= INSTEAD(X).    {A = X;}
id(A) ::= KEY(X).        {A = X;}
id(A) ::= OF(X).         {A = X;}
id(A) ::= OFFSET(X).     {A = X;}
id(A) ::= PRAGMA(X).     {A = X;}
id(A) ::= REPLACE(X).    {A = X;}
id(A) ::= ROW(X).        {A = X;}
id(A) ::= STATEMENT(X).  {A = X;}
id(A) ::= TEMP(X).       {A = X;}
id(A) ::= TRIGGER(X).    {A = X;}
id(A) ::= VACUUM(X).     {A = X;}
id(A) ::= VIEW(X).       {A = X;}

// And "ids" is an identifer-or-string.
//

Changes to src/tokenize.c. 

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*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
**
** $Id: tokenize.c,v 1.41 2002/05/15 08:30:14 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include <stdlib.h>

/*
................................................................................
  { "PRAGMA",            0, TK_PRAGMA,           0 },
  { "PRIMARY",           0, TK_PRIMARY,          0 },
  { "REPLACE",           0, TK_REPLACE,          0 },
  { "ROLLBACK",          0, TK_ROLLBACK,         0 },
  { "ROW",               0, TK_ROW,              0 },
  { "SELECT",            0, TK_SELECT,           0 },
  { "SET",               0, TK_SET,              0 },

  { "TABLE",             0, TK_TABLE,            0 },
  { "TEMP",              0, TK_TEMP,             0 },
  { "TEMPORARY",         0, TK_TEMP,             0 },
  { "THEN",              0, TK_THEN,             0 },
  { "TRANSACTION",       0, TK_TRANSACTION,      0 },
  { "TRIGGER",           0, TK_TRIGGER,          0 },
  { "UNION",             0, TK_UNION,            0 },








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*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
**
** $Id: tokenize.c,v 1.42 2002/05/23 00:30:31 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include <stdlib.h>

/*
................................................................................
  { "PRAGMA",            0, TK_PRAGMA,           0 },
  { "PRIMARY",           0, TK_PRIMARY,          0 },
  { "REPLACE",           0, TK_REPLACE,          0 },
  { "ROLLBACK",          0, TK_ROLLBACK,         0 },
  { "ROW",               0, TK_ROW,              0 },
  { "SELECT",            0, TK_SELECT,           0 },
  { "SET",               0, TK_SET,              0 },
  { "STATEMENT",         0, TK_STATEMENT,        0 },
  { "TABLE",             0, TK_TABLE,            0 },
  { "TEMP",              0, TK_TEMP,             0 },
  { "TEMPORARY",         0, TK_TEMP,             0 },
  { "THEN",              0, TK_THEN,             0 },
  { "TRANSACTION",       0, TK_TRANSACTION,      0 },
  { "TRIGGER",           0, TK_TRIGGER,          0 },
  { "UNION",             0, TK_UNION,            0 },

Changes to src/trigger.c. 

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    tab = sqliteFindTable(pParse->db, tmp_str);
    sqliteFree(tmp_str);
    if( !tab ){
      sqliteSetNString(&pParse->zErrMsg, "no such table: ", -1,
          pTableName->z, pTableName->n, 0);
      pParse->nErr++;
      goto trigger_cleanup;






    }
  }

  /* Build the Trigger object */
  nt = (Trigger*)sqliteMalloc(sizeof(Trigger));
  nt->name = sqliteStrNDup(pName->z, pName->n);
  nt->table = sqliteStrNDup(pTableName->z, pTableName->n);








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    tab = sqliteFindTable(pParse->db, tmp_str);
    sqliteFree(tmp_str);
    if( !tab ){
      sqliteSetNString(&pParse->zErrMsg, "no such table: ", -1,
          pTableName->z, pTableName->n, 0);
      pParse->nErr++;
      goto trigger_cleanup;
    }
    if( sqliteStrICmp(tab->zName, MASTER_NAME)==0 ){
      sqliteSetString(&pParse->zErrMsg, "cannot create trigger on system "
         "table: " MASTER_NAME, 0);
      pParse->nErr++;
      goto trigger_cleanup;
    }
  }

  /* Build the Trigger object */
  nt = (Trigger*)sqliteMalloc(sizeof(Trigger));
  nt->name = sqliteStrNDup(pName->z, pName->n);
  nt->table = sqliteStrNDup(pTableName->z, pTableName->n);

Changes to test/trigger1.test. 

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	CREATE TRIGGER temp_trig UPDATE ON temp_table BEGIN
	    SELECT * from sqlite_master;
	END;
	SELECT count(*) FROM sqlite_master WHERE name = 'temp_trig';
  } 
} {0}









catchsql {
  DROP TABLE temp_table;
}
catchsql {
  DROP TABLE t1;
}

finish_test









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	CREATE TRIGGER temp_trig UPDATE ON temp_table BEGIN
	    SELECT * from sqlite_master;
	END;
	SELECT count(*) FROM sqlite_master WHERE name = 'temp_trig';
  } 
} {0}

do_test trig_cd-1.9 {
  catchsql {
    CREATE TRIGGER tr1 AFTER UPDATE ON sqlite_master BEGIN
       SELECT * FROM sqlite_master;
    END;
  }
} {1 {cannot create trigger on system table: sqlite_master}}

catchsql {
  DROP TABLE temp_table;
}
catchsql {
  DROP TABLE t1;
}

finish_test

Changes to test/trigger2.test. 

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  }
} {4 2 3 6 3 4}
execsql {
  DROP TABLE tbl;
}

# 7. Triggers on views

execsql {
  CREATE TABLE ab(a, b);
  CREATE TABLE cd(c, d);
  INSERT INTO ab VALUES (1, 2);
  INSERT INTO ab VALUES (0, 0);
  INSERT INTO cd VALUES (3, 4);

................................................................................
	0, 0, 0, 0, new.a, new.b, new.c, new.d);
  END;
   CREATE TRIGGER after_insert AFTER INSERT ON abcd BEGIN
    INSERT INTO tlog VALUES(NULL, 
	0, 0, 0, 0, new.a, new.b, new.c, new.d);
   END;
}


do_test trig-7 {
  execsql {
    UPDATE abcd SET a = 100, b = 5*5 WHERE a = 1;
    DELETE FROM abcd WHERE a = 1;
    INSERT INTO abcd VALUES(10, 20, 30, 40);
    SELECT * FROM tlog;
  }
} [ list 1 1 2 3 4 100 25 3 4 \
         2 1 2 3 4 100 25 3 4 \
 3 1 2 3 4 0 0 0 0 4 1 2 3 4 0 0 0 0 \
 5 0 0 0 0 10 20 30 40 6 0 0 0 0 10 20 30 40 ]

finish_test









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  }
} {4 2 3 6 3 4}
execsql {
  DROP TABLE tbl;
}

# 7. Triggers on views
do_test trig-7.1 {
  execsql {
  CREATE TABLE ab(a, b);
  CREATE TABLE cd(c, d);
  INSERT INTO ab VALUES (1, 2);
  INSERT INTO ab VALUES (0, 0);
  INSERT INTO cd VALUES (3, 4);

................................................................................
	0, 0, 0, 0, new.a, new.b, new.c, new.d);
  END;
   CREATE TRIGGER after_insert AFTER INSERT ON abcd BEGIN
    INSERT INTO tlog VALUES(NULL, 
	0, 0, 0, 0, new.a, new.b, new.c, new.d);
   END;
  }
} {}

do_test trig-7.2 {
  execsql {
    UPDATE abcd SET a = 100, b = 5*5 WHERE a = 1;
    DELETE FROM abcd WHERE a = 1;
    INSERT INTO abcd VALUES(10, 20, 30, 40);
    SELECT * FROM tlog;
  }
} [ list 1 1 2 3 4 100 25 3 4 \
         2 1 2 3 4 100 25 3 4 \
 3 1 2 3 4 0 0 0 0 4 1 2 3 4 0 0 0 0 \
 5 0 0 0 0 10 20 30 40 6 0 0 0 0 10 20 30 40 ]

finish_test

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