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MXS-1536: Fix ALTER TABLE parsing

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The ALTER TABLE parsing didn't properly handle escaped values and it used
the current database unconditionally.
This commit is contained in:
Markus Mäkelä
2017-11-29 13:16:40 +02:00
parent 764863cb3f
commit a32789d4ac
1 changed files with 32 additions and 13 deletions
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45
server/modules/routing/avrorouter/avro_schema.c
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@ -698,7 +698,7 @@ TABLE_CREATE* table_create_from_schema(const char* file, const char* db,
* @param db Database where this query was executed
* @return New CREATE_TABLE object or NULL if an error occurred
*/
TABLE_CREATE* table_create_alloc(const char* sql, int len, const char* event_db)
TABLE_CREATE* table_create_alloc(const char* sql, int len, const char* db)
{
/** Extract the table definition so we can get the column names from it */
int stmt_len = 0;
@ -706,7 +706,6 @@ TABLE_CREATE* table_create_alloc(const char* sql, int len, const char* event_db)
ss_dassert(statement_sql);
char table[MYSQL_TABLE_MAXLEN + 1];
char database[MYSQL_DATABASE_MAXLEN + 1];
const char* db = event_db;
const char* err = NULL;
MXS_INFO("Create table: %.*s", len, sql);
@ -719,16 +718,13 @@ TABLE_CREATE* table_create_alloc(const char* sql, int len, const char* event_db)
err = "table name";
}
/** The CREATE statement contains the database name */
else if (strlen(db) == 0)
if (get_database_name(sql, database))
{
if (get_database_name(sql, database))
{
db = database;
}
else
{
err = "database name";
}
db = database;
}
else if (*db == '\0')
{
err = "database name";
}
if (err)
@ -906,6 +902,27 @@ static void remove_extras(char* str)
ss_dassert(strlen(str) == len);
}
static void remove_backticks(char* src)
{
char* dest = src;
while (*src)
{
if (*src != '`')
{
// Non-backtick character, keep it
*dest = *src;
dest++;
}
src++;
}
ss_dassert(dest == src || (*dest != '\0' && dest < src));
*dest = '\0';
}
/**
* Extract both tables from a `CREATE TABLE t1 LIKE t2` statement
*/
@ -1108,10 +1125,12 @@ static bool tok_eq(const char *a, const char *b, size_t len)
void read_alter_identifier(const char *sql, const char *end, char *dest, int size)
{
int len = 0;
const char *tok = get_tok(sql, &len, end);
if (tok && (tok = get_tok(tok + len, &len, end)) && (tok = get_tok(tok + len, &len, end)))
const char *tok = get_tok(sql, &len, end); // ALTER
if (tok && (tok = get_tok(tok + len, &len, end)) // TABLE
&& (tok = get_tok(tok + len, &len, end))) // Table identifier
{
snprintf(dest, size, "%.*s", len, tok);
remove_backticks(dest);
}
}