Merge pull request #168

Fix compatibility with new MariaDB client and server versions

Author: pali

Makefile.PL

@@ -757,7 +757,13 @@ sub Configure {
                     # libmysqld.a from MySQL 8.x is broken too
                     $function .= "\n#if !defined(MARIADB_BASE_VERSION) && !defined(MARIADB_PACKAGE_VERSION)\nif (mysql_get_client_version() >= 80000) return 1;\n#endif\n";
                 }
-                $function .= 'return (mysql_get_client_version() == MYSQL_VERSION_ID) ? 0 : 1;';
+                # MariaDB Connector/C 3.1.10+ has broken mysql_get_client_version() function, so use mariadb_get_infov(MARIADB_CLIENT_VERSION_ID) instead
+                $function .= "size_t version;\n";
+                $function .= "#if defined(MARIADB_PACKAGE_VERSION) && defined(MARIADB_PACKAGE_VERSION_ID) && MARIADB_PACKAGE_VERSION_ID >= 30000\n";
+                $function .= "if (mariadb_get_infov((void *)0, MARIADB_CLIENT_VERSION_ID, &version) != 0)\n";
+                $function .= "#endif\n";
+                $function .= "version = mysql_get_client_version();\n";
+                $function .= 'return (version == MYSQL_VERSION_ID) ? 0 : 1;';
                 # libmysqld is built using g++ rather than gcc and sometimes
                 # we have to use libstdc++ to resolve linking problems
                 foreach my $add_ldflags (undef, '-lstdc++') {

dbdimp.c

@@ -627,6 +627,25 @@ static char **fill_out_embedded_options(char *options,
   return options_list;
 }
 
+#if MYSQL_VERSION_ID < 50001
+/* MySQL client prior to version 5.0.1 does not implement mysql_real_escape_string() for SERVER_STATUS_NO_BACKSLASH_ESCAPES */
+static unsigned long string_escape_quotes(char *to, const char *from, unsigned long len)
+{
+  const char *to_start = to;
+  const char *end = from + len;
+
+  while (from < end)
+  {
+    if (*from == '\'')
+      *to++ = '\'';
+    *to++ = *from++;
+  }
+
+  *to = '\0';
+  return to - to_start;
+}
+#endif
+
 /*
   constructs an SQL statement previously prepared with
   actual values replacing placeholders
@@ -838,9 +857,8 @@ static char *parse_params(
 #if MYSQL_VERSION_ID < 50001
             if (sock->server_status & SERVER_STATUS_NO_BACKSLASH_ESCAPES)
             {
-              *ptr++ = 'X';
               *ptr++ = '\'';
-              ptr += mysql_hex_string(ptr, ph->value, ph->len);
+              ptr += string_escape_quotes(ptr, ph->value, ph->len);
               *ptr++ = '\'';
             }
             else
@@ -6411,9 +6429,8 @@ SV* mariadb_db_quote(SV *dbh, SV *str, SV *type)
 #if MYSQL_VERSION_ID < 50001
       if (imp_dbh->pmysql->server_status & SERVER_STATUS_NO_BACKSLASH_ESCAPES)
       {
-        *sptr++ = 'X';
         *sptr++ = '\'';
-        sptr += mysql_hex_string(sptr, ptr, len);
+        sptr += string_escape_quotes(sptr, ptr, len);
         *sptr++ = '\'';
       }
       else

dbdimp.h

@@ -322,6 +322,32 @@ PERL_STATIC_INLINE UV SvUV_nomg(pTHX_ SV *sv)
 #define my_bool bool
 #endif
 
+/*
+ * MariaDB Connector/C 3.1.10 changed API of mysql_get_client_version()
+ * function. Before that release it returned client version. With that release
+ * it started returning Connector/C package version.
+ *
+ * So when compiling with MariaDB Connector/C client library, redefine
+ * mysql_get_client_version() to always returns client version via function
+ * mariadb_get_infov(MARIADB_CLIENT_VERSION_ID) call.
+ *
+ * Driver code expects for a long time that mysql_get_client_version() call
+ * returns client version and not something different.
+ *
+ * Function mariadb_get_infov() is supported since MariaDB Connector/C 3.0+.
+ */
+#if defined(MARIADB_PACKAGE_VERSION) && defined(MARIADB_PACKAGE_VERSION_ID) && MARIADB_PACKAGE_VERSION_ID >= 30000
+PERL_STATIC_INLINE unsigned long mariadb_get_client_version(void)
+{
+  /* MARIADB_CLIENT_VERSION_ID really expects size_t type, documentation is wrong and says unsigned int. */
+  size_t version;
+  if (mariadb_get_infov(NULL, MARIADB_CLIENT_VERSION_ID, &version) != 0)
+    version = mysql_get_client_version(); /* On error fallback to mysql_get_client_version() */
+  return version;
+}
+#define mysql_get_client_version() mariadb_get_client_version()
+#endif
+
 /* MYSQL_SECURE_AUTH became a no-op from MySQL 5.7.5 and is removed from MySQL 8.0.3 */
 #if defined(MARIADB_BASE_VERSION) || MYSQL_VERSION_ID <= 50704
 #define HAVE_SECURE_AUTH

t/40server_prepare.t

@@ -72,16 +72,19 @@ ok($sth3->execute(1, 2), "insert t3");
 
 is_deeply($dbh->selectall_arrayref('SELECT id, mydata FROM t3'), [[1, 2]]);
 
+# MariaDB server since version 10.6.2 can prepare all statements except PREPARE, EXECUTE, and DEALLOCATE / DROP PREPARE. Previous MariaDB and MySQL versions cannot prepare USE statement.
+my $non_preparable_statement = ($dbh->{mariadb_serverversion} >= 100602) ? q(PREPARE stmt FROM "SELECT 1") : ("USE " . $dbh->quote_identifier($test_db));
+
 $dbh->{mariadb_server_prepare_disable_fallback} = 1;
 my $error_handler_called = 0;
 $dbh->{HandleError} = sub { $error_handler_called = 1; die $_[0]; };
-eval { $dbh->prepare("USE " . $dbh->quote_identifier($test_db)) };
+eval { $dbh->prepare($non_preparable_statement); };
 $dbh->{HandleError} = undef;
-ok($error_handler_called, 'USE is not supported with mariadb_server_prepare_disable_fallback=1');
+ok($error_handler_called, "Non-preparable statement '$non_preparable_statement' is not supported with mariadb_server_prepare_disable_fallback=1");
 
 $dbh->{mariadb_server_prepare_disable_fallback} = 0;
 my $sth4;
-ok($sth4 = $dbh->prepare("USE " . $dbh->quote_identifier($test_db)), 'USE is supported with mariadb_server_prepare_disable_fallback=0');
+ok($sth4 = $dbh->prepare($non_preparable_statement), "Non-preparable statement '$non_preparable_statement' is supported with mariadb_server_prepare_disable_fallback=0");
 ok($sth4->execute());
 
 ok ($dbh->do(qq{DROP TABLE t3}), "cleaning up");

t/45bind_no_backslash_escapes.t

@@ -18,10 +18,6 @@ if ($dbh->{mariadb_serverversion} < 50001) {
     plan skip_all => "Servers < 5.0.1 do not support sql_mode NO_BACKSLASH_ESCAPES";
 }
 
-if ($dbh->{mariadb_clientversion} < 50001) {
-    $id2_quoted_no_backslash = q(X'737472696E675C737472696E6722737472696E6727737472696E67');
-}
-
 plan tests => 20;
 
 ok $dbh->do('CREATE TEMPORARY TABLE t(id VARCHAR(255), value TEXT)');