Merge branch 'PHP-7.4'

* PHP-7.4:
  fix the problem for connect_attr, set db condition, and add a new attribute _server_host

ext/mysqli/tests/mysqli_connect_attr.phpt

@@ -0,0 +1,78 @@
+--TEST--
+mysqli check the session_connect_attrs table for connection attributes
+--SKIPIF--
+<?php
+require_once('skipif.inc');
+require_once('skipifconnectfailure.inc');
+
+if (!$IS_MYSQLND)
+	die("skip: test applies only to mysqlnd");
+
+if (!$link = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket))
+	die("skip Cannot connect to the server");
+
+/* skip test if the server version does not have session_connect_attrs table yet*/
+if (!$res = mysqli_query($link, "select count(*) as count from information_schema.tables where table_schema='performance_schema' and table_name='session_connect_attrs';"))
+    die("skip select from information_schema.tables for session_connect_attrs  query failed");
+
+$tmp = mysqli_fetch_assoc($res);
+mysqli_free_result($res);
+if($tmp['count'] == "0") {
+    mysqli_close($link);
+    die("skip mysql does not support session_connect_attrs table yet");
+}
+
+/* skip test if performance_schema is OFF*/
+if (!$res = mysqli_query($link, "show variables like 'performance_schema';"))
+    die("skip show variables like 'performance_schema' failed");
+
+$tmp = mysqli_fetch_assoc($res);
+mysqli_free_result($res);
+if($tmp['Value'] == "OFF") {
+    mysqli_close($link);
+    die("skip performance_schema is OFF");
+}
+
+mysqli_close($link);
+?>
+--FILE--
+<?php
+	require_once("connect.inc");
+
+	$tmp    = NULL;
+	$link   = NULL;
+    $res    = NULL;
+	if (!$link = mysqli_connect($host, $user, $passwd, $db, $port, $socket))
+		printf("[001] Cannot connect to the server using host=%s, user=%s, passwd=***, dbname=%s, port=%s, socket=%s\n",$host, $user, $db, $port, $socket);
+
+    //in case $host is empty, do not test for _server_host field
+    if (isset($host) && trim($host) != '') {
+        if (!$res = mysqli_query($link, "select * from performance_schema.session_connect_attrs where ATTR_NAME='_server_host' and processlist_id = connection_id()")) {
+            printf("[002] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+        } else {
+            $tmp = mysqli_fetch_assoc($res);
+            if (!$tmp || !isset($tmp['ATTR_NAME'])) {
+                echo "[003] _server_host missing\n";
+            } elseif ($tmp['ATTR_VALUE'] !== $host) {
+                printf("[004] _server_host value mismatch\n") ;
+            }
+            mysqli_free_result($res);
+        }
+    }
+
+    if (!$res = mysqli_query($link, "select * from performance_schema.session_connect_attrs where ATTR_NAME='_client_name' and processlist_id = connection_id()")) {
+        printf("[005] [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+    } else {
+        $tmp = mysqli_fetch_assoc($res);
+        if (!$tmp || !isset($tmp['ATTR_NAME'])) {
+            echo "[006] _client_name missing\n";
+        } elseif ($tmp['ATTR_VALUE'] !== "mysqlnd") {
+            printf("[007] _client_name value mismatch\n") ;
+        }
+        mysqli_free_result($res);
+    }
+
+    printf("done!");
+?>
+--EXPECTF--
+done!

ext/mysqlnd/mysqlnd_auth.c

@@ -420,6 +420,9 @@ mysqlnd_auth_change_user(MYSQLND_CONN_DATA * const conn,
 		auth_packet.auth_data_len = auth_plugin_data_len;
 		auth_packet.auth_plugin_name = auth_protocol;
 
+        if (conn->server_capabilities & CLIENT_CONNECT_ATTRS) {
+			auth_packet.connect_attr = conn->options->connect_attr;
+        }
 
 		if (conn->m->get_server_version(conn) >= 50123) {
 			auth_packet.charset_no	= conn->charset->nr;

ext/mysqlnd/mysqlnd_connection.c

@@ -510,6 +510,10 @@ MYSQLND_METHOD(mysqlnd_conn_data, get_updated_connect_flags)(MYSQLND_CONN_DATA *
 	}
 #endif
 
+    if (conn->options->connect_attr && zend_hash_num_elements(conn->options->connect_attr)) {
+		mysql_flags |= CLIENT_CONNECT_ATTRS;
+	}
+
 	DBG_RETURN(mysql_flags);
 }
 /* }}} */
@@ -653,7 +657,7 @@ MYSQLND_METHOD(mysqlnd_conn_data, connect)(MYSQLND_CONN_DATA * conn,
 		password.s = "";
 		password.l = 0;
 	}
-	if (!database.s) {
+	if (!database.s || !database.s[0]) {
 		DBG_INF_FMT("no db given, using empty string");
 		database.s = "";
 		database.l = 0;
@@ -825,6 +829,9 @@ MYSQLND_METHOD(mysqlnd_conn, connect)(MYSQLND * conn_handle,
 
 	if (PASS == conn->m->local_tx_start(conn, this_func)) {
 		mysqlnd_options4(conn_handle, MYSQL_OPT_CONNECT_ATTR_ADD, "_client_name", "mysqlnd");
+        if (hostname.l > 0) {
+            mysqlnd_options4(conn_handle, MYSQL_OPT_CONNECT_ATTR_ADD, "_server_host", hostname.s);
+        }
 		ret = conn->m->connect(conn, hostname, username, password, database, port, socket_or_pipe, mysql_flags);
 
 		conn->m->local_tx_end(conn, this_func, FAIL);

ext/mysqlnd/mysqlnd_wireprotocol.c

@@ -545,7 +545,7 @@ size_t php_mysqlnd_auth_write(MYSQLND_CONN_DATA * conn, void * _packet)
 			p+= packet->auth_data_len;
 		}
 
-		if (packet->db) {
+		if (packet->db_len > 0) {
 			/* CLIENT_CONNECT_WITH_DB should have been set */
 			size_t real_db_len = MIN(MYSQLND_MAX_ALLOWED_DB_LEN, packet->db_len);
 			memcpy(p, packet->db, real_db_len);

ext/pdo_mysql/tests/pdo_mysql_connect_attr.phpt

@@ -0,0 +1,58 @@
+--TEST--
+PDO_MYSQL: check the session_connect_attrs table for connection attributes
+--SKIPIF--
+<?php
+require_once(__DIR__ . DIRECTORY_SEPARATOR . 'skipif.inc');
+require_once(__DIR__ . DIRECTORY_SEPARATOR . 'mysql_pdo_test.inc');
+MySQLPDOTest::skip();
+if (!MySQLPDOTest::isPDOMySQLnd()) die('skip only for mysqlnd');
+
+$pdo = MySQLPDOTest::factory();
+
+$stmt = $pdo->query("select count(*) from information_schema.tables where table_schema='performance_schema' and table_name='session_connect_attrs'");
+if (!$stmt || !$stmt->fetchColumn()) {
+    die("skip mysql does not support session_connect_attrs table yet");
+}
+
+$stmt = $pdo->query("show variables like 'performance_schema'");
+if (!$stmt || $stmt->fetchColumn(1) !== 'ON') {
+    die("skip performance_schema is OFF");
+}
+
+?>
+--FILE--
+<?php
+
+require_once(__DIR__ . DIRECTORY_SEPARATOR . 'mysql_pdo_test.inc');
+$pdo = MySQLPDOTest::factory();
+
+if (preg_match('/host=([^;]+)/', PDO_MYSQL_TEST_DSN, $m)) {
+    $host = $m[1];
+}
+
+//in case $host is empty, do not test for _server_host field
+if (isset($host) && $host !== '') {
+    $stmt = $pdo->query("select * from performance_schema.session_connect_attrs where ATTR_NAME='_server_host' and processlist_id = connection_id()");
+
+    $row = $stmt->fetch(PDO::FETCH_ASSOC);
+
+    if (!$row || !isset($row['attr_name'])) {
+        echo "_server_host missing\n";
+    } elseif ($row['attr_value'] !== $host) {
+        printf("_server_host mismatch (expected '%s', got '%s')\n", $host, $row['attr_value']);
+    }
+}
+
+$stmt = $pdo->query("select * from performance_schema.session_connect_attrs where ATTR_NAME='_client_name' and processlist_id = connection_id()");
+
+$row = $stmt->fetch(PDO::FETCH_ASSOC);
+if (!$row || !isset($row['attr_name'])) {
+    echo "_client_name missing\n";
+} elseif ($row['attr_value'] !== 'mysqlnd') {
+    printf("_client_name mismatch (expected 'mysqlnd', got '%s')\n", $row['attr_value']);
+}
+
+printf("done!");
+?>
+--EXPECT--
+done!