Fix bug #74764 and add a test case

Author: Ville Hukkamaki

NEWS

@@ -12,6 +12,8 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed bug #73457 (Wrong error message when fopen FTP wrapped fails to open
     data connection). (Ville Hukkamäki)
+  . Fixed bug #74764 (Bindto IPv6 works with file_get_contents but fails with 
+    stream_socket_client). (Ville Hukkamäki)
 
 13 Sep 2018, PHP 7.1.22
 

ext/standard/tests/network/bug74764.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Bug #74764 IPv6 bindto fails with stream_socket_client()
+--SKIPIF--
+<?php
+/* following copied straight from the tcp6loop.phpt */
+@stream_socket_client('tcp://[::1]:0', $errno);
+if ($errno != 111) die('skip IPv6 not supported.');
+?>
+--FILE--
+<?php
+$context = stream_context_create(
+    ['socket' => array('bindto' => "[::]:0")]
+    );
+    $socket = stream_socket_client('tcp://localhost:1443', $errno, $errstr, 5, STREAM_CLIENT_CONNECT, $context);
+
+$context = stream_context_create(
+    array('socket' => array('bindto' => "0.0.0.0:0"))
+    );
+    $socket = stream_socket_client('tcp://localhost:1443', $errno, $errstr, 5, STREAM_CLIENT_CONNECT, $context);
+?>
+--EXPECTF--
+Warning: stream_socket_client(): unable to connect to tcp://localhost:1443 (%s) in %s on line %d
+
+Warning: stream_socket_client(): unable to connect to tcp://localhost:1443 (%s) in %s on line %d

main/network.c

@@ -863,6 +863,9 @@ php_socket_t php_network_connect_socket_to_host(const char *host, unsigned short
 				int local_address_len = 0;
 
 				if (sa->sa_family == AF_INET) {
+					if (strchr(bindto,':')) {
+						goto skip_bind;
+					}
 					struct sockaddr_in *in4 = emalloc(sizeof(struct sockaddr_in));
 
 					local_address = (struct sockaddr*)in4;