Fix bug #77680: Correctly implement recursive mkdir on FTP stream

If the root directory was missing, an extra CWD without arguments was
made. Also, the MKD contained an empty string.

Now the CWD will use / and MKDs will be issued starting from the root
directory.

NEWS

@@ -2,7 +2,7 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? 2019, PHP 7.2.18
 
-- interbase:
+- Interbase:
   . Fixed bug #72175 (Impossibility of creating multiple connections to
     Interbase with php 7.x). (Nikita)
 
@@ -12,6 +12,10 @@ PHP                                                                        NEWS
 - Reflection:
   . Fixed bug #77772 (ReflectionClass::getMethods(null) doesn't work). (Nikita)
 
+- Standard:
+  . Fixed bug #77680 (recursive mkdir on ftp stream wrapper is incorrect).
+    (Vlad Temian)
+
 04 Apr 2019, PHP 7.2.17
 
 - Core:

ext/ftp/tests/server.inc

@@ -289,8 +289,13 @@ if ($pid) {
             }
 
 		}elseif (preg_match("~^CWD ([A-Za-z./]+)\r\n$~", $buf, $m)) {
-			change_dir($m[1]);
-			fputs($s, "250 CWD command successful.\r\n");
+			if (isset($bug77680)) {
+				fputs($s, "550 Directory change to $m[1] failed: file does not exist\r\n");
+				var_dump($buf);
+			} else {
+				change_dir($m[1]);
+				fputs($s, "250 CWD command successful.\r\n");
+			}
 
 		} elseif (preg_match("~^NLST(?: ([A-Za-z./]+))?\r\n$~", $buf, $m)) {
 
@@ -332,6 +337,9 @@ if ($pid) {
 			if (isset($bug7216)) {
 				fputs($s, "257 OK.\r\n");
 			} else {
+				if (isset($bug77680)) {
+					var_dump($buf);
+				}
 				fputs($s, "257 \"/path/to/ftproot$cwd$m[1]\" created.\r\n");
 			}
 

ext/standard/ftp_fopen_wrapper.c

@@ -1070,41 +1070,40 @@ static int php_stream_ftp_mkdir(php_stream_wrapper *wrapper, const char *url, in
 
         /* find a top level directory we need to create */
         while ((p = strrchr(buf, '/'))) {
-            *p = '\0';
-			php_stream_printf(stream, "CWD %s\r\n", buf);
+			*p = '\0';
+			php_stream_printf(stream, "CWD %s\r\n", strlen(buf) ? buf : "/");
 			result = GET_FTP_RESULT(stream);
 			if (result >= 200 && result <= 299) {
 				*p = '/';
 				break;
 			}
-        }
-        if (p == buf) {
-			php_stream_printf(stream, "MKD %s\r\n", resource->path);
-			result = GET_FTP_RESULT(stream);
-        } else {
-			php_stream_printf(stream, "MKD %s\r\n", buf);
-			result = GET_FTP_RESULT(stream);
-			if (result >= 200 && result <= 299) {
-				if (!p) {
-					p = buf;
-				}
-				/* create any needed directories if the creation of the 1st directory worked */
-				while (++p != e) {
-					if (*p == '\0' && *(p + 1) != '\0') {
-						*p = '/';
-						php_stream_printf(stream, "MKD %s\r\n", buf);
-						result = GET_FTP_RESULT(stream);
-						if (result < 200 || result > 299) {
-							if (options & REPORT_ERRORS) {
-								php_error_docref(NULL, E_WARNING, "%s", tmp_line);
-							}
-							break;
+		}
+
+		php_stream_printf(stream, "MKD %s\r\n", strlen(buf) ? buf : "/");
+		result = GET_FTP_RESULT(stream);
+
+		if (result >= 200 && result <= 299) {
+			if (!p) {
+				p = buf;
+			}
+			/* create any needed directories if the creation of the 1st directory worked */
+			while (p != e) {
+				if (*p == '\0' && *(p + 1) != '\0') {
+					*p = '/';
+					php_stream_printf(stream, "MKD %s\r\n", buf);
+					result = GET_FTP_RESULT(stream);
+					if (result < 200 || result > 299) {
+						if (options & REPORT_ERRORS) {
+							php_error_docref(NULL, E_WARNING, "%s", tmp_line);
 						}
+						break;
 					}
 				}
+				++p;
 			}
 		}
-        efree(buf);
+
+		efree(buf);
     }
 
 	php_url_free(resource);

ext/standard/tests/streams/bug77680.phpt

@@ -0,0 +1,36 @@
+--TEST--
+Recursive mkdir() on ftp should create missing directories.
+--SKIPIF--
+<?php
+if (array_search('ftp',stream_get_wrappers()) === FALSE) die("skip ftp wrapper not available.");
+if (!function_exists('pcntl_fork')) die("skip pcntl_fork() not available.");
+?>
+--FILE--
+<?php
+$bug77680=1;
+
+require __DIR__ . "/../../../ftp/tests/server.inc";
+
+$path = "ftp://localhost:" . $port."/one/two/three/";
+mkdir($path, 0755, true);
+
+?>
+==DONE==
+--EXPECTF--
+string(20) "CWD /one/two/three
+"
+string(14) "CWD /one/two
+"
+string(10) "CWD /one
+"
+string(7) "CWD /
+"
+string(7) "MKD /
+"
+string(10) "MKD /one
+"
+string(14) "MKD /one/two
+"
+string(20) "MKD /one/two/three
+"
+==DONE==