Redmine #5727 TFTP protect against empty stuff

1) If the user presses Save when there was no interface selected, and
the user has still not selected an interface, then do not attempt to
unset() tftpdinterface in the config when it is already unset.
2) If the user does backup/restore or other similar stuff when the
tftpboot directory has no files in it, then do not do chmod of the
(non-existent) files. This avoids a "No such file or directory" message
being logged.

3 files changed, 26 insertions, 5 deletions

diff --git a/config/tftp2/tftp.inc b/config/tftp2/tftp.inc
index baf753c9..7ad4ab1b 100644
--- a/config/tftp2/tftp.inc
+++ b/config/tftp2/tftp.inc
@@ -41,6 +41,19 @@ function tftp_byte_convert($bytes) {
 	return round($bytes/pow($convention, $e), 2) . ' ' . $s[$e];
 }
 
+function tftp_dir_contains_files($dir) {
+	if (!is_readable($dir)) {
+		return NULL;
+	}
+	$handle = opendir($dir);
+	while (false !== ($entry = readdir($handle))) {
+		if ($entry != "." && $entry != "..") {
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
 function tftp_install_command() {
 	global $config;
 
@@ -54,7 +67,9 @@ function tftp_install_command() {
 	// Restore backup if it exists
 	if (file_exists($tftpbackup)) {
 		mwexec("/usr/bin/tar xvpfz {$tftpbackup} -C /");
-		mwexec("/bin/chmod -R 0744 {$tftpdir}/*");
+		if (tftp_dir_contains_files($tftpdir)) {
+			mwexec("/bin/chmod -R 0744 {$tftpdir}/*");
+		}
 	}
 	unset($tftpdir, $tftpbackup);
 }
diff --git a/config/tftp2/tftp.xml b/config/tftp2/tftp.xml
index 350999dd..7e5b9746 100644
--- a/config/tftp2/tftp.xml
+++ b/config/tftp2/tftp.xml
@@ -43,7 +43,7 @@
 	]]>
 	</copyright>
 	<name>tftpsettings</name>
-	<version>2.2.4</version>
+	<version>2.2.5</version>
 	<title>TFTP: Settings</title>
 	<include_file>/usr/local/pkg/tftp.inc</include_file>
 	<menu>
diff --git a/config/tftp2/tftp_files.php b/config/tftp2/tftp_files.php
index 0cc08233..cc2947bc 100644
--- a/config/tftp2/tftp_files.php
+++ b/config/tftp2/tftp_files.php
@@ -76,7 +76,9 @@ if ($_GET['a'] == "other") {
 			//echo "The file $filename exists";
 			conf_mount_rw();
 			mwexec("/usr/bin/tar -xpzC / -f {$backup_path}");
-			mwexec("/bin/chmod -R 744 {$files_dir}/*");
+			if (tftp_dir_contains_files($files_dir)) {
+				mwexec("/bin/chmod -R 744 {$files_dir}/*");
+			}
 			header( 'Location: tftp_files.php?savemsg=Backup+has+been+restored.' ) ;
 			conf_mount_ro();
 		} else {
@@ -92,7 +94,9 @@ if ($_POST['submit'] == "Save") {
 		write_config();
 		send_event("filter reload");
 	} else {
-		unset($config['installedpackages']['tftpd']['config'][0]['tftpdinterface']);
+		if (isset($config['installedpackages']['tftpd']['config'][0]['tftpdinterface'])) {
+			unset($config['installedpackages']['tftpd']['config'][0]['tftpdinterface']);
+		}
 		write_config();
 		send_event("filter reload");
 	}
@@ -102,7 +106,9 @@ if (($_POST['submit'] == "Upload") && is_uploaded_file($_FILES['ulfile']['tmp_na
 	conf_mount_rw();
 	move_uploaded_file($_FILES['ulfile']['tmp_name'], "{$files_dir}/{$_FILES['ulfile']['name']}");
 	$savemsg = "Uploaded file to {$files_dir}/" . htmlentities($_FILES['ulfile']['name']);
-	mwexec('/bin/chmod -R 744 {$files_dir}/*');
+	if (tftp_dir_contains_files($files_dir)) {
+		mwexec('/bin/chmod -R 744 {$files_dir}/*');
+	}
 	unset($_POST['txtCommand']);
 	conf_mount_ro();
 }