Add ability to set default value for subnet restriction.

lang/en/attendance.php

@@ -363,3 +363,5 @@ $string['extrarestrictions'] = 'Extra restrictions';
 $string['requiresubnet'] = 'Students can only record own attendance from these computers.';
 $string['subnetwrong'] = 'Attendance can only be recorded from certain locations, and this computer is not on the allowed list.';
 $string['requiresubnet_help'] = 'Attendance recording may be restricted to particular subnets by specifying a comma-separated list of partial or full IP addresses.';
+$string['defaultsettings'] = 'Default attendance settings';
+$string['defaultsettings_help'] = 'These settings define the defaults for all new attendances';

settings.php

@@ -44,4 +44,11 @@ if ($ADMIN->fulltree) {
 
     $settings->add(new admin_setting_configcheckbox('attendance/studentscanmark',
         get_string('studentscanmark', 'attendance'), get_string('studentscanmark_desc', 'attendance'), 1));
+
+    $name = new lang_string('defaultsettings', 'mod_attendance');
+    $description = new lang_string('defaultsettings_help', 'mod_attendance');
+    $settings->add(new admin_setting_heading('defaultsettings', $name, $description));
+
+    $settings->add(new admin_setting_configtext('attendance/subnet',
+        get_string('requiresubnet', 'attendance'), get_string('requiresubnet_help', 'attendance'), '', PARAM_RAW));
 }