Test alive hosts only

CHANGELOG.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Check if the amount of vts in redis is coherent. 
   [#195](https://github.com/greenbone/ospd-openvas/pull/195)
   [#197](https://github.com/greenbone/ospd-openvas/pull/197)
+- Add support for test_alive_hosts_only feature of openvas. [#204](https://github.com/greenbone/ospd-openvas/pull/204)
 
 ### Changed
 - Less strict checks for the nvti cache version

ospd_openvas/daemon.py

@@ -1569,6 +1569,34 @@ def exec_scan(self, scan_id: str):
             # Set alive test option. Overwrite the scan config settings.
             target_options = self.get_scan_target_options(scan_id)
             if target_options:
+                # Check if test_alive_hosts_only feature of openvas is active.
+                # If active, put ALIVE_TEST enum in preferences.
+                settings = Openvas.get_settings()
+                if settings:
+                    test_alive_hosts_only = settings.get(
+                        'test_alive_hosts_only'
+                    )
+                    if test_alive_hosts_only:
+                        if target_options and target_options.get('alive_test'):
+                            try:
+                                alive_test = int(
+                                    target_options.get('alive_test')
+                                )
+                            except ValueError:
+                                logger.debug(
+                                    'Alive test settings not applied. '
+                                    'Invalid alive test value %s',
+                                    target_options.get('alive_test'),
+                                )
+                            # Put ALIVE_TEST enum in db, this is then taken
+                            # by openvas to determine the method to use
+                            # for the alive test.
+                            if alive_test >= 1 and alive_test <= 31:
+                                item = 'ALIVE_TEST|||%s' % str(alive_test)
+                                kbdb.add_scan_preferences(
+                                    openvas_scan_id, [item]
+                                )
+
                 alive_test_opt = self.build_alive_test_opt_as_prefs(
                     target_options
                 )