+/**
+ * Checks whether a host can be used to start testbed service
+ *
+ * @param host the host to check
+ * @param config the configuration handle to lookup the path of the testbed helper
+ * @return GNUNET_YES if testbed service can be started on the given host
+ * remotely; GNUNET_NO if not
+ */
+int
+GNUNET_TESTBED_is_host_habitable (const struct GNUNET_TESTBED_Host *host,
+ const struct GNUNET_CONFIGURATION_Handle *config)
+{
+ char *remote_args[11];
+ char *helper_binary_path;
+ char *portstr;
+ char *ssh_addr;
+ const char *hostname;
+ struct GNUNET_OS_Process *auxp;
+ unsigned long code;
+ enum GNUNET_OS_ProcessStatusType type;
+ int ret;
+ unsigned int argp;
+
+ portstr = NULL;
+ ssh_addr = NULL;
+ hostname = (NULL == host->hostname) ? "127.0.0.1" : host->hostname;
+ if (NULL == host->username)
+ ssh_addr = GNUNET_strdup (hostname);
+ else
+ GNUNET_asprintf (&ssh_addr, "%s@%s", host->username, hostname);
+ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (config, "testbed",
+ "HELPER_BINARY_PATH",
+ &helper_binary_path))
+ helper_binary_path = GNUNET_OS_get_libexec_binary_path (HELPER_TESTBED_BINARY);
+ argp = 0;
+ remote_args[argp++] = "ssh";
+ GNUNET_asprintf (&portstr, "%u", host->port);
+ remote_args[argp++] = "-p";
+ remote_args[argp++] = portstr;
+ remote_args[argp++] = "-o";
+ remote_args[argp++] = "BatchMode=yes";
+ remote_args[argp++] = "-o";
+ remote_args[argp++] = "NoHostAuthenticationForLocalhost=yes";
+ remote_args[argp++] = ssh_addr;
+ remote_args[argp++] = "stat";
+ remote_args[argp++] = helper_binary_path;
+ remote_args[argp++] = NULL;
+ GNUNET_assert (argp == 11);
+ auxp =
+ GNUNET_OS_start_process_vap (GNUNET_NO, GNUNET_OS_INHERIT_STD_ERR, NULL,
+ NULL, "ssh", remote_args);
+ if (NULL == auxp)
+ {
+ GNUNET_free (ssh_addr);
+ GNUNET_free (portstr);
+ return GNUNET_NO;
+ }
+ do
+ {
+ ret = GNUNET_OS_process_status (auxp, &type, &code);
+ GNUNET_assert (GNUNET_SYSERR != ret);
+ (void) usleep (300);
+ }
+ while (GNUNET_NO == ret);
+ GNUNET_OS_process_destroy (auxp);
+ GNUNET_free (ssh_addr);
+ GNUNET_free (portstr);
+ GNUNET_free (helper_binary_path);
+ return (0 != code) ? GNUNET_NO : GNUNET_YES;
+}
+