private String detectAgentUrl( HttpServer pServer, JolokiaServerConfig pConfig, String pContextPath) { serverAddress = pServer.getAddress(); InetAddress realAddress; int port; if (serverAddress != null) { realAddress = serverAddress.getAddress(); if (realAddress.isAnyLocalAddress()) { try { realAddress = NetworkUtil.getLocalAddress(); } catch (IOException e) { try { realAddress = InetAddress.getLocalHost(); } catch (UnknownHostException e1) { // Ok, ok. We take the original one realAddress = serverAddress.getAddress(); } } } port = serverAddress.getPort(); } else { realAddress = pConfig.getAddress(); port = pConfig.getPort(); } return String.format( "%s://%s:%d%s", pConfig.getProtocol(), realAddress.getHostAddress(), port, pContextPath); }
/** * Checks if address can be reached using one argument InetAddress.isReachable() version or ping * command if failed. * * @param addr Address to check. * @param reachTimeout Timeout for the check. * @return {@code True} if address is reachable. */ public static boolean reachableByPing(InetAddress addr, int reachTimeout) { try { if (addr.isReachable(reachTimeout)) return true; String cmd = String.format("ping -%s 1 %s", U.isWindows() ? "n" : "c", addr.getHostAddress()); Process myProc = Runtime.getRuntime().exec(cmd); myProc.waitFor(); return myProc.exitValue() == 0; } catch (IOException ignore) { return false; } catch (InterruptedException ignored) { Thread.currentThread().interrupt(); return false; } }
/** * Determine if a host is reachable by attempting to resolve the host name, and then attempting to * open a connection. * * @param hostName Name of the host to connect to. * @return {@code true} if a the host is reachable, {@code false} if the host name cannot be * resolved, or if opening a connection to the host fails. */ protected static boolean isHostReachable(String hostName) { try { // Assume host is unreachable if we can't get its dns entry without getting an exception //noinspection ResultOfMethodCallIgnored InetAddress.getByName(hostName); } catch (UnknownHostException e) { String message = Logging.getMessage("NetworkStatus.UnreachableTestHost", hostName); Logging.verbose(message); return false; } catch (Exception e) { String message = Logging.getMessage("NetworkStatus.ExceptionTestingHost", hostName); Logging.verbose(message); return false; } // Was able to get internet address, but host still might not be reachable because the address // might have been // cached earlier when it was available. So need to try something else. URLConnection connection = null; try { URL url = new URL("http://" + hostName); Proxy proxy = WWIO.configureProxy(); if (proxy != null) connection = url.openConnection(proxy); else connection = url.openConnection(); connection.setConnectTimeout(2000); connection.setReadTimeout(2000); String ct = connection.getContentType(); if (ct != null) return true; } catch (IOException e) { String message = Logging.getMessage("NetworkStatus.ExceptionTestingHost", hostName); Logging.info(message); } finally { if (connection instanceof HttpURLConnection) ((HttpURLConnection) connection).disconnect(); } return false; }