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;
}