Examples with StructAddrinfo libcore.io.StructAddrinfo used on opensource projects

Example 6 with StructAddrinfo

use of libcore.io.StructAddrinfo in project robovm by robovm.

the class InetAddress method lookupHostByName.

/**
     * Resolves a hostname to its IP addresses using a cache.
     *
     * @param host the hostname to resolve.
     * @return the IP addresses of the host.
     */
private static InetAddress[] lookupHostByName(String host) throws UnknownHostException {
    BlockGuard.getThreadPolicy().onNetwork();
    // Do we have a result cached?
    Object cachedResult = addressCache.get(host);
    if (cachedResult != null) {
        if (cachedResult instanceof InetAddress[]) {
            // A cached positive result.
            return (InetAddress[]) cachedResult;
        } else {
            // A cached negative result.
            throw new UnknownHostException((String) cachedResult);
        }
    }
    try {
        StructAddrinfo hints = new StructAddrinfo();
        hints.ai_flags = AI_ADDRCONFIG;
        hints.ai_family = AF_UNSPEC;
        // If we don't specify a socket type, every address will appear twice, once
        // for SOCK_STREAM and one for SOCK_DGRAM. Since we do not return the family
        // anyway, just pick one.
        hints.ai_socktype = SOCK_STREAM;
        InetAddress[] addresses = Libcore.os.getaddrinfo(host, hints);
        // TODO: should getaddrinfo set the hostname of the InetAddresses it returns?
        for (InetAddress address : addresses) {
            address.hostName = host;
        }
        addressCache.put(host, addresses);
        return addresses;
    } catch (GaiException gaiException) {
        // http://code.google.com/p/android/issues/detail?id=15722
        if (gaiException.getCause() instanceof ErrnoException) {
            if (((ErrnoException) gaiException.getCause()).errno == EACCES) {
                throw new SecurityException("Permission denied (missing INTERNET permission?)", gaiException);
            }
        }
        // Otherwise, throw an UnknownHostException.
        String detailMessage = "Unable to resolve host \"" + host + "\": " + Libcore.os.gai_strerror(gaiException.error);
        addressCache.putUnknownHost(host, detailMessage);
        throw gaiException.rethrowAsUnknownHostException(detailMessage);
    }
}