/** Adds a GGEP block with the specified alternate locations to the output stream. */
static void addGGEP(OutputStream out, GGEPContainer ggep) throws IOException {
if (ggep == null || (ggep.locations.size() == 0 && ggep.createTime <= 0))
throw new NullPointerException("null or empty locations");
GGEP info = new GGEP();
if (ggep.locations.size() > 0) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
for (Iterator i = ggep.locations.iterator(); i.hasNext(); ) {
try {
Endpoint ep = (Endpoint) i.next();
baos.write(ep.getHostBytes());
ByteOrder.short2leb((short) ep.getPort(), baos);
} catch (UnknownHostException uhe) {
continue;
}
}
} catch (IOException impossible) {
ErrorService.error(impossible);
}
info.put(GGEP.GGEP_HEADER_ALTS, baos.toByteArray());
}
if (ggep.createTime > 0) info.put(GGEP.GGEP_HEADER_CREATE_TIME, ggep.createTime / 1000);
info.write(out);
}
/**
* @requires this and other have dotted-quad addresses, or names that can be resolved.
* @effects Returns true if this is on the same subnet as 'other', i.e., if this and other are in
* the same IP class and have the same network number.
*/
public boolean isSameSubnet(Endpoint other) {
byte[] a;
byte[] b;
int first;
try {
a = getHostBytes();
first = ByteOrder.ubyte2int(a[0]);
b = other.getHostBytes();
} catch (UnknownHostException e) {
return false;
}
// See http://www.3com.com/nsc/501302.html
// class A
if (first <= 127) return a[0] == b[0];
// class B
else if (first <= 191) return a[0] == b[0] && a[1] == b[1];
// class C
else return a[0] == b[0] && a[1] == b[1] && a[2] == b[2];
}
/**
* Parses a new ExtendedEndpoint. Strictly validates all data. For example, addresses MUST be in
* dotted quad format.
*
* @param line a single line read from the stream
* @return the endpoint constructed from the line
* @exception IOException problem reading from in, e.g., EOF reached prematurely
* @exception ParseException data not in proper format. Does NOT necessarily set the offset of the
* exception properly.
* @see write
*/
public static ExtendedEndpoint read(String line) throws ParseException {
// Break the line into fields. Skip if badly formatted. Note that
// subsequent delimiters are NOT coalesced.
String[] linea = StringUtils.splitNoCoalesce(line, FIELD_SEPARATOR);
if (linea.length == 0) throw new ParseException("Empty line", 0);
// 1. Host and port. As a dirty trick, we use existing code in Endpoint.
// Note that we strictly validate the address to work around corrupted
// gnutella.net files from an earlier version
boolean pureNumeric;
String host;
int port;
try {
Endpoint tmp = new Endpoint(linea[0], true); // require numeric.
host = tmp.getAddress();
port = tmp.getPort();
pureNumeric = true;
} catch (IllegalArgumentException e) {
// Alright, pure numeric failed -- let's try constructing without
// numeric & without requiring a DNS lookup.
try {
Endpoint tmp = new Endpoint(linea[0], false, false);
host = tmp.getAddress();
port = tmp.getPort();
pureNumeric = false;
} catch (IllegalArgumentException e2) {
ParseException e3 =
new ParseException("Couldn't extract address and port from: " + linea[0], 0);
e3.initCause(e2);
throw e3;
}
}
// Build endpoint without any optional data. (We'll set it if possible
// later.)
ExtendedEndpoint ret = new ExtendedEndpoint(host, port, false);
// 2. Average uptime (optional)
if (linea.length >= 2) {
try {
ret.dailyUptime = Integer.parseInt(linea[1].trim());
} catch (NumberFormatException e) {
}
}
// 3. Time of pong (optional). Do NOT use current system tome
// if not set.
ret.timeRecorded = DEFAULT_TIME_RECORDED;
if (linea.length >= 3) {
try {
ret.timeRecorded = Long.parseLong(linea[2].trim());
} catch (NumberFormatException e) {
}
}
// 4. Time of successful connects (optional)
if (linea.length >= 4) {
try {
String times[] = StringUtils.split(linea[3], LIST_SEPARATOR);
for (int i = times.length - 1; i >= 0; i--)
ret.recordConnectionAttempt(ret.connectSuccesses, Long.parseLong(times[i].trim()));
} catch (NumberFormatException e) {
}
}
// 5. Time of failed connects (optional)
if (linea.length >= 5) {
try {
String times[] = StringUtils.split(linea[4], LIST_SEPARATOR);
for (int i = times.length - 1; i >= 0; i--)
ret.recordConnectionAttempt(ret.connectFailures, Long.parseLong(times[i].trim()));
} catch (NumberFormatException e) {
}
}
// 6. locale of the connection (optional)
if (linea.length >= 6) {
ret.setClientLocale(linea[5]);
}
// 7. udp-host
if (linea.length >= 7) {
try {
int i = Integer.parseInt(linea[6]);
if (i >= 0) ret.udpHostCacheFailures = i;
} catch (NumberFormatException nfe) {
}
}
// validate address if numeric.
if (pureNumeric && !NetworkUtils.isValidAddress(host))
throw new ParseException("invalid dotted addr: " + ret, 0);
// validate that non UHC addresses were numeric.
if (!ret.isUDPHostCache() && !pureNumeric)
throw new ParseException("illegal non-UHC endpoint: " + ret, 0);
return ret;
}
