net.i2p.util

Class DNSOverHTTPS

java.lang.Object

net.i2p.util.DNSOverHTTPS

All Implemented Interfaces:

EepGet.StatusListener

public class DNSOverHTTPS
extends Object
implements EepGet.StatusListener

Simple implemetation of DNS over HTTPS. Also sets the local clock from the received date header. Warning - not thread-safe. Create new instances as necessary. As of 0.9.49, this supports the RFC 8484 (DNS) format only. Does NOT support the JSON format (used prior to 0.9.49) or RFC 7858 (DNS over TLS). https://developers.google.com/speed/public-dns/docs/dns-over-https https://developers.cloudflare.com/1.1.1.1/dns-over-https/json-format/ https://github.com/curl/curl/wiki/DNS-over-HTTPS

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DNSOverHTTPS.Type DNS query type for IPv4/IPv6 preference.

Field Summary

Fields

Modifier and Type	Field and Description
static String	UA_CLEARNET ESR version of Firefox, same as Tor Browser

Constructor Summary

Constructors

Constructor and Description
DNSOverHTTPS(I2PAppContext context)
DNSOverHTTPS(I2PAppContext context, SSLEepGet.SSLState sslState)

Method Summary

Modifier and Type	Method and Description
void	attemptFailed(String url, long bytesTransferred, long bytesRemaining, int currentAttempt, int numRetries, Exception cause)
void	attempting(String url)
void	bytesTransferred(long alreadyTransferred, int currentWrite, long bytesTransferred, long bytesRemaining, String url) Total length should be == alreadyTransferred + currentWrite + bytesRemaining for all calls
static void	clearCaches()
void	headerReceived(String url, int attemptNum, String key, String val) Use the Date header as a backup time source.
String	lookup(String host) V4_ONLY unless we have only IPv6 address, then V6_ONLY
String	lookup(String host, DNSOverHTTPS.Type type) Lookup in cache, then query servers
static void	main(String[] args)
void	transferComplete(long alreadyTransferred, long bytesTransferred, long bytesRemaining, String url, String outputFile, boolean notModified)
void	transferFailed(String url, long bytesTransferred, long bytesRemaining, int currentAttempt)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UA_CLEARNET

public static final String UA_CLEARNET

ESR version of Firefox, same as Tor Browser

See Also:

Constant Field Values

Constructor Detail

DNSOverHTTPS

public DNSOverHTTPS(I2PAppContext context)

DNSOverHTTPS

public DNSOverHTTPS(I2PAppContext context,
                    SSLEepGet.SSLState sslState)

Method Detail

attemptFailed

public void attemptFailed(String url,
                          long bytesTransferred,
                          long bytesRemaining,
                          int currentAttempt,
                          int numRetries,
                          Exception cause)

Specified by:

attemptFailed in interface EepGet.StatusListener

See Also:

EepGet.StatusListener.bytesTransferred(long, int, long, long, java.lang.String)

attempting

public void attempting(String url)

Specified by:

attempting in interface EepGet.StatusListener

bytesTransferred

public void bytesTransferred(long alreadyTransferred,
                             int currentWrite,
                             long bytesTransferred,
                             long bytesRemaining,
                             String url)

Description copied from interface: EepGet.StatusListener

Total length should be == alreadyTransferred + currentWrite + bytesRemaining for all calls

Specified by:

bytesTransferred in interface EepGet.StatusListener

Parameters:

alreadyTransferred - total of all attempts, not including currentWrite If nonzero on the first call, a partial file of that length was found, _and_ the server supports resume. If zero on a subsequent call after some bytes are transferred (and presumably after an attemptFailed), the server does _not_ support resume and we had to start over. To track _actual_ transfer if the output file could already exist, the listener should keep its own counter, or subtract the initial alreadyTransferred value. And watch out for alreadyTransferred resetting if a resume failed...

currentWrite - since last call to the listener

bytesTransferred - includes headers, retries, redirects, discarded partial downloads, ...

bytesRemaining - on this attempt only, currentWrite already subtracted - or -1 if chunked encoding or server does not return a length

clearCaches

public static void clearCaches()

headerReceived

public void headerReceived(String url,
                           int attemptNum,
                           String key,
                           String val)

Use the Date header as a backup time source. Code from Reseeder. We set the stratum to a lower (better) value than in Reseeder, as Cloudflare and Google probably have a better idea than our reseeds.

Specified by:

headerReceived in interface EepGet.StatusListener

lookup

public String lookup(String host)

V4_ONLY unless we have only IPv6 address, then V6_ONLY

Returns:

null if not found

lookup

public String lookup(String host,
                     DNSOverHTTPS.Type type)

Lookup in cache, then query servers

Returns:

null if not found

main

public static void main(String[] args)

transferComplete

public void transferComplete(long alreadyTransferred,
                             long bytesTransferred,
                             long bytesRemaining,
                             String url,
                             String outputFile,
                             boolean notModified)

Specified by:

transferComplete in interface EepGet.StatusListener

outputFile - null if unknown (output stream constructor)

See Also:

EepGet.StatusListener.bytesTransferred(long, int, long, long, java.lang.String)

transferFailed

public void transferFailed(String url,
                           long bytesTransferred,
                           long bytesRemaining,
                           int currentAttempt)

Specified by:

transferFailed in interface EepGet.StatusListener

See Also:

EepGet.StatusListener.bytesTransferred(long, int, long, long, java.lang.String)