API council feedbacks for DnsResolver (4219ab68) · Commits · e / os / android_frameworks_base

api/current.txt

+11 −20

Original line number	Diff line number	Diff line
		@@ -27227,10 +27227,13 @@ package android.net {

		public final class DnsResolver {
		method @NonNull public static android.net.DnsResolver getInstance();
		method public <T> void query(@Nullable android.net.Network, @NonNull byte[], int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.AnswerCallback<T>);
		method public <T> void query(@Nullable android.net.Network, @NonNull String, int, int, int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.AnswerCallback<T>);
		method public void query(@Nullable android.net.Network, @NonNull String, int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.InetAddressAnswerCallback);
		method public void query(@Nullable android.net.Network, @NonNull String, int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.Callback<? super java.util.List<java.net.InetAddress>>);
		method public void query(@Nullable android.net.Network, @NonNull String, int, int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.Callback<? super java.util.List<java.net.InetAddress>>);
		method public void rawQuery(@Nullable android.net.Network, @NonNull byte[], int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.Callback<? super byte[]>);
		method public void rawQuery(@Nullable android.net.Network, @NonNull String, int, int, int, @NonNull java.util.concurrent.Executor, @Nullable android.os.CancellationSignal, @NonNull android.net.DnsResolver.Callback<? super byte[]>);
		field public static final int CLASS_IN = 1; // 0x1
		field public static final int ERROR_PARSE = 0; // 0x0
		field public static final int ERROR_SYSTEM = 1; // 0x1
		field public static final int FLAG_EMPTY = 0; // 0x0
		field public static final int FLAG_NO_CACHE_LOOKUP = 4; // 0x4
		field public static final int FLAG_NO_CACHE_STORE = 2; // 0x2
		@@ -27239,23 +27242,13 @@ package android.net {
		field public static final int TYPE_AAAA = 28; // 0x1c
		}

		public abstract static class DnsResolver.AnswerCallback<T> {
		ctor public DnsResolver.AnswerCallback(@NonNull android.net.DnsResolver.AnswerParser<T>);
		method public abstract void onAnswer(@NonNull T);
		method public abstract void onParseException(@NonNull android.net.ParseException);
		method public abstract void onQueryException(@NonNull android.system.ErrnoException);
		public static interface DnsResolver.Callback<T> {
		method public void onAnswer(@NonNull T, int);
		method public void onError(@NonNull android.net.DnsResolver.DnsException);
		}

		public static interface DnsResolver.AnswerParser<T> {
		method @NonNull public T parse(@NonNull byte[]) throws android.net.ParseException;
		}

		public abstract static class DnsResolver.InetAddressAnswerCallback extends android.net.DnsResolver.AnswerCallback<java.util.List<java.net.InetAddress>> {
		ctor public DnsResolver.InetAddressAnswerCallback();
		}

		public abstract static class DnsResolver.RawAnswerCallback extends android.net.DnsResolver.AnswerCallback<byte[]> {
		ctor public DnsResolver.RawAnswerCallback();
		public static class DnsResolver.DnsException extends java.lang.Exception {
		field public final int code;
		}

		public class InetAddresses {
		@@ -27580,8 +27573,6 @@ package android.net {
		}

		public class ParseException extends java.lang.RuntimeException {
		ctor public ParseException(@NonNull String);
		ctor public ParseException(@NonNull String, @NonNull Throwable);
		field public String response;
		}

core/java/android/net/DnsResolver.java

+160 −124

Original line number	Diff line number	Diff line
		@@ -93,6 +93,23 @@ public final class DnsResolver {
		public static final int FLAG_NO_CACHE_STORE = 1 << 1;
		public static final int FLAG_NO_CACHE_LOOKUP = 1 << 2;

		@IntDef(prefix = { "ERROR_" }, value = {
		ERROR_PARSE,
		ERROR_SYSTEM
		})
		@Retention(RetentionPolicy.SOURCE)
		@interface DnsError {}
		/**
		* Indicates that there was an error parsing the response the query.
		* The cause of this error is available via getCause() and is a ParseException.
		*/
		public static final int ERROR_PARSE = 0;
		/**
		* Indicates that there was an error sending the query.
		* The cause of this error is available via getCause() and is an ErrnoException.
		*/
		public static final int ERROR_SYSTEM = 1;

		private static final int NETID_UNSET = 0;

		private static final DnsResolver sInstance = new DnsResolver();
		@@ -107,97 +124,57 @@ public final class DnsResolver {
		private DnsResolver() {}

		/**
		* Answer parser for parsing raw answers
		*
		* @param <T> The type of the parsed answer
		*/
		public interface AnswerParser<T> {
		/**
		* Creates a <T> answer by parsing the given raw answer.
		* Base interface for answer callbacks
		*
		* @param rawAnswer the raw answer to be parsed
		* @return a parsed <T> answer
		* @throws ParseException if parsing failed
		* @param <T> The type of the answer
		*/
		@NonNull T parse(@NonNull byte[] rawAnswer) throws ParseException;
		}

		/**
		* Base class for answer callbacks
		*
		* @param <T> The type of the parsed answer
		*/
		public abstract static class AnswerCallback<T> {
		/** @hide */
		public final AnswerParser<T> parser;

		public AnswerCallback(@NonNull AnswerParser<T> parser) {
		this.parser = parser;
		};

		public interface Callback<T> {
		/**
		* Success response to
		* {@link android.net.DnsResolver#query query()}.
		* {@link android.net.DnsResolver#query query()} or
		* {@link android.net.DnsResolver#rawQuery rawQuery()}.
		*
		* Invoked when the answer to a query was successfully parsed.
		*
		* @param answer parsed answer to the query.
		* @param answer <T> answer to the query.
		* @param rcode The response code in the DNS response.
		*
		* {@see android.net.DnsResolver#query query()}
		*/
		public abstract void onAnswer(@NonNull T answer);

		void onAnswer(@NonNull T answer, int rcode);
		/**
		* Error response to
		* {@link android.net.DnsResolver#query query()}.
		* {@link android.net.DnsResolver#query query()} or
		* {@link android.net.DnsResolver#rawQuery rawQuery()}.
		*
		* Invoked when there is no valid answer to
		* {@link android.net.DnsResolver#query query()}
		* {@link android.net.DnsResolver#rawQuery rawQuery()}.
		*
		* @param exception a {@link ParseException} object with additional
		* @param error a {@link DnsException} object with additional
		* detail regarding the failure
		*/
		public abstract void onParseException(@NonNull ParseException exception);

		/**
		* Error response to
		* {@link android.net.DnsResolver#query query()}.
		*
		* Invoked if an error happens when
		* issuing the DNS query or receiving the result.
		* {@link android.net.DnsResolver#query query()}
		*
		* @param exception an {@link ErrnoException} object with additional detail
		* regarding the failure
		*/
		public abstract void onQueryException(@NonNull ErrnoException exception);
		void onError(@NonNull DnsException error);
		}

		/**
		* Callback for receiving raw answers
		* Class to represent DNS error
		*/
		public abstract static class RawAnswerCallback extends AnswerCallback<byte[]> {
		public RawAnswerCallback() {
		super(rawAnswer -> rawAnswer);
		}
		}

		public static class DnsException extends Exception {
		/**
		* Callback for receiving parsed {@link InetAddress} answers
		*
		* Note that if the answer does not contain any IP addresses,
		* onAnswer will be called with an empty list.
		* DNS error code as one of the ERROR_* constants
		*/
		public abstract static class InetAddressAnswerCallback
		extends AnswerCallback<List<InetAddress>> {
		public InetAddressAnswerCallback() {
		super(rawAnswer -> new DnsAddressAnswer(rawAnswer).getAddresses());
		@DnsError public final int code;

		DnsException(@DnsError int code, @Nullable Throwable cause) {
		super(cause);
		this.code = code;
		}
		}

		/**
		* Send a raw DNS query.
		* The answer will be provided asynchronously through the provided {@link AnswerCallback}.
		* The answer will be provided asynchronously through the provided {@link Callback}.
		*
		* @param network {@link Network} specifying which network to query on.
		* {@code null} for query on default network.
		@@ -206,13 +183,13 @@ public final class DnsResolver {
		* @param executor The {@link Executor} that the callback should be executed on.
		* @param cancellationSignal used by the caller to signal if the query should be
		* cancelled. May be {@code null}.
		* @param callback an {@link AnswerCallback} which will be called to notify the caller
		* @param callback a {@link Callback} which will be called to notify the caller
		* of the result of dns query.
		*/
		public <T> void query(@Nullable Network network, @NonNull byte[] query, @QueryFlag int flags,
		public void rawQuery(@Nullable Network network, @NonNull byte[] query, @QueryFlag int flags,
		@NonNull @CallbackExecutor Executor executor,
		@Nullable CancellationSignal cancellationSignal,
		@NonNull AnswerCallback<T> callback) {
		@NonNull Callback<? super byte[]> callback) {
		if (cancellationSignal != null && cancellationSignal.isCanceled()) {
		return;
		}
		@@ -222,9 +199,7 @@ public final class DnsResolver {
		queryfd = resNetworkSend((network != null
		? network.netId : NETID_UNSET), query, query.length, flags);
		} catch (ErrnoException e) {
		executor.execute(() -> {
		callback.onQueryException(e);
		});
		executor.execute(() -> callback.onError(new DnsException(ERROR_SYSTEM, e)));
		return;
		}

		@@ -237,7 +212,7 @@ public final class DnsResolver {

		/**
		* Send a DNS query with the specified name, class and query type.
		* The answer will be provided asynchronously through the provided {@link AnswerCallback}.
		* The answer will be provided asynchronously through the provided {@link Callback}.
		*
		* @param network {@link Network} specifying which network to query on.
		* {@code null} for query on default network.
		@@ -248,14 +223,14 @@ public final class DnsResolver {
		* @param executor The {@link Executor} that the callback should be executed on.
		* @param cancellationSignal used by the caller to signal if the query should be
		* cancelled. May be {@code null}.
		* @param callback an {@link AnswerCallback} which will be called to notify the caller
		* @param callback a {@link Callback} which will be called to notify the caller
		* of the result of dns query.
		*/
		public <T> void query(@Nullable Network network, @NonNull String domain,
		public void rawQuery(@Nullable Network network, @NonNull String domain,
		@QueryClass int nsClass, @QueryType int nsType, @QueryFlag int flags,
		@NonNull @CallbackExecutor Executor executor,
		@Nullable CancellationSignal cancellationSignal,
		@NonNull AnswerCallback<T> callback) {
		@NonNull Callback<? super byte[]> callback) {
		if (cancellationSignal != null && cancellationSignal.isCanceled()) {
		return;
		}
		@@ -265,9 +240,7 @@ public final class DnsResolver {
		queryfd = resNetworkQuery((network != null
		? network.netId : NETID_UNSET), domain, nsClass, nsType, flags);
		} catch (ErrnoException e) {
		executor.execute(() -> {
		callback.onQueryException(e);
		});
		executor.execute(() -> callback.onError(new DnsException(ERROR_SYSTEM, e)));
		return;
		}
		synchronized (lock) {
		@@ -277,27 +250,28 @@ public final class DnsResolver {
		}
		}

		private class InetAddressAnswerAccumulator extends InetAddressAnswerCallback {
		private class InetAddressAnswerAccumulator implements Callback<byte[]> {
		private final List<InetAddress> mAllAnswers;
		private ParseException mParseException;
		private ErrnoException mErrnoException;
		private final InetAddressAnswerCallback mUserCallback;
		private int mRcode;
		private DnsException mDnsException;
		private final Callback<? super List<InetAddress>> mUserCallback;
		private final int mTargetAnswerCount;
		private int mReceivedAnswerCount = 0;

		InetAddressAnswerAccumulator(int size, @NonNull InetAddressAnswerCallback callback) {
		InetAddressAnswerAccumulator(int size,
		@NonNull Callback<? super List<InetAddress>> callback) {
		mTargetAnswerCount = size;
		mAllAnswers = new ArrayList<>();
		mUserCallback = callback;
		}

		private boolean maybeReportException() {
		if (mErrnoException != null) {
		mUserCallback.onQueryException(mErrnoException);
		private boolean maybeReportError() {
		if (mRcode != 0) {
		mUserCallback.onAnswer(mAllAnswers, mRcode);
		return true;
		}
		if (mParseException != null) {
		mUserCallback.onParseException(mParseException);
		if (mDnsException != null) {
		mUserCallback.onError(mDnsException);
		return true;
		}
		return false;
		@@ -305,34 +279,43 @@ public final class DnsResolver {

		private void maybeReportAnswer() {
		if (++mReceivedAnswerCount != mTargetAnswerCount) return;
		if (mAllAnswers.isEmpty() && maybeReportException()) return;
		if (mAllAnswers.isEmpty() && maybeReportError()) return;
		// TODO: Do RFC6724 sort.
		mUserCallback.onAnswer(mAllAnswers);
		mUserCallback.onAnswer(mAllAnswers, mRcode);
		}

		@Override
		public void onAnswer(@NonNull List<InetAddress> answer) {
		mAllAnswers.addAll(answer);
		maybeReportAnswer();
		public void onAnswer(@NonNull byte[] answer, int rcode) {
		// If at least one query succeeded, return an rcode of 0.
		// Otherwise, arbitrarily return the first rcode received.
		if (mReceivedAnswerCount == 0 \|\| rcode == 0) {
		mRcode = rcode;
		}
		try {
		mAllAnswers.addAll(new DnsAddressAnswer(answer).getAddresses());
		} catch (ParseException e) {
		mDnsException = new DnsException(ERROR_PARSE, e);
		}

		@Override
		public void onParseException(@NonNull ParseException e) {
		mParseException = e;
		maybeReportAnswer();
		}

		@Override
		public void onQueryException(@NonNull ErrnoException e) {
		mErrnoException = e;
		public void onError(@NonNull DnsException error) {
		mDnsException = error;
		maybeReportAnswer();
		}
		}

		/**
		* Send a DNS query with the specified name, get back a set of InetAddresses asynchronously.
		* The answer will be provided asynchronously through the provided
		* {@link InetAddressAnswerCallback}.
		* Send a DNS query with the specified name on a network with both IPv4 and IPv6,
		* get back a set of InetAddresses asynchronously.
		*
		* This method will examine the connection ability on given network, and query IPv4
		* and IPv6 if connection is available.
		*
		* If at least one query succeeded with valid answer, rcode will be 0
		*
		* The answer will be provided asynchronously through the provided {@link Callback}.
		*
		* @param network {@link Network} specifying which network to query on.
		* {@code null} for query on default network.
		@@ -341,13 +324,13 @@ public final class DnsResolver {
		* @param executor The {@link Executor} that the callback should be executed on.
		* @param cancellationSignal used by the caller to signal if the query should be
		* cancelled. May be {@code null}.
		* @param callback an {@link InetAddressAnswerCallback} which will be called to notify the
		* @param callback a {@link Callback} which will be called to notify the
		* caller of the result of dns query.
		*/
		public void query(@Nullable Network network, @NonNull String domain, @QueryFlag int flags,
		@NonNull @CallbackExecutor Executor executor,
		@Nullable CancellationSignal cancellationSignal,
		@NonNull InetAddressAnswerCallback callback) {
		@NonNull Callback<? super List<InetAddress>> callback) {
		if (cancellationSignal != null && cancellationSignal.isCanceled()) {
		return;
		}
		@@ -365,9 +348,7 @@ public final class DnsResolver {
		v6fd = resNetworkQuery((network != null
		? network.netId : NETID_UNSET), domain, CLASS_IN, TYPE_AAAA, flags);
		} catch (ErrnoException e) {
		executor.execute(() -> {
		callback.onQueryException(e);
		});
		executor.execute(() -> callback.onError(new DnsException(ERROR_SYSTEM, e)));
		return;
		}
		queryCount++;
		@@ -377,7 +358,9 @@ public final class DnsResolver {
		// Avoiding gateways drop packets if queries are sent too close together
		try {
		Thread.sleep(SLEEP_TIME_MS);
		} catch (InterruptedException ex) { }
		} catch (InterruptedException ex) {
		Thread.currentThread().interrupt();
		}

		if (queryIpv4) {
		try {
		@@ -385,9 +368,7 @@ public final class DnsResolver {
		? network.netId : NETID_UNSET), domain, CLASS_IN, TYPE_A, flags);
		} catch (ErrnoException e) {
		if (queryIpv6) resNetworkCancel(v6fd); // Closes fd, marks it invalid.
		executor.execute(() -> {
		callback.onQueryException(e);
		});
		executor.execute(() -> callback.onError(new DnsException(ERROR_SYSTEM, e)));
		return;
		}
		queryCount++;
		@@ -413,34 +394,89 @@ public final class DnsResolver {
		}
		}

		private <T> void registerFDListener(@NonNull Executor executor,
		@NonNull FileDescriptor queryfd, @NonNull AnswerCallback<T> answerCallback,
		/**
		* Send a DNS query with the specified name and query type, get back a set of
		* InetAddresses asynchronously.
		*
		* The answer will be provided asynchronously through the provided {@link Callback}.
		*
		* @param network {@link Network} specifying which network to query on.
		* {@code null} for query on default network.
		* @param domain domain name to query
		* @param nsType dns resource record (RR) type as one of the TYPE_* constants
		* @param flags flags as a combination of the FLAGS_* constants
		* @param executor The {@link Executor} that the callback should be executed on.
		* @param cancellationSignal used by the caller to signal if the query should be
		* cancelled. May be {@code null}.
		* @param callback a {@link Callback} which will be called to notify the caller
		* of the result of dns query.
		*/
		public void query(@Nullable Network network, @NonNull String domain,
		@QueryType int nsType, @QueryFlag int flags,
		@NonNull @CallbackExecutor Executor executor,
		@Nullable CancellationSignal cancellationSignal,
		@NonNull Callback<? super List<InetAddress>> callback) {
		if (cancellationSignal != null && cancellationSignal.isCanceled()) {
		return;
		}
		final Object lock = new Object();
		final FileDescriptor queryfd;
		try {
		queryfd = resNetworkQuery((network != null
		? network.netId : NETID_UNSET), domain, CLASS_IN, nsType, flags);
		} catch (ErrnoException e) {
		executor.execute(() -> callback.onError(new DnsException(ERROR_SYSTEM, e)));
		return;
		}
		final InetAddressAnswerAccumulator accumulator =
		new InetAddressAnswerAccumulator(1, callback);
		synchronized (lock) {
		registerFDListener(executor, queryfd, accumulator, cancellationSignal, lock);
		if (cancellationSignal == null) return;
		addCancellationSignal(cancellationSignal, queryfd, lock);
		}
		}

		/**
		* Class to retrieve DNS response
		*
		* @hide
		*/
		public static final class DnsResponse {
		public final @NonNull byte[] answerbuf;
		public final int rcode;
		public DnsResponse(@NonNull byte[] answerbuf, int rcode) {
		this.answerbuf = answerbuf;
		this.rcode = rcode;
		}
		}

		private void registerFDListener(@NonNull Executor executor,
		@NonNull FileDescriptor queryfd, @NonNull Callback<? super byte[]> answerCallback,
		@Nullable CancellationSignal cancellationSignal, @NonNull Object lock) {
		Looper.getMainLooper().getQueue().addOnFileDescriptorEventListener(
		queryfd,
		FD_EVENTS,
		(fd, events) -> {
		executor.execute(() -> {
		DnsResponse resp = null;
		ErrnoException exception = null;
		synchronized (lock) {
		if (cancellationSignal != null && cancellationSignal.isCanceled()) {
		return;
		}
		byte[] answerbuf = null;
		try {
		answerbuf = resNetworkResult(fd); // Closes fd, marks it invalid.
		resp = resNetworkResult(fd); // Closes fd, marks it invalid.
		} catch (ErrnoException e) {
		Log.e(TAG, "resNetworkResult:" + e.toString());
		answerCallback.onQueryException(e);
		return;
		exception = e;
		}

		try {
		answerCallback.onAnswer(
		answerCallback.parser.parse(answerbuf));
		} catch (ParseException e) {
		answerCallback.onParseException(e);
		}
		if (exception != null) {
		answerCallback.onError(new DnsException(ERROR_SYSTEM, exception));
		return;
		}
		answerCallback.onAnswer(resp.answerbuf, resp.rcode);
		});
		// Unregister this fd listener
		return 0;

core/java/android/net/NetworkUtils.java

+3 −2

Original line number	Diff line number	Diff line
		@@ -140,9 +140,10 @@ public class NetworkUtils {
		/**
		* DNS resolver series jni method.
		* Read a result for the query associated with the {@code fd}.
		* @return a byte array containing blob answer
		* @return DnsResponse containing blob answer and rcode
		*/
		public static native byte[] resNetworkResult(FileDescriptor fd) throws ErrnoException;
		public static native DnsResolver.DnsResponse resNetworkResult(FileDescriptor fd)
		throws ErrnoException;

		/**
		* DNS resolver series jni method.

core/java/android/net/ParseException.java

+2 −2

Original line number	Diff line number	Diff line
		@@ -25,12 +25,12 @@ import android.annotation.NonNull;
		public class ParseException extends RuntimeException {
		public String response;

		public ParseException(@NonNull String response) {
		ParseException(@NonNull String response) {
		super(response);
		this.response = response;
		}

		public ParseException(@NonNull String response, @NonNull Throwable cause) {
		ParseException(@NonNull String response, @NonNull Throwable cause) {
		super(response, cause);
		this.response = response;
		}

core/jni/android_net_NetUtils.cpp

+6 −3

File changed.

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