Add asynchronous DNS query API

Adds support for asynchronous "raw" DNS API for clients.
API allows apps to use multinetworking capability correctly
and also allows other query types than A/AAAA.

Test: built, flashed, booted
      cts test: NativeDnsAsyncTest

Change-Id: I4701b76bd8f0094ef1bdd7c5371b54387914a91b

3 files changed, 39 insertions, 2 deletions

diff --git a/native/android/libandroid.map.txt b/native/android/libandroid.map.txt
index ac5ded60bf6b..f840d5e2f968 100644
--- a/native/android/libandroid.map.txt
+++ b/native/android/libandroid.map.txt
@@ -218,6 +218,10 @@ LIBANDROID {
     android_getaddrinfofornetwork; # introduced=23
     android_setprocnetwork; # introduced=23
     android_setsocknetwork; # introduced=23
+    android_res_cancel; # introduced=29
+    android_res_nquery; # introduced=29
+    android_res_nresult; # introduced=29
+    android_res_nsend; # introduced=29
   local:
     *;
 };
diff --git a/native/android/libandroid_net.map.txt b/native/android/libandroid_net.map.txt
index 9b5a5a1f4b52..be3531da462d 100644
--- a/native/android/libandroid_net.map.txt
+++ b/native/android/libandroid_net.map.txt
@@ -1,10 +1,15 @@
-# These functions have been part of the NDK since API 24.
 # They are also all available to vendor code.
 LIBANDROID_NET {
   global:
+    # These functions have been part of the NDK since API 24.
+    android_getaddrinfofornetwork; # vndk
     android_setsocknetwork; # vndk
     android_setprocnetwork; # vndk
-    android_getaddrinfofornetwork; # vndk
+    # These functions have been part of the NDK since API 29.
+    android_res_cancel; # vndk
+    android_res_nquery; # vndk
+    android_res_nresult; # vndk
+    android_res_nsend; # vndk
   local:
     *;
 };
diff --git a/native/android/net.c b/native/android/net.c
index 60296a7bd00c..e32b7875b4e7 100644
--- a/native/android/net.c
+++ b/native/android/net.c
@@ -83,3 +83,31 @@ int android_getaddrinfofornetwork(net_handle_t network,
 
     return android_getaddrinfofornet(node, service, hints, netid, 0, res);
 }
+
+int android_res_nquery(net_handle_t network,
+        const char *dname, int ns_class, int ns_type) {
+    unsigned netid;
+    if (!getnetidfromhandle(network, &netid)) {
+        return -ENONET;
+    }
+
+    return resNetworkQuery(netid, dname, ns_class, ns_type);
+}
+
+int android_res_nresult(int fd, int *rcode, unsigned char *answer, int anslen) {
+    return resNetworkResult(fd, rcode, answer, anslen);
+}
+
+int android_res_nsend(net_handle_t network,
+        const unsigned char *msg, int msglen) {
+    unsigned netid;
+    if (!getnetidfromhandle(network, &netid)) {
+        return -ENONET;
+    }
+
+    return resNetworkSend(netid, msg, msglen);
+}
+
+void android_res_cancel(int nsend_fd) {
+    resNetworkCancel(nsend_fd);
+}