commit b787e26369eb8ed417e7a80a4fbe82847980f32a
author Sameer Vijaykar <samvi@google.com> Thu Aug 11 09:52:57 2022
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Aug 11 13:52:53 2022
tree 771a2e5bf10be2aa816ba9a50ba3fd5faf19b6c1
parent 12053ec64ad71dde3b1603296f7df50ae93e68a7

Support DNS resolution matching a specified IP family.

The input SocketAddress for STUN host lookup is constructed with just
the hostname, so the family is AF_UNSPEC. So added an overload with a
target family to distinguish this from the family of the input addr.

Bug: webrtc:14319, webrtc:14131
Change-Id: Ia5ac5aa2e894e0c4dfb4417e3e8a76a6cec3ea71
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/270624
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Sameer Vijaykar <samvi@google.com>
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Jonas Oreland <jonaso@google.com>
Cr-Commit-Position: refs/heads/main@{#37750}

api/async_dns_resolver.h

diff --git a/api/async_dns_resolver.h b/api/async_dns_resolver.h
index 138503b..82d80de 100644
--- a/api/async_dns_resolver.h
+++ b/api/async_dns_resolver.h
@@ -14,6 +14,7 @@
 #include <functional>
 #include <memory>
 
+#include "rtc_base/checks.h"
 #include "rtc_base/socket_address.h"
 #include "rtc_base/system/rtc_export.h"
 
@@ -63,6 +64,10 @@
   // Start address resolution of the hostname in `addr`.
   virtual void Start(const rtc::SocketAddress& addr,
                      std::function<void()> callback) = 0;
+  // Start address resolution of the hostname in `addr` matching `family`.
+  virtual void Start(const rtc::SocketAddress& addr,
+                     int family,
+                     std::function<void()> callback) = 0;
   virtual const AsyncDnsResolverResult& result() const = 0;
 };
 
@@ -79,6 +84,14 @@
   virtual std::unique_ptr<webrtc::AsyncDnsResolverInterface> CreateAndResolve(
       const rtc::SocketAddress& addr,
       std::function<void()> callback) = 0;
+  // Creates an AsyncDnsResolver and starts resolving the name to an address
+  // matching the specified family. The callback will be called when resolution
+  // is finished. The callback will be called on the sequence that the caller
+  // runs on.
+  virtual std::unique_ptr<webrtc::AsyncDnsResolverInterface> CreateAndResolve(
+      const rtc::SocketAddress& addr,
+      int family,
+      std::function<void()> callback) = 0;
   // Creates an AsyncDnsResolver and does not start it.
   // For backwards compatibility, will be deprecated and removed.
   // One has to do a separate Start() call on the