Direct Sockets: Populate local_addr from options.

Below documents are from Eric Willigers <ericwilligers@chromium.org>.
Explainer: https://github.com/WICG/raw-sockets/blob/master/docs/explainer.md

Design doc:
https://docs.google.com/document/d/1Xa5nFkIWxkL3hZHvDYWPhT8sZvNeFpCUKNuqIwZHxnE/edit?usp=sharing

Bug: 905818
Change-Id: Ia6f7dd79a8b82f6ff5a33c1abab08e8320741441
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603063
Commit-Queue: Ke He <kehe@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839412}

content/browser/direct_sockets/direct_sockets_service_impl.cc

@@ -74,8 +74,8 @@ void DirectSocketsServiceImpl::OpenTcpSocket(
     return;
   }
 
-  // TODO(crbug.com/905818): Populate local_addr from options.
-  const base::Optional<net::IPEndPoint> local_addr = base::nullopt;
+  base::Optional<net::IPEndPoint> local_addr = base::nullopt;
+  PopulateLocalAddr(*options, local_addr);
 
   network::mojom::TCPConnectedSocketOptionsPtr tcp_connected_socket_options =
       network::mojom::TCPConnectedSocketOptions::New();
@@ -182,6 +182,19 @@ net::Error DirectSocketsServiceImpl::ValidateOptions(
   return net::ERR_NOT_IMPLEMENTED;
 }
 
+void DirectSocketsServiceImpl::PopulateLocalAddr(
+    const blink::mojom::DirectSocketOptions& options,
+    base::Optional<net::IPEndPoint>& local_addr) {
+  DCHECK(!local_addr);
+  if (!options.local_hostname)
+    return;
+
+  net::IPAddress local_address;
+  bool success = local_address.AssignFromIPLiteral(*options.local_hostname);
+  if (success)
+    local_addr = net::IPEndPoint(local_address, options.local_port);
+}
+
 network::mojom::NetworkContext* DirectSocketsServiceImpl::GetNetworkContext() {
   if (network::mojom::NetworkContext* network_context =
           GetNetworkContextForTesting()) {

content/browser/direct_sockets/direct_sockets_service_impl.h

@@ -71,6 +71,10 @@ class CONTENT_EXPORT DirectSocketsServiceImpl
   net::Error ValidateOptions(const blink::mojom::DirectSocketOptions& options,
                              net::IPAddress& remote_address);
 
+  // Populate |local_addr| from options.
+  void PopulateLocalAddr(const blink::mojom::DirectSocketOptions& options,
+                         base::Optional<net::IPEndPoint>& local_addr);
+
   network::mojom::NetworkContext* GetNetworkContext();
 
   RenderFrameHost* frame_host_;

content/browser/direct_sockets/direct_sockets_unittest.cc

@@ -36,6 +36,11 @@ class DirectSocketsUnitTest : public RenderViewHostTestHarness {
     return direct_sockets_service().ValidateOptions(options, remote_address);
   }
 
+  void PopulateLocalAddr(const blink::mojom::DirectSocketOptions& options,
+                         base::Optional<net::IPEndPoint>& local_addr) {
+    return direct_sockets_service().PopulateLocalAddr(options, local_addr);
+  }
+
  private:
   base::test::ScopedFeatureList feature_list_;
   std::unique_ptr<DirectSocketsServiceImpl> direct_sockets_service_;
@@ -61,4 +66,35 @@ TEST_F(DirectSocketsUnitTest, RemoteAddressCurrentlyRequired) {
   EXPECT_EQ(ValidateOptions(options), net::ERR_NAME_NOT_RESOLVED);
 }
 
+TEST_F(DirectSocketsUnitTest, PopulateLocalAddr) {
+  blink::mojom::DirectSocketOptions options;
+
+  // Test for default condition.
+  base::Optional<net::IPEndPoint> local_addr = base::nullopt;
+  PopulateLocalAddr(options, local_addr);
+  EXPECT_EQ(local_addr, base::nullopt);
+
+  // Test with IPv4 address and default port(0) provided.
+  local_addr = base::nullopt;
+  options.local_hostname = "12.34.56.78";
+  PopulateLocalAddr(options, local_addr);
+  const uint8_t ipv4[net::IPAddress::kIPv4AddressSize] = {12, 34, 56, 78};
+  EXPECT_EQ(local_addr, net::IPEndPoint(net::IPAddress(ipv4), 0));
+
+  // Test with IPv6 address and default port(0) provided.
+  local_addr = base::nullopt;
+  options.local_hostname = "fedc:ba98:7654:3210:fedc:ba98:7654:3210";
+  PopulateLocalAddr(options, local_addr);
+  const uint8_t ipv6[net::IPAddress::kIPv6AddressSize] = {
+      0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
+      0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};
+  EXPECT_EQ(local_addr, net::IPEndPoint(net::IPAddress(ipv6), 0));
+
+  // Test with IPv6 address and port(12345) provided.
+  local_addr = base::nullopt;
+  options.local_port = 12345;
+  PopulateLocalAddr(options, local_addr);
+  EXPECT_EQ(local_addr, net::IPEndPoint(net::IPAddress(ipv6), 12345));
+}
+
 }  // namespace content