Add support to specify the source address for socket connect

runtime/bin/socket_win.cc

Index: runtime/bin/socket_win.cc
diff --git a/runtime/bin/socket_win.cc b/runtime/bin/socket_win.cc
index 346c7b120d47d33209b379761538f92d96231cdb..7a640cdad4cf8f9f0dbd9577de2dda65a921dd4e 100644
--- a/runtime/bin/socket_win.cc
+++ b/runtime/bin/socket_win.cc
@@ -129,7 +129,7 @@ SocketAddress* Socket::GetRemotePeer(intptr_t fd, intptr_t* port) {
 }
 
 
-intptr_t Socket::Create(RawAddr addr) {
+static intptr_t Create(RawAddr addr) {
   SOCKET s = socket(addr.ss.ss_family, SOCK_STREAM, 0);
   if (s == INVALID_SOCKET) {
     return -1;
@@ -152,19 +152,12 @@ intptr_t Socket::Create(RawAddr addr) {
 }
 
 
-intptr_t Socket::Connect(intptr_t fd, RawAddr addr, const intptr_t port) {
+static intptr_t Connect(
+    intptr_t fd, RawAddr addr, const intptr_t port, RawAddr bind_addr) {
   ASSERT(reinterpret_cast<Handle*>(fd)->is_client_socket());
   ClientSocket* handle = reinterpret_cast<ClientSocket*>(fd);
   SOCKET s = handle->socket();
 
-  RawAddr bind_addr;
-  memset(&bind_addr, 0, sizeof(bind_addr));
-  bind_addr.ss.ss_family = addr.ss.ss_family;
-  if (addr.ss.ss_family == AF_INET) {
-    bind_addr.in.sin_addr.s_addr = INADDR_ANY;
-  } else {
-    bind_addr.in6.sin6_addr = in6addr_any;
-  }
   int status = bind(
       s, &bind_addr.addr, SocketAddress::GetAddrLength(&bind_addr));
   if (status != NO_ERROR) {
@@ -224,12 +217,33 @@ intptr_t Socket::Connect(intptr_t fd, RawAddr addr, const intptr_t port) {
 
 
 intptr_t Socket::CreateConnect(RawAddr addr, const intptr_t port) {
-  intptr_t fd = Socket::Create(addr);
+  intptr_t fd = Create(addr);
+  if (fd < 0) {
+    return fd;
+  }
+
+  RawAddr bind_addr;
+  memset(&bind_addr, 0, sizeof(bind_addr));
+  bind_addr.ss.ss_family = addr.ss.ss_family;
+  if (addr.ss.ss_family == AF_INET) {
+    bind_addr.in.sin_addr.s_addr = INADDR_ANY;
+  } else {
+    bind_addr.in6.sin6_addr = in6addr_any;
+  }
+
+  return Connect(fd, addr, port, bind_addr);
+}
+
+
+intptr_t Socket::CreateBindConnect(RawAddr addr,
+                                   const intptr_t port,
+                                   RawAddr source_addr) {
+  intptr_t fd = Create(addr);
   if (fd < 0) {
     return fd;
   }
 
-  return Socket::Connect(fd, addr, port);
+  return Connect(fd, addr, port, source_addr);
 }