Add support to specify the source address for socket connect

runtime/bin/socket_win.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/builtin.h"
 #include "bin/eventhandler.h"
 #include "bin/file.h"
@@ skipping 111 matching lines @@
     return NULL;
   }
   *port = SocketAddress::GetAddrPort(&raw);
   // Clear the port before calling WSAAddressToString as WSAAddressToString
   // includes the port in the formatted string.
   SocketAddress::SetAddrPort(&raw, 0);
   return new SocketAddress(&raw.addr);
 }
 
 
-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;
   }
 
   linger l;
   l.l_onoff = 1;
   l.l_linger = 10;
   int status = setsockopt(s,
                           SOL_SOCKET,
                           SO_LINGER,
                           reinterpret_cast<char*>(&l),
                           sizeof(l));
   if (status != NO_ERROR) {
     FATAL("Failed setting SO_LINGER on socket");
   }
 
   ClientSocket* client_socket = new ClientSocket(s);
   return reinterpret_cast<intptr_t>(client_socket);
 }
 
 
-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) {
     int rc = WSAGetLastError();
     delete handle;
     closesocket(s);
     SetLastError(rc);
     return -1;
   }
 
@@ skipping 39 matching lines @@
     rc = WSAGetLastError();
   }
   handle->Close();
   delete handle;
   SetLastError(rc);
   return -1;
 }
 
 
 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;
   }
 
-  return Socket::Connect(fd, addr, port);
+  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 Connect(fd, addr, port, source_addr);
+}
+
+
 void Socket::GetError(intptr_t fd, OSError* os_error) {
   Handle* handle = reinterpret_cast<Handle*>(fd);
   os_error->SetCodeAndMessage(OSError::kSystem, handle->last_error());
 }
 
 
 int Socket::GetType(intptr_t fd) {
   Handle* handle = reinterpret_cast<Handle*>(fd);
   switch (GetFileType(handle->handle())) {
     case FILE_TYPE_CHAR: return File::kTerminal;
@@ skipping 472 matching lines @@
                     proto,
                     MCAST_LEAVE_GROUP,
                     reinterpret_cast<char *>(&mreq),
                     sizeof(mreq)) == 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)