Fixes net/asyncdispatch on Windows. Ref #2976. Fixes #2996.

lib/pure/asyncdispatch.nim

@@ -483,7 +483,7 @@ when defined(windows) or defined(nimdoc):
                   RemoteSockaddr, RemoteSockaddrLength)
 
   proc connect*(socket: AsyncFD, address: string, port: Port,
-    af = AF_INET): Future[void] =
+    af = rawsockets.AF_INET): Future[void] =
     ## Connects ``socket`` to server at ``address:port``.
     ##
     ## Returns a ``Future`` which will complete when the connection succeeds
@@ -861,7 +861,7 @@ when defined(windows) or defined(nimdoc):
     result.SocketHandle.setBlocking(false)
     register(result)
 
-  proc newAsyncRawSocket*(domain: Domain = AF_INET,
+  proc newAsyncRawSocket*(domain: Domain = rawsockets.AF_INET,
                typ: SockType = SOCK_STREAM,
                protocol: Protocol = IPPROTO_TCP): AsyncFD =
     ## Creates a new socket and registers it with the dispatcher implicitly.

lib/pure/rawsockets.nim

@@ -27,9 +27,10 @@ else:
   import posix
   export fcntl, F_GETFL, O_NONBLOCK, F_SETFL, EAGAIN, EWOULDBLOCK, MSG_NOSIGNAL,
     EINTR, EINPROGRESS, ECONNRESET, EPIPE, ENETRESET
+  export Sockaddr_storage
 
 export SocketHandle, Sockaddr_in, Addrinfo, INADDR_ANY, SockAddr, SockLen,
-  Sockaddr_in6, Sockaddr_storage,
+  Sockaddr_in6,
   inet_ntoa, recv, `==`, connect, send, accept, recvfrom, sendto
 
 export
@@ -92,6 +93,8 @@ when useWinVersion:
     IOC_IN* = int(-2147483648)
     FIONBIO* = IOC_IN.int32 or ((sizeof(int32) and IOCPARM_MASK) shl 16) or
                              (102 shl 8) or 126
+    rawAfInet = winlean.AF_INET
+    rawAfInet6 = winlean.AF_INET6
 
   proc ioctlsocket*(s: SocketHandle, cmd: clong,
                    argptr: ptr clong): cint {.
@@ -99,6 +102,8 @@ when useWinVersion:
 else:
   let
     osInvalidSocket* = posix.INVALID_SOCKET
+    rawAfInet = posix.AF_INET
+    rawAfInet6 = posix.AF_INET6
 
 proc `==`*(a, b: Port): bool {.borrow.}
   ## ``==`` for ports.
@@ -195,7 +200,7 @@ proc getAddrInfo*(address: string, port: Port, af: Domain = AF_INET, typ: SockTy
   hints.ai_family = toInt(af)
   hints.ai_socktype = toInt(typ)
   hints.ai_protocol = toInt(prot)
-  hints.ai_flags = posix.AI_V4MAPPED
+  hints.ai_flags = AI_V4MAPPED
   var gaiResult = getaddrinfo(address, $port, addr(hints), result)
   if gaiResult != 0'i32:
     when useWinVersion:
@@ -324,9 +329,9 @@ proc getSockDomain*(socket: SocketHandle): Domain =
   if getsockname(socket, cast[ptr SockAddr](addr(name)),
                  addr(namelen)) == -1'i32:
     raiseOSError(osLastError())
-  if name.sa_family == posix.AF_INET:
+  if name.sa_family == rawAfInet:
     result = AF_INET
-  elif name.sa_family == posix.AF_INET6:
+  elif name.sa_family == rawAfInet6:
     result = AF_INET6
   else:
     raise newException(OSError, "unknown socket family in getSockFamily")
@@ -334,13 +339,17 @@ proc getSockDomain*(socket: SocketHandle): Domain =
 
 proc getAddrString*(sockAddr: ptr SockAddr): string =
   ## return the string representation of address within sockAddr
-  if sockAddr.sa_family == posix.AF_INET:
+  if sockAddr.sa_family == rawAfInet:
     result = $inet_ntoa(cast[ptr Sockaddr_in](sockAddr).sin_addr)
-  elif sockAddr.sa_family == posix.AF_INET6:
+  elif sockAddr.sa_family == rawAfInet6:
+    when not useWinVersion:
+      # TODO: Windows
       var v6addr = cast[ptr Sockaddr_in6](sockAddr).sin6_addr
       result = newString(posix.INET6_ADDRSTRLEN)
-    discard posix.inet_ntop(posix.AF_INET6, addr cast[ptr Sockaddr_in6](sockAddr).sin6_addr, result.cstring, result.len.int32)
+      let addr6 = addr cast[ptr Sockaddr_in6](sockAddr).sin6_addr
-    if posix.IN6_IS_ADDR_V4MAPPED(addr cast[ptr Sockaddr_in6](sockAddr).sin6_addr) != 0:
+      discard posix.inet_ntop(posix.AF_INET6, addr6, result.cstring,
+          result.len.int32)
+      if posix.IN6_IS_ADDR_V4MAPPED(addr6) != 0:
         result = result.substr("::ffff:".len)
   else:
     raise newException(OSError, "unknown socket family in getAddrString")

lib/windows/winlean.nim

@@ -723,6 +723,9 @@ template WSAIORW*(x,y): expr = (IOC_INOUT or x or y)
 const
   SIO_GET_EXTENSION_FUNCTION_POINTER* = WSAIORW(IOC_WS2,6).DWORD
   SO_UPDATE_ACCEPT_CONTEXT* = 0x700B
+  AI_V4MAPPED* = 0x0008
+  AF_INET* = 2
+  AF_INET6* = 23
 
 var
   WSAID_CONNECTEX*: GUID = GUID(D1: 0x25a207b9, D2: 0xddf3'i16, D3: 0x4660, D4: [