Port Socket::Addrinfo to win32

spec/std/socket/addrinfo_spec.cr

@@ -1,5 +1,5 @@
 require "spec"
-require "socket"
+require "socket/addrinfo"
 
 describe Socket::Addrinfo do
   describe ".resolve" do

spec/win32_std_spec.cr

@@ -182,7 +182,7 @@ require "./std/set_spec.cr"
 # require "./std/signal_spec.cr" (failed codegen)
 require "./std/slice_spec.cr"
 require "./std/socket/address_spec.cr"
-# require "./std/socket/addrinfo_spec.cr" (failed codegen)
+require "./std/socket/addrinfo_spec.cr"
 # require "./std/socket/socket_spec.cr" (failed codegen)
 # require "./std/socket/tcp_server_spec.cr" (failed codegen)
 # require "./std/socket/tcp_socket_spec.cr" (failed codegen)

src/lib_c/x86_64-windows-msvc/c/winbase.cr

@@ -12,6 +12,7 @@ lib LibC
   FORMAT_MESSAGE_FROM_HMODULE    = 0x00000800_u32
   FORMAT_MESSAGE_FROM_SYSTEM     = 0x00001000_u32
   FORMAT_MESSAGE_ARGUMENT_ARRAY  = 0x00002000_u32
+  FORMAT_MESSAGE_MAX_WIDTH_MASK  = 0x000000FF_u32
 
   fun FormatMessageW(dwFlags : DWORD, lpSource : Void*, dwMessageId : DWORD, dwLanguageId : DWORD,
                      lpBuffer : LPWSTR, nSize : DWORD, arguments : Void*) : DWORD

src/lib_c/x86_64-windows-msvc/c/winsock2.cr

@@ -12,10 +12,27 @@ lib LibC
   AF_IRDA      = 26
   AF_BTH       = 32
 
+  SOCK_STREAM    = 1
+  SOCK_DGRAM     = 2
+  SOCK_RAW       = 3
+  SOCK_RDM       = 4
+  SOCK_SEQPACKET = 5
+
   struct InAddr
     s_addr : UInt32
   end
 
+  struct WSAData
+    wVersion : WORD
+    wHighVersion : WORD
+    szDescription : Char[257]
+    szSystemStatus : Char[129]
+    iMaxSockets : UInt16
+    iMaxUdpDg : UInt16
+    lpVendorInfo : Char*
+  end
+
   fun htons(hostshort : UShort) : UShort
   fun ntohs(netshort : UShort) : UShort
+  fun WSAStartup(wVersionRequired : WORD, lpWSAData : WSAData*) : Int
 end

src/lib_c/x86_64-windows-msvc/c/ws2def.cr

@@ -7,8 +7,32 @@ lib LibC
   IPPROTO_ICMPV6 =  58
   IPPROTO_RAW    = 255
 
+  AI_PASSIVE                =     0x0001
+  AI_CANONNAME              =     0x0002
+  AI_NUMERICHOST            =     0x0004
+  AI_ALL                    =     0x0100
+  AI_ADDRCONFIG             =     0x0400
+  AI_V4MAPPED               =     0x0800
+  AI_NON_AUTHORITATIVE      =    0x04000
+  AI_SECURE                 =    0x08000
+  AI_RETURN_PREFERRED_NAMES =   0x010000
+  AI_FQDN                   = 0x00020000
+  AI_FILESERVER             = 0x00040000
+  AI_NUMERICSERV            = 0x00000008
+
   struct Sockaddr
     sa_family : UInt8
     sa_data : Char[14]
   end
+
+  struct Addrinfo
+    ai_flags : Int
+    ai_family : Int
+    ai_socktype : Int
+    ai_protocol : Int
+    ai_addrlen : SizeT
+    ai_canonname : Char*
+    ai_addr : Sockaddr*
+    ai_next : Addrinfo*
+  end
 end

src/lib_c/x86_64-windows-msvc/c/ws2tcpip.cr

@@ -2,6 +2,19 @@ require "./winsock2"
 require "./ws2ipdef"
 
 lib LibC
+  EAI_AGAIN        = WinError::WSATRY_AGAIN
+  EAI_BADFLAGS     = WinError::WSAEINVAL
+  EAI_FAIL         = WinError::WSANO_RECOVERY
+  EAI_FAMILY       = WinError::WSAEAFNOSUPPORT
+  EAI_MEMORY       = WinError::WSA_NOT_ENOUGH_MEMORY
+  EAI_NOSECURENAME = WinError::WSA_SECURE_HOST_NOT_FOUND
+  EAI_NONAME       = WinError::WSAHOST_NOT_FOUND
+  EAI_SERVICE      = WinError::WSATYPE_NOT_FOUND
+  EAI_SOCKTYPE     = WinError::WSAESOCKTNOSUPPORT
+  EAI_IPSECPOLICY  = WinError::WSA_IPSEC_NAME_POLICY_ERROR
+
+  fun freeaddrinfo(pAddrInfo : Addrinfo*) : Void
+  fun getaddrinfo(pNodeName : Char*, pServiceName : Char*, pHints : Addrinfo*, ppResult : Addrinfo**) : Int
   fun inet_ntop(family : Int, pAddr : Void*, pStringBuf : Char*, stringBufSize : SizeT) : Char*
   fun inet_pton(family : Int, pszAddrString : Char*, pAddrBuf : Void*) : Int
 end

src/socket.cr

@@ -8,13 +8,6 @@ class Socket < IO
   include IO::Buffered
   include IO::Evented
 
-  enum Type
-    STREAM    = LibC::SOCK_STREAM
-    DGRAM     = LibC::SOCK_DGRAM
-    RAW       = LibC::SOCK_RAW
-    SEQPACKET = LibC::SOCK_SEQPACKET
-  end
-
   # :nodoc:
   SOMAXCONN = 128
 

src/socket/addrinfo.cr

@@ -1,4 +1,5 @@
 require "uri/punycode"
+require "./address"
 
 class Socket
   # Domain name resolver.
@@ -83,12 +84,22 @@ class Socket
       getter error_code : Int32
 
       def self.new(error_code, domain)
-        new error_code, String.new(LibC.gai_strerror(error_code)), domain
+        new error_code, error_string(error_code), domain
       end
 
       def initialize(@error_code, message, domain)
         super("Hostname lookup for #{domain} failed: #{message}")
       end
+
+      def self.error_string(error_code)
+        {% if flag?(:win32) %}
+          # gai_strerror is defined as a macro in WS2tcpip.h, we can just use
+          # WinError for this
+          return WinError.new(error_code.to_u32).message
+        {% else %}
+          String.new(LibC.gai_strerror(error_code))
+        {% end %}
+      end
     end
 
     private def self.getaddrinfo(domain, service, family, type, protocol, timeout)

src/socket/common.cr

@@ -8,6 +8,21 @@
 {% end %}
 
 class Socket
+  {% if flag?(:win32) %}
+    begin
+      # Initialize Windows Socket API and expect version 2.2
+      wsa_version = 0x202
+      err = LibC.WSAStartup(wsa_version, out wsadata)
+      unless err.zero?
+        raise IO::Error.from_winerror("WSAStartup", WinError.new(err.to_u32))
+      end
+
+      if wsadata.wVersion != wsa_version
+        raise IO::Error.new("Unsuitable version of the Windows Socket API: 0x#{wsadata.wVersion.to_s(16)}")
+      end
+    end
+  {% end %}
+
   enum Protocol
     IP   = LibC::IPPROTO_IP
     TCP  = LibC::IPPROTO_TCP
@@ -30,6 +45,13 @@ class Socket
     INET6  = LibC::AF_INET6
   end
 
+  enum Type
+    STREAM    = LibC::SOCK_STREAM
+    DGRAM     = LibC::SOCK_DGRAM
+    RAW       = LibC::SOCK_RAW
+    SEQPACKET = LibC::SOCK_SEQPACKET
+  end
+
   class Error < IO::Error
     private def self.new_from_errno(message, errno, **opts)
       case errno