[PATCH] ws2_32: Very minimal support for AF_UNIX.

[Richard W.M. Jones]

This is the most minimal support for AF_UNIX.  Windows 10 has had
AF_UNIX support for a while:
https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/

Signed-off-by: Richard W.M. Jones 
---
 dlls/ws2_32/socket.c | 34 ++++++++++++++++++++++++++++++++++
 include/Makefile.in  |  1 +
 include/afunix.h     | 43 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)

diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index 4d2afa946b..a42fe0e7a8 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -132,6 +132,8 @@
 # include <sys/time.h>
 #endif

+#include <sys/un.h>
+
 #define NONAMELESSUNION
 #define NONAMELESSSTRUCT
 #include "ntstatus.h"
@@ -151,6 +153,7 @@
 #include "wshisotp.h"
 #include "mstcpip.h"
 #include "af_irda.h"
+#include "afunix.h"
 #include "winnt.h"
 #define USE_WC_PREFIX   /* For CMSG_DATA */
 #include "iphlpapi.h"
@@ -745,6 +748,7 @@ static const int ws_ipv6_map[][2] =
 static const int ws_af_map[][2] =
 {
     MAP_OPTION( AF_UNSPEC ),
+    MAP_OPTION( AF_UNIX ),
     MAP_OPTION( AF_INET ),
     MAP_OPTION( AF_INET6 ),
 #ifdef HAS_IPX
@@ -1802,6 +1806,7 @@ static inline BOOL supported_pf(int pf)
 {
     switch (pf)
     {
+    case WS_AF_UNIX:
     case WS_AF_INET:
     case WS_AF_INET6:
         return TRUE;
@@ -1900,6 +1905,18 @@ static unsigned int ws_sockaddr_ws2u(const struct WS_sockaddr* wsaddr, int wsadd
         memcpy(&uin->sin_addr,&win->sin_addr,4); /* 4 bytes = 32 address bits */
         break;
     }
+    case WS_AF_UNIX: {
+        struct sockaddr_un* un = (struct sockaddr_un *)uaddr;
+        const struct WS_sockaddr_un* wun = (const struct WS_sockaddr_un*)wsaddr;
+
+        if (wsaddrlen<sizeof(struct WS_sockaddr_un))
+            return 0;
+        uaddrlen = sizeof(struct sockaddr_un);
+        memset( uaddr, 0, uaddrlen );
+        un->sun_family = AF_UNIX;
+        memcpy(&un->sun_path, &wun->sun_path, __WINE_UNIX_PATH_MAX);
+        break;
+    }
 #ifdef HAS_IRDA
     case WS_AF_IRDA: {
         struct sockaddr_irda *uin = (struct sockaddr_irda *)uaddr;
@@ -1984,6 +2001,12 @@ static BOOL is_sockaddr_bound(const struct sockaddr *uaddr, int uaddrlen)
             const struct sockaddr_in *in = (const struct sockaddr_in*) uaddr;
             return in->sin_port || memcmp(&in->sin_addr, &emptyAddr.sin_addr, sizeof(struct in_addr));
         }
+        case AF_UNIX:
+        {
+            static const struct sockaddr_un emptyAddr;
+            const struct sockaddr_un *un = (const struct sockaddr_un*) uaddr;
+            return memcmp(&un->sun_path, &emptyAddr.sun_path, __WINE_UNIX_PATH_MAX);
+        }
         case AF_UNSPEC:
             return FALSE;
         default:
@@ -2108,6 +2131,17 @@ static int ws_sockaddr_u2ws(const struct sockaddr* uaddr, struct WS_sockaddr* ws
         *wsaddrlen = sizeof(struct WS_sockaddr_in);
         return 0;
     }
+    case AF_UNIX: {
+        const struct sockaddr_un* un = (const struct sockaddr_un*)uaddr;
+        struct WS_sockaddr_un* wun = (struct WS_sockaddr_un*)wsaddr;
+
+        if (*wsaddrlen < sizeof(struct WS_sockaddr_un))
+            return -1;
+        wun->sun_family = WS_AF_INET;
+        memcpy(&wun->sun_path, &un->sun_path, __WINE_UNIX_PATH_MAX);
+        *wsaddrlen = sizeof(struct WS_sockaddr_un);
+        return 0;
+    }
     case AF_UNSPEC: {
         memset(wsaddr,0,*wsaddrlen);
         return 0;
diff --git a/include/Makefile.in b/include/Makefile.in
index 49b174ed31..3513b88c23 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -11,6 +11,7 @@ SOURCES = \
    adshlp.h \
    advpub.h \
    af_irda.h \
+	afunix.h \
    amaudio.h \
    amsi.idl \
    amstream.idl \
diff --git a/include/afunix.h b/include/afunix.h
new file mode 100644
index 0000000000..4266e5f84b
--- /dev/null
+++ b/include/afunix.h
@@ -0,0 +1,43 @@
+/* AFUNIX.H
+ *
+ * Copyright (C) the Wine project
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifndef __WINE_AFUNIX_H
+#define __WINE_AFUNIX_H
+
+#define __WINE_UNIX_PATH_MAX 108
+
+#ifdef USE_WS_PREFIX
+
+struct WS_sockaddr_un
+{
+  ADDRESS_FAMILY sun_family;
+  char sun_path[__WINE_UNIX_PATH_MAX];
+};
+
+#else
+
+struct sockaddr_un
+{
+  ADDRESS_FAMILY sun_family;
+  char sun_path[__WINE_UNIX_PATH_MAX];
+};
+
+#endif
+
+#endif /* __WINE_AFUNIX_H */