common: add --enable-ipv6only option

common/os_calls.c

@@ -479,7 +479,11 @@ g_tcp_socket(void)
     {
         if (option_value != 0)
         {
+#if defined(XRDP_ENABLE_IPV6ONLY)
+            option_value = 1;
+#else
             option_value = 0;
+#endif
             option_len = sizeof(option_value);
             if (setsockopt(rv, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&option_value,
                        option_len) < 0)

configure.ac

@@ -32,6 +32,9 @@ AM_CONDITIONAL(SESMAN_NOPAM, [test x$enable_pam != xyes])
 AC_ARG_ENABLE(ipv6, AS_HELP_STRING([--enable-ipv6],
               [Build IPv6 support (default: no, experimental)]),
               [], [enable_ipv6=no])
+AC_ARG_ENABLE(ipv6only, AS_HELP_STRING([--enable-ipv6only],
+              [Build IPv6-only (default: no)]),
+              [], [enable_ipv6only=no])
 AC_ARG_ENABLE(kerberos, AS_HELP_STRING([--enable-kerberos],
               [Build kerberos support (default: no)]),
               [], [enable_kerberos=no])
@@ -106,6 +109,12 @@ then
   fi
 fi
 
+if test "x$enable_ipv6only" = "xyes"
+then
+  enable_ipv6=yes
+  AC_DEFINE([XRDP_ENABLE_IPV6ONLY],1,[Enable IPv6 only])
+fi
+
 if test "x$enable_ipv6" = "xyes"
 then
   AC_DEFINE([XRDP_ENABLE_IPV6],1,[Enable IPv6])