autodetect ipv6

common/os_calls.c

@@ -439,7 +439,7 @@ g_tcp_socket(void)
     unsigned int option_len;
 #endif
 
-#if defined(XRDP_ENABLE_IPv6)
+#if !defined(NO_ARPA_INET_H_IP6)
     rv = (int)socket(AF_INET6, SOCK_STREAM, 0);
 #else
     rv = (int)socket(AF_INET, SOCK_STREAM, 0);
@@ -448,7 +448,7 @@ g_tcp_socket(void)
     {
         return -1;
     }
-#if defined(XRDP_ENABLE_IPv6)
+#if !defined(NO_ARPA_INET_H_IP6)
     option_len = sizeof(option_value);
     if (getsockopt(rv, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&option_value,
                    &option_len) == 0)
@@ -542,7 +542,7 @@ g_tcp_connect(int sck, const char *address, const char *port)
     * available IPv4-mapped addresses in case the target
     * host does not have a true IPv6 address:
     */
-#ifdef _XRDP_ENABLE_IPv6_
+#if !defined(NO_ARPA_INET_H_IP6)
     p.ai_flags = AI_ADDRCONFIG | AI_V4MAPPED;
     p.ai_family = AF_INET6;
 #else

configure.ac

@@ -69,6 +69,11 @@ then
   fi
 fi
 
+AC_CHECK_MEMBER([struct in6_addr.s6_addr],
+                [],
+                [AC_DEFINE(NO_ARPA_INET_H_IP6, 1, [for IPv6])],
+                [#include <arpa/inet.h>])
+
 if test "x$enable_nopam" = "xyes"
 then
   AC_DEFINE([USE_NOPAM],1,[Disable PAM])