From fa9bedd47cf8c143e801889c78f0a0979ac4d2fc Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Tue, 15 Sep 2009 00:24:31 +0200
Subject: [PATCH] Allow compiling for Windows XP and higher.

This allows us to use getaddrinfo(), getnameinfo() and related functions, which
allow tinc to make connections over existing IPv6 networks. These functions are
not available on Windows 2000 however. By default, support is enabled, but when
compiling for Windows 2000 the configure switch --with-windows2000 should be
used.

Since getaddrinfo() et al. are not functions but macros on Windows, we have to
use AC_CHECK_DECLS() instead of AC_CHECK_FUNCS() in configure.in.
---
 configure.in           |  7 ++++++-
 have.h                 | 16 +++++++++++-----
 lib/dropin.h           |  5 -----
 lib/fake-getaddrinfo.c |  6 +++---
 lib/fake-getaddrinfo.h |  6 +++---
 lib/fake-getnameinfo.c |  2 +-
 lib/fake-getnameinfo.h |  2 +-
 7 files changed, 25 insertions(+), 19 deletions(-)

diff --git a/configure.in b/configure.in
index eff93a0..1ff36b3 100644
--- a/configure.in
+++ b/configure.in
@@ -82,6 +82,11 @@ AC_ARG_ENABLE(tunemu,
   ]
 )
 
+AC_ARG_WITH(windows2000,
+  AS_HELP_STRING([--with-windows2000], [compile with support for Windows 2000. This disables support for tunneling over existing IPv6 networks.]),
+  [AC_DEFINE(WITH_WINDOWS2000, 1, [Compile with support for Windows 2000])]
+)
+
 AM_CONDITIONAL(TUNEMU, test "$tunemu" = true)
 
 AC_CACHE_SAVE
@@ -143,7 +148,7 @@ AC_CHECK_FUNC(gethostbyname, [], [
   AC_CHECK_LIB(nsl, gethostbyname)
 ])
 
-AC_CHECK_FUNCS([freeaddrinfo gai_strerror getaddrinfo getnameinfo inet_aton],
+AC_CHECK_DECLS([freeaddrinfo, gai_strerror, getaddrinfo, getnameinfo],
   [], [], [#include "have.h"]
 )
 
diff --git a/have.h b/have.h
index 8a58af3..7e2930d 100644
--- a/have.h
+++ b/have.h
@@ -31,6 +31,17 @@
 #include <fcntl.h>
 #include <unistd.h>
 
+#ifdef HAVE_MINGW
+#ifdef WITH_WINDOWS2000
+#define WINVER Windows2000
+#else
+#define WINVER WindowsXP
+#endif
+#include <w32api.h>
+#include <windows.h>
+#include <ws2tcpip.h>
+#endif
+
 #ifdef HAVE_STDBOOL_H
 #include <stdbool.h>
 #endif
@@ -160,9 +171,4 @@
 #include <netinet/if_ether.h>
 #endif
 
-#ifdef HAVE_MINGW
-#include <windows.h>
-#include <winsock2.h>
-#endif
-
 #endif /* __TINC_SYSTEM_H__ */
diff --git a/lib/dropin.h b/lib/dropin.h
index 72109c8..4db7d7e 100644
--- a/lib/dropin.h
+++ b/lib/dropin.h
@@ -39,11 +39,6 @@ extern int asprintf(char **, const char *, ...);
 extern int vasprintf(char **, const char *, va_list ap);
 #endif
 
-#ifndef HAVE_GETNAMEINFO
-extern int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
-					   size_t hostlen, char *serv, size_t servlen, int flags);
-#endif
-
 #ifndef HAVE_GETTIMEOFDAY
 extern int gettimeofday(struct timeval *, void *);
 #endif
diff --git a/lib/fake-getaddrinfo.c b/lib/fake-getaddrinfo.c
index 14420b5..10672b7 100644
--- a/lib/fake-getaddrinfo.c
+++ b/lib/fake-getaddrinfo.c
@@ -16,7 +16,7 @@
 #include "fake-getaddrinfo.h"
 #include "xalloc.h"
 
-#ifndef HAVE_GAI_STRERROR
+#if !HAVE_DECL_GAI_STRERROR
 char *gai_strerror(int ecode)
 {
 	switch (ecode) {
@@ -32,7 +32,7 @@ char *gai_strerror(int ecode)
 }    
 #endif /* !HAVE_GAI_STRERROR */
 
-#ifndef HAVE_FREEADDRINFO
+#if !HAVE_DECL_FREEADDRINFO
 void freeaddrinfo(struct addrinfo *ai)
 {
 	struct addrinfo *next;
@@ -45,7 +45,7 @@ void freeaddrinfo(struct addrinfo *ai)
 }
 #endif /* !HAVE_FREEADDRINFO */
 
-#ifndef HAVE_GETADDRINFO
+#if !HAVE_DECL_GETADDRINFO
 static struct addrinfo *malloc_ai(uint16_t port, uint32_t addr)
 {
 	struct addrinfo *ai;
diff --git a/lib/fake-getaddrinfo.h b/lib/fake-getaddrinfo.h
index d2b46f6..d31a89a 100644
--- a/lib/fake-getaddrinfo.h
+++ b/lib/fake-getaddrinfo.h
@@ -33,16 +33,16 @@ struct addrinfo {
 };
 #endif /* !HAVE_STRUCT_ADDRINFO */
 
-#ifndef HAVE_GETADDRINFO
+#if !HAVE_DECL_GETADDRINFO
 int getaddrinfo(const char *hostname, const char *servname, 
                 const struct addrinfo *hints, struct addrinfo **res);
 #endif /* !HAVE_GETADDRINFO */
 
-#ifndef HAVE_GAI_STRERROR
+#if !HAVE_DECL_GAI_STRERROR
 char *gai_strerror(int ecode);
 #endif /* !HAVE_GAI_STRERROR */
 
-#ifndef HAVE_FREEADDRINFO
+#if !HAVE_DECL_FREEADDRINFO
 void freeaddrinfo(struct addrinfo *ai);
 #endif /* !HAVE_FREEADDRINFO */
 
diff --git a/lib/fake-getnameinfo.c b/lib/fake-getnameinfo.c
index 796efdf..8047173 100644
--- a/lib/fake-getnameinfo.c
+++ b/lib/fake-getnameinfo.c
@@ -14,7 +14,7 @@
 #include "fake-getnameinfo.h"
 #include "fake-getaddrinfo.h"
 
-#ifndef HAVE_GETNAMEINFO
+#if !HAVE_DECL_GETNAMEINFO
 
 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
 {
diff --git a/lib/fake-getnameinfo.h b/lib/fake-getnameinfo.h
index 0f0b4bc..02ac77a 100644
--- a/lib/fake-getnameinfo.h
+++ b/lib/fake-getnameinfo.h
@@ -3,7 +3,7 @@
 #ifndef _FAKE_GETNAMEINFO_H
 #define _FAKE_GETNAMEINFO_H
 
-#ifndef HAVE_GETNAMEINFO
+#if !HAVE_DECL_GETNAMEINFO
 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, 
                 size_t hostlen, char *serv, size_t servlen, int flags);
 #endif /* !HAVE_GETNAMEINFO */
-- 
2.25.1