Added new function MHD_is_feature_supported()

ChangeLog

@@ -1,3 +1,6 @@
+Sat Mar 29 16:12:03 CET 2014
+	Added MHD_is_feature_supported() function. -EG
+
 Thu Mar 27 14:47:54 CET 2014
 	Used larger FD_SETSIZE internally on W32.
 	Extended API to work with non-default FD_SETSIZE. -EG

configure.ac

@@ -491,6 +491,10 @@ AC_ARG_ENABLE([postprocessor],
 test "x$enable_postprocessor" = "xno" || enable_postprocessor=yes
 AC_MSG_RESULT([[$enable_postprocessor]])
 AM_CONDITIONAL([HAVE_POSTPROCESSOR],test "x$enable_postprocessor" != "xno")
+if test "x$enable_postprocessor" != "xno"
+then
+ AC_DEFINE([HAVE_POSTPROCESSOR],[1],[define to 1 if MHD was build with postprocessor.c])
+fi
 
 
 # optional: have zzuf, socat?

src/include/microhttpd.h

@@ -2353,6 +2353,120 @@ _MHD_EXTERN const char*
 MHD_get_version (void);
 
 
+/**
+* Types of information about MHD features,
+* used by #MHD_is_feature_supported.
+*/
+enum MHD_FEATURE
+{
+  /**
+   * Get whether messages are supported. If supported then in debug
+   * mode messages can be printed to stderr or to external logger.
+   */
+  MHD_FEATURE_MESSGES = 1,
+
+  /**
+   * Get whether HTTPS is supported.  If supported then flag
+   * #MHD_USE_SSL and options #MHD_OPTION_HTTPS_MEM_KEY,
+   * #MHD_OPTION_HTTPS_MEM_CERT, #MHD_OPTION_HTTPS_MEM_TRUST
+   * #MHD_OPTION_HTTPS_CRED_TYPE, #MHD_OPTION_HTTPS_PRIORITIES
+   * can be used.
+   */
+  MHD_FEATURE_SSL = 2,
+
+  /**
+   * Get whether option #MHD_OPTION_HTTPS_CERT_CALLBACK is
+   * supported.
+   */
+  MHD_FEATURE_HTTPS_CERT_CALLBACK = 3,
+
+  /**
+   * Get whether IPv6 is supported. If supported then flag
+   * #MHD_USE_IPv6 can be used.
+   */
+  MHD_FEATURE_IPv6 = 4,
+
+  /**
+   * Get whether IPv6 without IPv4 is supported. If not supported
+   * then IPv4 is always enabled in IPv6 sockets and
+   * flag #MHD_USE_DUAL_STACK if always used when #MHD_USE_IPv6 is
+   * specified.
+   */
+  MHD_FEATURE_IPv6_ONLY = 5,
+
+  /**
+   * Get whether `poll()` is supported. If supported then flag
+   * #MHD_USE_POLL can be used.
+   */
+  MHD_FEATURE_POLL = 6,
+
+  /**
+   * Get whether `epoll()` is supported. If supported then Flags
+   * #MHD_USE_EPOLL_LINUX_ONLY and
+   * #MHD_USE_EPOLL_INTERNALLY_LINUX_ONLY can be used.
+   */
+  MHD_FEATURE_EPOLL = 7,
+
+  /**
+   * Get whether shutdown on listen socket to signal other
+   * threads is supported. If not supported flag
+   * MHD_USE_PIPE_FOR_SHUTDOWN is automatically forced.
+   */
+  MHD_FEATURE_SHUTDOWN_LISTEN_SOCKET = 8,
+
+  /**
+   * Get whether socketpair is used internally instead of pipe to
+   * signal other threads.
+   */
+  MHD_FEATURE_SOCKETPAIR = 9,
+
+  /**
+   * Get whether TCP Fast Open is supported. If supported then
+   * flag #MHD_USE_TCP_FASTOPEN and option
+   * #MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE can be used.
+   */
+  MHD_FEATURE_TCP_FASTOPEN = 10,
+
+  /**
+   * Get whether HTTP Basic authorization is supported. If supported
+   * then functions #MHD_basic_auth_get_username_password and
+   * #MHD_queue_basic_auth_fail_response can be used.
+   */
+  MHD_FEATURE_BASIC_AUTH = 11,
+
+  /**
+   * Get whether HTTP Digest authorization is supported. If
+   * supported then options #MHD_OPTION_DIGEST_AUTH_RANDOM,
+   * #MHD_OPTION_NONCE_NC_SIZE and functions #MHD_digest_auth_check,
+   * #MHD_digest_auth_check can be used.
+   */
+  MHD_FEATURE_DIGEST_AUTH = 12,
+
+  /**
+   * Get whether postprocessor is supported. If supported then
+   * functions #MHD_create_post_processor, #MHD_post_process,
+   * #MHD_destroy_post_processor, #MHD_destroy_post_processor can
+   * be used.
+   */
+  MHD_FEATURE_POSTPROCESSOR = 13,
+};
+
+
+/**
+ * Get information about supported MHD features.
+ * Indicate that MHD was compiled with or without support for
+ * particular feature. Some features require additional support
+ * by kernel. Kernel support is not checked by this function.
+ *
+ * @param feature type of requested information
+ * @return #MHD_YES if feature is supported by MHD, #MHD_NO if
+ * feature is not supported or feature is unknown.
+ * @ingroup specialized
+ */
+_MHD_EXTERN int
+MHD_is_feature_supported(enum MHD_FEATURE feature);
+
+
 #if 0                           /* keep Emacsens' auto-indent happy */
 {
 #endif

src/microhttpd/daemon.c

@@ -4235,6 +4235,105 @@ MHD_get_version (void)
 }
 
 
+/**
+ * Get information about supported MHD features.
+ * Indicate that MHD was compiled with or without support for
+ * particular feature. Some features require additional support
+ * by kernel. Kernel support is not checked by this function.
+ *
+ * @param feature type of requested information
+ * @return #MHD_YES if feature is supported by MHD, #MHD_NO if
+ * feature is not supported or feature is unknown.
+ * @ingroup specialized
+ */
+_MHD_EXTERN int
+MHD_is_feature_supported(enum MHD_FEATURE feature)
+{
+  switch(feature)
+    {
+    case MHD_FEATURE_MESSGES:
+#if HAVE_MESSAGES
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_SSL:
+#if HTTPS_SUPPORT
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_HTTPS_CERT_CALLBACK:
+#if HTTPS_SUPPORT && GNUTLS_VERSION_MAJOR >= 3
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_IPv6:
+#ifdef HAVE_INET6
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_IPv6_ONLY:
+#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_POLL:
+#ifdef HAVE_POLL_H
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_EPOLL:
+#if EPOLL_SUPPORT
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_SHUTDOWN_LISTEN_SOCKET:
+#ifdef HAVE_LISTEN_SHUTDOWN
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_SOCKETPAIR:
+#ifdef MHD_DONT_USE_PIPES
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_TCP_FASTOPEN:
+#ifdef TCP_FASTOPEN
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_BASIC_AUTH:
+#if BAUTH_SUPPORT
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_DIGEST_AUTH:
+#if DAUTH_SUPPORT
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    case MHD_FEATURE_POSTPROCESSOR:
+#if HAVE_POSTPROCESSOR
+      return MHD_YES;
+#else
+      return MHD_NO;
+#endif
+    }
+  return MHD_NO;
+}
+
+
 #ifdef __GNUC__
 #define FUNC_CONSTRUCTOR(f) static void __attribute__ ((constructor)) f
 #define FUNC_DESTRUCTOR(f) static void __attribute__ ((destructor)) f