Support strange certificate + passsword authentication types

17 files changed, 179 insertions, 90 deletions

diff --git a/openvpn/src/compat/Makefile.am b/openvpn/src/compat/Makefile.am
index 5ee35f7..7ad4452 100644
--- a/openvpn/src/compat/Makefile.am
+++ b/openvpn/src/compat/Makefile.am
@@ -20,6 +20,7 @@ noinst_LTLIBRARIES = libcompat.la
 
 libcompat_la_SOURCES = \
 	compat.h \
+	compat-stdbool.h \
 	compat-dirname.c \
 	compat-basename.c \
 	compat-gettimeofday.c \
diff --git a/openvpn/src/openvpn/basic.h b/openvpn/src/openvpn/basic.h
index 7c13e22..298cf10 100644
--- a/openvpn/src/openvpn/basic.h
+++ b/openvpn/src/openvpn/basic.h
@@ -25,19 +25,6 @@
 #ifndef BASIC_H
 #define BASIC_H
 
-/* bool definitions */
-#ifndef bool
-#define bool int
-#endif
-
-#ifndef true
-#define true 1
-#endif
-
-#ifndef false
-#define false 0
-#endif
-
 #define BOOL_CAST(x) ((x) ? (true) : (false))
 
 /* size of an array */
diff --git a/openvpn/src/openvpn/crypto_polarssl.c b/openvpn/src/openvpn/crypto_polarssl.c
index 0e6728c..3978a3c 100644
--- a/openvpn/src/openvpn/crypto_polarssl.c
+++ b/openvpn/src/openvpn/crypto_polarssl.c
@@ -42,12 +42,16 @@
 #include "buffer.h"
 #include "integer.h"
 #include "crypto_backend.h"
+#include "otime.h"
+#include "misc.h"
 
 #include <polarssl/des.h>
 #include <polarssl/md5.h>
 #include <polarssl/cipher.h>
 #include <polarssl/havege.h>
 
+#include <polarssl/entropy.h>
+
 /*
  *
  * Hardware engine support. Allows loading/unloading of engines.
@@ -149,7 +153,6 @@ show_available_engines ()
       "available\n");
 }
 
-
 /*
  *
  * Random number functions, used in cases where we want
@@ -159,29 +162,65 @@ show_available_engines ()
  *
  */
 
-int
-rand_bytes (uint8_t *output, int len)
+/*
+ * Initialise the given ctr_drbg context, using a personalisation string and an
+ * entropy gathering function.
+ */
+ctr_drbg_context * rand_ctx_get()
 {
-  static havege_state hs = {0};
-  static bool hs_initialised = false;
-  const int int_size = sizeof(int);
+  static entropy_context ec = {0};
+  static ctr_drbg_context cd_ctx = {0};
+  static bool rand_initialised = false;
 
-  if (!hs_initialised)
+  if (!rand_initialised)
     {
-      /* Initialise PolarSSL RNG */
-      havege_init(&hs);
-      hs_initialised = true;
-    }
+      struct gc_arena gc = gc_new();
+      struct buffer pers_string = alloc_buf_gc(100, &gc);
+
+      /*
+       * Personalisation string, should be as unique as possible (see NIST
+       * 800-90 section 8.7.1). We have very little information at this stage.
+       * Include Program Name, memory address of the context and PID.
+       */
+      buf_printf(&pers_string, "OpenVPN %0u %p %s", platform_getpid(), &cd_ctx, time_string(0, 0, 0, &gc));
+
+      /* Initialise PolarSSL RNG, and built-in entropy sources */
+      entropy_init(&ec);
+
+      if (0 != ctr_drbg_init(&cd_ctx, entropy_func, &ec, BPTR(&pers_string), BLEN(&pers_string)))
+        msg (M_FATAL, "Failed to initialize random generator");
+
+      gc_free(&gc);
+      rand_initialised = true;
+  }
+
+  return &cd_ctx;
+}
+
+#ifdef ENABLE_PREDICTION_RESISTANCE
+void rand_ctx_enable_prediction_resistance()
+{
+  ctr_drbg_context *cd_ctx = rand_ctx_get();
+
+  ctr_drbg_set_prediction_resistance(cd_ctx, 1);
+}
+#endif /* ENABLE_PREDICTION_RESISTANCE */
+
+int
+rand_bytes (uint8_t *output, int len)
+{
+  ctr_drbg_context *rng_ctx = rand_ctx_get();
 
   while (len > 0)
     {
-      const int blen 	= min_int (len, int_size);
-      const int rand_int 	= havege_rand(&hs);
+      const size_t blen = min_int (len, CTR_DRBG_MAX_REQUEST);
+      if (0 != ctr_drbg_random(rng_ctx, output, blen))
+	return 0;
 
-      memcpy (output, &rand_int, blen);
       output += blen;
       len -= blen;
     }
+
   return 1;
 }
 
diff --git a/openvpn/src/openvpn/crypto_polarssl.h b/openvpn/src/openvpn/crypto_polarssl.h
index 358483a..bfabb91 100644
--- a/openvpn/src/openvpn/crypto_polarssl.h
+++ b/openvpn/src/openvpn/crypto_polarssl.h
@@ -30,8 +30,10 @@
 #ifndef CRYPTO_POLARSSL_H_
 #define CRYPTO_POLARSSL_H_
 
+#include <polarssl/version.h>
 #include <polarssl/cipher.h>
 #include <polarssl/md.h>
+#include <polarssl/ctr_drbg.h>
 
 /** Generic cipher key type %context. */
 typedef cipher_info_t cipher_kt_t;
@@ -71,4 +73,23 @@ typedef md_context_t hmac_ctx_t;
 #define SHA_DIGEST_LENGTH 	20
 #define DES_KEY_LENGTH 8
 
+/**
+ * Returns a singleton instance of the PolarSSL random number generator.
+ *
+ * For PolarSSL 1.1+, this is the CTR_DRBG random number generator. If it
+ * hasn't been initialised yet, the RNG will be initialised using the default
+ * entropy sources. Aside from the default platform entropy sources, an
+ * additional entropy source, the HAVEGE random number generator will also be
+ * added. During initialisation, a personalisation string will be added based
+ * on the time, the PID, and a pointer to the random context.
+ */
+ctr_drbg_context * rand_ctx_get();
+
+#ifdef ENABLE_PREDICTION_RESISTANCE
+/**
+ * Enable prediction resistance on the random number generator.
+ */
+void rand_ctx_enable_prediction_resistance();
+#endif
+
 #endif /* CRYPTO_POLARSSL_H_ */
diff --git a/openvpn/src/openvpn/init.c b/openvpn/src/openvpn/init.c
index 88d621a..cc94b81 100644
--- a/openvpn/src/openvpn/init.c
+++ b/openvpn/src/openvpn/init.c
@@ -954,7 +954,7 @@ do_genkey (const struct options * options)
 bool
 do_persist_tuntap (const struct options *options)
 {
-#ifdef TUNSETPERSIST
+#ifdef ENABLE_FEATURE_TUN_PERSIST
   if (options->persist_config)
     {
       /* sanity check on options for --mktun or --rmtun */
@@ -2016,6 +2016,12 @@ init_crypto_pre (struct context *c, const unsigned int flags)
 
   if (c->options.mute_replay_warnings)
     c->c2.crypto_options.flags |= CO_MUTE_REPLAY_WARNINGS;
+
+#ifdef ENABLE_PREDICTION_RESISTANCE
+  if (c->options.use_prediction_resistance)
+    rand_ctx_enable_prediction_resistance();
+#endif
+
 }
 
 /*
diff --git a/openvpn/src/openvpn/jniglue.c b/openvpn/src/openvpn/jniglue.c
index 686092b..c0fff12 100644
--- a/openvpn/src/openvpn/jniglue.c
+++ b/openvpn/src/openvpn/jniglue.c
@@ -129,13 +129,6 @@ void android_openvpn_log(int level,const char* prefix,const char* prefix_sep,con
     
 }
 
-
-unsigned char android_protect_socket(int sockfd) {
-    jmethodID aMethodID = (*openvpnjenv)->GetStaticMethodID(openvpnjenv, openvpnclass, "protectSocket", 
-                                                            "(I)Z");
-    return (*openvpnjenv)->CallStaticBooleanMethod(openvpnjenv,openvpnclass,aMethodID,sockfd);
-
-}
 int android_open_tun () {
     jmethodID aMethodID = (*openvpnjenv)->GetStaticMethodID(openvpnjenv, openvpnclass, "openTunDevice", 
                                                             "()I");
diff --git a/openvpn/src/openvpn/manage.c b/openvpn/src/openvpn/manage.c
index 1a6c086..1dddd41 100644
--- a/openvpn/src/openvpn/manage.c
+++ b/openvpn/src/openvpn/manage.c
@@ -1479,14 +1479,13 @@ man_new_connection_post (struct management *man, const char *description)
 #if UNIX_SOCK_SUPPORT
   if (man->settings.flags & MF_UNIX_SOCK)
     {
-        msg (D_MANAGEMENT, "MANAGEMENT(unix): %s %s",
-             description,
-             sockaddr_unix_name (&man->settings.local_unix, "NULL"));
- 
+      msg (D_MANAGEMENT, "MANAGEMENT: %s %s",
+	   description,
+	   sockaddr_unix_name (&man->settings.local_unix, "NULL"));
     }
   else
 #endif
-    msg (D_MANAGEMENT, "MANAGEMENT(tcp): %s %s",
+    msg (D_MANAGEMENT, "MANAGEMENT: %s %s",
 	 description,
 	 print_sockaddr (&man->settings.local, &gc));
 
@@ -2691,7 +2690,6 @@ management_socket_set (struct management *man,
 void
 management_io (struct management *man)
 {
-    msg(D_MANAGEMENT,"M I/O State %d in",man->connection.state);
   switch (man->connection.state)
     {
     case MS_LISTEN:
@@ -2708,7 +2706,6 @@ management_io (struct management *man)
     default:
       ASSERT (0);
     }
-    msg(D_MANAGEMENT,"M I/O State %d out",man->connection.state);
 }
 
 #endif
diff --git a/openvpn/src/openvpn/options.c b/openvpn/src/openvpn/options.c
index b74e559..c48d7be 100644
--- a/openvpn/src/openvpn/options.c
+++ b/openvpn/src/openvpn/options.c
@@ -545,6 +545,10 @@ static const char usage_message[] =
   "                  using file.\n"
   "--test-crypto   : Run a self-test of crypto features enabled.\n"
   "                  For debugging only.\n"
+#ifdef ENABLE_PREDICTION_RESISTANCE
+  "--use-prediction-resistance: Enable prediction resistance on the random\n"
+  "                             number generator.\n"
+#endif
 #ifdef ENABLE_SSL
   "\n"
   "TLS Key Negotiation Options:\n"
@@ -560,7 +564,6 @@ static const char usage_message[] =
 #if OPENSSL_VERSION_NUMBER >= 0x00907000L
   " and CRLs).\n"
 #else /* OPENSSL_VERSION_NUMBER >= 0x00907000L */
-#error WTF!
   ").\n"
   "                  WARNING: no support of CRL available with this version.\n"
 #endif /* OPENSSL_VERSION_NUMBER >= 0x00907000L */
@@ -726,7 +729,7 @@ static const char usage_message[] =
   "                  for use with the --secret option.\n"
   "--secret file   : Write key to file.\n"
 #endif				/* ENABLE_CRYPTO */
-#ifdef TUNSETPERSIST
+#ifdef ENABLE_FEATURE_TUN_PERSIST
   "\n"
   "Tun/tap config mode (available with linux 2.4+):\n"
   "--mktun         : Create a persistent tunnel.\n"
@@ -792,7 +795,7 @@ init_options (struct options *o, const bool init_gc)
   o->management_echo_buffer_size = 100;
   o->management_state_buffer_size = 100;
 #endif
-#ifdef TUNSETPERSIST
+#ifdef ENABLE_FEATURE_TUN_PERSIST
   o->persist_mode = 1;
 #endif
 #ifndef WIN32
@@ -838,6 +841,9 @@ init_options (struct options *o, const bool init_gc)
   o->replay_time = DEFAULT_TIME_BACKTRACK;
   o->use_iv = true;
   o->key_direction = KEY_DIRECTION_BIDIRECTIONAL;
+#ifdef ENABLE_PREDICTION_RESISTANCE
+  o->use_prediction_resistance = false;
+#endif
 #ifdef ENABLE_SSL
   o->key_method = 2;
   o->tls_timeout = 2;
@@ -1423,7 +1429,7 @@ show_settings (const struct options *o)
   
   SHOW_INT (mode);
 
-#ifdef TUNSETPERSIST
+#ifdef ENABLE_FEATURE_TUN_PERSIST
   SHOW_BOOL (persist_config);
   SHOW_INT (persist_mode);
 #endif
@@ -1584,6 +1590,9 @@ show_settings (const struct options *o)
   SHOW_STR (packet_id_file);
   SHOW_BOOL (use_iv);
   SHOW_BOOL (test_crypto);
+#ifdef ENABLE_PREDICTION_RESISTANCE
+  SHOW_BOOL (use_prediction_resistance);
+#endif
 
 #ifdef ENABLE_SSL
   SHOW_BOOL (tls_server);
@@ -3021,6 +3030,11 @@ options_string (const struct options *o,
 	  buf_printf (&out, ",no-replay");
 	if (!o->use_iv)
 	  buf_printf (&out, ",no-iv");
+
+#ifdef ENABLE_PREDICTION_RESISTANCE
+        if (o->use_prediction_resistance)
+          buf_printf (&out, ",use-prediction-resistance");
+#endif
       }
 
 #ifdef ENABLE_SSL
@@ -6423,6 +6437,13 @@ add_option (struct options *options,
       options->keysize = keysize;
     }
 #endif
+#ifdef ENABLE_PREDICTION_RESISTANCE
+  else if (streq (p[0], "use-prediction-resistance"))
+    {
+      VERIFY_PERMISSION (OPT_P_GENERAL);
+      options->use_prediction_resistance = true;
+    }
+#endif
 #ifdef ENABLE_SSL
   else if (streq (p[0], "show-tls"))
     {
@@ -6795,7 +6816,7 @@ add_option (struct options *options,
       options->pkcs11_id_management = true;
     }
 #endif
-#ifdef TUNSETPERSIST
+#ifdef ENABLE_FEATURE_TUN_PERSIST
   else if (streq (p[0], "rmtun"))
     {
       VERIFY_PERMISSION (OPT_P_GENERAL);
diff --git a/openvpn/src/openvpn/options.h b/openvpn/src/openvpn/options.h
index 9e78d00..1be3dfa 100644
--- a/openvpn/src/openvpn/options.h
+++ b/openvpn/src/openvpn/options.h
@@ -520,6 +520,9 @@ struct options
   const char *packet_id_file;
   bool use_iv;
   bool test_crypto;
+#ifdef ENABLE_PREDICTION_RESISTANCE
+  bool use_prediction_resistance;
+#endif
 
 #ifdef ENABLE_SSL
   /* TLS (control channel) parms */
diff --git a/openvpn/src/openvpn/packet_id.c b/openvpn/src/openvpn/packet_id.c
index 0102129..baa4966 100644
--- a/openvpn/src/openvpn/packet_id.c
+++ b/openvpn/src/openvpn/packet_id.c
@@ -501,7 +501,7 @@ packet_id_debug_print (int msglevel,
 
   buf_printf (&out, "%s [%d]", message, value);
   buf_printf (&out, " [%s-%d] [", p->name, p->unit);
-  for (i = 0; i < sl->x_size; ++i)
+  for (i = 0; sl != NULL && i < sl->x_size; ++i)
     {
       char c;
       time_t v;
@@ -538,11 +538,15 @@ packet_id_debug_print (int msglevel,
 	      p->time_backtrack,
 	      p->max_backtrack_stat,
 	      (int)p->initialized);
-  buf_printf (&out, " sl=[%d,%d,%d,%d]",
-	      sl->x_head,
-	      sl->x_size,
-	      sl->x_cap,
-	      sl->x_sizeof);
+  if (sl != NULL)
+    {
+	  buf_printf (&out, " sl=[%d,%d,%d,%d]",
+		      sl->x_head,
+		      sl->x_size,
+		      sl->x_cap,
+		      sl->x_sizeof);
+    }
+
 
   msg (msglevel, "%s", BSTR(&out));
   gc_free (&gc);
diff --git a/openvpn/src/openvpn/ssl.c b/openvpn/src/openvpn/ssl.c
index 537fc12..9f570b9 100644
--- a/openvpn/src/openvpn/ssl.c
+++ b/openvpn/src/openvpn/ssl.c
@@ -391,6 +391,11 @@ init_ssl (const struct options *options, struct tls_root_ctx *new_ctx)
       tls_ctx_restrict_ciphers(new_ctx, options->cipher_list);
     }
 
+#ifdef ENABLE_CRYPTO_POLARSSL
+  /* Personalise the random by mixing in the certificate */
+  tls_ctx_personalise_random (new_ctx);
+#endif
+
   tls_clear_error ();
   return;
 
diff --git a/openvpn/src/openvpn/ssl_backend.h b/openvpn/src/openvpn/ssl_backend.h
index 5ea6a06..f3e69dd 100644
--- a/openvpn/src/openvpn/ssl_backend.h
+++ b/openvpn/src/openvpn/ssl_backend.h
@@ -272,6 +272,16 @@ void tls_ctx_load_extra_certs (struct tls_root_ctx *ctx, const char *extra_certs
 #endif
     );
 
+#ifdef ENABLE_CRYPTO_POLARSSL
+/**
+ * Add a personalisation string to the PolarSSL RNG, based on the certificate
+ * loaded into the given context.
+ *
+ * @param ctx			TLS context to use
+ */
+void tls_ctx_personalise_random(struct tls_root_ctx *ctx);
+#endif
+
 /* **************************************
  *
  * Key-state specific functions
diff --git a/openvpn/src/openvpn/ssl_polarssl.c b/openvpn/src/openvpn/ssl_polarssl.c
index d4d85c8..fc8fa6e 100644
--- a/openvpn/src/openvpn/ssl_polarssl.c
+++ b/openvpn/src/openvpn/ssl_polarssl.c
@@ -44,6 +44,9 @@
 #include "manage.h"
 #include "ssl_common.h"
 
+#include <polarssl/sha2.h>
+#include <polarssl/havege.h>
+
 #include "ssl_verify_polarssl.h"
 #include <polarssl/pem.h>
 
@@ -85,9 +88,6 @@ tls_ctx_server_new(struct tls_root_ctx *ctx)
   ASSERT(NULL != ctx);
   CLEAR(*ctx);
 
-  ALLOC_OBJ_CLEAR(ctx->hs, havege_state);
-  havege_init(ctx->hs);
-
   ALLOC_OBJ_CLEAR(ctx->dhm_ctx, dhm_context);
   ALLOC_OBJ_CLEAR(ctx->priv_key, rsa_context);
 
@@ -103,12 +103,8 @@ void
 tls_ctx_client_new(struct tls_root_ctx *ctx)
 {
   ASSERT(NULL != ctx);
-
   CLEAR(*ctx);
 
-  ALLOC_OBJ_CLEAR(ctx->hs, havege_state);
-  havege_init(ctx->hs);
-
   ALLOC_OBJ_CLEAR(ctx->dhm_ctx, dhm_context);
   ALLOC_OBJ_CLEAR(ctx->priv_key, rsa_context);
 
@@ -143,8 +139,6 @@ tls_ctx_free(struct tls_root_ctx *ctx)
       }
 #endif
 
-      free(ctx->hs);
-
       if (ctx->allowed_ciphers)
 	free(ctx->allowed_ciphers);
 
@@ -504,6 +498,28 @@ static void my_debug( void *ctx, int level, const char *str )
     }
 }
 
+/*
+ * Further personalise the RNG using a hash of the public key
+ */
+void tls_ctx_personalise_random(struct tls_root_ctx *ctx)
+{
+  static char old_sha256_hash[32] = {0};
+  char sha256_hash[32] = {0};
+  ctr_drbg_context *cd_ctx = rand_ctx_get();
+
+  if (NULL != ctx->crt_chain)
+    {
+      x509_cert *cert = ctx->crt_chain;
+
+      sha2(cert->tbs.p, cert->tbs.len, sha256_hash, false);
+      if ( 0 != memcmp(old_sha256_hash, sha256_hash, sizeof(sha256_hash)))
+	{
+	  ctr_drbg_update(cd_ctx, sha256_hash, 32);
+	  memcpy(old_sha256_hash, sha256_hash, sizeof(old_sha256_hash));
+	}
+    }
+}
+
 void key_state_ssl_init(struct key_state_ssl *ks_ssl,
     const struct tls_root_ctx *ssl_ctx, bool is_server, void *session)
 {
@@ -517,7 +533,9 @@ void key_state_ssl_init(struct key_state_ssl *ks_ssl,
       /* Initialise SSL context */
       ssl_set_dbg (ks_ssl->ctx, my_debug, NULL);
       ssl_set_endpoint (ks_ssl->ctx, ssl_ctx->endpoint);
-      ssl_set_rng (ks_ssl->ctx, havege_rand, ssl_ctx->hs);
+
+      ssl_set_rng (ks_ssl->ctx, ctr_drbg_random, rand_ctx_get());
+
       ALLOC_OBJ_CLEAR (ks_ssl->ssn, ssl_session);
       ssl_set_session (ks_ssl->ctx, 0, 0, ks_ssl->ssn );
       if (ssl_ctx->allowed_ciphers)
diff --git a/openvpn/src/openvpn/ssl_polarssl.h b/openvpn/src/openvpn/ssl_polarssl.h
index e6149b6..2b02a6f 100644
--- a/openvpn/src/openvpn/ssl_polarssl.h
+++ b/openvpn/src/openvpn/ssl_polarssl.h
@@ -30,7 +30,6 @@
 #ifndef SSL_POLARSSL_H_
 #define SSL_POLARSSL_H_
 
-#include <polarssl/havege.h>
 #include <polarssl/ssl.h>
 #include "config.h"
 
@@ -63,7 +62,6 @@ struct tls_root_ctx {
 
     int endpoint; 		/**< Whether or not this is a server or a client */
 
-    havege_state *hs;		/**< HAVEGE random number state */
     dhm_context *dhm_ctx;	/**< Diffie-Helmann-Merkle context */
     x509_cert *crt_chain;	/**< Local Certificate chain */
     x509_cert *ca_chain;	/**< CA chain for remote verification */
diff --git a/openvpn/src/openvpn/syshead.h b/openvpn/src/openvpn/syshead.h
index 56a5429..8ce40f7 100644
--- a/openvpn/src/openvpn/syshead.h
+++ b/openvpn/src/openvpn/syshead.h
@@ -26,6 +26,7 @@
 #define SYSHEAD_H
 
 #include "compat.h"
+#include "compat-stdbool.h"
 
 /* branch prediction hints */
 #if defined(__GNUC__)
@@ -538,6 +539,11 @@ socket_defined (const socket_descriptor_t sd)
 #define MANAGMENT_EXTERNAL_KEY
 #endif
 
+/* Enable PolarSSL RNG prediction resistance support */
+#ifdef ENABLE_CRYPTO_POLARSSL
+#define ENABLE_PREDICTION_RESISTANCE
+#endif /* ENABLE_CRYPTO_POLARSSL */
+
 /*
  * MANAGEMENT_IN_EXTRA allows the management interface to
  * read multi-line inputs from clients.
diff --git a/openvpn/src/openvpn/tun.c b/openvpn/src/openvpn/tun.c
index ae372e4..7aa8627 100644
--- a/openvpn/src/openvpn/tun.c
+++ b/openvpn/src/openvpn/tun.c
@@ -1397,15 +1397,6 @@ open_tun (const char *dev, const char *dev_type, const char *dev_node, struct tu
 #error header file linux/sockios.h required
 #endif
 
-
-#if defined(HAVE_TUN_PI) && defined(HAVE_IPHDR) && defined(HAVE_IOVEC) && defined(ETH_P_IPV6) && defined(ETH_P_IP) && defined(HAVE_READV) && defined(HAVE_WRITEV)
-#define LINUX_IPV6 1
-/* #warning IPv6 ON */
-#else
-#define LINUX_IPV6 0
-/* #warning IPv6 OFF */
-#endif
-
 #if !PEDANTIC
 
 void
@@ -1413,13 +1404,6 @@ open_tun (const char *dev, const char *dev_type, const char *dev_node, struct tu
 {
   struct ifreq ifr;
 
-  /* warn if a very old linux version is used & --tun-ipv6 set
-   */
-#if LINUX_IPV6 == 0
-  if ( tt->ipv6 )
-    msg (M_WARN, "NOTE: explicit support for IPv6 tun devices is not provided for this OS");
-#endif
-
   /*
    * We handle --dev null specially, we do not open /dev/null for this.
    */
@@ -1543,7 +1527,7 @@ open_tun (const char *dev, const char *dev_type, const char *dev_node, struct tu
 #endif /* HAVE_LINUX_IF_TUN_H */
 #endif /* TARGET_ANDROID */
 
-#ifdef TUNSETPERSIST
+#ifdef ENABLE_FEATURE_TUN_PERSIST
 
 /*
  * This can be removed in future
@@ -1593,7 +1577,7 @@ tuncfg (const char *dev, const char *dev_type, const char *dev_node, int persist
   msg (M_INFO, "Persist state set to: %s", (persist_mode ? "ON" : "OFF"));
 }
 
-#endif /* TUNSETPERSIST */
+#endif /* ENABLE_FEATURE_TUN_PERSIST */
 
 void
 close_tun (struct tuntap *tt)
@@ -1649,7 +1633,6 @@ close_tun (struct tuntap *tt)
 int
 write_tun (struct tuntap* tt, uint8_t *buf, int len)
 {
-#if LINUX_IPV6
   if (tt->ipv6)
     {
       struct tun_pi pi;
@@ -1675,14 +1658,12 @@ write_tun (struct tuntap* tt, uint8_t *buf, int len)
       return(ret - sizeof(pi));
     }
   else
-#endif
     return write (tt->fd, buf, len);
 }
 
 int
 read_tun (struct tuntap* tt, uint8_t *buf, int len)
 {
-#if LINUX_IPV6
   if (tt->ipv6)
     {
       struct iovec vect[2];
@@ -1698,7 +1679,6 @@ read_tun (struct tuntap* tt, uint8_t *buf, int len)
       return(ret - sizeof(pi));
     }
   else
-#endif
     return read (tt->fd, buf, len);
 }
 
diff --git a/openvpn/src/openvpnserv/openvpnserv.c b/openvpn/src/openvpnserv/openvpnserv.c
index a9a9441..56f5a02 100755
--- a/openvpn/src/openvpnserv/openvpnserv.c
+++ b/openvpn/src/openvpnserv/openvpnserv.c
@@ -87,9 +87,9 @@ static HANDLE exit_event = NULL;
 /*
  * Message handling
  */
-#define M_INFO    (0)                                  // informational
-#define M_SYSERR  (MSG_FLAGS_ERROR|MSG_FLAGS_SYS_CODE) // error + system code
-#define M_ERR     (MSG_FLAGS_ERROR)                    // error
+#define M_INFO    (0)                                  /* informational */
+#define M_SYSERR  (MSG_FLAGS_ERROR|MSG_FLAGS_SYS_CODE) /* error + system code */
+#define M_ERR     (MSG_FLAGS_ERROR)                    /* error */
 
 /* write error to event log */
 #define MSG(flags, ...) \