This is the start of the BETA21 branch.

It includes the --topology feature, and
TAP-Win32 driver changes to allow
non-admin access.



git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@580 e7ae566f-a301-0410-adde-c780ea21d3b5

1 files changed, 342 insertions, 0 deletions

diff --git a/error.h b/error.h
new file mode 100644
index 0000000..8bcc909
--- /dev/null
+++ b/error.h
@@ -0,0 +1,342 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef ERROR_H
+#define ERROR_H
+
+#include "basic.h"
+#include "thread.h"
+
+/* #define ABORT_ON_ERROR */
+
+#define ERR_BUF_SIZE 1024
+
+struct gc_arena;
+
+/*
+ * Where should messages be printed before syslog is opened?
+ * Not used if OPENVPN_DEBUG_COMMAND_LINE is defined.
+ */
+#define OPENVPN_MSG_FP stdout
+
+/*
+ * Exit status codes
+ */
+
+#define OPENVPN_EXIT_STATUS_GOOD                    0
+#define OPENVPN_EXIT_STATUS_ERROR                   1
+#define OPENVPN_EXIT_STATUS_USAGE                   1
+#define OPENVPN_EXIT_STATUS_CANNOT_OPEN_DEBUG_FILE  1
+
+/*
+ * Special command line debugging mode.
+ * If OPENVPN_DEBUG_COMMAND_LINE
+ * is defined, contents of argc/argv will
+ * be dumped to OPENVPN_DEBUG_FILE as well
+ * as all other OpenVPN messages.
+ */
+
+/* #define OPENVPN_DEBUG_COMMAND_LINE */
+#define OPENVPN_DEBUG_FILE PACKAGE ".log"
+
+/* String and Error functions */
+
+#ifdef WIN32
+# define openvpn_errno()             GetLastError()
+# define openvpn_errno_socket()      WSAGetLastError()
+# define openvpn_strerror(e, gc)     strerror_win32(e, gc)
+  const char *strerror_win32 (DWORD errnum, struct gc_arena *gc);
+#else
+# define openvpn_errno()             errno
+# define openvpn_errno_socket()      errno
+# define openvpn_strerror(x, gc)     strerror(x)
+#endif
+
+/*
+ * These globals should not be accessed directly,
+ * but rather through macros or inline functions defined below.
+ */
+extern unsigned int x_debug_level;
+extern int x_msg_line_num;
+
+/* msg() flags */
+
+#define M_DEBUG_LEVEL     (0x0F)	 /* debug level mask */
+
+#define M_FATAL           (1<<4)	 /* exit program */
+#define M_NONFATAL        (1<<5)	 /* non-fatal error */
+#define M_WARN	          (1<<6)	 /* call syslog with LOG_WARNING */
+#define M_DEBUG           (1<<7)
+
+#define M_ERRNO           (1<<8)	 /* show errno description */
+#define M_ERRNO_SOCK      (1<<9)	 /* show socket errno description */
+#define M_SSL             (1<<10)	 /* show SSL error */
+#define M_NOMUTE          (1<<11)        /* don't do mute processing */
+#define M_NOPREFIX        (1<<12)        /* don't show date/time prefix */
+#define M_USAGE_SMALL     (1<<13)        /* fatal options error, call usage_small */
+#define M_MSG_VIRT_OUT    (1<<14)        /* output message through msg_status_output callback */
+#define M_OPTERR          (1<<15)        /* print "Options error:" prefix */
+
+/* flag combinations which are frequently used */
+#define M_ERR     (M_FATAL | M_ERRNO)
+#define M_SOCKERR (M_FATAL | M_ERRNO_SOCK)
+#define M_SSLERR  (M_FATAL | M_SSL)
+#define M_USAGE   (M_USAGE_SMALL | M_NOPREFIX | M_OPTERR)
+#define M_CLIENT  (M_MSG_VIRT_OUT|M_NOMUTE)
+
+/*
+ * Mute levels are designed to avoid large numbers of
+ * mostly similar messages clogging the log file.
+ *
+ * A mute level of 0 is always printed.
+ */
+#define MUTE_LEVEL_SHIFT 16
+#define MUTE_LEVEL_MASK 0xFF
+
+#define ENCODE_MUTE_LEVEL(mute_level) (((mute_level) & MUTE_LEVEL_MASK) << MUTE_LEVEL_SHIFT)
+#define DECODE_MUTE_LEVEL(flags) (((flags) >> MUTE_LEVEL_SHIFT) & MUTE_LEVEL_MASK)
+
+/*
+ * log_level:  verbosity level n (--verb n) must be >= log_level to print.
+ * mute_level: don't print more than n (--mute n) consecutive messages at
+ *             a given mute level, or if 0 disable muting and print everything.
+ */
+#define LOGLEV(log_level, mute_level, other) ((log_level) | ENCODE_MUTE_LEVEL(mute_level) | other)
+
+/*
+ * If compiler supports variable arguments in macros, define
+ * msg() as a macro for optimization win.
+ */
+
+bool dont_mute (unsigned int flags); /* check muting filter */
+
+#define MSG_TEST(flags) (((((unsigned int)flags) & M_DEBUG_LEVEL) <= x_debug_level) && dont_mute (flags))
+
+#if defined(HAVE_CPP_VARARG_MACRO_ISO) && !defined(__LCLINT__)
+# define HAVE_VARARG_MACROS
+# define msg(flags, ...) do { if (MSG_TEST(flags)) x_msg((flags), __VA_ARGS__); } while (false)
+# ifdef ENABLE_DEBUG
+#  define dmsg(flags, ...) do { if (MSG_TEST(flags)) x_msg((flags), __VA_ARGS__); } while (false)
+# else
+#  define dmsg(flags, ...)
+# endif
+#elif defined(HAVE_CPP_VARARG_MACRO_GCC) && !defined(__LCLINT__)
+# define HAVE_VARARG_MACROS
+# define msg(flags, args...) do { if (MSG_TEST(flags)) x_msg((flags), args); } while (false)
+# ifdef ENABLE_DEBUG
+#  define dmsg(flags, args...) do { if (MSG_TEST(flags)) x_msg((flags), args); } while (false)
+# else
+#  define dmsg(flags, args...)
+# endif
+#else
+# if !PEDANTIC
+#  ifdef _MSC_VER
+#   pragma message("this compiler appears to lack vararg macros which will cause a significant degradation in efficiency")
+#  else
+#   warning this compiler appears to lack vararg macros which will cause a significant degradation in efficiency (you can ignore this warning if you are using LCLINT)
+#  endif
+# endif
+# define msg x_msg
+# define dmsg x_msg
+#endif
+
+void x_msg (const unsigned int flags, const char *format, ...)
+#ifdef __GNUC__
+    __attribute__ ((format (printf, 2, 3)))
+#endif
+    ; /* should be called via msg above */
+
+/*
+ * Function prototypes
+ */
+
+void error_reset (void);
+void set_suppress_timestamps (bool suppressed);
+
+#define SDL_CONSTRAIN (1<<0)
+bool set_debug_level (const int level, const unsigned int flags);
+
+bool set_mute_cutoff (const int cutoff);
+
+int get_debug_level (void);
+int get_mute_cutoff (void);
+
+const char *msg_flags_string (const unsigned int flags, struct gc_arena *gc);
+
+/*
+ * File to print messages to before syslog is opened.
+ */
+FILE *msg_fp(void);
+
+/* Fatal logic errors */
+#define ASSERT(x) do { if (!(x)) assert_failed(__FILE__, __LINE__); } while (false)
+
+void assert_failed (const char *filename, int line);
+
+/* Inline functions */
+
+static inline bool
+check_debug_level (unsigned int level)
+{
+  return (level & M_DEBUG_LEVEL) <= x_debug_level;
+}
+
+/* syslog output */
+
+void open_syslog (const char *pgmname, bool stdio_to_null);
+void close_syslog ();
+
+/* log file output */
+void redirect_stdout_stderr (const char *file, bool append);
+
+#ifdef WIN32
+/* get original stderr handle, even if redirected by --log/--log-append */
+HANDLE get_orig_stderr (void);
+#endif
+
+/* exit program */
+void openvpn_exit (const int status);
+
+/*
+ * Check the return status of read/write routines.
+ */
+
+struct link_socket;
+struct tuntap;
+
+extern unsigned int x_cs_info_level;
+extern unsigned int x_cs_verbose_level;
+extern unsigned int x_cs_err_delay_ms;
+
+void reset_check_status (void);
+void set_check_status (unsigned int info_level, unsigned int verbose_level);
+
+void x_check_status (int status,
+		     const char *description,
+		     struct link_socket *sock,
+		     struct tuntap *tt);
+
+static inline void
+check_status (int status, const char *description, struct link_socket *sock, struct tuntap *tt)
+{
+  if (status < 0 || check_debug_level (x_cs_verbose_level))
+    x_check_status (status, description, sock, tt);
+}
+
+static inline void
+set_check_status_error_delay (unsigned int milliseconds)
+{
+  x_cs_err_delay_ms = milliseconds;
+}
+
+/*
+ * In multiclient mode, put a client-specific prefix
+ * before each message.
+ *
+ * TODO: x_msg_prefix should be thread-local
+ */
+
+extern const char *x_msg_prefix;
+
+#ifdef USE_PTHREAD
+extern pthread_key_t x_msg_prefix_key;
+#endif
+
+void msg_thread_init (void);
+void msg_thread_uninit (void);
+
+static inline void
+msg_set_prefix (const char *prefix)
+{
+#ifdef USE_PTHREAD
+  if (openvpn_thread_enabled ())
+    {
+      ASSERT (!pthread_setspecific (x_msg_prefix_key, prefix));
+    }
+  else
+#endif
+    x_msg_prefix = prefix;
+}
+
+static inline const char *
+msg_get_prefix (void)
+{
+#ifdef USE_PTHREAD
+  if (openvpn_thread_enabled ())
+    return (const char *) pthread_getspecific (x_msg_prefix_key);
+  else
+#endif
+    return x_msg_prefix;
+}
+
+/*
+ * Allow MSG to be redirected through a virtual_output object
+ */
+
+struct virtual_output;
+
+extern const struct virtual_output *x_msg_virtual_output;
+
+static inline void
+msg_set_virtual_output (const struct virtual_output *vo)
+{
+  x_msg_virtual_output = vo;
+}
+
+static inline const struct virtual_output *
+msg_get_virtual_output (void)
+{
+  return x_msg_virtual_output;
+}
+
+/*
+ * Return true if this is a system error
+ * which can be safely ignored.
+ */
+static inline bool
+ignore_sys_error (const int err)
+{
+  /* I/O operation pending */
+#ifdef WIN32
+  if (err == WSAEWOULDBLOCK || err == WSAEINVAL)
+    return true;
+#else
+  if (err == EAGAIN)
+    return true;
+#endif
+
+#if 0 /* if enabled, suppress ENOBUFS errors */
+#ifdef ENOBUFS
+  /* No buffer space available */
+  if (err == ENOBUFS)
+    return true;
+#endif
+#endif
+
+  return false;
+}
+
+#include "errlevel.h"
+
+#endif