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145 lines
7.5 KiB
C++
145 lines
7.5 KiB
C++
// trap.h - written and placed in public domain by Jeffrey Walton.
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/// \file trap.h
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/// \brief Debugging and diagnostic assertions
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/// \details <tt>CRYPTOPP_ASSERT</tt> is the library's debugging and diagnostic assertion. <tt>CRYPTOPP_ASSERT</tt>
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/// is enabled by <tt>CRYPTOPP_DEBUG</tt>, <tt>DEBUG</tt> or <tt>_DEBUG</tt>.
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/// \details <tt>CRYPTOPP_ASSERT</tt> raises a <tt>SIGTRAP</tt> (Unix) or calls <tt>__debugbreak()</tt> (Windows).
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/// <tt>CRYPTOPP_ASSERT</tt> is only in effect when the user requests a debug configuration. Unlike Posix assert,
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/// <tt>NDEBUG</tt> (or failure to define it) does not affect the library.
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/// The traditional Posix define <tt>NDEBUG</tt> has no effect on <tt>CRYPTOPP_DEBUG</tt> or DebugTrapHandler.
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/// \since Crypto++ 5.6.5
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/// \sa DebugTrapHandler, <A HREF="http://github.com/weidai11/cryptopp/issues/277">Issue 277</A>,
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/// <A HREF="http://seclists.org/oss-sec/2016/q3/520">CVE-2016-7420</A>
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#ifndef CRYPTOPP_TRAP_H
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#define CRYPTOPP_TRAP_H
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#include "config.h"
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#if defined(CRYPTOPP_DEBUG)
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# include <iostream>
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# include <sstream>
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# if defined(UNIX_SIGNALS_AVAILABLE)
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# include "ossig.h"
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# elif defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(__CYGWIN__)
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extern "C" __declspec(dllimport) void __stdcall DebugBreak();
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extern "C" __declspec(dllimport) int __stdcall IsDebuggerPresent();
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# endif
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#endif // CRYPTOPP_DEBUG
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// ************** run-time assertion ***************
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#if defined(CRYPTOPP_DOXYGEN_PROCESSING)
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/// \brief Debugging and diagnostic assertion
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/// \details <tt>CRYPTOPP_ASSERT</tt> is the library's debugging and diagnostic assertion. <tt>CRYPTOPP_ASSERT</tt>
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/// is enabled by the preprocessor macros <tt>CRYPTOPP_DEBUG</tt>, <tt>DEBUG</tt> or <tt>_DEBUG</tt>.
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/// \details <tt>CRYPTOPP_ASSERT</tt> raises a <tt>SIGTRAP</tt> (Unix) or calls <tt>DebugBreak()</tt> (Windows).
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/// <tt>CRYPTOPP_ASSERT</tt> is only in effect when the user explicitly requests a debug configuration.
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/// \details If you want to ensure <tt>CRYPTOPP_ASSERT</tt> is inert, then <em>do not</em> define
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/// <tt>CRYPTOPP_DEBUG</tt>, <tt>DEBUG</tt> or <tt>_DEBUG</tt>. Avoiding the defines means <tt>CRYPTOPP_ASSERT</tt>
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/// is preprocessed into an empty string.
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/// \details The traditional Posix define <tt>NDEBUG</tt> has no effect on <tt>CRYPTOPP_DEBUG</tt>, <tt>CRYPTOPP_ASSERT</tt>
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/// or DebugTrapHandler.
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/// \details An example of using \ref CRYPTOPP_ASSERT "CRYPTOPP_ASSERT" and DebugTrapHandler is shown below. The library's
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/// test program, <tt>cryptest.exe</tt> (from test.cpp), exercises the structure:
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/// <pre>
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/// #if defined(CRYPTOPP_DEBUG) && defined(UNIX_SIGNALS_AVAILABLE)
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/// static const DebugTrapHandler g_dummyHandler;
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/// #endif
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///
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/// int main(int argc, char* argv[])
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/// {
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/// CRYPTOPP_ASSERT(argv != nullptr);
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/// ...
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/// }
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/// </pre>
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/// \since Crypto++ 5.6.5
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/// \sa DebugTrapHandler, SignalHandler, <A HREF="http://github.com/weidai11/cryptopp/issues/277">Issue 277</A>,
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/// <A HREF="http://seclists.org/oss-sec/2016/q3/520">CVE-2016-7420</A>
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# define CRYPTOPP_ASSERT(exp) { ... }
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#endif
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#if defined(CRYPTOPP_DEBUG) && defined(UNIX_SIGNALS_AVAILABLE)
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# define CRYPTOPP_ASSERT(exp) { \
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if (!(exp)) { \
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std::ostringstream oss; \
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oss << "Assertion failed: " << (char*)(__FILE__) << "(" \
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<< (int)(__LINE__) << "): " << (char*)(__func__) \
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<< std::endl; \
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std::cerr << oss.str(); \
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raise(SIGTRAP); \
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} \
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}
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#elif CRYPTOPP_DEBUG && defined(CRYPTOPP_WIN32_AVAILABLE) && !defined(__CYGWIN__)
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# define CRYPTOPP_ASSERT(exp) { \
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if (!(exp)) { \
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std::ostringstream oss; \
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oss << "Assertion failed: " << (char*)(__FILE__) << "(" \
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<< (int)(__LINE__) << "): " << (char*)(__FUNCTION__) \
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<< std::endl; \
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std::cerr << oss.str(); \
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if (IsDebuggerPresent()) {DebugBreak();} \
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} \
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}
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#endif // DEBUG and Unix or Windows
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// Remove CRYPTOPP_ASSERT in non-debug builds.
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// Can't use CRYPTOPP_UNUSED due to circular dependency
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#ifndef CRYPTOPP_ASSERT
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# define CRYPTOPP_ASSERT(exp) (void)0
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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// ************** SIGTRAP handler ***************
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#if (CRYPTOPP_DEBUG && defined(UNIX_SIGNALS_AVAILABLE)) || defined(CRYPTOPP_DOXYGEN_PROCESSING)
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/// \brief Default SIGTRAP handler
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/// \details DebugTrapHandler() can be used by a program to install an empty SIGTRAP handler. If present,
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/// the handler ensures there is a signal handler in place for <tt>SIGTRAP</tt> raised by
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/// <tt>CRYPTOPP_ASSERT</tt>. If <tt>CRYPTOPP_ASSERT</tt> raises <tt>SIGTRAP</tt> <em>without</em>
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/// a handler, then one of two things can occur. First, the OS might allow the program
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/// to continue. Second, the OS might terminate the program. OS X allows the program to continue, while
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/// some Linuxes terminate the program.
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/// \details If DebugTrapHandler detects another handler in place, then it will not install a handler. This
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/// ensures a debugger can gain control of the <tt>SIGTRAP</tt> signal without contention. It also allows multiple
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/// DebugTrapHandler to be created without contentious or unusual behavior. Though multiple DebugTrapHandler can be
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/// created, a program should only create one, if needed.
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/// \details A DebugTrapHandler is subject to C++ static initialization [dis]order. If you need to install a handler
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/// and it must be installed early, then reference the code associated with <tt>CRYPTOPP_INIT_PRIORITY</tt> in
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/// cryptlib.cpp and cpu.cpp.
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/// \details If you want to ensure <tt>CRYPTOPP_ASSERT</tt> is inert, then <em>do not</em> define
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/// <tt>CRYPTOPP_DEBUG</tt>, <tt>DEBUG</tt> or <tt>_DEBUG</tt>. Avoiding the defines means <tt>CRYPTOPP_ASSERT</tt>
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/// is processed into <tt>((void)(exp))</tt>.
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/// \details The traditional Posix define <tt>NDEBUG</tt> has no effect on <tt>CRYPTOPP_DEBUG</tt>, <tt>CRYPTOPP_ASSERT</tt>
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/// or DebugTrapHandler.
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/// \details An example of using \ref CRYPTOPP_ASSERT "CRYPTOPP_ASSERT" and DebugTrapHandler is shown below. The library's
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/// test program, <tt>cryptest.exe</tt> (from test.cpp), exercises the structure:
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/// <pre>
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/// #if defined(CRYPTOPP_DEBUG) && defined(UNIX_SIGNALS_AVAILABLE)
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/// static const DebugTrapHandler g_dummyHandler;
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/// #endif
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///
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/// int main(int argc, char* argv[])
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/// {
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/// CRYPTOPP_ASSERT(argv != nullptr);
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/// ...
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/// }
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/// </pre>
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/// \since Crypto++ 5.6.5
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/// \sa \ref CRYPTOPP_ASSERT "CRYPTOPP_ASSERT", SignalHandler, <A HREF="http://github.com/weidai11/cryptopp/issues/277">Issue 277</A>,
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/// <A HREF="http://seclists.org/oss-sec/2016/q3/520">CVE-2016-7420</A>
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#if defined(CRYPTOPP_DOXYGEN_PROCESSING)
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class DebugTrapHandler : public SignalHandler<SIGILL, false> { };
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#else
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typedef SignalHandler<SIGILL, false> DebugTrapHandler;
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#endif
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#endif // Linux, Unix and Documentation
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NAMESPACE_END
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#endif // CRYPTOPP_TRAP_H
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