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164 lines
7.5 KiB
C++
164 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
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/// assertion. <tt>CRYPTOPP_ASSERT</tt> is enabled by <tt>CRYPTOPP_DEBUG</tt>,
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/// <tt>DEBUG</tt> or <tt>_DEBUG</tt>.
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/// \details <tt>CRYPTOPP_ASSERT</tt> raises a <tt>SIGTRAP</tt> (Unix) or calls
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/// <tt>DebugBreak()</tt> (Windows).
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/// \details <tt>CRYPTOPP_ASSERT</tt> is only in effect when the user requests a
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/// debug configuration. <tt>NDEBUG</tt> (or failure to define it) does not
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/// affect <tt>CRYPTOPP_ASSERT</tt>.
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/// \since Crypto++ 5.6.5
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/// \sa DebugTrapHandler, <A
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/// 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
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/// assertion. <tt>CRYPTOPP_ASSERT</tt> is enabled by the preprocessor macros
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/// <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
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/// <tt>DebugBreak()</tt> (Windows). <tt>CRYPTOPP_ASSERT</tt> is only in effect
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/// 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
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/// not</em> define <tt>CRYPTOPP_DEBUG</tt>, <tt>DEBUG</tt> or <tt>_DEBUG</tt>.
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/// Avoiding the defines means <tt>CRYPTOPP_ASSERT</tt> is preprocessed into an
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/// empty string.
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/// \details The traditional Posix define <tt>NDEBUG</tt> has no effect on
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/// <tt>CRYPTOPP_DEBUG</tt>, <tt>CRYPTOPP_ASSERT</tt> or DebugTrapHandler.
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/// \details An example of using CRYPTOPP_ASSERT and DebugTrapHandler is shown
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/// below. The library's test program, <tt>cryptest.exe</tt> (from test.cpp),
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/// 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
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/// 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)
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# if defined(UNIX_SIGNALS_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: " << __FILE__ << "(" \
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<< __LINE__ << "): " << __func__ \
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<< std::endl; \
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std::cout << std::flush; \
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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)
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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: " << __FILE__ << "(" \
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<< __LINE__ << "): " << __FUNCTION__ \
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<< std::endl; \
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std::cout << std::flush; \
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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 // Unix or Windows
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#endif // CRYPTOPP_DEBUG
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// Remove CRYPTOPP_ASSERT in non-debug builds.
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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
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/// SIGTRAP handler. If present, the handler ensures there is a signal
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/// handler in place for <tt>SIGTRAP</tt> raised by
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/// <tt>CRYPTOPP_ASSERT</tt>. If <tt>CRYPTOPP_ASSERT</tt> raises
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/// <tt>SIGTRAP</tt> <em>without</em> a handler, then one of two things can
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/// occur. First, the OS might allow the program to continue. Second, the OS
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/// 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
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/// not install a handler. This ensures a debugger can gain control of the
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/// <tt>SIGTRAP</tt> signal without contention. It also allows multiple
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/// DebugTrapHandler to be created without contentious or unusual behavior.
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/// Though multiple DebugTrapHandler can be created, a program should only
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/// create one, if needed.
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/// \details A DebugTrapHandler is subject to C++ static initialization
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/// [dis]order. If you need to install a handler and it must be installed
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/// early, then reference the code associated with
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/// <tt>CRYPTOPP_INIT_PRIORITY</tt> in cryptlib.cpp and cpu.cpp.
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/// \details If you want to ensure <tt>CRYPTOPP_ASSERT</tt> is inert, then
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/// <em>do not</em> define <tt>CRYPTOPP_DEBUG</tt>, <tt>DEBUG</tt> or
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/// <tt>_DEBUG</tt>. Avoiding the defines means <tt>CRYPTOPP_ASSERT</tt>
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/// is processed into <tt>((void)0)</tt>.
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/// \details The traditional Posix define <tt>NDEBUG</tt> has no effect on
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/// <tt>CRYPTOPP_DEBUG</tt>, <tt>CRYPTOPP_ASSERT</tt> or DebugTrapHandler.
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/// \details An example of using \ref CRYPTOPP_ASSERT "CRYPTOPP_ASSERT" and
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/// DebugTrapHandler is shown below. The library's test program,
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/// <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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/// 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
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/// 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<SIGTRAP, false> { };
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#else
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typedef SignalHandler<SIGTRAP, 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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