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minetest/src/debug.cpp
est31 5e507c9829 Add server side ncurses terminal 
This adds a chat console the server owner can use for administration
or to talk with players.
It runs in its own thread, which makes the user interface immune to
the server's lag, behaving just like a client, except timeout.
As it uses the same console code as the f10 console, things like nick
completion or a scroll buffer basically come for free.
The terminal itself is written in a general way so that adding a
client version later on is just about implementing an interface.

Fatal errors are printed after the console exists and the ncurses
terminal buffer gets cleaned up with endwin(), so that the error still
remains visible.

The server owner can chose their username their entered text will
have in chat and where players can send PMs to.
Once the username is secured with a password to prevent anybody to
take over the server, the owner can execute admin tasks over the
console.

This change includes a contribution by @kahrl who has improved ncurses
library detection.
2015-11-06 08:51:14 +01:00

356 lines
8.9 KiB
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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "porting.h"
#include "debug.h"
#include "exceptions.h"
#include "threads.h"
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <map>
#include <sstream>
#include "threading/mutex.h"
#include "threading/mutex_auto_lock.h"
#include "config.h"
#ifdef _MSC_VER
#include <dbghelp.h>
#include "version.h"
#include "filesys.h"
#endif
#if USE_CURSES
#include "terminal_chat_console.h"
#endif
/*
Assert
*/
void sanity_check_fn(const char *assertion, const char *file,
unsigned int line, const char *function)
{
#if USE_CURSES
g_term_console.stopAndWaitforThread();
#endif
errorstream << std::endl << "In thread " << std::hex
<< thr_get_current_thread_id() << ":" << std::endl;
errorstream << file << ":" << line << ": " << function
<< ": An engine assumption '" << assertion << "' failed." << std::endl;
debug_stacks_print_to(errorstream);
abort();
}
void fatal_error_fn(const char *msg, const char *file,
unsigned int line, const char *function)
{
#if USE_CURSES
g_term_console.stopAndWaitforThread();
#endif
errorstream << std::endl << "In thread " << std::hex
<< thr_get_current_thread_id() << ":" << std::endl;
errorstream << file << ":" << line << ": " << function
<< ": A fatal error occured: " << msg << std::endl;
debug_stacks_print_to(errorstream);
abort();
}
/*
DebugStack
*/
struct DebugStack
{
DebugStack(threadid_t id);
void print(FILE *file, bool everything);
void print(std::ostream &os, bool everything);
threadid_t threadid;
char stack[DEBUG_STACK_SIZE][DEBUG_STACK_TEXT_SIZE];
int stack_i; // Points to the lowest empty position
int stack_max_i; // Highest i that was seen
};
DebugStack::DebugStack(threadid_t id)
{
threadid = id;
stack_i = 0;
stack_max_i = 0;
memset(stack, 0, DEBUG_STACK_SIZE*DEBUG_STACK_TEXT_SIZE);
}
void DebugStack::print(FILE *file, bool everything)
{
std::ostringstream os;
os << threadid;
fprintf(file, "DEBUG STACK FOR THREAD %s:\n",
os.str().c_str());
for(int i=0; i<stack_max_i; i++)
{
if(i == stack_i && everything == false)
break;
if(i < stack_i)
fprintf(file, "#%d %s\n", i, stack[i]);
else
fprintf(file, "(Leftover data: #%d %s)\n", i, stack[i]);
}
if(stack_i == DEBUG_STACK_SIZE)
fprintf(file, "Probably overflown.\n");
}
void DebugStack::print(std::ostream &os, bool everything)
{
os<<"DEBUG STACK FOR THREAD "<<threadid<<": "<<std::endl;
for(int i=0; i<stack_max_i; i++)
{
if(i == stack_i && everything == false)
break;
if(i < stack_i)
os<<"#"<<i<<" "<<stack[i]<<std::endl;
else
os<<"(Leftover data: #"<<i<<" "<<stack[i]<<")"<<std::endl;
}
if(stack_i == DEBUG_STACK_SIZE)
os<<"Probably overflown."<<std::endl;
}
// Note: Using pthread_t (that is, threadid_t on POSIX platforms) as the key to
// a std::map is naughty. Formally, a pthread_t may only be compared using
// pthread_equal() - pthread_t lacks the well-ordered property needed for
// comparisons in binary searches. This should be fixed at some point by
// defining a custom comparator with an arbitrary but stable ordering of
// pthread_t, but it isn't too important since none of our supported platforms
// implement pthread_t as a non-ordinal type.
std::map<threadid_t, DebugStack*> g_debug_stacks;
Mutex g_debug_stacks_mutex;
void debug_stacks_init()
{
}
void debug_stacks_print_to(std::ostream &os)
{
MutexAutoLock lock(g_debug_stacks_mutex);
os<<"Debug stacks:"<<std::endl;
for(std::map<threadid_t, DebugStack*>::iterator
i = g_debug_stacks.begin();
i != g_debug_stacks.end(); ++i)
{
i->second->print(os, false);
}
}
void debug_stacks_print()
{
debug_stacks_print_to(errorstream);
}
DebugStacker::DebugStacker(const char *text)
{
threadid_t threadid = thr_get_current_thread_id();
MutexAutoLock lock(g_debug_stacks_mutex);
std::map<threadid_t, DebugStack*>::iterator n;
n = g_debug_stacks.find(threadid);
if(n != g_debug_stacks.end())
{
m_stack = n->second;
}
else
{
/*DEBUGPRINT("Creating new debug stack for thread %x\n",
(unsigned int)threadid);*/
m_stack = new DebugStack(threadid);
g_debug_stacks[threadid] = m_stack;
}
if(m_stack->stack_i >= DEBUG_STACK_SIZE)
{
m_overflowed = true;
}
else
{
m_overflowed = false;
snprintf(m_stack->stack[m_stack->stack_i],
DEBUG_STACK_TEXT_SIZE, "%s", text);
m_stack->stack_i++;
if(m_stack->stack_i > m_stack->stack_max_i)
m_stack->stack_max_i = m_stack->stack_i;
}
}
DebugStacker::~DebugStacker()
{
MutexAutoLock lock(g_debug_stacks_mutex);
if(m_overflowed == true)
return;
m_stack->stack_i--;
if(m_stack->stack_i == 0)
{
threadid_t threadid = m_stack->threadid;
/*DEBUGPRINT("Deleting debug stack for thread %x\n",
(unsigned int)threadid);*/
delete m_stack;
g_debug_stacks.erase(threadid);
}
}
#ifdef _MSC_VER
const char *Win32ExceptionCodeToString(DWORD exception_code)
{
switch (exception_code) {
case EXCEPTION_ACCESS_VIOLATION:
return "Access violation";
case EXCEPTION_DATATYPE_MISALIGNMENT:
return "Misaligned data access";
case EXCEPTION_BREAKPOINT:
return "Breakpoint reached";
case EXCEPTION_SINGLE_STEP:
return "Single debug step";
case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
return "Array access out of bounds";
case EXCEPTION_FLT_DENORMAL_OPERAND:
return "Denormal floating point operand";
case EXCEPTION_FLT_DIVIDE_BY_ZERO:
return "Floating point division by zero";
case EXCEPTION_FLT_INEXACT_RESULT:
return "Inaccurate floating point result";
case EXCEPTION_FLT_INVALID_OPERATION:
return "Invalid floating point operation";
case EXCEPTION_FLT_OVERFLOW:
return "Floating point exponent overflow";
case EXCEPTION_FLT_STACK_CHECK:
return "Floating point stack overflow or underflow";
case EXCEPTION_FLT_UNDERFLOW:
return "Floating point exponent underflow";
case EXCEPTION_INT_DIVIDE_BY_ZERO:
return "Integer division by zero";
case EXCEPTION_INT_OVERFLOW:
return "Integer overflow";
case EXCEPTION_PRIV_INSTRUCTION:
return "Privileged instruction executed";
case EXCEPTION_IN_PAGE_ERROR:
return "Could not access or load page";
case EXCEPTION_ILLEGAL_INSTRUCTION:
return "Illegal instruction encountered";
case EXCEPTION_NONCONTINUABLE_EXCEPTION:
return "Attempted to continue after fatal exception";
case EXCEPTION_STACK_OVERFLOW:
return "Stack overflow";
case EXCEPTION_INVALID_DISPOSITION:
return "Invalid disposition returned to the exception dispatcher";
case EXCEPTION_GUARD_PAGE:
return "Attempted guard page access";
case EXCEPTION_INVALID_HANDLE:
return "Invalid handle";
}
return "Unknown exception";
}
long WINAPI Win32ExceptionHandler(struct _EXCEPTION_POINTERS *pExceptInfo)
{
char buf[512];
MINIDUMP_EXCEPTION_INFORMATION mdei;
MINIDUMP_USER_STREAM_INFORMATION mdusi;
MINIDUMP_USER_STREAM mdus;
bool minidump_created = false;
std::string dumpfile = porting::path_user + DIR_DELIM PROJECT_NAME ".dmp";
std::string version_str(PROJECT_NAME " ");
version_str += g_version_hash;
HANDLE hFile = CreateFileA(dumpfile.c_str(), GENERIC_WRITE,
FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
goto minidump_failed;
if (SetEndOfFile(hFile) == FALSE)
goto minidump_failed;
mdei.ClientPointers = NULL;
mdei.ExceptionPointers = pExceptInfo;
mdei.ThreadId = GetCurrentThreadId();
mdus.Type = CommentStreamA;
mdus.BufferSize = version_str.size();
mdus.Buffer = (PVOID)version_str.c_str();
mdusi.UserStreamArray = &mdus;
mdusi.UserStreamCount = 1;
if (MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(), hFile,
MiniDumpNormal, &mdei, &mdusi, NULL) == FALSE)
goto minidump_failed;
minidump_created = true;
minidump_failed:
CloseHandle(hFile);
DWORD excode = pExceptInfo->ExceptionRecord->ExceptionCode;
_snprintf(buf, sizeof(buf),
" >> === FATAL ERROR ===\n"
" >> %s (Exception 0x%08X) at 0x%p\n",
Win32ExceptionCodeToString(excode), excode,
pExceptInfo->ExceptionRecord->ExceptionAddress);
dstream << buf;
if (minidump_created)
dstream << " >> Saved dump to " << dumpfile << std::endl;
else
dstream << " >> Failed to save dump" << std::endl;
return EXCEPTION_EXECUTE_HANDLER;
}
#endif
void debug_set_exception_handler()
{
#ifdef _MSC_VER
SetUnhandledExceptionFilter(Win32ExceptionHandler);
#endif
}
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