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/*
** Zabbix
** Copyright (C) 2001-2020 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 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 General Public License for more details.
**
** You should have received a copy of the GNU 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 "common.h"
#include "log.h"
#include <excpt.h>
#include <DbgHelp.h>
#pragma comment(lib, "DbgHelp.lib")
#define STACKWALK_MAX_NAMELEN 4096
#define ZBX_LSHIFT(value, bits) (((unsigned __int64)value) << bits)
extern const char *progname;
#ifdef _M_X64
#define ZBX_IMAGE_FILE_MACHINE IMAGE_FILE_MACHINE_AMD64
static void print_register(const char *name, unsigned __int64 value)
{
zabbix_log(LOG_LEVEL_CRIT, "%-7s = %16I64x = %20I64u = %20I64d", name, value, value, value);
}
static void print_fatal_info(CONTEXT *pctx)
{
zabbix_log(LOG_LEVEL_CRIT, "====== Fatal information: ======");
zabbix_log(LOG_LEVEL_CRIT, "Program counter: 0x%08lx", pctx->Rip);
zabbix_log(LOG_LEVEL_CRIT, "=== Registers: ===");
print_register("r8", pctx->R8);
print_register("r9", pctx->R9);
print_register("r10", pctx->R10);
print_register("r11", pctx->R11);
print_register("r12", pctx->R12);
print_register("r13", pctx->R13);
print_register("r14", pctx->R14);
print_register("r15", pctx->R15);
print_register("rdi", pctx->Rdi);
print_register("rsi", pctx->Rsi);
print_register("rbp", pctx->Rbp);
print_register("rbx", pctx->Rbx);
print_register("rdx", pctx->Rdx);
print_register("rax", pctx->Rax);
print_register("rcx", pctx->Rcx);
print_register("rsp", pctx->Rsp);
print_register("efl", pctx->EFlags);
print_register("csgsfs", ZBX_LSHIFT(pctx->SegCs, 24) | ZBX_LSHIFT(pctx->SegGs, 16) | ZBX_LSHIFT(pctx->SegFs, 8));
}
#else
#define ZBX_IMAGE_FILE_MACHINE IMAGE_FILE_MACHINE_I386
static void print_register(const char *name, unsigned __int32 value)
{
zabbix_log(LOG_LEVEL_CRIT, "%-7s = %16lx = %20lu = %20ld", name, value, value, value);
}
static void print_fatal_info(CONTEXT *pctx)
{
zabbix_log(LOG_LEVEL_CRIT, "====== Fatal information: ======");
zabbix_log(LOG_LEVEL_CRIT, "Program counter: 0x%04x", pctx->Eip);
zabbix_log(LOG_LEVEL_CRIT, "=== Registers: ===");
print_register("edi", pctx->Edi);
print_register("esi", pctx->Esi);
print_register("ebp", pctx->Ebp);
print_register("ebx", pctx->Ebx);
print_register("edx", pctx->Edx);
print_register("eax", pctx->Eax);
print_register("ecx", pctx->Ecx);
print_register("esp", pctx->Esp);
print_register("efl", pctx->EFlags);
print_register("csgsfs", ZBX_LSHIFT(pctx->SegCs, 24) | ZBX_LSHIFT(pctx->SegGs, 16) | ZBX_LSHIFT(pctx->SegFs, 8));
}
#endif
typedef BOOL (WINAPI *SymGetLineFromAddrW64_func_t)(HANDLE, DWORD64, PDWORD, PIMAGEHLP_LINE64);
typedef BOOL (WINAPI *SymFromAddr_func_t)(HANDLE a, DWORD64 b , PDWORD64 c, PSYMBOL_INFO d);
void zbx_backtrace(void)
{
}
static void print_backtrace(CONTEXT *pctx)
{
SymGetLineFromAddrW64_func_t zbx_SymGetLineFromAddrW64 = NULL;
SymFromAddr_func_t zbx_SymFromAddr = NULL;
CONTEXT ctx, ctxcount;
STACKFRAME64 s, scount;
PSYMBOL_INFO pSym = NULL;
HMODULE hModule;
HANDLE hProcess, hThread;
DWORD64 offset;
wchar_t szProcessName[MAX_PATH];
char *process_name = NULL, *process_path = NULL, *frame = NULL;
size_t frame_alloc = 0, frame_offset;
int nframes = 0;
ctx = *pctx;
zabbix_log(LOG_LEVEL_CRIT, "=== Backtrace: ===");
memset(&s, 0, sizeof(s));
s.AddrPC.Mode = AddrModeFlat;
s.AddrFrame.Mode = AddrModeFlat;
s.AddrStack.Mode = AddrModeFlat;
#ifdef _M_X64
s.AddrPC.Offset = ctx.Rip;
s.AddrFrame.Offset = ctx.Rbp;
s.AddrStack.Offset = ctx.Rsp;
#else
s.AddrPC.Offset = ctx.Eip;
s.AddrFrame.Offset = ctx.Ebp;
s.AddrStack.Offset = ctx.Esp;
#endif
hProcess = GetCurrentProcess();
hThread = GetCurrentThread();
if (0 != GetModuleFileNameEx(hProcess, NULL, szProcessName, ARRSIZE(szProcessName)))
{
char *ptr;
size_t path_alloc = 0, path_offset = 0;
process_name = zbx_unicode_to_utf8(szProcessName);
if (NULL != (ptr = strstr(process_name, progname)))
zbx_strncpy_alloc(&process_path, &path_alloc, &path_offset, process_name, ptr - process_name);
}
if (NULL != (hModule = GetModuleHandle(TEXT("DbgHelp.DLL"))))
{
zbx_SymGetLineFromAddrW64 = (SymGetLineFromAddrW64_func_t)GetProcAddress(hModule,
"SymGetLineFromAddr64");
zbx_SymFromAddr = (SymFromAddr_func_t)GetProcAddress(hModule, "SymFromAddr");
}
if (NULL != zbx_SymFromAddr || NULL != zbx_SymGetLineFromAddrW64)
{
SymSetOptions(SymGetOptions() | SYMOPT_LOAD_LINES);
if (FALSE != SymInitialize(hProcess, process_path, TRUE))
{
pSym = (PSYMBOL_INFO) zbx_malloc(NULL, sizeof(SYMBOL_INFO) + MAX_SYM_NAME);
memset(pSym, 0, sizeof(SYMBOL_INFO) + MAX_SYM_NAME);
pSym->SizeOfStruct = sizeof(SYMBOL_INFO);
pSym->MaxNameLen = MAX_SYM_NAME;
}
}
scount = s;
ctxcount = ctx;
/* get number of frames, ctxcount may be modified during StackWalk64() calls */
while (TRUE == StackWalk64(ZBX_IMAGE_FILE_MACHINE, hProcess, hThread, &scount, &ctxcount, NULL, NULL, NULL,
NULL))
{
if (0 == scount.AddrReturn.Offset)
break;
nframes++;
}
while (TRUE == StackWalk64(ZBX_IMAGE_FILE_MACHINE, hProcess, hThread, &s, &ctx, NULL, NULL, NULL, NULL))
{
frame_offset = 0;
zbx_snprintf_alloc(&frame, &frame_alloc, &frame_offset, "%d: %s", nframes--,
NULL == process_name ? "(unknown)" : process_name);
if (NULL != pSym)
{
DWORD dwDisplacement;
IMAGEHLP_LINE64 line = {sizeof(IMAGEHLP_LINE64)};
zbx_chrcpy_alloc(&frame, &frame_alloc, &frame_offset, '(');
if (NULL != zbx_SymFromAddr &&
TRUE == zbx_SymFromAddr(hProcess, s.AddrPC.Offset, &offset, pSym))
{
zbx_snprintf_alloc(&frame, &frame_alloc, &frame_offset, "%s+0x%lx", pSym->Name, offset);
}
if (NULL != zbx_SymGetLineFromAddrW64 && TRUE == zbx_SymGetLineFromAddrW64(hProcess,
s.AddrPC.Offset, &dwDisplacement, &line))
{
zbx_snprintf_alloc(&frame, &frame_alloc, &frame_offset, " %s:%d", line.FileName,
line.LineNumber);
}
zbx_chrcpy_alloc(&frame, &frame_alloc, &frame_offset, ')');
}
zabbix_log(LOG_LEVEL_CRIT, "%s [0x%lx]", frame, s.AddrPC.Offset);
if (0 == s.AddrReturn.Offset)
break;
}
SymCleanup(hProcess);
zbx_free(frame);
zbx_free(process_path);
zbx_free(process_name);
zbx_free(pSym);
}
int zbx_win_exception_filter(unsigned int code, struct _EXCEPTION_POINTERS *ep)
{
zabbix_log(LOG_LEVEL_CRIT, "Unhandled exception %x detected at 0x%p. Crashing ...", code,
ep->ExceptionRecord->ExceptionAddress);
print_fatal_info(ep->ContextRecord);
print_backtrace(ep->ContextRecord);
zabbix_log(LOG_LEVEL_CRIT, "================================");
return EXCEPTION_CONTINUE_SEARCH;
}
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