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436 lines
10 KiB
C++
436 lines
10 KiB
C++
/*
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* os_win32/syslog_win32.cpp
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*
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* Home page of code is: http://smartmontools.sourceforge.net
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*
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* Copyright (C) 2004-8 Christian Franke <smartmontools-support@lists.sourceforge.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* You should have received a copy of the GNU General Public License
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* (for example COPYING); if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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// Win32 Emulation of syslog() for smartd
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// Writes to windows event log on NT4/2000/XP
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// (Register syslogevt.exe as event message file)
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// Writes to file "<ident>.log" on 9x/ME.
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// If facility is set to LOG_LOCAL[0-7], log is written to
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// file "<ident>.log", stdout, stderr, "<ident>[1-5].log".
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#include "syslog.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include <errno.h>
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#include <process.h> // getpid()
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h> // RegisterEventSourceA(), ReportEventA(), ...
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const char *syslog_win32_c_cvsid = "$Id: syslog_win32.cpp,v 1.8 2008/03/04 22:09:48 ballen4705 Exp $"
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SYSLOG_H_CVSID;
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#ifdef _MSC_VER
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// MSVC
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#define snprintf _snprintf
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#define vsnprintf _vsnprintf
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#endif
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#define ARGUSED(x) ((void)(x))
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#ifndef _MT
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//MT runtime not necessary, because thread uses no unsafe lib functions
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//#error Program must be linked with multithreaded runtime library
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#endif
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#ifdef TESTEVT
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// Redirect event log to stdout for testing
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static BOOL Test_ReportEventA(HANDLE h, WORD type, WORD cat, DWORD id, PSID usid,
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WORD nstrings, WORD datasize, LPCTSTR * strings, LPVOID data)
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{
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int i;
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printf("%u %lu:%s", type, id, nstrings != 1?"\n":"");
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for (i = 0; i < nstrings; i++)
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printf(" \"%s\"\n", strings[i]);
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fflush(stdout);
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return TRUE;
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}
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HANDLE Test_RegisterEventSourceA(LPCTSTR server, LPCTSTR source)
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{
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return (HANDLE)42;
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}
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#define ReportEventA Test_ReportEventA
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#define RegisterEventSourceA Test_RegisterEventSourceA
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#endif // TESTEVT
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// Event message ids,
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// should be identical to MSG_SYSLOG* in "syslogevt.h"
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// (generated by "mc" from "syslogevt.mc")
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#define MSG_SYSLOG 0x00000000L
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#define MSG_SYSLOG_01 0x00000001L
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// ...
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#define MSG_SYSLOG_10 0x0000000AL
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static char sl_ident[100];
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static char sl_logpath[sizeof(sl_ident) + sizeof("0.log")-1];
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static FILE * sl_logfile;
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static char sl_pidstr[16];
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static HANDLE sl_hevtsrc;
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// Ring buffer for event log output via thread
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#define MAXLINES 10
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#define LINELEN 200
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static HANDLE evt_hthread;
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static char evt_lines[MAXLINES][LINELEN+1];
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static int evt_priorities[MAXLINES];
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static volatile int evt_timeout;
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static int evt_index_in, evt_index_out;
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static HANDLE evt_wait_in, evt_wait_out;
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// Map syslog priority to event type
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static WORD pri2evtype(int priority)
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{
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switch (priority) {
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default:
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case LOG_EMERG: case LOG_ALERT:
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case LOG_CRIT: case LOG_ERR:
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return EVENTLOG_ERROR_TYPE;
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case LOG_WARNING:
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return EVENTLOG_WARNING_TYPE;
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case LOG_NOTICE: case LOG_INFO:
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case LOG_DEBUG:
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return EVENTLOG_INFORMATION_TYPE;
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}
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}
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// Map syslog priority to string
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static const char * pri2text(int priority)
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{
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switch (priority) {
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case LOG_EMERG: return "EMERG";
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case LOG_ALERT: return "ALERT";
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case LOG_CRIT: return "CRIT";
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default:
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case LOG_ERR: return "ERROR";
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case LOG_WARNING: return "Warn";
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case LOG_NOTICE: return "Note";
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case LOG_INFO: return "Info";
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case LOG_DEBUG: return "Debug";
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}
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}
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// Output cnt events from ring buffer
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static void report_events(int cnt)
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{
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const char * msgs[3+MAXLINES];
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int i, pri;
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if (cnt <= 0)
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return;
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if (cnt > MAXLINES)
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cnt = MAXLINES;
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pri = evt_priorities[evt_index_out];
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msgs[0] = sl_ident;
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msgs[1] = sl_pidstr;
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msgs[2] = pri2text(pri);
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for (i = 0; i < cnt; i++) {
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//assert(evt_priorities[evt_index_out] == pri);
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msgs[3+i] = evt_lines[evt_index_out];
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if (++evt_index_out >= MAXLINES)
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evt_index_out = 0;
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}
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ReportEventA(sl_hevtsrc,
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pri2evtype(pri), // type
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0, MSG_SYSLOG+cnt, // category, message id
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NULL, // no security id
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(WORD)(3+cnt), 0, // 3+cnt strings, ...
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msgs, NULL); // ... , no data
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}
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// Thread to combine several syslog lines into one event log entry
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static ULONG WINAPI event_logger_thread(LPVOID arg)
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{
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int cnt;
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ARGUSED(arg);
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cnt = 0;
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for (;;) {
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// Wait for first line ...
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int prior, i, rest;
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if (cnt == 0) {
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if (WaitForSingleObject(evt_wait_out, (evt_timeout? INFINITE : 0)) != WAIT_OBJECT_0)
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break;
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cnt = 1;
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}
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// ... wait some time for more lines with same prior
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i = evt_index_out;
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prior = evt_priorities[i];
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rest = 0;
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while (cnt < MAXLINES) {
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long timeout =
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evt_timeout * ((1000L * (MAXLINES-cnt+1))/MAXLINES);
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if (WaitForSingleObject(evt_wait_out, timeout) != WAIT_OBJECT_0)
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break;
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if (++i >= MAXLINES)
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i = 0;
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if (evt_priorities[i] != prior) {
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rest = 1;
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break;
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}
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cnt++;
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}
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// Output all in one event log entry
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report_events(cnt);
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// Signal space
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if (!ReleaseSemaphore(evt_wait_in, cnt, NULL))
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break;
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cnt = rest;
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}
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return 0;
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}
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static void on_exit_event_logger(void)
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{
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// Output lines immediate if exiting
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evt_timeout = 0;
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// Wait for thread to finish
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WaitForSingleObject(evt_hthread, 1000L);
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CloseHandle(evt_hthread);
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#if 0
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if (sl_hevtsrc) {
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DeregisterEventSource(sl_hevtsrc); sl_hevtsrc = 0;
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}
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#else
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// Leave event message source open to prevent losing messages during shutdown
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#endif
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}
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static int start_event_logger()
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{
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DWORD tid;
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evt_timeout = 1;
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if ( !(evt_wait_in = CreateSemaphore(NULL, MAXLINES, MAXLINES, NULL))
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|| !(evt_wait_out = CreateSemaphore(NULL, 0, MAXLINES, NULL))) {
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fprintf(stderr,"CreateSemaphore failed, Error=%ld\n", GetLastError());
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return -1;
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}
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if (!(evt_hthread = CreateThread(NULL, 0, event_logger_thread, NULL, 0, &tid))) {
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fprintf(stderr,"CreateThread failed, Error=%ld\n", GetLastError());
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return -1;
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}
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atexit(on_exit_event_logger);
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return 0;
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}
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// Write lines to event log ring buffer
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static void write_event_log(int priority, const char * lines)
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{
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int cnt = 0;
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int i;
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for (i = 0; lines[i]; i++) {
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int len = 0;
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while (lines[i+len] && lines[i+len] != '\n')
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len++;
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;
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if (len > 0) {
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// Wait for space
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if (WaitForSingleObject(evt_wait_in, INFINITE) != WAIT_OBJECT_0)
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return;
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// Copy line
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evt_priorities[evt_index_in] = priority;
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memcpy(evt_lines[evt_index_in], lines+i, (len < LINELEN ? len : LINELEN));
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if (len < LINELEN)
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evt_lines[evt_index_in][len] = 0;
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if (++evt_index_in >= MAXLINES)
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evt_index_in = 0;
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// Signal avail if ring buffer full
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if (++cnt >= MAXLINES) {
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ReleaseSemaphore(evt_wait_out, cnt, NULL);
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cnt = 0;
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}
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i += len;
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}
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if (!lines[i])
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break;
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}
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// Signal avail
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if (cnt > 0)
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ReleaseSemaphore(evt_wait_out, cnt, NULL);
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Sleep(1);
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}
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// Write lines to logfile
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static void write_logfile(FILE * f, int priority, const char * lines)
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{
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time_t now; char stamp[sizeof("2004-04-04 10:00:00")+13];
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int i;
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now = time((time_t*)0);
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if (!strftime(stamp, sizeof(stamp)-1, "%Y-%m-%d %H:%M:%S", localtime(&now)))
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strcpy(stamp,"?");
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for (i = 0; lines[i]; i++) {
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int len = 0;
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while (lines[i+len] && lines[i+len] != '\n')
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len++;
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if (len > 0) {
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fprintf(f, "%s %s[%s]: %-5s: ",
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stamp, sl_ident, sl_pidstr, pri2text(priority));
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fwrite(lines+i, len, 1, f);
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fputc('\n', f);
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i += len;
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}
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if (!lines[i])
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break;
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}
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}
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void openlog(const char *ident, int logopt, int facility)
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{
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int pid;
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if (sl_logpath[0] || sl_logfile || sl_hevtsrc)
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return; // Already open
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strncpy(sl_ident, ident, sizeof(sl_ident)-1);
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// logopt==LOG_PID assumed
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ARGUSED(logopt);
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pid = getpid();
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if (snprintf(sl_pidstr, sizeof(sl_pidstr)-1, (pid >= 0 ? "%d" : "0x%X"), pid) < 0)
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strcpy(sl_pidstr,"?");
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if (facility == LOG_LOCAL0) // "ident.log"
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strcat(strcpy(sl_logpath, sl_ident), ".log");
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else if (facility == LOG_LOCAL1) // stdout
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sl_logfile = stdout;
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else if (facility == LOG_LOCAL2) // stderr
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sl_logfile = stderr;
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else if (LOG_LOCAL2 < facility && facility <= LOG_LOCAL7) { // "ident[1-5].log"
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snprintf(sl_logpath, sizeof(sl_logpath)-1, "%s%d.log",
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sl_ident, LOG_FAC(facility)-LOG_FAC(LOG_LOCAL2));
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}
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else // Assume LOG_DAEMON, use event log if possible, else "ident.log"
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if (!(sl_hevtsrc = RegisterEventSourceA(NULL/*localhost*/, sl_ident))) {
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// Cannot open => Use logfile
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long err = GetLastError();
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strcat(strcpy(sl_logpath, sl_ident), ".log");
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if (GetVersion() & 0x80000000)
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fprintf(stderr, "%s: No event log on Win9x/ME, writing to %s\n",
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sl_ident, sl_logpath);
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else
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fprintf(stderr, "%s: Cannot register event source (Error=%ld), writing to %s\n",
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sl_ident, err, sl_logpath);
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}
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else {
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// Start event log thread
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start_event_logger();
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}
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//assert(sl_logpath[0] || sl_logfile || sl_hevtsrc);
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}
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void closelog()
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{
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}
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void vsyslog(int priority, const char * message, va_list args)
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{
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char buffer[1000];
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// Translation of %m to error text not supported yet
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if (strstr(message, "%m"))
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message = "Internal error: \"%%m\" in log message";
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// Format message
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if (vsnprintf(buffer, sizeof(buffer)-1, message, args) < 0)
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strcpy(buffer, "Internal Error: buffer overflow");
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if (sl_hevtsrc) {
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// Write to event log
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write_event_log(priority, buffer);
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}
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else if (sl_logfile) {
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// Write to stdout/err
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write_logfile(sl_logfile, priority, buffer);
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fflush(sl_logfile);
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}
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else if (sl_logpath[0]) {
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// Append to logfile
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FILE * f;
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if (!(f = fopen(sl_logpath, "a")))
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return;
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write_logfile(f, priority, buffer);
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fclose(f);
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}
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}
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#ifdef TEST
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// Test program
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void syslog(int priority, const char *message, ...)
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{
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va_list args;
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va_start(args, message);
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vsyslog(priority, message, args);
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va_end(args);
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}
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int main(int argc, char* argv[])
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{
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int i;
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openlog(argc < 2 ? "test" : argv[1], LOG_PID, (argc < 3 ? LOG_DAEMON : LOG_LOCAL1));
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syslog(LOG_INFO, "Info\n");
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syslog(LOG_WARNING, "Warning %d\n\n", 42);
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syslog(LOG_ERR, "Error %s", "Fatal");
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for (i = 0; i < 100; i++) {
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char buf[LINELEN];
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if (i % 13 == 0)
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Sleep(1000L);
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sprintf(buf, "Log Line %d\n", i);
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syslog(i % 17 ? LOG_INFO : LOG_ERR, buf);
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}
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closelog();
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return 0;
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}
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#endif
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