/*
* os_win32/syslog_win32.cpp
*
* Home page of code is: http://smartmontools.sourceforge.net
*
* Copyright (C) 2004-12 Christian Franke <smartmontools-support@lists.sourceforge.net>
*
* 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, or (at your option)
* any later version.
*
* You should have received a copy of the GNU General Public License
* (for example COPYING); If not, see <http://www.gnu.org/licenses/>.
*
*/
// Win32 Emulation of syslog() for smartd
// Writes to windows event log on NT4/2000/XP
// (Register syslogevt.exe as event message file)
// If facility is set to LOG_LOCAL[0-7], log is written to
// file "<ident>.log", stdout, stderr, "<ident>[1-5].log".
#include "syslog.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <process.h> // getpid()
#define WIN32_LEAN_AND_MEAN
#include <windows.h> // RegisterEventSourceA(), ReportEventA(), ...
const char *syslog_win32_cpp_cvsid = "$Id: syslog_win32.cpp,v 1.1.1.2 2013/07/22 01:17:36 misho Exp $"
SYSLOG_H_CVSID;
#ifdef _MSC_VER
// MSVC
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#endif
#define ARGUSED(x) ((void)(x))
#ifndef _MT
//MT runtime not necessary, because thread uses no unsafe lib functions
//#error Program must be linked with multithreaded runtime library
#endif
#ifdef TESTEVT
// Redirect event log to stdout for testing
static BOOL Test_ReportEventA(HANDLE h, WORD type, WORD cat, DWORD id, PSID usid,
WORD nstrings, WORD datasize, LPCTSTR * strings, LPVOID data)
{
int i;
printf("%u %lu:%s", type, id, nstrings != 1?"\n":"");
for (i = 0; i < nstrings; i++)
printf(" \"%s\"\n", strings[i]);
fflush(stdout);
return TRUE;
}
HANDLE Test_RegisterEventSourceA(LPCTSTR server, LPCTSTR source)
{
return (HANDLE)42;
}
#define ReportEventA Test_ReportEventA
#define RegisterEventSourceA Test_RegisterEventSourceA
#endif // TESTEVT
// Event message ids,
// should be identical to MSG_SYSLOG* in "syslogevt.h"
// (generated by "mc" from "syslogevt.mc")
#define MSG_SYSLOG 0x00000000L
#define MSG_SYSLOG_01 0x00000001L
// ...
#define MSG_SYSLOG_10 0x0000000AL
static char sl_ident[100];
static char sl_logpath[sizeof(sl_ident) + sizeof("0.log")-1];
static FILE * sl_logfile;
static char sl_pidstr[16];
static HANDLE sl_hevtsrc;
// Ring buffer for event log output via thread
#define MAXLINES 10
#define LINELEN 200
static HANDLE evt_hthread;
static char evt_lines[MAXLINES][LINELEN+1];
static int evt_priorities[MAXLINES];
static volatile int evt_timeout;
static int evt_index_in, evt_index_out;
static HANDLE evt_wait_in, evt_wait_out;
// Map syslog priority to event type
static WORD pri2evtype(int priority)
{
switch (priority) {
default:
case LOG_EMERG: case LOG_ALERT:
case LOG_CRIT: case LOG_ERR:
return EVENTLOG_ERROR_TYPE;
case LOG_WARNING:
return EVENTLOG_WARNING_TYPE;
case LOG_NOTICE: case LOG_INFO:
case LOG_DEBUG:
return EVENTLOG_INFORMATION_TYPE;
}
}
// Map syslog priority to string
static const char * pri2text(int priority)
{
switch (priority) {
case LOG_EMERG: return "EMERG";
case LOG_ALERT: return "ALERT";
case LOG_CRIT: return "CRIT";
default:
case LOG_ERR: return "ERROR";
case LOG_WARNING: return "Warn";
case LOG_NOTICE: return "Note";
case LOG_INFO: return "Info";
case LOG_DEBUG: return "Debug";
}
}
// Output cnt events from ring buffer
static void report_events(int cnt)
{
const char * msgs[3+MAXLINES];
int i, pri;
if (cnt <= 0)
return;
if (cnt > MAXLINES)
cnt = MAXLINES;
pri = evt_priorities[evt_index_out];
msgs[0] = sl_ident;
msgs[1] = sl_pidstr;
msgs[2] = pri2text(pri);
for (i = 0; i < cnt; i++) {
//assert(evt_priorities[evt_index_out] == pri);
msgs[3+i] = evt_lines[evt_index_out];
if (++evt_index_out >= MAXLINES)
evt_index_out = 0;
}
ReportEventA(sl_hevtsrc,
pri2evtype(pri), // type
0, MSG_SYSLOG+cnt, // category, message id
NULL, // no security id
(WORD)(3+cnt), 0, // 3+cnt strings, ...
msgs, NULL); // ... , no data
}
// Thread to combine several syslog lines into one event log entry
static ULONG WINAPI event_logger_thread(LPVOID arg)
{
int cnt;
ARGUSED(arg);
cnt = 0;
for (;;) {
// Wait for first line ...
int prior, i, rest;
if (cnt == 0) {
if (WaitForSingleObject(evt_wait_out, (evt_timeout? INFINITE : 0)) != WAIT_OBJECT_0)
break;
cnt = 1;
}
// ... wait some time for more lines with same prior
i = evt_index_out;
prior = evt_priorities[i];
rest = 0;
while (cnt < MAXLINES) {
long timeout =
evt_timeout * ((1000L * (MAXLINES-cnt+1))/MAXLINES);
if (WaitForSingleObject(evt_wait_out, timeout) != WAIT_OBJECT_0)
break;
if (++i >= MAXLINES)
i = 0;
if (evt_priorities[i] != prior) {
rest = 1;
break;
}
cnt++;
}
// Output all in one event log entry
report_events(cnt);
// Signal space
if (!ReleaseSemaphore(evt_wait_in, cnt, NULL))
break;
cnt = rest;
}
return 0;
}
static void on_exit_event_logger(void)
{
// Output lines immediate if exiting
evt_timeout = 0;
// Wait for thread to finish
WaitForSingleObject(evt_hthread, 1000L);
CloseHandle(evt_hthread);
#if 0
if (sl_hevtsrc) {
DeregisterEventSource(sl_hevtsrc); sl_hevtsrc = 0;
}
#else
// Leave event message source open to prevent losing messages during shutdown
#endif
}
static int start_event_logger()
{
DWORD tid;
evt_timeout = 1;
if ( !(evt_wait_in = CreateSemaphore(NULL, MAXLINES, MAXLINES, NULL))
|| !(evt_wait_out = CreateSemaphore(NULL, 0, MAXLINES, NULL))) {
fprintf(stderr,"CreateSemaphore failed, Error=%ld\n", GetLastError());
return -1;
}
if (!(evt_hthread = CreateThread(NULL, 0, event_logger_thread, NULL, 0, &tid))) {
fprintf(stderr,"CreateThread failed, Error=%ld\n", GetLastError());
return -1;
}
atexit(on_exit_event_logger);
return 0;
}
// Write lines to event log ring buffer
static void write_event_log(int priority, const char * lines)
{
int cnt = 0;
int i;
for (i = 0; lines[i]; i++) {
int len = 0;
while (lines[i+len] && lines[i+len] != '\n')
len++;
;
if (len > 0) {
// Wait for space
if (WaitForSingleObject(evt_wait_in, INFINITE) != WAIT_OBJECT_0)
return;
// Copy line
evt_priorities[evt_index_in] = priority;
memcpy(evt_lines[evt_index_in], lines+i, (len < LINELEN ? len : LINELEN));
if (len < LINELEN)
evt_lines[evt_index_in][len] = 0;
if (++evt_index_in >= MAXLINES)
evt_index_in = 0;
// Signal avail if ring buffer full
if (++cnt >= MAXLINES) {
ReleaseSemaphore(evt_wait_out, cnt, NULL);
cnt = 0;
}
i += len;
}
if (!lines[i])
break;
}
// Signal avail
if (cnt > 0)
ReleaseSemaphore(evt_wait_out, cnt, NULL);
Sleep(1);
}
// Write lines to logfile
static void write_logfile(FILE * f, int priority, const char * lines)
{
time_t now; char stamp[sizeof("2004-04-04 10:00:00")+13];
int i;
now = time((time_t*)0);
if (!strftime(stamp, sizeof(stamp)-1, "%Y-%m-%d %H:%M:%S", localtime(&now)))
strcpy(stamp,"?");
for (i = 0; lines[i]; i++) {
int len = 0;
while (lines[i+len] && lines[i+len] != '\n')
len++;
if (len > 0) {
fprintf(f, "%s %s[%s]: %-5s: ",
stamp, sl_ident, sl_pidstr, pri2text(priority));
fwrite(lines+i, len, 1, f);
fputc('\n', f);
i += len;
}
if (!lines[i])
break;
}
}
void openlog(const char *ident, int logopt, int facility)
{
int pid;
if (sl_logpath[0] || sl_logfile || sl_hevtsrc)
return; // Already open
strncpy(sl_ident, ident, sizeof(sl_ident)-1);
// logopt==LOG_PID assumed
ARGUSED(logopt);
pid = getpid();
if (snprintf(sl_pidstr, sizeof(sl_pidstr)-1, (pid >= 0 ? "%d" : "0x%X"), pid) < 0)
strcpy(sl_pidstr,"?");
if (facility == LOG_LOCAL0) // "ident.log"
strcat(strcpy(sl_logpath, sl_ident), ".log");
else if (facility == LOG_LOCAL1) // stdout
sl_logfile = stdout;
else if (facility == LOG_LOCAL2) // stderr
sl_logfile = stderr;
else if (LOG_LOCAL2 < facility && facility <= LOG_LOCAL7) { // "ident[1-5].log"
snprintf(sl_logpath, sizeof(sl_logpath)-1, "%s%d.log",
sl_ident, LOG_FAC(facility)-LOG_FAC(LOG_LOCAL2));
}
else // Assume LOG_DAEMON, use event log if possible, else "ident.log"
if (!(sl_hevtsrc = RegisterEventSourceA(NULL/*localhost*/, sl_ident))) {
// Cannot open => Use logfile
long err = GetLastError();
strcat(strcpy(sl_logpath, sl_ident), ".log");
fprintf(stderr, "%s: Cannot register event source (Error=%ld), writing to %s\n",
sl_ident, err, sl_logpath);
}
else {
// Start event log thread
start_event_logger();
}
//assert(sl_logpath[0] || sl_logfile || sl_hevtsrc);
}
void closelog()
{
}
void vsyslog(int priority, const char * message, va_list args)
{
char buffer[1000];
// Translation of %m to error text not supported yet
if (strstr(message, "%m"))
message = "Internal error: \"%%m\" in log message";
// Format message
if (vsnprintf(buffer, sizeof(buffer)-1, message, args) < 0)
strcpy(buffer, "Internal Error: buffer overflow");
if (sl_hevtsrc) {
// Write to event log
write_event_log(priority, buffer);
}
else if (sl_logfile) {
// Write to stdout/err
write_logfile(sl_logfile, priority, buffer);
fflush(sl_logfile);
}
else if (sl_logpath[0]) {
// Append to logfile
FILE * f;
if (!(f = fopen(sl_logpath, "a")))
return;
write_logfile(f, priority, buffer);
fclose(f);
}
}
#ifdef TEST
// Test program
void syslog(int priority, const char *message, ...)
{
va_list args;
va_start(args, message);
vsyslog(priority, message, args);
va_end(args);
}
int main(int argc, char* argv[])
{
int i;
openlog(argc < 2 ? "test" : argv[1], LOG_PID, (argc < 3 ? LOG_DAEMON : LOG_LOCAL1));
syslog(LOG_INFO, "Info\n");
syslog(LOG_WARNING, "Warning %d\n\n", 42);
syslog(LOG_ERR, "Error %s", "Fatal");
for (i = 0; i < 100; i++) {
char buf[LINELEN];
if (i % 13 == 0)
Sleep(1000L);
sprintf(buf, "Log Line %d\n", i);
syslog(i % 17 ? LOG_INFO : LOG_ERR, buf);
}
closelog();
return 0;
}
#endif
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to syslog_win32.cpp CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / smartmontools / os_win32