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1.1 misho 1: /*
2: * os_win32/syslog_win32.cpp
3: *
4: * Home page of code is: http://smartmontools.sourceforge.net
5: *
6: * Copyright (C) 2004-8 Christian Franke <smartmontools-support@lists.sourceforge.net>
7: *
8: * This program is free software; you can redistribute it and/or modify
9: * it under the terms of the GNU General Public License as published by
10: * the Free Software Foundation; either version 2, or (at your option)
11: * any later version.
12: *
13: * You should have received a copy of the GNU General Public License
14: * (for example COPYING); if not, write to the Free
15: * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16: *
17: */
18:
19: // Win32 Emulation of syslog() for smartd
20: // Writes to windows event log on NT4/2000/XP
21: // (Register syslogevt.exe as event message file)
22: // Writes to file "<ident>.log" on 9x/ME.
23: // If facility is set to LOG_LOCAL[0-7], log is written to
24: // file "<ident>.log", stdout, stderr, "<ident>[1-5].log".
25:
26:
27: #include "syslog.h"
28:
29: #include <stdlib.h>
30: #include <stdio.h>
31: #include <time.h>
32: #include <errno.h>
33: #include <process.h> // getpid()
34:
35: #define WIN32_LEAN_AND_MEAN
36: #include <windows.h> // RegisterEventSourceA(), ReportEventA(), ...
37:
38: const char *syslog_win32_c_cvsid = "$Id: syslog_win32.cpp,v 1.8 2008/03/04 22:09:48 ballen4705 Exp $"
39: SYSLOG_H_CVSID;
40:
41: #ifdef _MSC_VER
42: // MSVC
43: #define snprintf _snprintf
44: #define vsnprintf _vsnprintf
45: #endif
46:
47: #define ARGUSED(x) ((void)(x))
48:
49:
50: #ifndef _MT
51: //MT runtime not necessary, because thread uses no unsafe lib functions
52: //#error Program must be linked with multithreaded runtime library
53: #endif
54:
55:
56: #ifdef TESTEVT
57: // Redirect event log to stdout for testing
58:
59: static BOOL Test_ReportEventA(HANDLE h, WORD type, WORD cat, DWORD id, PSID usid,
60: WORD nstrings, WORD datasize, LPCTSTR * strings, LPVOID data)
61: {
62: int i;
63: printf("%u %lu:%s", type, id, nstrings != 1?"\n":"");
64: for (i = 0; i < nstrings; i++)
65: printf(" \"%s\"\n", strings[i]);
66: fflush(stdout);
67: return TRUE;
68: }
69:
70: HANDLE Test_RegisterEventSourceA(LPCTSTR server, LPCTSTR source)
71: {
72: return (HANDLE)42;
73: }
74:
75: #define ReportEventA Test_ReportEventA
76: #define RegisterEventSourceA Test_RegisterEventSourceA
77: #endif // TESTEVT
78:
79:
80: // Event message ids,
81: // should be identical to MSG_SYSLOG* in "syslogevt.h"
82: // (generated by "mc" from "syslogevt.mc")
83: #define MSG_SYSLOG 0x00000000L
84: #define MSG_SYSLOG_01 0x00000001L
85: // ...
86: #define MSG_SYSLOG_10 0x0000000AL
87:
88: static char sl_ident[100];
89: static char sl_logpath[sizeof(sl_ident) + sizeof("0.log")-1];
90: static FILE * sl_logfile;
91: static char sl_pidstr[16];
92: static HANDLE sl_hevtsrc;
93:
94:
95: // Ring buffer for event log output via thread
96: #define MAXLINES 10
97: #define LINELEN 200
98:
99: static HANDLE evt_hthread;
100: static char evt_lines[MAXLINES][LINELEN+1];
101: static int evt_priorities[MAXLINES];
102: static volatile int evt_timeout;
103: static int evt_index_in, evt_index_out;
104: static HANDLE evt_wait_in, evt_wait_out;
105:
106:
107: // Map syslog priority to event type
108:
109: static WORD pri2evtype(int priority)
110: {
111: switch (priority) {
112: default:
113: case LOG_EMERG: case LOG_ALERT:
114: case LOG_CRIT: case LOG_ERR:
115: return EVENTLOG_ERROR_TYPE;
116: case LOG_WARNING:
117: return EVENTLOG_WARNING_TYPE;
118: case LOG_NOTICE: case LOG_INFO:
119: case LOG_DEBUG:
120: return EVENTLOG_INFORMATION_TYPE;
121: }
122: }
123:
124:
125: // Map syslog priority to string
126:
127: static const char * pri2text(int priority)
128: {
129: switch (priority) {
130: case LOG_EMERG: return "EMERG";
131: case LOG_ALERT: return "ALERT";
132: case LOG_CRIT: return "CRIT";
133: default:
134: case LOG_ERR: return "ERROR";
135: case LOG_WARNING: return "Warn";
136: case LOG_NOTICE: return "Note";
137: case LOG_INFO: return "Info";
138: case LOG_DEBUG: return "Debug";
139: }
140: }
141:
142:
143: // Output cnt events from ring buffer
144:
145: static void report_events(int cnt)
146: {
147: const char * msgs[3+MAXLINES];
148:
149: int i, pri;
150: if (cnt <= 0)
151: return;
152: if (cnt > MAXLINES)
153: cnt = MAXLINES;
154:
155: pri = evt_priorities[evt_index_out];
156:
157: msgs[0] = sl_ident;
158: msgs[1] = sl_pidstr;
159: msgs[2] = pri2text(pri);
160: for (i = 0; i < cnt; i++) {
161: //assert(evt_priorities[evt_index_out] == pri);
162: msgs[3+i] = evt_lines[evt_index_out];
163: if (++evt_index_out >= MAXLINES)
164: evt_index_out = 0;
165: }
166: ReportEventA(sl_hevtsrc,
167: pri2evtype(pri), // type
168: 0, MSG_SYSLOG+cnt, // category, message id
169: NULL, // no security id
170: (WORD)(3+cnt), 0, // 3+cnt strings, ...
171: msgs, NULL); // ... , no data
172: }
173:
174:
175: // Thread to combine several syslog lines into one event log entry
176:
177: static ULONG WINAPI event_logger_thread(LPVOID arg)
178: {
179: int cnt;
180: ARGUSED(arg);
181:
182: cnt = 0;
183: for (;;) {
184: // Wait for first line ...
185: int prior, i, rest;
186: if (cnt == 0) {
187: if (WaitForSingleObject(evt_wait_out, (evt_timeout? INFINITE : 0)) != WAIT_OBJECT_0)
188: break;
189: cnt = 1;
190: }
191:
192: // ... wait some time for more lines with same prior
193: i = evt_index_out;
194: prior = evt_priorities[i];
195: rest = 0;
196: while (cnt < MAXLINES) {
197: long timeout =
198: evt_timeout * ((1000L * (MAXLINES-cnt+1))/MAXLINES);
199: if (WaitForSingleObject(evt_wait_out, timeout) != WAIT_OBJECT_0)
200: break;
201: if (++i >= MAXLINES)
202: i = 0;
203: if (evt_priorities[i] != prior) {
204: rest = 1;
205: break;
206: }
207: cnt++;
208: }
209:
210: // Output all in one event log entry
211: report_events(cnt);
212:
213: // Signal space
214: if (!ReleaseSemaphore(evt_wait_in, cnt, NULL))
215: break;
216: cnt = rest;
217: }
218: return 0;
219: }
220:
221:
222: static void on_exit_event_logger(void)
223: {
224: // Output lines immediate if exiting
225: evt_timeout = 0;
226: // Wait for thread to finish
227: WaitForSingleObject(evt_hthread, 1000L);
228: CloseHandle(evt_hthread);
229: #if 0
230: if (sl_hevtsrc) {
231: DeregisterEventSource(sl_hevtsrc); sl_hevtsrc = 0;
232: }
233: #else
234: // Leave event message source open to prevent losing messages during shutdown
235: #endif
236: }
237:
238:
239: static int start_event_logger()
240: {
241: DWORD tid;
242: evt_timeout = 1;
243: if ( !(evt_wait_in = CreateSemaphore(NULL, MAXLINES, MAXLINES, NULL))
244: || !(evt_wait_out = CreateSemaphore(NULL, 0, MAXLINES, NULL))) {
245: fprintf(stderr,"CreateSemaphore failed, Error=%ld\n", GetLastError());
246: return -1;
247: }
248: if (!(evt_hthread = CreateThread(NULL, 0, event_logger_thread, NULL, 0, &tid))) {
249: fprintf(stderr,"CreateThread failed, Error=%ld\n", GetLastError());
250: return -1;
251: }
252: atexit(on_exit_event_logger);
253: return 0;
254: }
255:
256:
257: // Write lines to event log ring buffer
258:
259: static void write_event_log(int priority, const char * lines)
260: {
261: int cnt = 0;
262: int i;
263: for (i = 0; lines[i]; i++) {
264: int len = 0;
265: while (lines[i+len] && lines[i+len] != '\n')
266: len++;
267: ;
268: if (len > 0) {
269: // Wait for space
270: if (WaitForSingleObject(evt_wait_in, INFINITE) != WAIT_OBJECT_0)
271: return;
272: // Copy line
273: evt_priorities[evt_index_in] = priority;
274: memcpy(evt_lines[evt_index_in], lines+i, (len < LINELEN ? len : LINELEN));
275: if (len < LINELEN)
276: evt_lines[evt_index_in][len] = 0;
277: if (++evt_index_in >= MAXLINES)
278: evt_index_in = 0;
279: // Signal avail if ring buffer full
280: if (++cnt >= MAXLINES) {
281: ReleaseSemaphore(evt_wait_out, cnt, NULL);
282: cnt = 0;
283: }
284: i += len;
285: }
286: if (!lines[i])
287: break;
288: }
289:
290: // Signal avail
291: if (cnt > 0)
292: ReleaseSemaphore(evt_wait_out, cnt, NULL);
293: Sleep(1);
294: }
295:
296:
297: // Write lines to logfile
298:
299: static void write_logfile(FILE * f, int priority, const char * lines)
300: {
301: time_t now; char stamp[sizeof("2004-04-04 10:00:00")+13];
302: int i;
303:
304: now = time((time_t*)0);
305: if (!strftime(stamp, sizeof(stamp)-1, "%Y-%m-%d %H:%M:%S", localtime(&now)))
306: strcpy(stamp,"?");
307:
308: for (i = 0; lines[i]; i++) {
309: int len = 0;
310: while (lines[i+len] && lines[i+len] != '\n')
311: len++;
312: if (len > 0) {
313: fprintf(f, "%s %s[%s]: %-5s: ",
314: stamp, sl_ident, sl_pidstr, pri2text(priority));
315: fwrite(lines+i, len, 1, f);
316: fputc('\n', f);
317: i += len;
318: }
319: if (!lines[i])
320: break;
321: }
322: }
323:
324:
325: void openlog(const char *ident, int logopt, int facility)
326: {
327: int pid;
328: if (sl_logpath[0] || sl_logfile || sl_hevtsrc)
329: return; // Already open
330:
331: strncpy(sl_ident, ident, sizeof(sl_ident)-1);
332: // logopt==LOG_PID assumed
333: ARGUSED(logopt);
334: pid = getpid();
335: if (snprintf(sl_pidstr, sizeof(sl_pidstr)-1, (pid >= 0 ? "%d" : "0x%X"), pid) < 0)
336: strcpy(sl_pidstr,"?");
337:
338: if (facility == LOG_LOCAL0) // "ident.log"
339: strcat(strcpy(sl_logpath, sl_ident), ".log");
340: else if (facility == LOG_LOCAL1) // stdout
341: sl_logfile = stdout;
342: else if (facility == LOG_LOCAL2) // stderr
343: sl_logfile = stderr;
344: else if (LOG_LOCAL2 < facility && facility <= LOG_LOCAL7) { // "ident[1-5].log"
345: snprintf(sl_logpath, sizeof(sl_logpath)-1, "%s%d.log",
346: sl_ident, LOG_FAC(facility)-LOG_FAC(LOG_LOCAL2));
347: }
348: else // Assume LOG_DAEMON, use event log if possible, else "ident.log"
349: if (!(sl_hevtsrc = RegisterEventSourceA(NULL/*localhost*/, sl_ident))) {
350: // Cannot open => Use logfile
351: long err = GetLastError();
352: strcat(strcpy(sl_logpath, sl_ident), ".log");
353: if (GetVersion() & 0x80000000)
354: fprintf(stderr, "%s: No event log on Win9x/ME, writing to %s\n",
355: sl_ident, sl_logpath);
356: else
357: fprintf(stderr, "%s: Cannot register event source (Error=%ld), writing to %s\n",
358: sl_ident, err, sl_logpath);
359: }
360: else {
361: // Start event log thread
362: start_event_logger();
363: }
364: //assert(sl_logpath[0] || sl_logfile || sl_hevtsrc);
365:
366: }
367:
368:
369: void closelog()
370: {
371: }
372:
373:
374: void vsyslog(int priority, const char * message, va_list args)
375: {
376: char buffer[1000];
377:
378: // Translation of %m to error text not supported yet
379: if (strstr(message, "%m"))
380: message = "Internal error: \"%%m\" in log message";
381:
382: // Format message
383: if (vsnprintf(buffer, sizeof(buffer)-1, message, args) < 0)
384: strcpy(buffer, "Internal Error: buffer overflow");
385:
386: if (sl_hevtsrc) {
387: // Write to event log
388: write_event_log(priority, buffer);
389: }
390: else if (sl_logfile) {
391: // Write to stdout/err
392: write_logfile(sl_logfile, priority, buffer);
393: fflush(sl_logfile);
394: }
395: else if (sl_logpath[0]) {
396: // Append to logfile
397: FILE * f;
398: if (!(f = fopen(sl_logpath, "a")))
399: return;
400: write_logfile(f, priority, buffer);
401: fclose(f);
402: }
403: }
404:
405:
406: #ifdef TEST
407: // Test program
408:
409: void syslog(int priority, const char *message, ...)
410: {
411: va_list args;
412: va_start(args, message);
413: vsyslog(priority, message, args);
414: va_end(args);
415: }
416:
417: int main(int argc, char* argv[])
418: {
419: int i;
420: openlog(argc < 2 ? "test" : argv[1], LOG_PID, (argc < 3 ? LOG_DAEMON : LOG_LOCAL1));
421: syslog(LOG_INFO, "Info\n");
422: syslog(LOG_WARNING, "Warning %d\n\n", 42);
423: syslog(LOG_ERR, "Error %s", "Fatal");
424: for (i = 0; i < 100; i++) {
425: char buf[LINELEN];
426: if (i % 13 == 0)
427: Sleep(1000L);
428: sprintf(buf, "Log Line %d\n", i);
429: syslog(i % 17 ? LOG_INFO : LOG_ERR, buf);
430: }
431: closelog();
432: return 0;
433: }
434:
435: #endif