1: /*
2: * os_win32/syslog_win32.cpp
3: *
4: * Home page of code is: http://smartmontools.sourceforge.net
5: *
6: * Copyright (C) 2004-12 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, see <http://www.gnu.org/licenses/>.
15: *
16: */
17:
18: // Win32 Emulation of syslog() for smartd
19: // Writes to windows event log on NT4/2000/XP
20: // (Register syslogevt.exe as event message file)
21: // If facility is set to LOG_LOCAL[0-7], log is written to
22: // file "<ident>.log", stdout, stderr, "<ident>[1-5].log".
23:
24:
25: #include "syslog.h"
26:
27: #include <stdlib.h>
28: #include <stdio.h>
29: #include <time.h>
30: #include <errno.h>
31: #include <process.h> // getpid()
32:
33: #define WIN32_LEAN_AND_MEAN
34: #include <windows.h> // RegisterEventSourceA(), ReportEventA(), ...
35:
36: const char *syslog_win32_cpp_cvsid = "$Id: syslog_win32.cpp,v 1.1.1.2 2013/07/22 01:17:36 misho Exp $"
37: SYSLOG_H_CVSID;
38:
39: #ifdef _MSC_VER
40: // MSVC
41: #define snprintf _snprintf
42: #define vsnprintf _vsnprintf
43: #endif
44:
45: #define ARGUSED(x) ((void)(x))
46:
47:
48: #ifndef _MT
49: //MT runtime not necessary, because thread uses no unsafe lib functions
50: //#error Program must be linked with multithreaded runtime library
51: #endif
52:
53:
54: #ifdef TESTEVT
55: // Redirect event log to stdout for testing
56:
57: static BOOL Test_ReportEventA(HANDLE h, WORD type, WORD cat, DWORD id, PSID usid,
58: WORD nstrings, WORD datasize, LPCTSTR * strings, LPVOID data)
59: {
60: int i;
61: printf("%u %lu:%s", type, id, nstrings != 1?"\n":"");
62: for (i = 0; i < nstrings; i++)
63: printf(" \"%s\"\n", strings[i]);
64: fflush(stdout);
65: return TRUE;
66: }
67:
68: HANDLE Test_RegisterEventSourceA(LPCTSTR server, LPCTSTR source)
69: {
70: return (HANDLE)42;
71: }
72:
73: #define ReportEventA Test_ReportEventA
74: #define RegisterEventSourceA Test_RegisterEventSourceA
75: #endif // TESTEVT
76:
77:
78: // Event message ids,
79: // should be identical to MSG_SYSLOG* in "syslogevt.h"
80: // (generated by "mc" from "syslogevt.mc")
81: #define MSG_SYSLOG 0x00000000L
82: #define MSG_SYSLOG_01 0x00000001L
83: // ...
84: #define MSG_SYSLOG_10 0x0000000AL
85:
86: static char sl_ident[100];
87: static char sl_logpath[sizeof(sl_ident) + sizeof("0.log")-1];
88: static FILE * sl_logfile;
89: static char sl_pidstr[16];
90: static HANDLE sl_hevtsrc;
91:
92:
93: // Ring buffer for event log output via thread
94: #define MAXLINES 10
95: #define LINELEN 200
96:
97: static HANDLE evt_hthread;
98: static char evt_lines[MAXLINES][LINELEN+1];
99: static int evt_priorities[MAXLINES];
100: static volatile int evt_timeout;
101: static int evt_index_in, evt_index_out;
102: static HANDLE evt_wait_in, evt_wait_out;
103:
104:
105: // Map syslog priority to event type
106:
107: static WORD pri2evtype(int priority)
108: {
109: switch (priority) {
110: default:
111: case LOG_EMERG: case LOG_ALERT:
112: case LOG_CRIT: case LOG_ERR:
113: return EVENTLOG_ERROR_TYPE;
114: case LOG_WARNING:
115: return EVENTLOG_WARNING_TYPE;
116: case LOG_NOTICE: case LOG_INFO:
117: case LOG_DEBUG:
118: return EVENTLOG_INFORMATION_TYPE;
119: }
120: }
121:
122:
123: // Map syslog priority to string
124:
125: static const char * pri2text(int priority)
126: {
127: switch (priority) {
128: case LOG_EMERG: return "EMERG";
129: case LOG_ALERT: return "ALERT";
130: case LOG_CRIT: return "CRIT";
131: default:
132: case LOG_ERR: return "ERROR";
133: case LOG_WARNING: return "Warn";
134: case LOG_NOTICE: return "Note";
135: case LOG_INFO: return "Info";
136: case LOG_DEBUG: return "Debug";
137: }
138: }
139:
140:
141: // Output cnt events from ring buffer
142:
143: static void report_events(int cnt)
144: {
145: const char * msgs[3+MAXLINES];
146:
147: int i, pri;
148: if (cnt <= 0)
149: return;
150: if (cnt > MAXLINES)
151: cnt = MAXLINES;
152:
153: pri = evt_priorities[evt_index_out];
154:
155: msgs[0] = sl_ident;
156: msgs[1] = sl_pidstr;
157: msgs[2] = pri2text(pri);
158: for (i = 0; i < cnt; i++) {
159: //assert(evt_priorities[evt_index_out] == pri);
160: msgs[3+i] = evt_lines[evt_index_out];
161: if (++evt_index_out >= MAXLINES)
162: evt_index_out = 0;
163: }
164: ReportEventA(sl_hevtsrc,
165: pri2evtype(pri), // type
166: 0, MSG_SYSLOG+cnt, // category, message id
167: NULL, // no security id
168: (WORD)(3+cnt), 0, // 3+cnt strings, ...
169: msgs, NULL); // ... , no data
170: }
171:
172:
173: // Thread to combine several syslog lines into one event log entry
174:
175: static ULONG WINAPI event_logger_thread(LPVOID arg)
176: {
177: int cnt;
178: ARGUSED(arg);
179:
180: cnt = 0;
181: for (;;) {
182: // Wait for first line ...
183: int prior, i, rest;
184: if (cnt == 0) {
185: if (WaitForSingleObject(evt_wait_out, (evt_timeout? INFINITE : 0)) != WAIT_OBJECT_0)
186: break;
187: cnt = 1;
188: }
189:
190: // ... wait some time for more lines with same prior
191: i = evt_index_out;
192: prior = evt_priorities[i];
193: rest = 0;
194: while (cnt < MAXLINES) {
195: long timeout =
196: evt_timeout * ((1000L * (MAXLINES-cnt+1))/MAXLINES);
197: if (WaitForSingleObject(evt_wait_out, timeout) != WAIT_OBJECT_0)
198: break;
199: if (++i >= MAXLINES)
200: i = 0;
201: if (evt_priorities[i] != prior) {
202: rest = 1;
203: break;
204: }
205: cnt++;
206: }
207:
208: // Output all in one event log entry
209: report_events(cnt);
210:
211: // Signal space
212: if (!ReleaseSemaphore(evt_wait_in, cnt, NULL))
213: break;
214: cnt = rest;
215: }
216: return 0;
217: }
218:
219:
220: static void on_exit_event_logger(void)
221: {
222: // Output lines immediate if exiting
223: evt_timeout = 0;
224: // Wait for thread to finish
225: WaitForSingleObject(evt_hthread, 1000L);
226: CloseHandle(evt_hthread);
227: #if 0
228: if (sl_hevtsrc) {
229: DeregisterEventSource(sl_hevtsrc); sl_hevtsrc = 0;
230: }
231: #else
232: // Leave event message source open to prevent losing messages during shutdown
233: #endif
234: }
235:
236:
237: static int start_event_logger()
238: {
239: DWORD tid;
240: evt_timeout = 1;
241: if ( !(evt_wait_in = CreateSemaphore(NULL, MAXLINES, MAXLINES, NULL))
242: || !(evt_wait_out = CreateSemaphore(NULL, 0, MAXLINES, NULL))) {
243: fprintf(stderr,"CreateSemaphore failed, Error=%ld\n", GetLastError());
244: return -1;
245: }
246: if (!(evt_hthread = CreateThread(NULL, 0, event_logger_thread, NULL, 0, &tid))) {
247: fprintf(stderr,"CreateThread failed, Error=%ld\n", GetLastError());
248: return -1;
249: }
250: atexit(on_exit_event_logger);
251: return 0;
252: }
253:
254:
255: // Write lines to event log ring buffer
256:
257: static void write_event_log(int priority, const char * lines)
258: {
259: int cnt = 0;
260: int i;
261: for (i = 0; lines[i]; i++) {
262: int len = 0;
263: while (lines[i+len] && lines[i+len] != '\n')
264: len++;
265: ;
266: if (len > 0) {
267: // Wait for space
268: if (WaitForSingleObject(evt_wait_in, INFINITE) != WAIT_OBJECT_0)
269: return;
270: // Copy line
271: evt_priorities[evt_index_in] = priority;
272: memcpy(evt_lines[evt_index_in], lines+i, (len < LINELEN ? len : LINELEN));
273: if (len < LINELEN)
274: evt_lines[evt_index_in][len] = 0;
275: if (++evt_index_in >= MAXLINES)
276: evt_index_in = 0;
277: // Signal avail if ring buffer full
278: if (++cnt >= MAXLINES) {
279: ReleaseSemaphore(evt_wait_out, cnt, NULL);
280: cnt = 0;
281: }
282: i += len;
283: }
284: if (!lines[i])
285: break;
286: }
287:
288: // Signal avail
289: if (cnt > 0)
290: ReleaseSemaphore(evt_wait_out, cnt, NULL);
291: Sleep(1);
292: }
293:
294:
295: // Write lines to logfile
296:
297: static void write_logfile(FILE * f, int priority, const char * lines)
298: {
299: time_t now; char stamp[sizeof("2004-04-04 10:00:00")+13];
300: int i;
301:
302: now = time((time_t*)0);
303: if (!strftime(stamp, sizeof(stamp)-1, "%Y-%m-%d %H:%M:%S", localtime(&now)))
304: strcpy(stamp,"?");
305:
306: for (i = 0; lines[i]; i++) {
307: int len = 0;
308: while (lines[i+len] && lines[i+len] != '\n')
309: len++;
310: if (len > 0) {
311: fprintf(f, "%s %s[%s]: %-5s: ",
312: stamp, sl_ident, sl_pidstr, pri2text(priority));
313: fwrite(lines+i, len, 1, f);
314: fputc('\n', f);
315: i += len;
316: }
317: if (!lines[i])
318: break;
319: }
320: }
321:
322:
323: void openlog(const char *ident, int logopt, int facility)
324: {
325: int pid;
326: if (sl_logpath[0] || sl_logfile || sl_hevtsrc)
327: return; // Already open
328:
329: strncpy(sl_ident, ident, sizeof(sl_ident)-1);
330: // logopt==LOG_PID assumed
331: ARGUSED(logopt);
332: pid = getpid();
333: if (snprintf(sl_pidstr, sizeof(sl_pidstr)-1, (pid >= 0 ? "%d" : "0x%X"), pid) < 0)
334: strcpy(sl_pidstr,"?");
335:
336: if (facility == LOG_LOCAL0) // "ident.log"
337: strcat(strcpy(sl_logpath, sl_ident), ".log");
338: else if (facility == LOG_LOCAL1) // stdout
339: sl_logfile = stdout;
340: else if (facility == LOG_LOCAL2) // stderr
341: sl_logfile = stderr;
342: else if (LOG_LOCAL2 < facility && facility <= LOG_LOCAL7) { // "ident[1-5].log"
343: snprintf(sl_logpath, sizeof(sl_logpath)-1, "%s%d.log",
344: sl_ident, LOG_FAC(facility)-LOG_FAC(LOG_LOCAL2));
345: }
346: else // Assume LOG_DAEMON, use event log if possible, else "ident.log"
347: if (!(sl_hevtsrc = RegisterEventSourceA(NULL/*localhost*/, sl_ident))) {
348: // Cannot open => Use logfile
349: long err = GetLastError();
350: strcat(strcpy(sl_logpath, sl_ident), ".log");
351: fprintf(stderr, "%s: Cannot register event source (Error=%ld), writing to %s\n",
352: sl_ident, err, sl_logpath);
353: }
354: else {
355: // Start event log thread
356: start_event_logger();
357: }
358: //assert(sl_logpath[0] || sl_logfile || sl_hevtsrc);
359:
360: }
361:
362:
363: void closelog()
364: {
365: }
366:
367:
368: void vsyslog(int priority, const char * message, va_list args)
369: {
370: char buffer[1000];
371:
372: // Translation of %m to error text not supported yet
373: if (strstr(message, "%m"))
374: message = "Internal error: \"%%m\" in log message";
375:
376: // Format message
377: if (vsnprintf(buffer, sizeof(buffer)-1, message, args) < 0)
378: strcpy(buffer, "Internal Error: buffer overflow");
379:
380: if (sl_hevtsrc) {
381: // Write to event log
382: write_event_log(priority, buffer);
383: }
384: else if (sl_logfile) {
385: // Write to stdout/err
386: write_logfile(sl_logfile, priority, buffer);
387: fflush(sl_logfile);
388: }
389: else if (sl_logpath[0]) {
390: // Append to logfile
391: FILE * f;
392: if (!(f = fopen(sl_logpath, "a")))
393: return;
394: write_logfile(f, priority, buffer);
395: fclose(f);
396: }
397: }
398:
399:
400: #ifdef TEST
401: // Test program
402:
403: void syslog(int priority, const char *message, ...)
404: {
405: va_list args;
406: va_start(args, message);
407: vsyslog(priority, message, args);
408: va_end(args);
409: }
410:
411: int main(int argc, char* argv[])
412: {
413: int i;
414: openlog(argc < 2 ? "test" : argv[1], LOG_PID, (argc < 3 ? LOG_DAEMON : LOG_LOCAL1));
415: syslog(LOG_INFO, "Info\n");
416: syslog(LOG_WARNING, "Warning %d\n\n", 42);
417: syslog(LOG_ERR, "Error %s", "Fatal");
418: for (i = 0; i < 100; i++) {
419: char buf[LINELEN];
420: if (i % 13 == 0)
421: Sleep(1000L);
422: sprintf(buf, "Log Line %d\n", i);
423: syslog(i % 17 ? LOG_INFO : LOG_ERR, buf);
424: }
425: closelog();
426: return 0;
427: }
428:
429: #endif
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