1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
|
/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2003
* Copyright (C) Miroslav Lichvar 2011-2014, 2018
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
*
**********************************************************************
=======================================================================
Module to handle logging of diagnostic information
*/
#include "config.h"
#include "sysincl.h"
#include "conf.h"
#include "logging.h"
#include "util.h"
/* This is used by DEBUG_LOG macro */
int log_debug_enabled = 0;
/* ================================================== */
/* Flag indicating we have initialised */
static int initialised = 0;
static FILE *file_log;
static int system_log = 0;
static int parent_fd = 0;
#define DEBUG_LEVEL_PRINT_FUNCTION 2
#define DEBUG_LEVEL_PRINT_DEBUG 2
static int debug_level = 0;
struct LogFile {
const char *name;
const char *banner;
FILE *file;
unsigned long writes;
};
static int n_filelogs = 0;
/* Increase this when adding a new logfile */
#define MAX_FILELOGS 6
static struct LogFile logfiles[MAX_FILELOGS];
/* ================================================== */
/* Init function */
void
LOG_Initialise(void)
{
initialised = 1;
file_log = stderr;
}
/* ================================================== */
/* Fini function */
void
LOG_Finalise(void)
{
if (system_log)
closelog();
if (file_log)
fclose(file_log);
LOG_CycleLogFiles();
initialised = 0;
}
/* ================================================== */
static void log_message(int fatal, LOG_Severity severity, const char *message)
{
if (system_log) {
int priority;
switch (severity) {
case LOGS_DEBUG:
priority = LOG_DEBUG;
break;
case LOGS_INFO:
priority = LOG_INFO;
break;
case LOGS_WARN:
priority = LOG_WARNING;
break;
case LOGS_ERR:
priority = LOG_ERR;
break;
case LOGS_FATAL:
priority = LOG_CRIT;
break;
default:
assert(0);
}
syslog(priority, fatal ? "Fatal error : %s" : "%s", message);
} else if (file_log) {
fprintf(file_log, fatal ? "Fatal error : %s\n" : "%s\n", message);
}
}
/* ================================================== */
void LOG_Message(LOG_Severity severity,
#if DEBUG > 0
int line_number, const char *filename, const char *function_name,
#endif
const char *format, ...)
{
char buf[2048];
va_list other_args;
time_t t;
struct tm *tm;
if (!system_log && file_log) {
/* Don't clutter up syslog with timestamps and internal debugging info */
time(&t);
tm = gmtime(&t);
if (tm) {
strftime(buf, sizeof (buf), "%Y-%m-%dT%H:%M:%SZ", tm);
fprintf(file_log, "%s ", buf);
}
#if DEBUG > 0
if (debug_level >= DEBUG_LEVEL_PRINT_FUNCTION)
fprintf(file_log, "%s:%d:(%s) ", filename, line_number, function_name);
#endif
}
va_start(other_args, format);
vsnprintf(buf, sizeof(buf), format, other_args);
va_end(other_args);
switch (severity) {
case LOGS_DEBUG:
case LOGS_INFO:
case LOGS_WARN:
case LOGS_ERR:
log_message(0, severity, buf);
break;
case LOGS_FATAL:
log_message(1, severity, buf);
/* Send the message also to the foreground process if it is
still running, or stderr if it is still open */
if (parent_fd > 0) {
if (write(parent_fd, buf, strlen(buf) + 1) < 0)
; /* Not much we can do here */
} else if (system_log && parent_fd == 0) {
system_log = 0;
log_message(1, severity, buf);
}
break;
default:
assert(0);
}
}
/* ================================================== */
void
LOG_OpenFileLog(const char *log_file)
{
FILE *f;
if (log_file) {
f = fopen(log_file, "a");
if (!f)
LOG_FATAL("Could not open log file %s", log_file);
} else {
f = stderr;
}
/* Enable line buffering */
setvbuf(f, NULL, _IOLBF, BUFSIZ);
if (file_log && file_log != stderr)
fclose(file_log);
file_log = f;
}
/* ================================================== */
void
LOG_OpenSystemLog(void)
{
system_log = 1;
openlog("chronyd", LOG_PID, LOG_DAEMON);
}
/* ================================================== */
void LOG_SetDebugLevel(int level)
{
debug_level = level;
if (level >= DEBUG_LEVEL_PRINT_DEBUG) {
log_debug_enabled = 1;
}
}
/* ================================================== */
void
LOG_SetParentFd(int fd)
{
parent_fd = fd;
if (file_log == stderr)
file_log = NULL;
}
/* ================================================== */
void
LOG_CloseParentFd()
{
if (parent_fd > 0)
close(parent_fd);
parent_fd = -1;
}
/* ================================================== */
LOG_FileID
LOG_FileOpen(const char *name, const char *banner)
{
assert(n_filelogs < MAX_FILELOGS);
logfiles[n_filelogs].name = name;
logfiles[n_filelogs].banner = banner;
logfiles[n_filelogs].file = NULL;
logfiles[n_filelogs].writes = 0;
return n_filelogs++;
}
/* ================================================== */
void
LOG_FileWrite(LOG_FileID id, const char *format, ...)
{
va_list other_args;
int banner;
if (id < 0 || id >= n_filelogs || !logfiles[id].name)
return;
if (!logfiles[id].file) {
char filename[512], *logdir = CNF_GetLogDir();
if (logdir[0] == '\0') {
LOG(LOGS_WARN, "logdir not specified");
logfiles[id].name = NULL;
return;
}
if (snprintf(filename, sizeof(filename), "%s/%s.log",
logdir, logfiles[id].name) >= sizeof (filename) ||
!(logfiles[id].file = fopen(filename, "a"))) {
LOG(LOGS_WARN, "Could not open log file %s", filename);
logfiles[id].name = NULL;
return;
}
/* Close on exec */
UTI_FdSetCloexec(fileno(logfiles[id].file));
}
banner = CNF_GetLogBanner();
if (banner && logfiles[id].writes++ % banner == 0) {
char bannerline[256];
int i, bannerlen;
bannerlen = strlen(logfiles[id].banner);
for (i = 0; i < bannerlen; i++)
bannerline[i] = '=';
bannerline[i] = '\0';
fprintf(logfiles[id].file, "%s\n", bannerline);
fprintf(logfiles[id].file, "%s\n", logfiles[id].banner);
fprintf(logfiles[id].file, "%s\n", bannerline);
}
va_start(other_args, format);
vfprintf(logfiles[id].file, format, other_args);
va_end(other_args);
fprintf(logfiles[id].file, "\n");
fflush(logfiles[id].file);
}
/* ================================================== */
void
LOG_CycleLogFiles(void)
{
LOG_FileID i;
for (i = 0; i < n_filelogs; i++) {
if (logfiles[i].file)
fclose(logfiles[i].file);
logfiles[i].file = NULL;
logfiles[i].writes = 0;
}
}
/* ================================================== */
|