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
|
/*
* Copyright (c) 1983, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* based on @(#)syslog.c 5.20 (Berkeley) 1/19/89 */
/*
* SYSLOG -- print message on log file
*
* This routine looks a lot like printf, except that it outputs to the
* log file instead of the standard output. Also:
* adds a timestamp,
* prints the module name in front of the message,
* has some other formatting types (or will sometime),
* adds a newline on the end of the message.
*
* The output of this routine is intended to be read by syslogd(8).
*
* Author: Eric Allman
* Modified to use UNIX domain IPC by Ralph Campbell
*/
#ifdef __STDC__
#include <stdarg.h>
#else
#define const
#include <varargs.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <sys/syslog.h>
#include <sys/wait.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#define LOGNAME "/dev/log"
#define CONSOLE "/dev/console"
static int LogFile = -1; /* fd for log */
static int connected; /* have done connect */
static int LogStat = 0; /* status bits, set by openlog() */
static const char *LogTag = "syslog"; /* string to tag the entry with */
static int LogFacility = LOG_USER; /* default facility code */
void
#ifdef __STDC__
syslog(int pri, const char *fmt, ...)
#else
syslog(pri, fmt, va_alist)
int pri;
char *fmt;
va_dcl
#endif
{
va_list pvar;
void vsyslog();
#ifdef __STDC__
va_start(pvar, fmt);
#else
va_start(pvar);
#endif
vsyslog(pri, fmt, pvar);
va_end(pvar);
}
void
vsyslog(pri, fmt, ap)
int pri;
const register char *fmt;
va_list ap;
{
extern int errno;
register int cnt;
register char *p;
time_t now, time();
int pid, saved_errno;
char tbuf[2048], fmt_cpy[1024], *ctime();
void openlog();
saved_errno = errno;
/* see if we should just throw out this message */
if ((u_int)LOG_FAC(pri) >= LOG_NFACILITIES ||
!LOG_MASK(LOG_PRI(pri)) || (pri &~ (LOG_PRIMASK|LOG_FACMASK)))
return;
if (LogFile < 0 || !connected)
openlog(LogTag, LogStat | LOG_NDELAY, 0);
/* set default facility if none specified */
if ((pri & LOG_FACMASK) == 0)
pri |= LogFacility;
/* build the message */
(void)time(&now);
(void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4);
for (p = tbuf; *p; ++p);
if (LogTag) {
(void)strcpy(p, LogTag);
for (; *p; ++p);
}
if (LogStat & LOG_PID) {
(void)sprintf(p, "[%d]", getpid());
for (; *p; ++p);
}
if (LogTag) {
*p++ = ':';
*p++ = ' ';
}
/* substitute error message for %m */
{
register char ch, *t1, *t2;
#ifndef strerror
extern char *strerror();
#endif
for (t1 = fmt_cpy; ch = *fmt; ++fmt)
if (ch == '%' && fmt[1] == 'm') {
++fmt;
for (t2 = strerror(saved_errno);
*t1 = *t2++; ++t1);
}
else
*t1++ = ch;
*t1 = '\0';
}
(void)vsprintf(p, fmt_cpy, ap);
/* output the message to the local logger */
if (send(LogFile, tbuf, cnt = strlen(tbuf), 0) >= 0 ||
!(LogStat&LOG_CONS))
return;
/* output the message to the console */
#if defined(SYSV) || defined(_AIX)
pid = fork();
#else
pid = vfork();
#endif
if (pid == -1)
return;
if (pid == 0) {
int fd;
(void)signal(SIGALRM, SIG_DFL);
sigsetmask((long)~sigmask(SIGALRM));
(void)alarm((u_int)5);
if ((fd = open(CONSOLE, O_WRONLY, 0)) < 0)
return;
(void)alarm((u_int)0);
(void)strcat(tbuf, "\r");
p = strchr(tbuf, '>') + 1;
(void)write(fd, p, cnt + 1 - (p - tbuf));
(void)close(fd);
_exit(0);
}
#if defined(SYSV) || defined(_AIX) || defined(_POSIX_SOURCE)
#define cast int *
#else
#define cast union wait *
#endif
if (!(LogStat & LOG_NOWAIT))
while ((cnt = wait((cast)0)) > 0 && cnt != pid);
#undef cast
}
static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
/*
* OPENLOG -- open system log
*/
void
openlog(ident, logstat, logfac)
const char *ident;
int logstat, logfac;
{
if (ident != NULL)
LogTag = ident;
LogStat = logstat;
if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
LogFacility = logfac;
if (LogFile == -1) {
SyslogAddr.sa_family = AF_UNIX;
strncpy(SyslogAddr.sa_data, LOGNAME, sizeof SyslogAddr.sa_data);
if (LogStat & LOG_NDELAY) {
LogFile = socket(AF_UNIX, SOCK_DGRAM, 0);
fcntl(LogFile, F_SETFD, 1);
}
}
if (LogFile != -1 && !connected &&
connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) != -1)
connected = 1;
}
/*
* CLOSELOG -- close the system log
*/
void
closelog()
{
(void) close(LogFile);
LogFile = -1;
connected = 0;
}
static int LogMask = 0xff; /* mask of priorities to be logged */
/*
* SETLOGMASK -- set the log mask level
*/
int
setlogmask(pmask)
int pmask;
{
int omask;
omask = LogMask;
if (pmask != 0)
LogMask = pmask;
return (omask);
}
|
