1 /*
2 * Copyright (c) 1983, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #if defined(LIBC_SCCS) && !defined(lint)
9 static char sccsid[] = "@(#)syslog.c 8.5 (Berkeley) 04/29/95";
10 #endif /* LIBC_SCCS and not lint */
11
12 #include <sys/types.h>
13 #include <sys/socket.h>
14 #include <sys/syslog.h>
15 #include <sys/uio.h>
16 #include <netdb.h>
17
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <paths.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <time.h>
24 #include <unistd.h>
25
26 #if __STDC__
27 #include <stdarg.h>
28 #else
29 #include <varargs.h>
30 #endif
31
32 static int LogFile = -1; /* fd for log */
33 static int connected; /* have done connect */
34 static int LogStat = 0; /* status bits, set by openlog() */
35 static const char *LogTag = NULL; /* string to tag the entry with */
36 static int LogFacility = LOG_USER; /* default facility code */
37 static int LogMask = 0xff; /* mask of priorities to be logged */
38 extern char *__progname; /* Program name, from crt0. */
39
40 /*
41 * syslog, vsyslog --
42 * print message on log file; output is intended for syslogd(8).
43 */
44 void
45 #if __STDC__
syslog(int pri,const char * fmt,...)46 syslog(int pri, const char *fmt, ...)
47 #else
48 syslog(pri, fmt, va_alist)
49 int pri;
50 char *fmt;
51 va_dcl
52 #endif
53 {
54 va_list ap;
55
56 #if __STDC__
57 va_start(ap, fmt);
58 #else
59 va_start(ap);
60 #endif
61 vsyslog(pri, fmt, ap);
62 va_end(ap);
63 }
64
65 void
vsyslog(pri,fmt,ap)66 vsyslog(pri, fmt, ap)
67 int pri;
68 register const char *fmt;
69 va_list ap;
70 {
71 register int cnt;
72 register char ch, *p, *t;
73 time_t now;
74 int fd, saved_errno;
75 char *stdp, tbuf[2048], fmt_cpy[1024];
76
77 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
78 /* Check for invalid bits. */
79 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
80 syslog(INTERNALLOG,
81 "syslog: unknown facility/priority: %x", pri);
82 pri &= LOG_PRIMASK|LOG_FACMASK;
83 }
84
85 /* Check priority against setlogmask values. */
86 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
87 return;
88
89 saved_errno = errno;
90
91 /* Set default facility if none specified. */
92 if ((pri & LOG_FACMASK) == 0)
93 pri |= LogFacility;
94
95 /* Build the message. */
96 (void)time(&now);
97 p = tbuf + sprintf(tbuf, "<%d>", pri);
98 p += strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ",
99 localtime(&now));
100 if (LogStat & LOG_PERROR)
101 stdp = p;
102 if (LogTag == NULL)
103 LogTag = __progname;
104 if (LogTag != NULL)
105 p += sprintf(p, "%s", LogTag);
106 if (LogStat & LOG_PID)
107 p += sprintf(p, "[%d]", getpid());
108 if (LogTag != NULL) {
109 *p++ = ':';
110 *p++ = ' ';
111 }
112
113 /* Substitute error message for %m. */
114 for (t = fmt_cpy; ch = *fmt; ++fmt)
115 if (ch == '%' && fmt[1] == 'm') {
116 ++fmt;
117 t += sprintf(t, "%s", strerror(saved_errno));
118 } else
119 *t++ = ch;
120 *t = '\0';
121
122 p += vsprintf(p, fmt_cpy, ap);
123 cnt = p - tbuf;
124
125 /* Output to stderr if requested. */
126 if (LogStat & LOG_PERROR) {
127 struct iovec iov[2];
128 register struct iovec *v = iov;
129
130 v->iov_base = stdp;
131 v->iov_len = cnt - (stdp - tbuf);
132 ++v;
133 v->iov_base = "\n";
134 v->iov_len = 1;
135 (void)writev(STDERR_FILENO, iov, 2);
136 }
137
138 /* Get connected, output the message to the local logger. */
139 if (!connected)
140 openlog(LogTag, LogStat | LOG_NDELAY, 0);
141 if (send(LogFile, tbuf, cnt, 0) >= 0)
142 return;
143
144 /*
145 * Output the message to the console; don't worry about blocking,
146 * if console blocks everything will. Make sure the error reported
147 * is the one from the syslogd failure.
148 */
149 if (LogStat & LOG_CONS &&
150 (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
151 (void)strcat(tbuf, "\r\n");
152 cnt += 2;
153 p = index(tbuf, '>') + 1;
154 (void)write(fd, p, cnt - (p - tbuf));
155 (void)close(fd);
156 }
157 }
158
159 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
160
161 void
openlog(ident,logstat,logfac)162 openlog(ident, logstat, logfac)
163 const char *ident;
164 int logstat, logfac;
165 {
166 if (ident != NULL)
167 LogTag = ident;
168 LogStat = logstat;
169 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
170 LogFacility = logfac;
171
172 if (LogFile == -1) {
173 SyslogAddr.sa_family = AF_UNIX;
174 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
175 sizeof(SyslogAddr.sa_data));
176 if (LogStat & LOG_NDELAY) {
177 if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
178 return;
179 (void)fcntl(LogFile, F_SETFD, 1);
180 }
181 }
182 if (LogFile != -1 && !connected)
183 if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
184 (void)close(LogFile);
185 LogFile = -1;
186 } else
187 connected = 1;
188 }
189
190 void
closelog()191 closelog()
192 {
193 (void)close(LogFile);
194 LogFile = -1;
195 connected = 0;
196 }
197
198 /* setlogmask -- set the log mask level */
199 int
setlogmask(pmask)200 setlogmask(pmask)
201 int pmask;
202 {
203 int omask;
204
205 omask = LogMask;
206 if (pmask != 0)
207 LogMask = pmask;
208 return (omask);
209 }
210