Annotation of src/lib/libc/gen/syslog.c, Revision 1.6
1.6 ! cgd 1: /* $NetBSD$ */
! 2:
1.1 cgd 3: /*
1.6 ! cgd 4: * Copyright (c) 1983, 1988, 1993
! 5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #if defined(LIBC_SCCS) && !defined(lint)
1.6 ! cgd 37: #if 0
! 38: static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94";
! 39: #else
! 40: static char rcsid[] = "$NetBSD";
! 41: #endif
1.1 cgd 42: #endif /* LIBC_SCCS and not lint */
43:
44: #include <sys/types.h>
45: #include <sys/socket.h>
46: #include <sys/syslog.h>
47: #include <sys/uio.h>
48: #include <netdb.h>
1.2 glass 49:
50: #include <errno.h>
51: #include <fcntl.h>
52: #include <paths.h>
53: #include <stdio.h>
1.1 cgd 54: #include <string.h>
1.2 glass 55: #include <time.h>
56: #include <unistd.h>
57:
1.1 cgd 58: #if __STDC__
59: #include <stdarg.h>
60: #else
61: #include <varargs.h>
62: #endif
63:
64: static int LogFile = -1; /* fd for log */
65: static int connected; /* have done connect */
66: static int LogStat = 0; /* status bits, set by openlog() */
1.6 ! cgd 67: static const char *LogTag = NULL; /* string to tag the entry with */
1.1 cgd 68: static int LogFacility = LOG_USER; /* default facility code */
69: static int LogMask = 0xff; /* mask of priorities to be logged */
1.6 ! cgd 70: extern char *__progname; /* Program name, from crt0. */
1.1 cgd 71:
72: /*
73: * syslog, vsyslog --
74: * print message on log file; output is intended for syslogd(8).
75: */
76: void
77: #if __STDC__
78: syslog(int pri, const char *fmt, ...)
79: #else
80: syslog(pri, fmt, va_alist)
81: int pri;
82: char *fmt;
83: va_dcl
84: #endif
85: {
86: va_list ap;
87:
88: #if __STDC__
89: va_start(ap, fmt);
90: #else
91: va_start(ap);
92: #endif
93: vsyslog(pri, fmt, ap);
94: va_end(ap);
95: }
96:
97: void
98: vsyslog(pri, fmt, ap)
99: int pri;
100: register const char *fmt;
101: va_list ap;
102: {
103: register int cnt;
1.6 ! cgd 104: register char ch, *p, *t;
1.2 glass 105: time_t now;
1.1 cgd 106: int fd, saved_errno;
1.2 glass 107: char *stdp, tbuf[2048], fmt_cpy[1024];
108:
109: #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
110: /* Check for invalid bits. */
111: if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
112: syslog(INTERNALLOG,
113: "syslog: unknown facility/priority: %x", pri);
114: pri &= LOG_PRIMASK|LOG_FACMASK;
115: }
1.1 cgd 116:
1.2 glass 117: /* Check priority against setlogmask values. */
118: if (!LOG_MASK(LOG_PRI(pri)) & LogMask)
1.1 cgd 119: return;
120:
121: saved_errno = errno;
122:
1.6 ! cgd 123: /* Set default facility if none specified. */
1.1 cgd 124: if ((pri & LOG_FACMASK) == 0)
125: pri |= LogFacility;
126:
1.6 ! cgd 127: /* Build the message. */
1.1 cgd 128: (void)time(&now);
1.6 ! cgd 129: p = tbuf + sprintf(tbuf, "<%d>", pri);
! 130: p += strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ",
! 131: localtime(&now));
1.1 cgd 132: if (LogStat & LOG_PERROR)
133: stdp = p;
1.6 ! cgd 134: if (LogTag == NULL)
! 135: LogTag = __progname;
! 136: if (LogTag != NULL)
! 137: p += sprintf(p, "%s", LogTag);
! 138: if (LogStat & LOG_PID)
! 139: p += sprintf(p, "[%d]", getpid());
! 140: if (LogTag != NULL) {
1.1 cgd 141: *p++ = ':';
142: *p++ = ' ';
143: }
144:
1.6 ! cgd 145: /* Substitute error message for %m. */
! 146: for (t = fmt_cpy; ch = *fmt; ++fmt)
! 147: if (ch == '%' && fmt[1] == 'm') {
! 148: ++fmt;
! 149: t += sprintf(t, "%s", strerror(saved_errno));
! 150: } else
! 151: *t++ = ch;
! 152: *t = '\0';
1.1 cgd 153:
1.6 ! cgd 154: p += vsprintf(p, fmt_cpy, ap);
! 155: cnt = p - tbuf;
1.1 cgd 156:
1.6 ! cgd 157: /* Output to stderr if requested. */
1.1 cgd 158: if (LogStat & LOG_PERROR) {
159: struct iovec iov[2];
160: register struct iovec *v = iov;
161:
162: v->iov_base = stdp;
163: v->iov_len = cnt - (stdp - tbuf);
164: ++v;
165: v->iov_base = "\n";
166: v->iov_len = 1;
167: (void)writev(STDERR_FILENO, iov, 2);
168: }
169:
1.6 ! cgd 170: /* Get connected, output the message to the local logger. */
1.1 cgd 171: if (!connected)
172: openlog(LogTag, LogStat | LOG_NDELAY, 0);
173: if (send(LogFile, tbuf, cnt, 0) >= 0)
174: return;
175:
176: /*
177: * Output the message to the console; don't worry about blocking,
178: * if console blocks everything will. Make sure the error reported
179: * is the one from the syslogd failure.
180: */
1.6 ! cgd 181: if (LogStat & LOG_CONS &&
! 182: (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
1.1 cgd 183: (void)strcat(tbuf, "\r\n");
184: cnt += 2;
1.5 jtc 185: p = strchr(tbuf, '>') + 1;
1.1 cgd 186: (void)write(fd, p, cnt - (p - tbuf));
187: (void)close(fd);
188: }
189: }
190:
191: static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
192:
193: void
194: openlog(ident, logstat, logfac)
195: const char *ident;
196: int logstat, logfac;
197: {
198: if (ident != NULL)
199: LogTag = ident;
200: LogStat = logstat;
201: if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
202: LogFacility = logfac;
203:
204: if (LogFile == -1) {
205: SyslogAddr.sa_family = AF_UNIX;
206: (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
207: sizeof(SyslogAddr.sa_data));
208: if (LogStat & LOG_NDELAY) {
209: if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
210: return;
211: (void)fcntl(LogFile, F_SETFD, 1);
212: }
213: }
214: if (LogFile != -1 && !connected)
215: if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
216: (void)close(LogFile);
217: LogFile = -1;
218: } else
219: connected = 1;
220: }
221:
222: void
223: closelog()
224: {
225: (void)close(LogFile);
226: LogFile = -1;
227: connected = 0;
228: }
229:
230: /* setlogmask -- set the log mask level */
1.2 glass 231: int
1.1 cgd 232: setlogmask(pmask)
233: int pmask;
234: {
235: int omask;
236:
237: omask = LogMask;
238: if (pmask != 0)
239: LogMask = pmask;
240: return (omask);
241: }
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