diff options
Diffstat (limited to 'misc/syslog.c')
| -rw-r--r-- | misc/syslog.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/misc/syslog.c b/misc/syslog.c new file mode 100644 index 0000000..ba82e23 --- /dev/null +++ b/misc/syslog.c @@ -0,0 +1,235 @@ +/* + * Copyright (c) 1983, 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/syslog.h> +#include <sys/uio.h> +#include <netdb.h> + +#include <errno.h> +#include <fcntl.h> +#include <paths.h> +#include <stdio.h> +#include <string.h> +#include <time.h> +#include <unistd.h> + +#if __STDC__ +#include <stdarg.h> +#else +#include <varargs.h> +#endif + +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 = NULL; /* string to tag the entry with */ +static int LogFacility = LOG_USER; /* default facility code */ +static int LogMask = 0xff; /* mask of priorities to be logged */ +extern char *__progname; /* Program name, from crt0. */ + +/* + * syslog, vsyslog -- + * print message on log file; output is intended for syslogd(8). + */ +void +#if __STDC__ +syslog(int pri, const char *fmt, ...) +#else +syslog(pri, fmt, va_alist) + int pri; + char *fmt; + va_dcl +#endif +{ + va_list ap; + +#if __STDC__ + va_start(ap, fmt); +#else + va_start(ap); +#endif + vsyslog(pri, fmt, ap); + va_end(ap); +} + +void +vsyslog(pri, fmt, ap) + int pri; + register const char *fmt; + va_list ap; +{ + register int cnt; + register char ch, *p, *t; + time_t now; + int fd, saved_errno; + char *stdp, tbuf[2048], fmt_cpy[1024]; + +#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID + /* Check for invalid bits. */ + if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { + syslog(INTERNALLOG, + "syslog: unknown facility/priority: %x", pri); + pri &= LOG_PRIMASK|LOG_FACMASK; + } + + /* Check priority against setlogmask values. */ + if (!LOG_MASK(LOG_PRI(pri)) & LogMask) + return; + + saved_errno = errno; + + /* Set default facility if none specified. */ + if ((pri & LOG_FACMASK) == 0) + pri |= LogFacility; + + /* Build the message. */ + (void)time(&now); + p = tbuf + sprintf(tbuf, "<%d>", pri); + p += strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ", + localtime(&now)); + if (LogStat & LOG_PERROR) + stdp = p; + if (LogTag == NULL) + LogTag = __progname; + if (LogTag != NULL) + p += sprintf(p, "%s", LogTag); + if (LogStat & LOG_PID) + p += sprintf(p, "[%d]", getpid()); + if (LogTag != NULL) { + *p++ = ':'; + *p++ = ' '; + } + + /* Substitute error message for %m. */ + for (t = fmt_cpy; ch = *fmt; ++fmt) + if (ch == '%' && fmt[1] == 'm') { + ++fmt; + t += sprintf(t, "%s", strerror(saved_errno)); + } else + *t++ = ch; + *t = '\0'; + + p += vsprintf(p, fmt_cpy, ap); + cnt = p - tbuf; + + /* Output to stderr if requested. */ + if (LogStat & LOG_PERROR) { + struct iovec iov[2]; + register struct iovec *v = iov; + + v->iov_base = stdp; + v->iov_len = cnt - (stdp - tbuf); + ++v; + v->iov_base = "\n"; + v->iov_len = 1; + (void)writev(STDERR_FILENO, iov, 2); + } + + /* Get connected, output the message to the local logger. */ + if (!connected) + openlog(LogTag, LogStat | LOG_NDELAY, 0); + if (send(LogFile, tbuf, cnt, 0) >= 0) + return; + + /* + * Output the message to the console; don't worry about blocking, + * if console blocks everything will. Make sure the error reported + * is the one from the syslogd failure. + */ + if (LogStat & LOG_CONS && + (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) { + (void)strcat(tbuf, "\r\n"); + cnt += 2; + p = index(tbuf, '>') + 1; + (void)write(fd, p, cnt - (p - tbuf)); + (void)close(fd); + } +} + +static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ + +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; + (void)strncpy(SyslogAddr.sa_data, _PATH_LOG, + sizeof(SyslogAddr.sa_data)); + if (LogStat & LOG_NDELAY) { + if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) + return; + (void)fcntl(LogFile, F_SETFD, 1); + } + } + if (LogFile != -1 && !connected) + if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { + (void)close(LogFile); + LogFile = -1; + } else + connected = 1; +} + +void +closelog() +{ + (void)close(LogFile); + LogFile = -1; + connected = 0; +} + +/* setlogmask -- set the log mask level */ +int +setlogmask(pmask) + int pmask; +{ + int omask; + + omask = LogMask; + if (pmask != 0) + LogMask = pmask; + return (omask); +} |