/* * 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. * 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 <sys/un.h> #include <netdb.h> #include <errno.h> #include <fcntl.h> #include <paths.h> #include <stdio.h> #include <stdio_ext.h> #include <string.h> #include <time.h> #include <unistd.h> #include <stdlib.h> #include <libc-lock.h> #include <signal.h> #include <locale.h> #include <stdarg.h> #include <libio/libioP.h> #include <math_ldbl_opt.h> #include <kernel-features.h> #define ftell(s) _IO_ftell (s) static int LogType = SOCK_DGRAM; /* type of socket connection */ static int LogFile = -1; /* fd for log */ static int connected; /* have done connect */ static int LogStat; /* status bits, set by openlog() */ static const char *LogTag; /* 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. */ /* Define the lock. */ __libc_lock_define_initialized (static, syslog_lock) static void openlog_internal(const char *, int, int); static void closelog_internal(void); #ifndef NO_SIGPIPE static void sigpipe_handler (int); #endif #ifndef send_flags # define send_flags 0 #endif struct cleanup_arg { void *buf; struct sigaction *oldaction; }; static void cancel_handler (void *ptr) { #ifndef NO_SIGPIPE /* Restore the old signal handler. */ struct cleanup_arg *clarg = (struct cleanup_arg *) ptr; if (clarg != NULL && clarg->oldaction != NULL) __sigaction (SIGPIPE, clarg->oldaction, NULL); #endif /* Free the lock. */ __libc_lock_unlock (syslog_lock); } /* * syslog, vsyslog -- * print message on log file; output is intended for syslogd(8). */ void __syslog(int pri, const char *fmt, ...) { va_list ap; va_start(ap, fmt); __vsyslog_internal(pri, fmt, ap, 0); va_end(ap); } ldbl_hidden_def (__syslog, syslog) ldbl_strong_alias (__syslog, syslog) void __vsyslog(int pri, const char *fmt, va_list ap) { __vsyslog_internal(pri, fmt, ap, 0); } ldbl_weak_alias (__vsyslog, vsyslog) void __syslog_chk(int pri, int flag, const char *fmt, ...) { va_list ap; va_start(ap, fmt); __vsyslog_internal(pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0); va_end(ap); } void __vsyslog_chk(int pri, int flag, const char *fmt, va_list ap) { __vsyslog_internal(pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0); } void __vsyslog_internal(int pri, const char *fmt, va_list ap, unsigned int mode_flags) { struct tm now_tm; time_t now; int fd; FILE *f; char *buf = 0; size_t bufsize = 0; size_t msgoff; #ifndef NO_SIGPIPE struct sigaction action, oldaction; int sigpipe; #endif int saved_errno = errno; char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"]; #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) == 0) return; /* Set default facility if none specified. */ if ((pri & LOG_FACMASK) == 0) pri |= LogFacility; /* Build the message in a memory-buffer stream. */ f = __open_memstream (&buf, &bufsize); if (f == NULL) { /* We cannot get a stream. There is not much we can do but emitting an error messages. */ char numbuf[3 * sizeof (pid_t)]; char *nump; char *endp = __stpcpy (failbuf, "out of memory ["); pid_t pid = __getpid (); nump = numbuf + sizeof (numbuf); /* The PID can never be zero. */ do *--nump = '0' + pid % 10; while ((pid /= 10) != 0); endp = __mempcpy (endp, nump, (numbuf + sizeof (numbuf)) - nump); *endp++ = ']'; *endp = '\0'; buf = failbuf; bufsize = endp - failbuf; msgoff = 0; } else { __fsetlocking (f, FSETLOCKING_BYCALLER); fprintf (f, "<%d>", pri); now = time_now (); f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr, f->_IO_write_end - f->_IO_write_ptr, "%h %e %T ", __localtime_r (&now, &now_tm), _nl_C_locobj_ptr); msgoff = ftell (f); if (LogTag == NULL) LogTag = __progname; if (LogTag != NULL) __fputs_unlocked (LogTag, f); if (LogStat & LOG_PID) fprintf (f, "[%d]", (int) __getpid ()); if (LogTag != NULL) { __putc_unlocked (':', f); __putc_unlocked (' ', f); } /* Restore errno for %m format. */ __set_errno (saved_errno); /* We have the header. Print the user's format into the buffer. */ __vfprintf_internal (f, fmt, ap, mode_flags); /* Close the memory stream; this will finalize the data into a malloc'd buffer in BUF. */ fclose (f); } /* Output to stderr if requested. */ if (LogStat & LOG_PERROR) { struct iovec iov[2]; struct iovec *v = iov; v->iov_base = buf + msgoff; v->iov_len = bufsize - msgoff; /* Append a newline if necessary. */ if (buf[bufsize - 1] != '\n') { ++v; v->iov_base = (char *) "\n"; v->iov_len = 1; } __libc_cleanup_push (free, buf == failbuf ? NULL : buf); /* writev is a cancellation point. */ (void)__writev(STDERR_FILENO, iov, v - iov + 1); __libc_cleanup_pop (0); } /* Prepare for multiple users. We have to take care: open and write are cancellation points. */ struct cleanup_arg clarg; clarg.buf = buf; clarg.oldaction = NULL; __libc_cleanup_push (cancel_handler, &clarg); __libc_lock_lock (syslog_lock); #ifndef NO_SIGPIPE /* Prepare for a broken connection. */ memset (&action, 0, sizeof (action)); action.sa_handler = sigpipe_handler; sigemptyset (&action.sa_mask); sigpipe = __sigaction (SIGPIPE, &action, &oldaction); if (sigpipe == 0) clarg.oldaction = &oldaction; #endif /* Get connected, output the message to the local logger. */ if (!connected) openlog_internal(LogTag, LogStat | LOG_NDELAY, 0); /* If we have a SOCK_STREAM connection, also send ASCII NUL as a record terminator. */ if (LogType == SOCK_STREAM) ++bufsize; if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0) { if (connected) { /* Try to reopen the syslog connection. Maybe it went down. */ closelog_internal (); openlog_internal(LogTag, LogStat | LOG_NDELAY, 0); } if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0) { closelog_internal (); /* attempt re-open next time */ /* * 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|O_NOCTTY, 0)) >= 0) { __dprintf (fd, "%s\r\n", buf + msgoff); (void)__close(fd); } } } #ifndef NO_SIGPIPE if (sigpipe == 0) __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL); #endif /* End of critical section. */ __libc_cleanup_pop (0); __libc_lock_unlock (syslog_lock); if (buf != failbuf) free (buf); } static struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */ static void openlog_internal(const char *ident, int logstat, int logfac) { if (ident != NULL) LogTag = ident; LogStat = logstat; if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) LogFacility = logfac; int retry = 0; while (retry < 2) { if (LogFile == -1) { SyslogAddr.sun_family = AF_UNIX; (void)strncpy(SyslogAddr.sun_path, _PATH_LOG, sizeof(SyslogAddr.sun_path)); if (LogStat & LOG_NDELAY) { LogFile = __socket(AF_UNIX, LogType | SOCK_CLOEXEC, 0); if (LogFile == -1) return; } } if (LogFile != -1 && !connected) { int old_errno = errno; if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { int saved_errno = errno; int fd = LogFile; LogFile = -1; (void)__close(fd); __set_errno (old_errno); if (saved_errno == EPROTOTYPE) { /* retry with the other type: */ LogType = (LogType == SOCK_DGRAM ? SOCK_STREAM : SOCK_DGRAM); ++retry; continue; } } else connected = 1; } break; } } void openlog (const char *ident, int logstat, int logfac) { /* Protect against multiple users and cancellation. */ __libc_cleanup_push (cancel_handler, NULL); __libc_lock_lock (syslog_lock); openlog_internal (ident, logstat, logfac); __libc_cleanup_pop (1); } #ifndef NO_SIGPIPE static void sigpipe_handler (int signo) { closelog_internal (); } #endif static void closelog_internal (void) { if (!connected) return; __close (LogFile); LogFile = -1; connected = 0; } void closelog (void) { /* Protect against multiple users and cancellation. */ __libc_cleanup_push (cancel_handler, NULL); __libc_lock_lock (syslog_lock); closelog_internal (); LogTag = NULL; LogType = SOCK_DGRAM; /* this is the default */ /* Free the lock. */ __libc_cleanup_pop (1); } /* setlogmask -- set the log mask level */ int setlogmask (int pmask) { int omask; omask = LogMask; if (pmask != 0) LogMask = pmask; return (omask); }