minix/lib/libc/gen/syslog.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

585 lines
14 KiB
C

/* $NetBSD: syslog.c,v 1.48 2010/05/13 22:40:14 christos Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)syslog.c 8.5 (Berkeley) 4/29/95";
#else
__RCSID("$NetBSD: syslog.c,v 1.48 2010/05/13 22:40:14 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <sys/param.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 <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "reentrant.h"
#include "extern.h"
#ifdef __weak_alias
__weak_alias(closelog,_closelog)
__weak_alias(openlog,_openlog)
__weak_alias(setlogmask,_setlogmask)
__weak_alias(syslog,_syslog)
__weak_alias(vsyslog,_vsyslog)
__weak_alias(syslogp,_syslogp)
__weak_alias(vsyslogp,_vsyslogp)
__weak_alias(closelog_r,_closelog_r)
__weak_alias(openlog_r,_openlog_r)
__weak_alias(setlogmask_r,_setlogmask_r)
__weak_alias(syslog_r,_syslog_r)
__weak_alias(vsyslog_r,_vsyslog_r)
__weak_alias(syslog_ss,_syslog_ss)
__weak_alias(vsyslog_ss,_vsyslog_ss)
__weak_alias(syslogp_r,_syslogp_r)
__weak_alias(vsyslogp_r,_vsyslogp_r)
__weak_alias(syslogp_ss,_syslogp_ss)
__weak_alias(vsyslogp_ss,_vsyslogp_ss)
#endif
static struct syslog_data sdata = SYSLOG_DATA_INIT;
static void openlog_unlocked_r(const char *, int, int,
struct syslog_data *);
static void disconnectlog_r(struct syslog_data *);
static void connectlog_r(struct syslog_data *);
#define LOG_SIGNAL_SAFE (int)0x80000000
#ifdef _REENTRANT
static mutex_t syslog_mutex = MUTEX_INITIALIZER;
#endif
static char hostname[MAXHOSTNAMELEN];
/*
* 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(pri, fmt, ap);
va_end(ap);
}
void
vsyslog(int pri, const char *fmt, va_list ap)
{
vsyslog_r(pri, &sdata, fmt, ap);
}
/*
* syslogp, vsyslogp --
* like syslog but take additional arguments for MSGID and SD
*/
void
syslogp(int pri, const char *msgid, const char *sdfmt, const char *msgfmt, ...)
{
va_list ap;
va_start(ap, msgfmt);
vsyslogp(pri, msgid, sdfmt, msgfmt, ap);
va_end(ap);
}
void
vsyslogp(int pri, const char *msgid, const char *sdfmt, const char *msgfmt, va_list ap)
{
vsyslogp_r(pri, &sdata, msgid, sdfmt, msgfmt, ap);
}
void
openlog(const char *ident, int logstat, int logfac)
{
openlog_r(ident, logstat, logfac, &sdata);
}
void
closelog(void)
{
closelog_r(&sdata);
}
/* setlogmask -- set the log mask level */
int
setlogmask(int pmask)
{
return setlogmask_r(pmask, &sdata);
}
/* Reentrant version of syslog, i.e. syslog_r() */
void
syslog_r(int pri, struct syslog_data *data, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsyslog_r(pri, data, fmt, ap);
va_end(ap);
}
void
syslogp_r(int pri, struct syslog_data *data, const char *msgid,
const char *sdfmt, const char *msgfmt, ...)
{
va_list ap;
va_start(ap, msgfmt);
vsyslogp_r(pri, data, msgid, sdfmt, msgfmt, ap);
va_end(ap);
}
void
syslog_ss(int pri, struct syslog_data *data, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vsyslog_r(pri | LOG_SIGNAL_SAFE, data, fmt, ap);
va_end(ap);
}
void
syslogp_ss(int pri, struct syslog_data *data, const char *msgid,
const char *sdfmt, const char *msgfmt, ...)
{
va_list ap;
va_start(ap, msgfmt);
vsyslogp_r(pri | LOG_SIGNAL_SAFE, data, msgid, sdfmt, msgfmt, ap);
va_end(ap);
}
void
vsyslog_ss(int pri, struct syslog_data *data, const char *fmt, va_list ap)
{
vsyslog_r(pri | LOG_SIGNAL_SAFE, data, fmt, ap);
}
void
vsyslogp_ss(int pri, struct syslog_data *data, const char *msgid,
const char *sdfmt, const char *msgfmt, va_list ap)
{
vsyslogp_r(pri | LOG_SIGNAL_SAFE, data, msgid, sdfmt, msgfmt, ap);
}
void
vsyslog_r(int pri, struct syslog_data *data, const char *fmt, va_list ap)
{
vsyslogp_r(pri, data, NULL, NULL, fmt, ap);
}
void
vsyslogp_r(int pri, struct syslog_data *data, const char *msgid,
const char *sdfmt, const char *msgfmt, va_list ap)
{
static const char BRCOSP[] = "]: ";
static const char CRLF[] = "\r\n";
size_t cnt, prlen, tries;
char ch, *p, *t;
struct timeval tv;
struct tm tmnow;
time_t now;
int fd, saved_errno;
#define TBUF_LEN 2048
#define FMT_LEN 1024
#define MAXTRIES 10
char tbuf[TBUF_LEN], fmt_cpy[FMT_LEN], fmt_cat[FMT_LEN] = "";
size_t tbuf_left, fmt_left, msgsdlen;
char *fmt = fmt_cat;
int signal_safe = pri & LOG_SIGNAL_SAFE;
struct iovec iov[7]; /* prog + [ + pid + ]: + fmt + crlf */
int opened, iovcnt;
pri &= ~LOG_SIGNAL_SAFE;
#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
/* Check for invalid bits. */
if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
syslog_r(INTERNALLOG | signal_safe, data,
"syslog_r: unknown facility/priority: %x", pri);
pri &= LOG_PRIMASK|LOG_FACMASK;
}
/* Check priority against setlogmask values. */
if (!(LOG_MASK(LOG_PRI(pri)) & data->log_mask))
return;
saved_errno = errno;
/* Set default facility if none specified. */
if ((pri & LOG_FACMASK) == 0)
pri |= data->log_fac;
/* Build the message. */
p = tbuf;
tbuf_left = TBUF_LEN;
#define DEC() \
do { \
if (prlen >= tbuf_left) \
prlen = tbuf_left - 1; \
p += prlen; \
tbuf_left -= prlen; \
} while (/*CONSTCOND*/0)
prlen = snprintf_ss(p, tbuf_left, "<%d>1 ", pri);
DEC();
if (!signal_safe && (gettimeofday(&tv, NULL) != -1)) {
/* strftime() implies tzset(), localtime_r() doesn't. */
tzset();
now = (time_t) tv.tv_sec;
localtime_r(&now, &tmnow);
prlen = strftime(p, tbuf_left, "%FT%T", &tmnow);
DEC();
prlen = snprintf(p, tbuf_left, ".%06ld", (long)tv.tv_usec);
DEC();
prlen = strftime(p, tbuf_left-1, "%z", &tmnow);
/* strftime gives eg. "+0200", but we need "+02:00" */
if (prlen == 5) {
p[prlen+1] = p[prlen];
p[prlen] = p[prlen-1];
p[prlen-1] = p[prlen-2];
p[prlen-2] = ':';
prlen += 1;
}
} else {
prlen = snprintf_ss(p, tbuf_left, "-");
/* if gmtime_r() was signal-safe we could output the UTC-time:
gmtime_r(&now, &tmnow);
prlen = strftime(p, tbuf_left, "%FT%TZ", &tmnow);
*/
}
DEC();
prlen = snprintf_ss(p, tbuf_left, " %s ", hostname);
DEC();
if (data->log_tag == NULL)
data->log_tag = getprogname();
prlen = snprintf_ss(p, tbuf_left, "%s ",
data->log_tag ? data->log_tag : "-");
if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
iovcnt = 0;
iov[iovcnt].iov_base = p;
iov[iovcnt].iov_len = prlen - 1;
iovcnt++;
}
DEC();
if (data->log_stat & LOG_PID) {
prlen = snprintf_ss(p, tbuf_left, "%d ", getpid());
if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
iov[iovcnt].iov_base = __UNCONST("[");
iov[iovcnt].iov_len = 1;
iovcnt++;
iov[iovcnt].iov_base = p;
iov[iovcnt].iov_len = prlen - 1;
iovcnt++;
iov[iovcnt].iov_base = __UNCONST(BRCOSP);
iov[iovcnt].iov_len = 3;
iovcnt++;
}
} else {
prlen = snprintf_ss(p, tbuf_left, "- ");
if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
iov[iovcnt].iov_base = __UNCONST(BRCOSP + 1);
iov[iovcnt].iov_len = 2;
iovcnt++;
}
}
DEC();
/*
* concat the format strings, then use one vsnprintf()
*/
if (msgid != NULL && *msgid != '\0') {
strlcat(fmt_cat, msgid, FMT_LEN);
strlcat(fmt_cat, " ", FMT_LEN);
} else
strlcat(fmt_cat, "- ", FMT_LEN);
if (sdfmt != NULL && *sdfmt != '\0') {
strlcat(fmt_cat, sdfmt, FMT_LEN);
} else
strlcat(fmt_cat, "-", FMT_LEN);
if (data->log_stat & (LOG_PERROR|LOG_CONS))
msgsdlen = strlen(fmt_cat) + 1;
else
msgsdlen = 0; /* XXX: GCC */
if (msgfmt != NULL && *msgfmt != '\0') {
strlcat(fmt_cat, " ", FMT_LEN);
strlcat(fmt_cat, msgfmt, FMT_LEN);
}
/*
* We wouldn't need this mess if printf handled %m, or if
* strerror() had been invented before syslog().
*/
for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt) != '\0'; ++fmt) {
if (ch == '%' && fmt[1] == 'm') {
char ebuf[128];
++fmt;
if (signal_safe ||
strerror_r(saved_errno, ebuf, sizeof(ebuf)))
prlen = snprintf_ss(t, fmt_left, "Error %d",
saved_errno);
else
prlen = snprintf_ss(t, fmt_left, "%s", ebuf);
if (prlen >= fmt_left)
prlen = fmt_left - 1;
t += prlen;
fmt_left -= prlen;
} else if (ch == '%' && fmt[1] == '%' && fmt_left > 2) {
*t++ = '%';
*t++ = '%';
fmt++;
fmt_left -= 2;
} else {
if (fmt_left > 1) {
*t++ = ch;
fmt_left--;
}
}
}
*t = '\0';
if (signal_safe)
prlen = vsnprintf_ss(p, tbuf_left, fmt_cpy, ap);
else
prlen = vsnprintf(p, tbuf_left, fmt_cpy, ap);
if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
iov[iovcnt].iov_base = p + msgsdlen;
iov[iovcnt].iov_len = prlen - msgsdlen;
iovcnt++;
}
DEC();
cnt = p - tbuf;
/* Output to stderr if requested. */
if (data->log_stat & LOG_PERROR) {
iov[iovcnt].iov_base = __UNCONST(CRLF + 1);
iov[iovcnt].iov_len = 1;
(void)writev(STDERR_FILENO, iov, iovcnt + 1);
}
/* Get connected, output the message to the local logger. */
#ifndef __minix
if (data == &sdata)
mutex_lock(&syslog_mutex);
#endif
opened = !data->opened;
if (opened)
openlog_unlocked_r(data->log_tag, data->log_stat, 0, data);
connectlog_r(data);
/*
* If the send() failed, there are two likely scenarios:
* 1) syslogd was restarted
* 2) /dev/log is out of socket buffer space
* We attempt to reconnect to /dev/log to take care of
* case #1 and keep send()ing data to cover case #2
* to give syslogd a chance to empty its socket buffer.
*/
for (tries = 0; tries < MAXTRIES; tries++) {
if (send(data->log_file, tbuf, cnt, 0) != -1)
break;
if (errno != ENOBUFS) {
disconnectlog_r(data);
connectlog_r(data);
} else
(void)usleep(1);
}
/*
* Output the message to the console; try not to block
* as a blocking console should not stop other processes.
* Make sure the error reported is the one from the syslogd failure.
*/
if (tries == MAXTRIES && (data->log_stat & LOG_CONS) &&
(fd = open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
iov[iovcnt].iov_base = __UNCONST(CRLF);
iov[iovcnt].iov_len = 2;
(void)writev(fd, iov, iovcnt + 1);
(void)close(fd);
}
#ifndef __minix
if (data == &sdata)
mutex_unlock(&syslog_mutex);
#endif
if (data != &sdata && opened) {
/* preserve log tag */
const char *ident = data->log_tag;
closelog_r(data);
data->log_tag = ident;
}
}
static void
disconnectlog_r(struct syslog_data *data)
{
/*
* If the user closed the FD and opened another in the same slot,
* that's their problem. They should close it before calling on
* system services.
*/
if (data->log_file != -1) {
(void)close(data->log_file);
data->log_file = -1;
}
data->connected = 0; /* retry connect */
}
static void
connectlog_r(struct syslog_data *data)
{
/* AF_UNIX address of local logger */
static const struct sockaddr_un sun = {
.sun_family = AF_LOCAL,
#ifndef __minix
.sun_len = sizeof(sun),
#endif
.sun_path = _PATH_LOG,
};
if (data->log_file == -1 || fcntl(data->log_file, F_GETFL, 0) == -1) {
if ((data->log_file = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
return;
(void)fcntl(data->log_file, F_SETFD, FD_CLOEXEC);
data->connected = 0;
}
if (!data->connected) {
if (connect(data->log_file,
(const struct sockaddr *)(const void *)&sun,
sizeof(sun)) == -1) {
(void)close(data->log_file);
data->log_file = -1;
} else
data->connected = 1;
}
}
static void
openlog_unlocked_r(const char *ident, int logstat, int logfac,
struct syslog_data *data)
{
if (ident != NULL)
data->log_tag = ident;
data->log_stat = logstat;
if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
data->log_fac = logfac;
if (data->log_stat & LOG_NDELAY) /* open immediately */
connectlog_r(data);
/* We could cache this, but then it might change */
if (gethostname(hostname, sizeof(hostname)) == -1
|| hostname[0] == '\0') {
/* can this really happen? */
hostname[0] = '-';
hostname[1] = '\0';
}
data->opened = 1;
}
void
openlog_r(const char *ident, int logstat, int logfac, struct syslog_data *data)
{
#ifndef __minix
if (data == &sdata)
mutex_lock(&syslog_mutex);
#endif
openlog_unlocked_r(ident, logstat, logfac, data);
#ifndef __minix
if (data == &sdata)
mutex_unlock(&syslog_mutex);
#endif
}
void
closelog_r(struct syslog_data *data)
{
#ifndef __minix
if (data == &sdata)
mutex_lock(&syslog_mutex);
#endif
(void)close(data->log_file);
data->log_file = -1;
data->connected = 0;
data->log_tag = NULL;
#ifndef __minix
if (data == &sdata)
mutex_unlock(&syslog_mutex);
#endif
}
int
setlogmask_r(int pmask, struct syslog_data *data)
{
int omask;
omask = data->log_mask;
if (pmask != 0)
data->log_mask = pmask;
return omask;
}