void
openlog_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);
data->opened = 1; /* ident and facility has been set */
}
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 | SOCK_CLOEXEC,
0)) == -1)
return;
data->log_connected = 0;
}
if (!data->log_connected) {
#ifdef __minix
if(ioctl(data->log_file, NWIOSUDSTADDR, (void *) &sun) < 0)
#else
if (connect(data->log_file,
(const struct sockaddr *)(const void *)&sun,
(socklen_t)sizeof(sun)) == -1)
#endif
{
(void)close(data->log_file);
data->log_file = -1;
} else
data->log_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);
data->log_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->log_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;
}
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 0
/*
* if gmtime_r() was signal-safe we could output
* the UTC-time:
*/
gmtime_r(&now, &tmnow);
prlen = strftime(p, tbuf_left, "%FT%TZ", &tmnow);
#endif
}
#ifndef __minix
if (data == &sdata)
mutex_lock(&syslog_mutex);
#endif
if (data->log_hostname[0] == '\0' && gethostname(data->log_hostname,
sizeof(data->log_hostname)) == -1) {
/* can this really happen? */
data->log_hostname[0] = '-';
data->log_hostname[1] = '\0';
}
DEC();
prlen = snprintf_ss(p, tbuf_left, " %s ", data->log_hostname);
if (data->log_tag == NULL)
data->log_tag = getprogname();
DEC();
prlen = snprintf_ss(p, tbuf_left, "%s ",
data->log_tag ? data->log_tag : "-");
#ifndef __minix
if (data == &sdata)
mutex_unlock(&syslog_mutex);
#endif
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->log_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++) {
#ifdef __minix
if (write(data->log_file, tbuf, cnt) != -1)
#else
if (send(data->log_file, tbuf, cnt, 0) != -1)
#endif
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;
}
}
/*
* This is used by both syslog_r and syslog. The latter supplies
* a non-NULL gettime callback for filling in the date, but we also
* use the presence of that callback to decide whether it's safe
* to call strerror and what the name of the caller is
*/
void
__vsyslog_r(int pri, struct syslog_data *data,
size_t (*gettime)(char *, size_t), const char *fmt, va_list ap)
{
int cnt;
char ch, *p, *t;
int fd, saved_errno, error;
#define TBUF_LEN 2048
#define FMT_LEN 1024
char *stdp, tbuf[TBUF_LEN], fmt_cpy[FMT_LEN];
int tbuf_left, fmt_left, prlen;
#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
/* Check for invalid bits. */
if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
syslog_r(INTERNALLOG, data,
"syslog%s: unknown facility/priority: %x",
gettime != NULL ? "" : "_r", 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;
p = tbuf;
tbuf_left = TBUF_LEN;
#define DEC() \
do { \
if (prlen < 0) \
prlen = 0; \
if (prlen >= tbuf_left) \
prlen = tbuf_left - 1; \
p += prlen; \
tbuf_left -= prlen; \
} while (0)
prlen = snprintf(p, tbuf_left, "<%d>", pri);
DEC();
/*
* syslogd will expand time automagically for reentrant case, and
* for normal case, invoke the callback to do it just do like before
*/
if (gettime != NULL) {
prlen = gettime(p, tbuf_left);
DEC();
}
if (data->log_stat & LOG_PERROR)
stdp = p;
if (data->log_tag == NULL)
data->log_tag = __progname;
if (data->log_tag != NULL) {
prlen = snprintf(p, tbuf_left, "%s", data->log_tag);
DEC();
}
if (data->log_stat & LOG_PID) {
prlen = snprintf(p, tbuf_left, "[%ld]", (long)getpid());
DEC();
}
if (data->log_tag != NULL) {
if (tbuf_left > 1) {
*p++ = ':';
tbuf_left--;
}
if (tbuf_left > 1) {
*p++ = ' ';
tbuf_left--;
}
}
/* strerror() is not reentrant */
for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt); ++fmt) {
if (ch == '%' && fmt[1] == 'm') {
++fmt;
if (gettime != NULL) {
prlen = snprintf(t, fmt_left, "%s",
strerror(saved_errno));
} else {
prlen = snprintf(t, fmt_left, "Error %d",
saved_errno);
}
if (prlen < 0)
prlen = 0;
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';
prlen = vsnprintf(p, tbuf_left, fmt_cpy, ap);
DEC();
cnt = p - tbuf;
/* Output to stderr if requested. */
if (data->log_stat & LOG_PERROR) {
struct iovec iov[2];
iov[0].iov_base = stdp;
iov[0].iov_len = cnt - (stdp - tbuf);
iov[1].iov_base = "\n";
iov[1].iov_len = 1;
(void)writev(STDERR_FILENO, iov, 2);
}
/* Get connected, output the message to the local logger. */
if (!data->opened)
openlog_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.
*/
if ((error = send(data->log_file, tbuf, cnt, 0)) < 0) {
if (errno != ENOBUFS) {
disconnectlog_r(data);
connectlog_r(data);
}
do {
struct timespec rqt = { 0, 1000 };
nanosleep(&rqt, NULL);
if ((error = send(data->log_file, tbuf, cnt, 0)) >= 0)
break;
} while (errno == ENOBUFS);
}
/*
* 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 (error == -1 && (data->log_stat & LOG_CONS) &&
(fd = open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
struct iovec iov[2];
p = strchr(tbuf, '>') + 1;
iov[0].iov_base = p;
iov[0].iov_len = cnt - (p - tbuf);
iov[1].iov_base = "\r\n";
iov[1].iov_len = 2;
(void)writev(fd, iov, 2);
(void)close(fd);
}
}
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;
}
