freebsd-nq/lib/libpjdlog/pjdlog.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009-2010 The FreeBSD Foundation
* Copyright (c) 2011 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* This software was developed by Pawel Jakub Dawidek under sponsorship from
* the FreeBSD Foundation.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <libutil.h>
#include <limits.h>
#include <printf.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#ifdef notyet
#include <robustio.h>
#endif
#include "pjdlog.h"
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#define PJDLOG_MAX_MSGSIZE 4096
#define PJDLOG_PREFIX_STACK 4
#define PJDLOG_PREFIX_MAXSIZE 128
#define PJDLOG_NEVER_INITIALIZED 0
#define PJDLOG_NOT_INITIALIZED 1
#define PJDLOG_INITIALIZED 2
static int pjdlog_initialized = PJDLOG_NEVER_INITIALIZED;
static int pjdlog_mode, pjdlog_debug_level, pjdlog_sock;
static int pjdlog_prefix_current;
static char pjdlog_prefix[PJDLOG_PREFIX_STACK][PJDLOG_PREFIX_MAXSIZE];
static int
pjdlog_printf_arginfo_humanized_number(const struct printf_info *pi __unused,
size_t n, int *argt)
{
assert(n >= 1);
argt[0] = PA_INT | PA_FLAG_INTMAX;
return (1);
}
static int
pjdlog_printf_render_humanized_number(struct __printf_io *io,
const struct printf_info *pi, const void * const *arg)
{
char buf[5];
intmax_t num;
int ret;
num = *(const intmax_t *)arg[0];
humanize_number(buf, sizeof(buf), (int64_t)num, "", HN_AUTOSCALE,
HN_NOSPACE | HN_DECIMAL);
ret = __printf_out(io, pi, buf, strlen(buf));
__printf_flush(io);
return (ret);
}
static int
pjdlog_printf_arginfo_sockaddr(const struct printf_info *pi __unused,
size_t n, int *argt)
{
assert(n >= 1);
argt[0] = PA_POINTER;
return (1);
}
static int
pjdlog_printf_render_sockaddr_ip(struct __printf_io *io,
const struct printf_info *pi, const void * const *arg)
{
const struct sockaddr_storage *ss;
char addr[MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)];
int ret;
ss = *(const struct sockaddr_storage * const *)arg[0];
switch (ss->ss_family) {
case AF_INET:
{
const struct sockaddr_in *sin;
sin = (const struct sockaddr_in *)ss;
if (inet_ntop(ss->ss_family, &sin->sin_addr, addr,
sizeof(addr)) == NULL) {
PJDLOG_ABORT("inet_ntop(AF_INET) failed: %s.",
strerror(errno));
}
break;
}
case AF_INET6:
{
const struct sockaddr_in6 *sin;
sin = (const struct sockaddr_in6 *)ss;
if (inet_ntop(ss->ss_family, &sin->sin6_addr, addr,
sizeof(addr)) == NULL) {
PJDLOG_ABORT("inet_ntop(AF_INET6) failed: %s.",
strerror(errno));
}
break;
}
default:
snprintf(addr, sizeof(addr), "[unsupported family %hhu]",
ss->ss_family);
break;
}
ret = __printf_out(io, pi, addr, strlen(addr));
__printf_flush(io);
return (ret);
}
static int
pjdlog_printf_render_sockaddr(struct __printf_io *io,
const struct printf_info *pi, const void * const *arg)
{
const struct sockaddr_storage *ss;
char buf[PATH_MAX];
int ret;
ss = *(const struct sockaddr_storage * const *)arg[0];
switch (ss->ss_family) {
case AF_UNIX:
{
const struct sockaddr_un *sun;
sun = (const struct sockaddr_un *)ss;
if (sun->sun_path[0] == '\0')
snprintf(buf, sizeof(buf), "N/A");
else
snprintf(buf, sizeof(buf), "%s", sun->sun_path);
break;
}
case AF_INET:
{
char addr[INET_ADDRSTRLEN];
const struct sockaddr_in *sin;
unsigned int port;
sin = (const struct sockaddr_in *)ss;
port = ntohs(sin->sin_port);
if (inet_ntop(ss->ss_family, &sin->sin_addr, addr,
sizeof(addr)) == NULL) {
PJDLOG_ABORT("inet_ntop(AF_INET) failed: %s.",
strerror(errno));
}
snprintf(buf, sizeof(buf), "%s:%u", addr, port);
break;
}
case AF_INET6:
{
char addr[INET6_ADDRSTRLEN];
const struct sockaddr_in6 *sin;
unsigned int port;
sin = (const struct sockaddr_in6 *)ss;
port = ntohs(sin->sin6_port);
if (inet_ntop(ss->ss_family, &sin->sin6_addr, addr,
sizeof(addr)) == NULL) {
PJDLOG_ABORT("inet_ntop(AF_INET6) failed: %s.",
strerror(errno));
}
snprintf(buf, sizeof(buf), "[%s]:%u", addr, port);
break;
}
default:
snprintf(buf, sizeof(buf), "[unsupported family %hhu]",
ss->ss_family);
break;
}
ret = __printf_out(io, pi, buf, strlen(buf));
__printf_flush(io);
return (ret);
}
void
pjdlog_init(int mode)
{
int saved_errno;
assert(pjdlog_initialized == PJDLOG_NEVER_INITIALIZED ||
pjdlog_initialized == PJDLOG_NOT_INITIALIZED);
#ifdef notyet
assert(mode == PJDLOG_MODE_STD || mode == PJDLOG_MODE_SYSLOG ||
mode == PJDLOG_MODE_SOCK);
#else
assert(mode == PJDLOG_MODE_STD || mode == PJDLOG_MODE_SYSLOG);
#endif
saved_errno = errno;
if (pjdlog_initialized == PJDLOG_NEVER_INITIALIZED) {
__use_xprintf = 1;
register_printf_render_std("T");
register_printf_render('N',
pjdlog_printf_render_humanized_number,
pjdlog_printf_arginfo_humanized_number);
register_printf_render('I',
pjdlog_printf_render_sockaddr_ip,
pjdlog_printf_arginfo_sockaddr);
register_printf_render('S',
pjdlog_printf_render_sockaddr,
pjdlog_printf_arginfo_sockaddr);
}
if (mode == PJDLOG_MODE_SYSLOG)
openlog(NULL, LOG_PID | LOG_NDELAY, LOG_LOCAL0);
pjdlog_mode = mode;
pjdlog_debug_level = 0;
pjdlog_prefix_current = 0;
pjdlog_prefix[0][0] = '\0';
pjdlog_initialized = PJDLOG_INITIALIZED;
pjdlog_sock = -1;
errno = saved_errno;
}
void
pjdlog_fini(void)
{
int saved_errno;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
saved_errno = errno;
if (pjdlog_mode == PJDLOG_MODE_SYSLOG)
closelog();
pjdlog_initialized = PJDLOG_NOT_INITIALIZED;
pjdlog_sock = -1;
errno = saved_errno;
}
/*
* Configure where the logs should go.
* By default they are send to stdout/stderr, but after going into background
* (eg. by calling daemon(3)) application is responsible for changing mode to
* PJDLOG_MODE_SYSLOG, so logs will be send to syslog.
*/
void
pjdlog_mode_set(int mode)
{
int saved_errno;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
#ifdef notyet
assert(mode == PJDLOG_MODE_STD || mode == PJDLOG_MODE_SYSLOG ||
mode == PJDLOG_MODE_SOCK);
#else
assert(mode == PJDLOG_MODE_STD || mode == PJDLOG_MODE_SYSLOG);
#endif
if (pjdlog_mode == mode)
return;
saved_errno = errno;
if (mode == PJDLOG_MODE_SYSLOG)
openlog(NULL, LOG_PID | LOG_NDELAY, LOG_DAEMON);
else if (mode == PJDLOG_MODE_STD)
closelog();
if (mode != PJDLOG_MODE_SOCK)
pjdlog_sock = -1;
pjdlog_mode = mode;
errno = saved_errno;
}
/*
* Return current mode.
*/
int
pjdlog_mode_get(void)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
return (pjdlog_mode);
}
#ifdef notyet
/*
* Sets socket number to use for PJDLOG_MODE_SOCK mode.
*/
void
pjdlog_sock_set(int sock)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(pjdlog_mode == PJDLOG_MODE_SOCK);
assert(sock >= 0);
pjdlog_sock = sock;
}
#endif
#ifdef notyet
/*
* Returns socket number used for PJDLOG_MODE_SOCK mode.
*/
int
pjdlog_sock_get(void)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(pjdlog_mode == PJDLOG_MODE_SOCK);
assert(pjdlog_sock >= 0);
return (pjdlog_sock);
}
#endif
/*
* Set debug level. All the logs above the level specified here will be
* ignored.
*/
void
pjdlog_debug_set(int level)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(level >= 0);
assert(level <= 127);
pjdlog_debug_level = level;
}
/*
* Return current debug level.
*/
int
pjdlog_debug_get(void)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
return (pjdlog_debug_level);
}
/*
* Set prefix that will be used before each log.
*/
void
pjdlog_prefix_set(const char *fmt, ...)
{
va_list ap;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
va_start(ap, fmt);
pjdlogv_prefix_set(fmt, ap);
va_end(ap);
}
/*
* Set prefix that will be used before each log.
*/
void
pjdlogv_prefix_set(const char *fmt, va_list ap)
{
int saved_errno;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(fmt != NULL);
saved_errno = errno;
vsnprintf(pjdlog_prefix[pjdlog_prefix_current],
sizeof(pjdlog_prefix[pjdlog_prefix_current]), fmt, ap);
errno = saved_errno;
}
/*
* Get current prefix.
*/
const char *
pjdlog_prefix_get(void)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
return (pjdlog_prefix[pjdlog_prefix_current]);
}
/*
* Set new prefix and put the current one on the stack.
*/
void
pjdlog_prefix_push(const char *fmt, ...)
{
va_list ap;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
va_start(ap, fmt);
pjdlogv_prefix_push(fmt, ap);
va_end(ap);
}
/*
* Set new prefix and put the current one on the stack.
*/
void
pjdlogv_prefix_push(const char *fmt, va_list ap)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(pjdlog_prefix_current < PJDLOG_PREFIX_STACK - 1);
pjdlog_prefix_current++;
pjdlogv_prefix_set(fmt, ap);
}
/*
* Removes current prefix and recovers previous one from the stack.
*/
void
pjdlog_prefix_pop(void)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(pjdlog_prefix_current > 0);
pjdlog_prefix_current--;
}
/*
* Convert log level into string.
*/
static const char *
pjdlog_level_to_string(int loglevel)
{
switch (loglevel) {
case LOG_EMERG:
return ("EMERG");
case LOG_ALERT:
return ("ALERT");
case LOG_CRIT:
return ("CRIT");
case LOG_ERR:
return ("ERROR");
case LOG_WARNING:
return ("WARNING");
case LOG_NOTICE:
return ("NOTICE");
case LOG_INFO:
return ("INFO");
case LOG_DEBUG:
return ("DEBUG");
}
assert(!"Invalid log level.");
abort(); /* XXX: gcc */
}
static int
vsnprlcat(char *str, size_t size, const char *fmt, va_list ap)
{
size_t len;
len = strlen(str);
assert(len < size);
return (vsnprintf(str + len, size - len, fmt, ap));
}
static int
snprlcat(char *str, size_t size, const char *fmt, ...)
{
va_list ap;
int result;
va_start(ap, fmt);
result = vsnprlcat(str, size, fmt, ap);
va_end(ap);
return (result);
}
static void
pjdlogv_common_single_line(const char *func, const char *file, int line,
int loglevel, int debuglevel, int error, const char *msg)
{
static char log[2 * PJDLOG_MAX_MSGSIZE];
char *logp;
size_t logs;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
#ifdef notyet
assert(pjdlog_mode == PJDLOG_MODE_STD ||
pjdlog_mode == PJDLOG_MODE_SYSLOG ||
pjdlog_mode == PJDLOG_MODE_SOCK);
#else
assert(pjdlog_mode == PJDLOG_MODE_STD ||
pjdlog_mode == PJDLOG_MODE_SYSLOG);
#endif
assert(pjdlog_mode != PJDLOG_MODE_SOCK || pjdlog_sock >= 0);
assert(loglevel == LOG_EMERG || loglevel == LOG_ALERT ||
loglevel == LOG_CRIT || loglevel == LOG_ERR ||
loglevel == LOG_WARNING || loglevel == LOG_NOTICE ||
loglevel == LOG_INFO || loglevel == LOG_DEBUG);
assert(loglevel != LOG_DEBUG || debuglevel > 0);
assert(loglevel != LOG_DEBUG || debuglevel <= pjdlog_debug_level);
assert(debuglevel <= 127);
assert(error >= -1);
assert((file != NULL && line > 0) ||
(func == NULL && file == NULL && line == 0));
switch (pjdlog_mode) {
case PJDLOG_MODE_STD:
case PJDLOG_MODE_SYSLOG:
logp = log;
logs = sizeof(log);
break;
case PJDLOG_MODE_SOCK:
logp = log + 4;
logs = sizeof(log) - 4;
break;
default:
assert(!"Invalid mode.");
}
*logp = '\0';
if (pjdlog_mode != PJDLOG_MODE_SOCK) {
if (loglevel == LOG_DEBUG) {
/* Attach debuglevel if this is debug log. */
snprlcat(logp, logs, "[%s%d] ",
pjdlog_level_to_string(loglevel), debuglevel);
} else {
snprlcat(logp, logs, "[%s] ",
pjdlog_level_to_string(loglevel));
}
if (pjdlog_mode != PJDLOG_MODE_SYSLOG &&
pjdlog_debug_level >= 1) {
snprlcat(logp, logs, "(pid=%d) ", getpid());
}
}
/* Attach file, func, line if debuglevel is 2 or more. */
if (pjdlog_debug_level >= 2 && file != NULL) {
if (func == NULL)
snprlcat(logp, logs, "(%s:%d) ", file, line);
else
snprlcat(logp, logs, "(%s:%d:%s) ", file, line, func);
}
if (pjdlog_mode != PJDLOG_MODE_SOCK) {
snprlcat(logp, logs, "%s",
pjdlog_prefix[pjdlog_prefix_current]);
}
strlcat(logp, msg, logs);
/* Attach error description. */
if (error != -1)
snprlcat(logp, logs, ": %s.", strerror(error));
switch (pjdlog_mode) {
case PJDLOG_MODE_STD:
fprintf(stderr, "%s\n", logp);
fflush(stderr);
break;
case PJDLOG_MODE_SYSLOG:
syslog(loglevel, "%s", logp);
break;
#ifdef notyet
case PJDLOG_MODE_SOCK:
{
char ack[2];
uint16_t dlen;
log[2] = loglevel;
log[3] = debuglevel;
dlen = strlen(logp) + 3; /* +3 = loglevel, debuglevel and terminating \0 */
bcopy(&dlen, log, sizeof(dlen));
if (robust_send(pjdlog_sock, log, (size_t)dlen + 2) == -1) /* +2 for size */
assert(!"Unable to send log.");
if (robust_recv(pjdlog_sock, ack, sizeof(ack)) == -1)
assert(!"Unable to send log.");
break;
}
#endif
default:
assert(!"Invalid mode.");
}
}
/*
* Common log routine, which can handle regular log level as well as debug
* level. We decide here where to send the logs (stdout/stderr or syslog).
*/
void
_pjdlogv_common(const char *func, const char *file, int line, int loglevel,
int debuglevel, int error, const char *fmt, va_list ap)
{
char log[PJDLOG_MAX_MSGSIZE];
char *logp, *curline;
const char *prvline;
int saved_errno;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
assert(pjdlog_mode == PJDLOG_MODE_STD ||
pjdlog_mode == PJDLOG_MODE_SYSLOG ||
pjdlog_mode == PJDLOG_MODE_SOCK);
assert(pjdlog_mode != PJDLOG_MODE_SOCK || pjdlog_sock >= 0);
assert(loglevel == LOG_EMERG || loglevel == LOG_ALERT ||
loglevel == LOG_CRIT || loglevel == LOG_ERR ||
loglevel == LOG_WARNING || loglevel == LOG_NOTICE ||
loglevel == LOG_INFO || loglevel == LOG_DEBUG);
assert(loglevel != LOG_DEBUG || debuglevel > 0);
assert(debuglevel <= 127);
assert(error >= -1);
/* Ignore debug above configured level. */
if (loglevel == LOG_DEBUG && debuglevel > pjdlog_debug_level)
return;
saved_errno = errno;
vsnprintf(log, sizeof(log), fmt, ap);
logp = log;
prvline = NULL;
while ((curline = strsep(&logp, "\n")) != NULL) {
if (*curline == '\0')
continue;
if (prvline != NULL) {
pjdlogv_common_single_line(func, file, line, loglevel,
debuglevel, -1, prvline);
}
prvline = curline;
}
if (prvline == NULL)
prvline = "";
pjdlogv_common_single_line(func, file, line, loglevel, debuglevel,
error, prvline);
errno = saved_errno;
}
/*
* Common log routine.
*/
void
_pjdlog_common(const char *func, const char *file, int line, int loglevel,
int debuglevel, int error, const char *fmt, ...)
{
va_list ap;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
va_start(ap, fmt);
_pjdlogv_common(func, file, line, loglevel, debuglevel, error, fmt, ap);
va_end(ap);
}
/*
* Log error, errno and exit.
*/
void
_pjdlogv_exit(const char *func, const char *file, int line, int exitcode,
int error, const char *fmt, va_list ap)
{
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
_pjdlogv_common(func, file, line, exitcode == 0 ? LOG_INFO : LOG_ERR, 0,
error, fmt, ap);
exit(exitcode);
/* NOTREACHED */
}
/*
* Log error, errno and exit.
*/
void
_pjdlog_exit(const char *func, const char *file, int line, int exitcode,
int error, const char *fmt, ...)
{
va_list ap;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
va_start(ap, fmt);
_pjdlogv_exit(func, file, line, exitcode, error, fmt, ap);
/* NOTREACHED */
va_end(ap);
}
/*
* Log failure message and exit.
*/
void
_pjdlog_abort(const char *func, const char *file, int line,
int error, const char *failedexpr, const char *fmt, ...)
{
va_list ap;
assert(pjdlog_initialized == PJDLOG_INITIALIZED);
/*
* Set pjdlog_debug_level to 2, so that file, line and func are
* included in log. This is fine as we will exit anyway.
*/
if (pjdlog_debug_level < 2)
pjdlog_debug_level = 2;
/*
* When there is no message we pass __func__ as 'fmt'.
* It would be cleaner to pass NULL or "", but gcc generates a warning
* for both of those.
*/
if (fmt != func) {
va_start(ap, fmt);
_pjdlogv_common(func, file, line, LOG_CRIT, 0, -1, fmt, ap);
va_end(ap);
}
if (failedexpr == NULL) {
_pjdlog_common(func, file, line, LOG_CRIT, 0, -1, "Aborted.");
} else {
_pjdlog_common(func, file, line, LOG_CRIT, 0, -1,
"Assertion failed: (%s).", failedexpr);
}
if (error != -1)
_pjdlog_common(func, file, line, LOG_CRIT, 0, error, "Errno");
abort();
}
#ifdef notyet
/*
* Receive log from the given socket.
*/
int
pjdlog_receive(int sock)
{
char log[PJDLOG_MAX_MSGSIZE];
int loglevel, debuglevel;
uint16_t dlen;
if (robust_recv(sock, &dlen, sizeof(dlen)) == -1)
return (-1);
PJDLOG_ASSERT(dlen > 0);
PJDLOG_ASSERT(dlen <= PJDLOG_MAX_MSGSIZE - 3);
if (robust_recv(sock, log, (size_t)dlen) == -1)
return (-1);
log[dlen - 1] = '\0';
loglevel = log[0];
debuglevel = log[1];
_pjdlog_common(NULL, NULL, 0, loglevel, debuglevel, -1, "%s", log + 2);
if (robust_send(sock, "ok", 2) == -1)
return (-1);
return (0);
}
#endif