/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2017 Mariusz Zaborski <oshogbo@FreeBSD.org>
* 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.
*
* 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/dnv.h>
#include <sys/nv.h>
#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <libcasper.h>
#include <libcasper_service.h>
#include "cap_syslog.h"
#define CAP_SYSLOG_LIMIT 2048
void
cap_syslog(cap_channel_t *chan, int pri, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
cap_vsyslog(chan, pri, fmt, ap);
va_end(ap);
}
void
cap_vsyslog(cap_channel_t *chan, int priority, const char *fmt, va_list ap)
{
nvlist_t *nvl;
char message[CAP_SYSLOG_LIMIT];
(void)vsnprintf(message, sizeof(message), fmt, ap);
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "vsyslog");
nvlist_add_number(nvl, "priority", priority);
nvlist_add_string(nvl, "message", message);
nvl = cap_xfer_nvlist(chan, nvl);
if (nvl == NULL) {
return;
}
nvlist_destroy(nvl);
}
void
cap_openlog(cap_channel_t *chan, const char *ident, int logopt, int facility)
{
nvlist_t *nvl;
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "openlog");
if (ident != NULL) {
nvlist_add_string(nvl, "ident", ident);
}
nvlist_add_number(nvl, "logopt", logopt);
nvlist_add_number(nvl, "facility", facility);
if (logopt & LOG_PERROR) {
nvlist_add_descriptor(nvl, "stderr", STDERR_FILENO);
}
nvl = cap_xfer_nvlist(chan, nvl);
if (nvl == NULL) {
return;
}
nvlist_destroy(nvl);
}
void
cap_closelog(cap_channel_t *chan)
{
nvlist_t *nvl;
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "closelog");
nvl = cap_xfer_nvlist(chan, nvl);
if (nvl == NULL) {
return;
}
nvlist_destroy(nvl);
}
int
cap_setlogmask(cap_channel_t *chan, int maskpri)
{
nvlist_t *nvl;
int omask;
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "setlogmask");
nvlist_add_number(nvl, "maskpri", maskpri);
nvl = cap_xfer_nvlist(chan, nvl);
omask = nvlist_get_number(nvl, "omask");
nvlist_destroy(nvl);
return (omask);
}
/*
* Service functions.
*/
static char *LogTag;
static int prev_stderr = -1;
static void
slog_vsyslog(const nvlist_t *limits __unused, const nvlist_t *nvlin,
nvlist_t *nvlout __unused)
{
syslog(nvlist_get_number(nvlin, "priority"), "%s",
nvlist_get_string(nvlin, "message"));
}
static void
slog_openlog(const nvlist_t *limits __unused, const nvlist_t *nvlin,
nvlist_t *nvlout __unused)
{
const char *ident;
uint64_t logopt;
int stderr_fd;
ident = dnvlist_get_string(nvlin, "ident", NULL);
if (ident != NULL) {
free(LogTag);
LogTag = strdup(ident);
}
logopt = nvlist_get_number(nvlin, "logopt");
if (logopt & LOG_PERROR) {
stderr_fd = dnvlist_get_descriptor(nvlin, "stderr", -1);
if (prev_stderr == -1)
prev_stderr = dup(STDERR_FILENO);
if (prev_stderr != -1)
(void)dup2(stderr_fd, STDERR_FILENO);
} else if (prev_stderr != -1) {
(void)dup2(prev_stderr, STDERR_FILENO);
close(prev_stderr);
prev_stderr = -1;
}
openlog(LogTag, logopt, nvlist_get_number(nvlin, "facility"));
}
static void
slog_closelog(const nvlist_t *limits __unused, const nvlist_t *nvlin __unused,
nvlist_t *nvlout __unused)
{
closelog();
free(LogTag);
LogTag = NULL;
if (prev_stderr != -1) {
(void)dup2(prev_stderr, STDERR_FILENO);
close(prev_stderr);
prev_stderr = -1;
}
}
static void
slog_setlogmask(const nvlist_t *limits __unused, const nvlist_t *nvlin,
nvlist_t *nvlout)
{
int omask;
omask = setlogmask(nvlist_get_number(nvlin, "maskpri"));
nvlist_add_number(nvlout, "omask", omask);
}
static int
syslog_command(const char *cmd, const nvlist_t *limits, nvlist_t *nvlin,
nvlist_t *nvlout)
{
if (strcmp(cmd, "vsyslog") == 0) {
slog_vsyslog(limits, nvlin, nvlout);
} else if (strcmp(cmd, "openlog") == 0) {
slog_openlog(limits, nvlin, nvlout);
} else if (strcmp(cmd, "closelog") == 0) {
slog_closelog(limits, nvlin, nvlout);
} else if (strcmp(cmd, "setlogmask") == 0) {
slog_setlogmask(limits, nvlin, nvlout);
} else {
return (EINVAL);
}
return (0);
}
CREATE_SERVICE("system.syslog", NULL, syslog_command, 0);