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/*
ctdb logging code - syslog backend
Copyright (C) Andrew Tridgell 2008
Copyright (C) Martin Schwenke 2014
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/network.h"
#include "system/syslog.h"
#include "lib/util/debug.h"
#include "lib/util/blocking.h"
#include "ctdb_logging.h"
/* Linux and FreeBSD define this appropriately - try good old /dev/log
* for anything that doesn't... */
#ifndef _PATH_LOG
#define _PATH_LOG "/dev/log"
#endif
#define CTDB_LOG_SYSLOG_PREFIX "syslog"
#define CTDB_SYSLOG_FACILITY LOG_USER
struct ctdb_syslog_sock_state {
int fd;
const char *app_name;
};
/**********************************************************************/
static int ctdb_debug_to_syslog_level(int dbglevel)
{
int level;
switch (dbglevel) {
case DEBUG_ERR:
level = LOG_ERR;
break;
case DEBUG_WARNING:
level = LOG_WARNING;
break;
case DEBUG_NOTICE:
level = LOG_NOTICE;
break;
case DEBUG_INFO:
level = LOG_INFO;
break;
default:
level = LOG_DEBUG;
break;
}
return level;
}
/**********************************************************************/
/* Format messages as per RFC3164. */
/* It appears that some syslog daemon implementations do not allow a
* hostname when messages are sent via a Unix domain socket, so omit
* it. A timestamp could be sent but rsyslogd on Linux limits the
* timestamp logged to the precision that was received on /dev/log.
* It seems sane to send degenerate RFC3164 messages without a header
* at all, so that the daemon will generate high resolution timestamps
* if configured. */
static int format_rfc3164(int dbglevel, struct ctdb_syslog_sock_state *state,
const char *str, char *buf, int bsize)
{
int pri;
int len;
pri = CTDB_SYSLOG_FACILITY | ctdb_debug_to_syslog_level(dbglevel);
len = snprintf(buf, bsize, "<%d>%s[%u]: %s%s",
pri, state->app_name, getpid(), debug_extra, str);
len = MIN(len, bsize - 1);
return len;
}
/**********************************************************************/
/* Non-blocking logging */
static void ctdb_log_to_syslog_sock(void *private_ptr,
int dbglevel, const char *str)
{
struct ctdb_syslog_sock_state *state = talloc_get_type(
private_ptr, struct ctdb_syslog_sock_state);
/* RFC3164 says: The total length of the packet MUST be 1024
bytes or less. */
char buf[1024];
int n;
n = format_rfc3164(dbglevel, state, str, buf, sizeof(buf));
if (n == -1) {
fprintf(stderr, "Failed to format syslog message %s\n", str);
return;
}
/* Could extend this to count failures, which probably
* indicate dropped messages due to EAGAIN or EWOULDBLOCK */
(void)send(state->fd, buf, n, 0);
}
static int
ctdb_syslog_sock_state_destructor(struct ctdb_syslog_sock_state *state)
{
if (state->fd != -1) {
close(state->fd);
state->fd = -1;
}
return 0;
}
static int ctdb_log_setup_syslog_un(TALLOC_CTX *mem_ctx,
const char *app_name)
{
struct ctdb_syslog_sock_state *state;
struct sockaddr_un dest;
int ret;
state = talloc_zero(mem_ctx, struct ctdb_syslog_sock_state);
if (state == NULL) {
return ENOMEM;
}
state->fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (state->fd == -1) {
int save_errno = errno;
talloc_free(state);
return save_errno;
}
dest.sun_family = AF_UNIX;
strncpy(dest.sun_path, _PATH_LOG, sizeof(dest.sun_path)-1);
ret = connect(state->fd,
(struct sockaddr *)&dest, sizeof(dest));
if (ret == -1) {
int save_errno = errno;
talloc_free(state);
return save_errno;
}
set_blocking(state->fd, false);
state->app_name = app_name;
talloc_set_destructor(state, ctdb_syslog_sock_state_destructor);
debug_set_callback(state, ctdb_log_to_syslog_sock);
return 0;
}
/**********************************************************************/
static void ctdb_log_to_syslog(void *private_ptr, int dbglevel, const char *s)
{
syslog(ctdb_debug_to_syslog_level(dbglevel),
"%s%s", debug_extra, s);
}
static int ctdb_log_setup_syslog(TALLOC_CTX *mem_ctx,
const char *logging,
const char *app_name)
{
size_t l = strlen(CTDB_LOG_SYSLOG_PREFIX);
if (logging[l] != '\0') {
/* Handle non-blocking extensions here */
const char *method;
if (logging[l] != ':') {
return EINVAL;
}
method = &logging[0] + l + 1;
if (strcmp(method, "nonblocking") == 0) {
ctdb_log_setup_syslog_un(mem_ctx, app_name);
return 0;
}
return EINVAL;
}
debug_set_callback(NULL, ctdb_log_to_syslog);
return 0;
}
void ctdb_log_init_syslog(void)
{
ctdb_log_register_backend(CTDB_LOG_SYSLOG_PREFIX,
ctdb_log_setup_syslog);
}
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