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/* ulogd_LOGEMU.c
*
* ulogd output target for syslog logging emulation
*
* This target produces a file which looks the same like the syslog-entries
* of the LOG target.
*
* (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <ulogd/ulogd.h>
#include <ulogd/conffile.h>
#ifndef HOST_NAME_MAX
#warning this libc does not define HOST_NAME_MAX
#define HOST_NAME_MAX (255+1)
#endif
#ifndef ULOGD_LOGEMU_DEFAULT
#define ULOGD_LOGEMU_DEFAULT "/var/log/ulogd.syslogemu"
#endif
#ifndef ULOGD_LOGEMU_SYNC_DEFAULT
#define ULOGD_LOGEMU_SYNC_DEFAULT 0
#endif
static char hostname[HOST_NAME_MAX+1];
static struct ulogd_key logemu_inp[] = {
{
.type = ULOGD_RET_STRING,
.name = "print",
},
{
.type = ULOGD_RET_UINT32,
.flags = ULOGD_KEYF_OPTIONAL,
.name = "oob.time.sec",
},
};
static struct config_keyset logemu_kset = {
.num_ces = 2,
.ces = {
{
.key = "file",
.type = CONFIG_TYPE_STRING,
.options = CONFIG_OPT_NONE,
.u = { .string = ULOGD_LOGEMU_DEFAULT },
},
{
.key = "sync",
.type = CONFIG_TYPE_INT,
.options = CONFIG_OPT_NONE,
.u = { .value = ULOGD_LOGEMU_SYNC_DEFAULT },
},
},
};
struct logemu_instance {
FILE *of;
};
static int _output_logemu(struct ulogd_pluginstance *upi)
{
struct logemu_instance *li = (struct logemu_instance *) &upi->private;
struct ulogd_key *res = upi->input.keys;
if (res[0].u.source->flags & ULOGD_RETF_VALID) {
char *timestr;
char *tmp;
time_t now;
if (res[1].u.source && (res[1].u.source->flags & ULOGD_RETF_VALID))
now = (time_t) res[1].u.source->u.value.ui32;
else
now = time(NULL);
timestr = ctime(&now) + 4;
if ((tmp = strchr(timestr, '\n')))
*tmp = '\0';
fprintf(li->of, "%.15s %s %s", timestr, hostname,
(char *) res[0].u.source->u.value.ptr);
if (upi->config_kset->ces[1].u.value)
fflush(li->of);
}
return ULOGD_IRET_OK;
}
static void signal_handler_logemu(struct ulogd_pluginstance *pi, int signal)
{
struct logemu_instance *li = (struct logemu_instance *) &pi->private;
FILE *old = li->of;
switch (signal) {
case SIGHUP:
ulogd_log(ULOGD_NOTICE, "syslogemu: reopening logfile\n");
li->of = fopen(pi->config_kset->ces[0].u.string, "a");
if (!li->of) {
ulogd_log(ULOGD_ERROR, "can't reopen syslogemu: %s\n",
strerror(errno));
li->of = old;
} else {
fclose(old);
}
break;
default:
break;
}
}
static int start_logemu(struct ulogd_pluginstance *pi)
{
struct logemu_instance *li = (struct logemu_instance *) &pi->private;
char *tmp;
ulogd_log(ULOGD_DEBUG, "starting logemu\n");
#ifdef DEBUG_LOGEMU
li->of = stdout;
#else
ulogd_log(ULOGD_DEBUG, "opening file: %s\n",
pi->config_kset->ces[0].u.string);
li->of = fopen(pi->config_kset->ces[0].u.string, "a");
if (!li->of) {
ulogd_log(ULOGD_FATAL, "can't open syslogemu: %s\n",
strerror(errno));
return -errno;
}
#endif
if (gethostname(hostname, sizeof(hostname)) < 0) {
ulogd_log(ULOGD_FATAL, "can't gethostname(): %s\n",
strerror(errno));
return -EINVAL;
}
/* truncate hostname */
if ((tmp = strchr(hostname, '.')))
*tmp = '\0';
return 0;
}
static int fini_logemu(struct ulogd_pluginstance *pi) {
struct logemu_instance *li = (struct logemu_instance *) &pi->private;
if (li->of != stdout)
fclose(li->of);
return 0;
}
static int configure_logemu(struct ulogd_pluginstance *pi,
struct ulogd_pluginstance_stack *stack)
{
ulogd_log(ULOGD_DEBUG, "parsing config file section %s\n", pi->id);
return config_parse_file(pi->id, pi->config_kset);
}
static struct ulogd_plugin logemu_plugin = {
.name = "LOGEMU",
.input = {
.keys = logemu_inp,
.num_keys = ARRAY_SIZE(logemu_inp),
.type = ULOGD_DTYPE_PACKET | ULOGD_DTYPE_FLOW,
},
.output = {
.type = ULOGD_DTYPE_SINK,
},
.config_kset = &logemu_kset,
.priv_size = sizeof(struct logemu_instance),
.configure = &configure_logemu,
.start = &start_logemu,
.stop = &fini_logemu,
.interp = &_output_logemu,
.signal = &signal_handler_logemu,
.version = VERSION,
};
void __attribute__ ((constructor)) init(void);
void init(void)
{
ulogd_register_plugin(&logemu_plugin);
}
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