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/*
* Copyright (c) 2021, 2023 Omar Polo <op@omarpolo.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "gmid.h"
#include <sys/types.h>
#include <sys/uio.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <netdb.h>
#include <poll.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include "log.h"
#include "proc.h"
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
static int logfd = -1;
static int log_to_syslog = 1;
static int facility = LOG_DAEMON;
static void logger_init(struct privsep *, struct privsep_proc *, void *);
static void logger_shutdown(void);
static int logger_dispatch_parent(int, struct privsep_proc *, struct imsg *);
static int logger_dispatch_server(int, struct privsep_proc *, struct imsg *);
static struct privsep_proc procs[] = {
{ "parent", PROC_PARENT, logger_dispatch_parent },
{ "server", PROC_SERVER, logger_dispatch_server },
};
void
logger(struct privsep *ps, struct privsep_proc *p)
{
proc_run(ps, p, procs, nitems(procs), logger_init, NULL);
}
static void
logger_init(struct privsep *ps, struct privsep_proc *p, void *arg)
{
p->p_shutdown = logger_shutdown;
openlog(getprogname(), LOG_NDELAY, LOG_DAEMON);
tzset();
sandbox_logger_process();
}
static void
logger_shutdown(void)
{
closelog();
if (logfd != -1)
close(logfd);
}
static int
logger_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
{
switch (imsg_get_type(imsg)) {
case IMSG_LOG_FACILITY:
if (imsg_get_data(imsg, &facility, sizeof(facility)) == -1)
fatal("corrupted IMSG_LOG_SYSLOG");
break;
case IMSG_LOG_SYSLOG:
if (imsg_get_data(imsg, &log_to_syslog,
sizeof(log_to_syslog)) == -1)
fatal("corrupted IMSG_LOG_SYSLOG");
break;
case IMSG_LOG_ACCESS:
if (logfd != -1)
close(logfd);
logfd = imsg_get_fd(imsg);
break;
default:
return -1;
}
return 0;
}
static int
logger_dispatch_server(int fd, struct privsep_proc *p, struct imsg *imsg)
{
char *msg;
size_t datalen = 0;
struct ibuf ibuf;
switch (imsg_get_type(imsg)) {
case IMSG_LOG_REQUEST:
if (imsg_get_ibuf(imsg, &ibuf) == -1 ||
(datalen = ibuf_size(&ibuf)) == 0)
fatal("got invalid IMSG_LOG_REQUEST");
msg = ibuf_data(&ibuf);
msg[datalen - 1] = '\0';
if (logfd != -1)
dprintf(logfd, "%s\n", msg);
if (log_to_syslog)
syslog(facility | LOG_NOTICE, "%s", msg);
break;
default:
return -1;
}
return 0;
}
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