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/* $OpenBSD: logflush.c,v 1.2 2021/10/24 21:24:21 deraadt Exp $ */
/*
* Copyright (c) 2021 Alexander Bluhm <bluhm@openbsd.org>
*
* 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 <sys/ioctl.h>
#include <sys/socket.h>
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
__dead void
usage()
{
fprintf(stderr, "usage: %s\n", getprogname());
exit(2);
}
int
main(int argc, char *argv[])
{
int pair[2], klog, val;
if (argc != 1)
usage();
if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pair) == -1)
err(1, "socketpair");
val = 1<<20;
if (setsockopt(pair[0], SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) == -1)
err(1, "setsockopt SO_RCVBUF");
if (setsockopt(pair[1], SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) == -1)
err(1, "setsockopt SO_SNDBUF");
if ((klog = open(_PATH_KLOG, O_RDONLY)) == -1)
err(1, "open %s", _PATH_KLOG);
/* Use /dev/klog to register sendsyslog(2) receiver. */
if (ioctl(klog, LIOCSFD, &pair[1]) == -1)
err(1, "ioctl klog LIOCSFD sendsyslog");
close(pair[1]);
/* Send message via libc, flushes log stash in kernel. */
openlog("syslogd-regress", LOG_PID, LOG_SYSLOG);
syslog(LOG_DEBUG, "logflush");
return 0;
}
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