169 lines
4.7 KiB
C
169 lines
4.7 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1991, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static const char sccsid[] = "@(#)dmesg.c 8.1 (Berkeley) 6/5/93";
|
|
#endif
|
|
static const char rcsid[] =
|
|
"$Id: dmesg.c,v 1.6 1997/02/22 14:32:13 peter Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/msgbuf.h>
|
|
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <kvm.h>
|
|
#include <limits.h>
|
|
#include <locale.h>
|
|
#include <nlist.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <vis.h>
|
|
|
|
struct nlist nl[] = {
|
|
#define X_MSGBUF 0
|
|
{ "_msgbufp" },
|
|
{ NULL },
|
|
};
|
|
|
|
void usage __P((void));
|
|
|
|
#define KREAD(addr, var) \
|
|
kvm_read(kd, addr, &var, sizeof(var)) != sizeof(var)
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
register int ch, newl, skip;
|
|
register char *p, *ep;
|
|
struct msgbuf *bufp, cur;
|
|
char *memf, *nlistf;
|
|
kvm_t *kd;
|
|
char buf[5];
|
|
|
|
(void) setlocale(LC_CTYPE, "");
|
|
memf = nlistf = NULL;
|
|
while ((ch = getopt(argc, argv, "M:N:")) != -1)
|
|
switch(ch) {
|
|
case 'M':
|
|
memf = optarg;
|
|
break;
|
|
case 'N':
|
|
nlistf = optarg;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
/*
|
|
* Discard setgid privileges if not the running kernel so that bad
|
|
* guys can't print interesting stuff from kernel memory.
|
|
*/
|
|
if (memf != NULL || nlistf != NULL)
|
|
setgid(getgid());
|
|
|
|
/* Read in kernel message buffer, do sanity checks. */
|
|
if ((kd = kvm_open(nlistf, memf, NULL, O_RDONLY, "dmesg")) == NULL)
|
|
exit (1);
|
|
if (kvm_nlist(kd, nl) == -1)
|
|
errx(1, "kvm_nlist: %s", kvm_geterr(kd));
|
|
if (nl[X_MSGBUF].n_type == 0)
|
|
errx(1, "%s: msgbufp not found", nlistf ? nlistf : "namelist");
|
|
if (KREAD(nl[X_MSGBUF].n_value, bufp) || KREAD((long)bufp, cur))
|
|
errx(1, "kvm_read: %s", kvm_geterr(kd));
|
|
kvm_close(kd);
|
|
if (cur.msg_magic != MSG_MAGIC)
|
|
errx(1, "magic number incorrect");
|
|
if (cur.msg_bufx >= MSG_BSIZE)
|
|
cur.msg_bufx = 0;
|
|
|
|
/*
|
|
* The message buffer is circular. If the buffer has wrapped, the
|
|
* write pointer points to the oldest data. Otherwise, the write
|
|
* pointer points to \0's following the data. Read the entire
|
|
* buffer starting at the write pointer and ignore nulls so that
|
|
* we effectively start at the oldest data.
|
|
*/
|
|
p = cur.msg_bufc + cur.msg_bufx;
|
|
ep = (cur.msg_bufx == 0 ? cur.msg_bufc + MSG_BSIZE : p);
|
|
newl = skip = 0;
|
|
do {
|
|
if (p == cur.msg_bufc + MSG_BSIZE)
|
|
p = cur.msg_bufc;
|
|
ch = *p;
|
|
/* Skip "\n<.*>" syslog sequences. */
|
|
if (skip) {
|
|
if (ch == '>')
|
|
newl = skip = 0;
|
|
continue;
|
|
}
|
|
if (newl && ch == '<') {
|
|
skip = 1;
|
|
continue;
|
|
}
|
|
if (ch == '\0')
|
|
continue;
|
|
newl = ch == '\n';
|
|
(void)vis(buf, ch, 0, 0);
|
|
if (buf[1] == 0)
|
|
(void)putchar(buf[0]);
|
|
else
|
|
(void)printf("%s", buf);
|
|
} while (++p != ep);
|
|
if (!newl)
|
|
(void)putchar('\n');
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
(void)fprintf(stderr, "usage: dmesg [-M core] [-N system]\n");
|
|
exit(1);
|
|
}
|