158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)dmesg.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#include <sys/cdefs.h>
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#include <sys/msgbuf.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <vis.h>
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struct nlist nl[] = {
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#define X_MSGBUF 0
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{ "_msgbufp" },
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{ NULL },
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};
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void usage __P((void));
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#define KREAD(addr, var) \
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kvm_read(kd, addr, &var, sizeof(var)) != sizeof(var)
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register int ch, newl, skip;
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register char *p, *ep;
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struct msgbuf *bufp, cur;
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char *memf, *nlistf;
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kvm_t *kd;
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char buf[5];
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memf = nlistf = NULL;
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while ((ch = getopt(argc, argv, "M:N:")) != EOF)
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switch(ch) {
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case 'M':
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memf = optarg;
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break;
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case 'N':
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nlistf = optarg;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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/*
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* Discard setgid privileges if not the running kernel so that bad
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* guys can't print interesting stuff from kernel memory.
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*/
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if (memf != NULL || nlistf != NULL)
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setgid(getgid());
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/* Read in kernel message buffer, do sanity checks. */
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if ((kd = kvm_open(nlistf, memf, NULL, O_RDONLY, "dmesg")) == NULL)
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exit (1);
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if (kvm_nlist(kd, nl) == -1)
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errx(1, "kvm_nlist: %s", kvm_geterr(kd));
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if (nl[X_MSGBUF].n_type == 0)
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errx(1, "%s: msgbufp not found", nlistf ? nlistf : "namelist");
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if (KREAD(nl[X_MSGBUF].n_value, bufp) || KREAD((long)bufp, cur))
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errx(1, "kvm_read: %s", kvm_geterr(kd));
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kvm_close(kd);
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if (cur.msg_magic != MSG_MAGIC)
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errx(1, "magic number incorrect");
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if (cur.msg_bufx >= MSG_BSIZE)
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cur.msg_bufx = 0;
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/*
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* The message buffer is circular; start at the read pointer, and
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* go to the write pointer - 1.
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*/
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p = cur.msg_bufc + cur.msg_bufx;
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ep = cur.msg_bufc + cur.msg_bufx - 1;
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for (newl = skip = 0; p != ep; ++p) {
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if (p == cur.msg_bufc + MSG_BSIZE)
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p = cur.msg_bufc;
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ch = *p;
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/* Skip "\n<.*>" syslog sequences. */
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if (skip) {
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if (ch == '>')
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newl = skip = 0;
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continue;
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}
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if (newl && ch == '<') {
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skip = 1;
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continue;
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}
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if (ch == '\0')
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continue;
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newl = ch == '\n';
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(void)vis(buf, ch, 0, 0);
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if (buf[1] == 0)
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(void)putchar(buf[0]);
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else
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(void)printf("%s", buf);
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}
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if (!newl)
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(void)putchar('\n');
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exit(0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: dmesg [-M core] [-N system]\n");
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exit(1);
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}
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