201 lines
5.3 KiB
C
201 lines
5.3 KiB
C
/* $OpenBSD: dmesg.c,v 1.33 2022/12/04 23:50:46 cheloha Exp $ */
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/* $NetBSD: dmesg.c,v 1.8 1995/03/18 14:54:49 cgd Exp $ */
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/*-
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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. 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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#include <sys/types.h>
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#include <sys/msgbuf.h>
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#include <sys/sysctl.h>
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#include <err.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 <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <vis.h>
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#ifndef NOKVM
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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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#endif
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void usage(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(int argc, char *argv[])
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{
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int ch, newl, skip, i;
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char *p;
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struct msgbuf cur;
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char *memf, *nlistf, *bufdata = NULL;
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char *allocated = NULL;
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int startupmsgs = 0;
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char buf[5];
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memf = nlistf = NULL;
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while ((ch = getopt(argc, argv, "sM:N:")) != -1)
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switch(ch) {
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case 's':
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startupmsgs = 1;
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break;
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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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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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if (argc != 0)
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usage();
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if (memf == NULL && nlistf == NULL) {
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int mib[2], msgbufsize;
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size_t len;
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mib[0] = CTL_KERN;
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mib[1] = startupmsgs ? KERN_CONSBUFSIZE : KERN_MSGBUFSIZE;
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len = sizeof(msgbufsize);
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if (sysctl(mib, 2, &msgbufsize, &len, NULL, 0))
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err(1, "sysctl: %s", startupmsgs ? "KERN_CONSBUFSIZE" :
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"KERN_MSGBUFSIZE");
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msgbufsize += offsetof(struct msgbuf, msg_bufc);
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allocated = bufdata = calloc(1, msgbufsize);
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if (bufdata == NULL)
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errx(1, "couldn't allocate space for buffer data");
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mib[1] = startupmsgs ? KERN_CONSBUF : KERN_MSGBUF;
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len = msgbufsize;
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if (sysctl(mib, 2, bufdata, &len, NULL, 0))
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err(1, "sysctl: %s",
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startupmsgs ? "KERN_CONSBUF" : "KERN_MSGBUF");
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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memcpy(&cur, bufdata, sizeof(cur));
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bufdata = ((struct msgbuf *)bufdata)->msg_bufc;
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} else {
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#ifndef NOKVM
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struct msgbuf *bufp;
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kvm_t *kd;
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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,
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"dmesg")) == NULL)
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return (1);
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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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",
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nlistf ? nlistf : "namelist");
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if (KREAD(nl[X_MSGBUF].n_value, bufp))
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errx(1, "kvm_read: %s: (0x%lx)", kvm_geterr(kd),
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nl[X_MSGBUF].n_value);
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if (KREAD((long)bufp, cur))
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errx(1, "kvm_read: %s (%0lx)", kvm_geterr(kd),
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(unsigned long)bufp);
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if (cur.msg_magic != MSG_MAGIC)
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errx(1, "magic number incorrect");
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allocated = bufdata = malloc(cur.msg_bufs);
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if (bufdata == NULL)
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errx(1, "couldn't allocate space for buffer data");
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if (kvm_read(kd, (long)&bufp->msg_bufc, bufdata,
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cur.msg_bufs) != cur.msg_bufs)
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errx(1, "kvm_read: %s", kvm_geterr(kd));
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kvm_close(kd);
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#endif
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}
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if (cur.msg_bufx >= cur.msg_bufs)
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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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for (newl = skip = i = 0, p = bufdata + cur.msg_bufx;
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i < cur.msg_bufs; i++, p++) {
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if (p == bufdata + cur.msg_bufs)
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p = bufdata;
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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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vis(buf, ch, 0, 0);
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if (buf[1] == 0)
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putchar(buf[0]);
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else
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printf("%s", buf);
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}
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if (!newl)
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putchar('\n');
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free(allocated);
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return (0);
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}
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void
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usage(void)
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{
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extern char *__progname;
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fprintf(stderr, "usage: %s [-s] [-M core] [-N system]\n", __progname);
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exit(1);
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}
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