720 lines
17 KiB
C
720 lines
17 KiB
C
/* $NetBSD: savecore.c,v 1.36 1998/04/01 15:15:58 kleink Exp $ */
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/*-
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* Copyright (c) 1986, 1992, 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1986, 1992, 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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#if 0
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static char sccsid[] = "@(#)savecore.c 8.5 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: savecore.c,v 1.36 1998/04/01 15:15:58 kleink Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/syslog.h>
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#include <sys/time.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <nlist.h>
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#include <paths.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 <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include <limits.h>
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#include <kvm.h>
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extern FILE *zopen __P((const char *fname, const char *mode, int bits));
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#define KREAD(kd, addr, p)\
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(kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p)))
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struct nlist current_nl[] = { /* Namelist for currently running system. */
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#define X_DUMPDEV 0
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{ "_dumpdev" },
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#define X_DUMPLO 1
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{ "_dumplo" },
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#define X_TIME 2
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{ "_time" },
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#define X_DUMPSIZE 3
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{ "_dumpsize" },
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#define X_VERSION 4
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{ "_version" },
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#define X_PANICSTR 5
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{ "_panicstr" },
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#define X_DUMPMAG 6
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{ "_dumpmag" },
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{ NULL },
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};
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int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 };
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int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 };
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struct nlist dump_nl[] = { /* Name list for dumped system. */
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{ "_dumpdev" }, /* Entries MUST be the same as */
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{ "_dumplo" }, /* those in current_nl[]. */
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{ "_time" },
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{ "_dumpsize" },
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{ "_version" },
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{ "_panicstr" },
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{ "_dumpmag" },
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{ NULL },
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};
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/* Types match kernel declarations. */
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long dumplo; /* where dump starts on dumpdev */
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int dumpmag; /* magic number in dump */
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int dumpsize; /* amount of memory dumped */
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char *kernel;
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char *dirname; /* directory to save dumps in */
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char *ddname; /* name of dump device */
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dev_t dumpdev; /* dump device */
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int dumpfd; /* read/write descriptor on block dev */
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kvm_t *kd_dump; /* kvm descriptor on block dev */
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time_t now; /* current date */
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char panic_mesg[1024];
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long panicstr;
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char vers[1024];
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int clear, compress, force, verbose; /* flags */
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void check_kmem __P((void));
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int check_space __P((void));
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void clear_dump __P((void));
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int Create __P((char *, int));
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int dump_exists __P((void));
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char *find_dev __P((dev_t, int));
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int get_crashtime __P((void));
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void kmem_setup __P((void));
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void log __P((int, char *, ...));
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void Lseek __P((int, off_t, int));
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int main __P((int, char *[]));
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int Open __P((char *, int rw));
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char *rawname __P((char *s));
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void save_core __P((void));
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void usage __P((void));
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void Write __P((int, void *, int));
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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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int ch;
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openlog("savecore", LOG_PERROR, LOG_DAEMON);
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while ((ch = getopt(argc, argv, "cdfN:vz")) != -1)
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switch(ch) {
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case 'c':
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clear = 1;
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break;
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case 'd': /* Not documented. */
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case 'v':
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verbose = 1;
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break;
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case 'f':
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force = 1;
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break;
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case 'N':
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kernel = optarg;
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break;
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case 'z':
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compress = 1;
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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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if (!clear) {
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if (argc != 1 && argc != 2)
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usage();
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dirname = argv[0];
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}
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if (argc == 2)
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kernel = argv[1];
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(void)time(&now);
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kmem_setup();
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if (clear) {
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clear_dump();
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exit(0);
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}
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if (!dump_exists() && !force)
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exit(1);
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check_kmem();
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if (panicstr)
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syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg);
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else
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syslog(LOG_ALERT, "reboot");
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if ((!get_crashtime() || !check_space()) && !force)
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exit(1);
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save_core();
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clear_dump();
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exit(0);
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}
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void
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kmem_setup()
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{
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kvm_t *kd_kern;
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char errbuf[_POSIX2_LINE_MAX];
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int i, hdrsz;
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char *dump_sys;
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/*
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* Some names we need for the currently running system, others for
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* the system that was running when the dump was made. The values
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* obtained from the current system are used to look for things in
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* /dev/kmem that cannot be found in the dump_sys namelist, but are
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* presumed to be the same (since the disk partitions are probably
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* the same!)
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*/
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kd_kern = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
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if (kd_kern == NULL) {
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syslog(LOG_ERR, "%s: kvm_openfiles: %s", _PATH_UNIX, errbuf);
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exit(1);
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}
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if (kvm_nlist(kd_kern, current_nl) == -1)
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syslog(LOG_ERR, "%s: kvm_nlist: %s", _PATH_UNIX,
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kvm_geterr(kd_kern));
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for (i = 0; cursyms[i] != -1; i++)
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if (current_nl[cursyms[i]].n_value == 0) {
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syslog(LOG_ERR, "%s: %s not in namelist",
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_PATH_UNIX, current_nl[cursyms[i]].n_name);
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exit(1);
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}
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if (KREAD(kd_kern, current_nl[X_DUMPDEV].n_value, &dumpdev) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern));
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exit(1);
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}
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if (dumpdev == NODEV) {
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syslog(LOG_WARNING, "no core dump (no dumpdev)");
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exit(1);
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}
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if (KREAD(kd_kern, current_nl[X_DUMPLO].n_value, &dumplo) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern));
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exit(1);
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}
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dumplo *= DEV_BSIZE;
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if (verbose)
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(void)printf("dumplo = %ld (%ld * %ld)\n",
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(long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE);
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if (KREAD(kd_kern, current_nl[X_DUMPMAG].n_value, &dumpmag) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_kern));
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exit(1);
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}
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if (kernel == NULL) {
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(void)kvm_read(kd_kern, current_nl[X_VERSION].n_value,
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vers, sizeof(vers));
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vers[sizeof(vers) - 1] = '\0';
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}
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ddname = find_dev(dumpdev, S_IFBLK);
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dumpfd = Open(ddname, O_RDWR);
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dump_sys = kernel ? kernel : _PATH_UNIX;
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kd_dump = kvm_openfiles(dump_sys, ddname, NULL, O_RDWR, errbuf);
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if (kd_dump == NULL) {
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syslog(LOG_ERR, "%s: kvm_openfiles: %s", dump_sys, errbuf);
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exit(1);
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}
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if (kvm_nlist(kd_dump, dump_nl) == -1)
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syslog(LOG_ERR, "%s: kvm_nlist: %s", dump_sys,
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kvm_geterr(kd_dump));
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for (i = 0; dumpsyms[i] != -1; i++)
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if (dump_nl[dumpsyms[i]].n_value == 0) {
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syslog(LOG_ERR, "%s: %s not in namelist",
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dump_sys, dump_nl[dumpsyms[i]].n_name);
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exit(1);
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}
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hdrsz = kvm_dump_mkheader(kd_dump, (off_t)dumplo);
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/*
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* If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number
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* checks, ergo no dump is present...
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*/
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if (hdrsz == 0) {
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syslog(LOG_WARNING, "no core dump");
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exit(1);
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}
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if (hdrsz == -1) {
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syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", dump_sys,
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kvm_geterr(kd_dump));
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exit(1);
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}
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dumplo += hdrsz;
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kvm_close(kd_kern);
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}
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void
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check_kmem()
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{
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char *cp;
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long panicloc;
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char core_vers[1024];
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(void)kvm_read(kd_dump, dump_nl[X_VERSION].n_value, core_vers,
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sizeof(core_vers));
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core_vers[sizeof(core_vers) - 1] = '\0';
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if (strcmp(vers, core_vers) && kernel == 0)
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syslog(LOG_WARNING,
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"warning: %s version mismatch:\n\t%s\nand\t%s\n",
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_PATH_UNIX, vers, core_vers);
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if (KREAD(kd_dump, dump_nl[X_PANICSTR].n_value, &panicstr) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump));
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return;
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}
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if (panicstr) {
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cp = panic_mesg;
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panicloc = panicstr;
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do {
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if (KREAD(kd_dump, panicloc, cp) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s",
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kvm_geterr(kd_dump));
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break;
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}
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panicloc++;
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} while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]);
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panic_mesg[sizeof(panic_mesg) - 1] = '\0';
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}
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}
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int
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dump_exists()
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{
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int newdumpmag;
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if (KREAD(kd_dump, dump_nl[X_DUMPMAG].n_value, &newdumpmag) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump));
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return (0);
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}
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/* Read the dump size. */
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if (KREAD(kd_dump, dump_nl[X_DUMPSIZE].n_value, &dumpsize) != 0) {
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if (verbose)
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syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump));
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return (0);
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}
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dumpsize *= getpagesize();
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/*
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* Return zero if core dump doesn't seem to be there, and note
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* it for syslog. This check and return happens after the dump size
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* is read, so dumpsize is whether or not the core is valid (for -f).
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*/
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if (newdumpmag != dumpmag) {
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if (verbose)
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syslog(LOG_WARNING,
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"magic number mismatch (0x%x != 0x%x)",
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newdumpmag, dumpmag);
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syslog(LOG_WARNING, "no core dump");
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return (0);
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}
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return (1);
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}
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void
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clear_dump()
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{
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if (kvm_dump_inval(kd_dump) == -1)
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syslog(LOG_ERR, "%s: kvm_clear_dump: %s", ddname,
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kvm_geterr(kd_dump));
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}
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char buf[1024 * 1024];
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void
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save_core()
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{
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FILE *fp;
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int bounds, ifd, nr, nw, ofd;
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char *rawp, path[MAXPATHLEN];
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ofd = -1;
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/*
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* Get the current number and update the bounds file. Do the update
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* now, because may fail later and don't want to overwrite anything.
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*/
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umask(002);
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(void)snprintf(path, sizeof(path), "%s/bounds", dirname);
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if ((fp = fopen(path, "r")) == NULL)
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goto err1;
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if (fgets(buf, sizeof(buf), fp) == NULL) {
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if (ferror(fp))
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err1: syslog(LOG_WARNING, "%s: %s", path, strerror(errno));
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bounds = 0;
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} else
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bounds = atoi(buf);
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if (fp != NULL)
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(void)fclose(fp);
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if ((fp = fopen(path, "w")) == NULL)
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syslog(LOG_ERR, "%s: %m", path);
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else {
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(void)fprintf(fp, "%d\n", bounds + 1);
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(void)fclose(fp);
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}
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(void)fclose(fp);
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/* Create the core file. */
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(void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s",
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dirname, bounds, compress ? ".Z" : "");
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if (compress) {
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if ((fp = zopen(path, "w", 0)) == NULL) {
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syslog(LOG_ERR, "%s: %s", path, strerror(errno));
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exit(1);
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}
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} else {
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ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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fp = fdopen(ofd, "w");
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if (fp == NULL) {
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syslog(LOG_ERR, "%s: fdopen: %s", path,
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strerror(errno));
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exit(1);
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}
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}
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/* Open the raw device. */
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rawp = rawname(ddname);
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if ((ifd = open(rawp, O_RDONLY)) == -1) {
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syslog(LOG_WARNING, "%s: %m; using block device", rawp);
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ifd = dumpfd;
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}
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/* Seek to the start of the core. */
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Lseek(ifd, (off_t)dumplo, SEEK_SET);
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if (kvm_dump_wrtheader(kd_dump, fp, dumpsize) == -1) {
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syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path,
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kvm_geterr(kd_dump));
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exit(1);
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}
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/* Copy the core file. */
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syslog(LOG_NOTICE, "writing %score to %s",
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compress ? "compressed " : "", path);
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for (; dumpsize > 0; dumpsize -= nr) {
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(void)printf("%6dK\r", dumpsize / 1024);
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(void)fflush(stdout);
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nr = read(ifd, buf, MIN(dumpsize, sizeof(buf)));
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if (nr <= 0) {
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if (nr == 0)
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syslog(LOG_WARNING,
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"WARNING: EOF on dump device");
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else
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syslog(LOG_ERR, "%s: %m", rawp);
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goto err2;
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}
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nw = fwrite(buf, 1, nr, fp);
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if (nw != nr) {
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syslog(LOG_ERR, "%s: %s",
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path, strerror(nw == 0 ? EIO : errno));
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err2: syslog(LOG_WARNING,
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"WARNING: core may be incomplete");
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(void)printf("\n");
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exit(1);
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}
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}
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(void)close(ifd);
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(void)fclose(fp);
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/* Copy the kernel. */
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ifd = Open(kernel ? kernel : _PATH_UNIX, O_RDONLY);
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(void)snprintf(path, sizeof(path), "%s/netbsd.%d%s",
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dirname, bounds, compress ? ".Z" : "");
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if (compress) {
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if ((fp = zopen(path, "w", 0)) == NULL) {
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syslog(LOG_ERR, "%s: %s", path, strerror(errno));
|
|
exit(1);
|
|
}
|
|
} else
|
|
ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
|
|
syslog(LOG_NOTICE, "writing %skernel to %s",
|
|
compress ? "compressed " : "", path);
|
|
while ((nr = read(ifd, buf, sizeof(buf))) > 0) {
|
|
if (compress)
|
|
nw = fwrite(buf, 1, nr, fp);
|
|
else
|
|
nw = write(ofd, buf, nr);
|
|
if (nw != nr) {
|
|
syslog(LOG_ERR, "%s: %s",
|
|
path, strerror(nw == 0 ? EIO : errno));
|
|
syslog(LOG_WARNING,
|
|
"WARNING: kernel may be incomplete");
|
|
exit(1);
|
|
}
|
|
}
|
|
if (nr < 0) {
|
|
syslog(LOG_ERR, "%s: %s",
|
|
kernel ? kernel : _PATH_UNIX, strerror(errno));
|
|
syslog(LOG_WARNING,
|
|
"WARNING: kernel may be incomplete");
|
|
exit(1);
|
|
}
|
|
if (compress)
|
|
(void)fclose(fp);
|
|
else
|
|
(void)close(ofd);
|
|
}
|
|
|
|
char *
|
|
find_dev(dev, type)
|
|
dev_t dev;
|
|
int type;
|
|
{
|
|
DIR *dfd;
|
|
struct dirent *dir;
|
|
struct stat sb;
|
|
char *dp, devname[MAXPATHLEN + 1];
|
|
|
|
if ((dfd = opendir(_PATH_DEV)) == NULL) {
|
|
syslog(LOG_ERR, "%s: %s", _PATH_DEV, strerror(errno));
|
|
exit(1);
|
|
}
|
|
(void)strcpy(devname, _PATH_DEV);
|
|
while ((dir = readdir(dfd))) {
|
|
(void)strcpy(devname + sizeof(_PATH_DEV) - 1, dir->d_name);
|
|
if (lstat(devname, &sb)) {
|
|
syslog(LOG_ERR, "%s: %s", devname, strerror(errno));
|
|
continue;
|
|
}
|
|
if ((sb.st_mode & S_IFMT) != type)
|
|
continue;
|
|
if (dev == sb.st_rdev) {
|
|
closedir(dfd);
|
|
if ((dp = strdup(devname)) == NULL) {
|
|
syslog(LOG_ERR, "%s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
return (dp);
|
|
}
|
|
}
|
|
closedir(dfd);
|
|
syslog(LOG_ERR, "can't find device %d/%d", major(dev), minor(dev));
|
|
exit(1);
|
|
}
|
|
|
|
char *
|
|
rawname(s)
|
|
char *s;
|
|
{
|
|
char *sl, name[MAXPATHLEN];
|
|
|
|
if ((sl = strrchr(s, '/')) == NULL || sl[1] == '0') {
|
|
syslog(LOG_ERR,
|
|
"can't make raw dump device name from %s", s);
|
|
return (s);
|
|
}
|
|
(void)snprintf(name, sizeof(name), "%.*s/r%s", (int)(sl - s), s,
|
|
sl + 1);
|
|
if ((sl = strdup(name)) == NULL) {
|
|
syslog(LOG_ERR, "%s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
return (sl);
|
|
}
|
|
|
|
int
|
|
get_crashtime()
|
|
{
|
|
time_t dumptime; /* Time the dump was taken. */
|
|
|
|
if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dumptime) != 0) {
|
|
if (verbose)
|
|
syslog(LOG_WARNING, "kvm_read: %s", kvm_geterr(kd_dump));
|
|
return (0);
|
|
}
|
|
if (dumptime == 0) {
|
|
if (verbose)
|
|
syslog(LOG_ERR, "dump time is zero");
|
|
return (0);
|
|
}
|
|
(void)printf("savecore: system went down at %s", ctime(&dumptime));
|
|
#define LEEWAY (7 * SECSPERDAY)
|
|
if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) {
|
|
(void)printf("dump time is unreasonable\n");
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
check_space()
|
|
{
|
|
FILE *fp;
|
|
char *tkernel;
|
|
off_t minfree, spacefree, kernelsize, needed;
|
|
struct stat st;
|
|
struct statfs fsbuf;
|
|
char buf[100], path[MAXPATHLEN];
|
|
|
|
#ifdef __GNUC__
|
|
(void) &minfree;
|
|
#endif
|
|
|
|
tkernel = kernel ? kernel : _PATH_UNIX;
|
|
if (stat(tkernel, &st) < 0) {
|
|
syslog(LOG_ERR, "%s: %m", tkernel);
|
|
exit(1);
|
|
}
|
|
kernelsize = st.st_blocks * S_BLKSIZE;
|
|
if (statfs(dirname, &fsbuf) < 0) {
|
|
syslog(LOG_ERR, "%s: %m", dirname);
|
|
exit(1);
|
|
}
|
|
spacefree = (fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
|
|
|
|
(void)snprintf(path, sizeof(path), "%s/minfree", dirname);
|
|
if ((fp = fopen(path, "r")) == NULL)
|
|
minfree = 0;
|
|
else {
|
|
if (fgets(buf, sizeof(buf), fp) == NULL)
|
|
minfree = 0;
|
|
else
|
|
minfree = atoi(buf);
|
|
(void)fclose(fp);
|
|
}
|
|
|
|
needed = (dumpsize + kernelsize) / 1024;
|
|
if (minfree > 0 && spacefree - needed < minfree) {
|
|
syslog(LOG_WARNING,
|
|
"no dump, not enough free space on device");
|
|
return (0);
|
|
}
|
|
if (spacefree - needed < minfree)
|
|
syslog(LOG_WARNING,
|
|
"dump performed, but free space threshold crossed");
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
Open(name, rw)
|
|
char *name;
|
|
int rw;
|
|
{
|
|
int fd;
|
|
|
|
if ((fd = open(name, rw, 0)) < 0) {
|
|
syslog(LOG_ERR, "%s: %m", name);
|
|
exit(1);
|
|
}
|
|
return (fd);
|
|
}
|
|
|
|
void
|
|
Lseek(fd, off, flag)
|
|
int fd, flag;
|
|
off_t off;
|
|
{
|
|
off_t ret;
|
|
|
|
ret = lseek(fd, off, flag);
|
|
if (ret == -1) {
|
|
syslog(LOG_ERR, "lseek: %m");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
int
|
|
Create(file, mode)
|
|
char *file;
|
|
int mode;
|
|
{
|
|
int fd;
|
|
|
|
fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, mode);
|
|
if (fd < 0) {
|
|
syslog(LOG_ERR, "%s: %m", file);
|
|
exit(1);
|
|
}
|
|
return (fd);
|
|
}
|
|
|
|
void
|
|
Write(fd, bp, size)
|
|
int fd, size;
|
|
void *bp;
|
|
{
|
|
int n;
|
|
|
|
if ((n = write(fd, bp, size)) < size) {
|
|
syslog(LOG_ERR, "write: %s", strerror(n == -1 ? errno : EIO));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
(void)syslog(LOG_ERR, "usage: savecore [-cfvz] [-N system] directory");
|
|
exit(1);
|
|
}
|