613 lines
15 KiB
C
613 lines
15 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* 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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/disk.h>
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#include <sys/kerneldump.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fstab.h>
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#include <paths.h>
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#include <stdarg.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 <syslog.h>
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#include <time.h>
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#include <unistd.h>
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/* The size of the buffer used for I/O. */
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#define BUFFERSIZE (1024*1024)
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#define STATUS_BAD 0
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#define STATUS_GOOD 1
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#define STATUS_UNKNOWN 2
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static int checkfor, compress, clear, force, keep, verbose; /* flags */
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static int nfound, nsaved, nerr; /* statistics */
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extern FILE *zopen(const char *, const char *);
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static void
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printheader(FILE *f, const struct kerneldumpheader *h, const char *device,
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int bounds, const int status)
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{
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uint64_t dumplen;
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time_t t;
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const char *stat_str;
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fprintf(f, "Dump header from device %s\n", device);
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fprintf(f, " Architecture: %s\n", h->architecture);
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fprintf(f, " Architecture Version: %u\n", h->architectureversion);
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dumplen = dtoh64(h->dumplength);
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fprintf(f, " Dump Length: %lldB (%lld MB)\n", (long long)dumplen,
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(long long)(dumplen >> 20));
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fprintf(f, " Blocksize: %d\n", dtoh32(h->blocksize));
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t = dtoh64(h->dumptime);
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fprintf(f, " Dumptime: %s", ctime(&t));
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fprintf(f, " Hostname: %s\n", h->hostname);
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fprintf(f, " Magic: %s\n", h->magic);
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fprintf(f, " Version String: %s", h->versionstring);
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fprintf(f, " Panic String: %s\n", h->panicstring);
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fprintf(f, " Dump Parity: %u\n", h->parity);
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fprintf(f, " Bounds: %d\n", bounds);
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switch(status) {
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case STATUS_BAD:
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stat_str = "bad";
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break;
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case STATUS_GOOD:
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stat_str = "good";
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break;
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default:
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stat_str = "unknown";
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}
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fprintf(f, " Dump Status: %s\n", stat_str);
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fflush(f);
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}
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static int
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getbounds(void) {
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FILE *fp;
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char buf[6];
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int ret;
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ret = 0;
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if ((fp = fopen("bounds", "r")) == NULL) {
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syslog(LOG_WARNING, "unable to open bounds file, using 0");
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goto newfile;
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}
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if (fgets(buf, sizeof buf, fp) == NULL) {
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syslog(LOG_WARNING, "unable to read from bounds, using 0");
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fclose(fp);
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goto newfile;
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}
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errno = 0;
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ret = (int)strtol(buf, NULL, 10);
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if (ret == 0 && (errno == EINVAL || errno == ERANGE))
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syslog(LOG_WARNING, "invalid value found in bounds, using 0");
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newfile:
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if ((fp = fopen("bounds", "w")) == NULL) {
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syslog(LOG_WARNING, "unable to write to bounds file: %m");
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goto done;
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}
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if (verbose)
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printf("bounds number: %d\n", ret);
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fprintf(fp, "%d\n", (ret + 1));
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fclose(fp);
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done:
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return (ret);
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}
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/*
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* Check that sufficient space is available on the disk that holds the
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* save directory.
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*/
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static int
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check_space(char *savedir, off_t dumpsize)
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{
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FILE *fp;
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off_t minfree, spacefree, totfree, needed;
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struct statfs fsbuf;
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char buf[100], path[MAXPATHLEN];
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if (statfs(savedir, &fsbuf) < 0) {
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syslog(LOG_ERR, "%s: %m", savedir);
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exit(1);
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}
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spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
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totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
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(void)snprintf(path, sizeof(path), "%s/minfree", savedir);
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if ((fp = fopen(path, "r")) == NULL)
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minfree = 0;
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else {
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if (fgets(buf, sizeof(buf), fp) == NULL)
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minfree = 0;
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else
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minfree = atoi(buf);
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(void)fclose(fp);
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}
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needed = dumpsize / 1024 + 2; /* 2 for info file */
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if (((minfree > 0) ? spacefree : totfree) - needed < minfree) {
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syslog(LOG_WARNING,
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"no dump, not enough free space on device (%lld available, need %lld)",
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(long long)(minfree > 0 ? spacefree : totfree),
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(long long)needed);
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return (0);
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}
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if (spacefree - needed < 0)
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syslog(LOG_WARNING,
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"dump performed, but free space threshold crossed");
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return (1);
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}
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#define BLOCKSIZE (1<<12)
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#define BLOCKMASK (~(BLOCKSIZE-1))
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static void
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DoFile(char *savedir, const char *device)
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{
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static char *buf = NULL;
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struct kerneldumpheader kdhf, kdhl;
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off_t mediasize, dumpsize, firsthd, lasthd, dmpcnt;
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FILE *info, *fp;
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int fd, fdinfo, error, wl;
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int nr, nw, hs, he = 0;
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int bounds, status;
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u_int sectorsize;
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mode_t oumask;
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bounds = getbounds();
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dmpcnt = 0;
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mediasize = 0;
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status = STATUS_UNKNOWN;
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if (buf == NULL) {
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buf = malloc(BUFFERSIZE);
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if (buf == NULL) {
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syslog(LOG_ERR, "%m");
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return;
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}
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}
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if (verbose)
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printf("checking for kernel dump on device %s\n", device);
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fd = open(device, O_RDWR);
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if (fd < 0) {
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syslog(LOG_ERR, "%s: %m", device);
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return;
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}
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error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
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if (!error)
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error = ioctl(fd, DIOCGSECTORSIZE, §orsize);
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if (error) {
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syslog(LOG_ERR,
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"couldn't find media and/or sector size of %s: %m", device);
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goto closefd;
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}
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if (verbose) {
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printf("mediasize = %lld\n", (long long)mediasize);
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printf("sectorsize = %u\n", sectorsize);
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}
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lasthd = mediasize - sectorsize;
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lseek(fd, lasthd, SEEK_SET);
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error = read(fd, &kdhl, sizeof kdhl);
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if (error != sizeof kdhl) {
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syslog(LOG_ERR,
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"error reading last dump header at offset %lld in %s: %m",
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(long long)lasthd, device);
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goto closefd;
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}
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if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic)) {
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if (verbose)
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printf("magic mismatch on last dump header on %s\n",
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device);
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status = STATUS_BAD;
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if (force == 0)
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goto closefd;
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if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
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sizeof kdhl.magic) == 0) {
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if (verbose)
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printf("forcing magic on %s\n", device);
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memcpy(kdhl.magic, KERNELDUMPMAGIC,
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sizeof kdhl.magic);
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} else {
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syslog(LOG_ERR, "unable to force dump - bad magic");
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goto closefd;
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}
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}
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if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
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syslog(LOG_ERR,
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"unknown version (%d) in last dump header on %s",
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dtoh32(kdhl.version), device);
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status = STATUS_BAD;
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if (force == 0)
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goto closefd;
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}
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nfound++;
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if (clear)
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goto nuke;
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if (kerneldump_parity(&kdhl)) {
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syslog(LOG_ERR,
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"parity error on last dump header on %s", device);
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nerr++;
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status = STATUS_BAD;
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if (force == 0)
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goto closefd;
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}
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dumpsize = dtoh64(kdhl.dumplength);
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firsthd = lasthd - dumpsize - sizeof kdhf;
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lseek(fd, firsthd, SEEK_SET);
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error = read(fd, &kdhf, sizeof kdhf);
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if (error != sizeof kdhf) {
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syslog(LOG_ERR,
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"error reading first dump header at offset %lld in %s: %m",
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(long long)firsthd, device);
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nerr++;
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goto closefd;
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}
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if (verbose >= 2) {
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printf("First dump headers:\n");
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printheader(stdout, &kdhf, device, bounds, -1);
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printf("\nLast dump headers:\n");
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printheader(stdout, &kdhl, device, bounds, -1);
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printf("\n");
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}
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if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
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syslog(LOG_ERR,
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"first and last dump headers disagree on %s", device);
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nerr++;
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status = STATUS_BAD;
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if (force == 0)
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goto closefd;
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} else {
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status = STATUS_GOOD;
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}
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if (checkfor) {
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printf("A dump exists on %s\n", device);
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close(fd);
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exit(0);
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}
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if (kdhl.panicstring[0])
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syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
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else
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syslog(LOG_ALERT, "reboot");
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if (verbose)
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printf("Checking for available free space\n");
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if (!check_space(savedir, dumpsize)) {
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nerr++;
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goto closefd;
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}
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sprintf(buf, "info.%d", bounds);
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/*
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* Create or overwrite any existing dump header files.
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*/
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fdinfo = open(buf, O_WRONLY | O_CREAT | O_TRUNC, 0600);
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if (fdinfo < 0) {
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syslog(LOG_ERR, "%s: %m", buf);
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nerr++;
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goto closefd;
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}
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oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
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if (compress) {
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sprintf(buf, "vmcore.%d.gz", bounds);
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fp = zopen(buf, "w");
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} else {
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sprintf(buf, "vmcore.%d", bounds);
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fp = fopen(buf, "w");
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}
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if (fp == NULL) {
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syslog(LOG_ERR, "%s: %m", buf);
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close(fdinfo);
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nerr++;
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goto closefd;
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}
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(void)umask(oumask);
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info = fdopen(fdinfo, "w");
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if (verbose)
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printheader(stdout, &kdhl, device, bounds, status);
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printheader(info, &kdhl, device, bounds, status);
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fclose(info);
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syslog(LOG_NOTICE, "writing %score to %s",
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compress ? "compressed " : "", buf);
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while (dumpsize > 0) {
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wl = BUFFERSIZE;
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if (wl > dumpsize)
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wl = dumpsize;
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nr = read(fd, buf, wl);
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if (nr != wl) {
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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, "read error on %s: %m", device);
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nerr++;
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goto closeall;
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}
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if (compress) {
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nw = fwrite(buf, 1, wl, fp);
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} else {
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for (nw = 0; nw < nr; nw = he) {
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/* find a contiguous block of zeroes */
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for (hs = nw; hs < nr; hs += BLOCKSIZE) {
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for (he = hs; he < nr && buf[he] == 0; ++he)
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/* nothing */ ;
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/* is the hole long enough to matter? */
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if (he >= hs + BLOCKSIZE)
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break;
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}
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/* back down to a block boundary */
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he &= BLOCKMASK;
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/*
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* 1) Don't go beyond the end of the buffer.
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* 2) If the end of the buffer is less than
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* BLOCKSIZE bytes away, we're at the end
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* of the file, so just grab what's left.
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*/
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if (hs + BLOCKSIZE > nr)
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hs = he = nr;
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/*
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* At this point, we have a partial ordering:
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* nw <= hs <= he <= nr
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* If hs > nw, buf[nw..hs] contains non-zero data.
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* If he > hs, buf[hs..he] is all zeroes.
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*/
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if (hs > nw)
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if (fwrite(buf + nw, hs - nw, 1, fp) != 1)
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break;
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if (he > hs)
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if (fseeko(fp, he - hs, SEEK_CUR) == -1)
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break;
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}
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}
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if (nw != wl) {
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syslog(LOG_ERR,
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"write error on vmcore.%d file: %m", bounds);
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syslog(LOG_WARNING,
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"WARNING: vmcore may be incomplete");
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nerr++;
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goto closeall;
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}
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if (verbose) {
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dmpcnt += wl;
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printf("%llu\r", (unsigned long long)dmpcnt);
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fflush(stdout);
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}
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dumpsize -= wl;
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}
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if (verbose)
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printf("\n");
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if (fclose(fp) < 0) {
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syslog(LOG_ERR, "error on vmcore.%d: %m", bounds);
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nerr++;
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goto closeall;
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}
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nsaved++;
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if (verbose)
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printf("dump saved\n");
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nuke:
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if (clear || !keep) {
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if (verbose)
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printf("clearing dump header\n");
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memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
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lseek(fd, lasthd, SEEK_SET);
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error = write(fd, &kdhl, sizeof kdhl);
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if (error != sizeof kdhl)
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syslog(LOG_ERR,
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"error while clearing the dump header: %m");
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}
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close(fd);
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return;
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closeall:
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fclose(fp);
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closefd:
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close(fd);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "%s\n%s\n%s\n",
|
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"usage: savecore -c",
|
|
" savecore -C [-v] [directory device]",
|
|
" savecore [-fkvz] [directory [device ...]]");
|
|
exit (1);
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int i, ch, error;
|
|
struct fstab *fsp;
|
|
char *savedir;
|
|
|
|
checkfor = compress = clear = force = keep = verbose = 0;
|
|
nfound = nsaved = nerr = 0;
|
|
|
|
openlog("savecore", LOG_PERROR, LOG_DAEMON);
|
|
|
|
savedir = strdup(".");
|
|
if (savedir == NULL) {
|
|
syslog(LOG_ERR, "Cannot allocate memory");
|
|
exit(1);
|
|
}
|
|
while ((ch = getopt(argc, argv, "Ccfkvz")) != -1)
|
|
switch(ch) {
|
|
case 'C':
|
|
checkfor = 1;
|
|
break;
|
|
case 'c':
|
|
clear = 1;
|
|
break;
|
|
case 'k':
|
|
keep = 1;
|
|
break;
|
|
case 'v':
|
|
verbose++;
|
|
break;
|
|
case 'f':
|
|
force = 1;
|
|
break;
|
|
case 'z':
|
|
compress = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
if (checkfor && (clear || force || keep))
|
|
usage();
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc >= 1) {
|
|
error = chdir(argv[0]);
|
|
if (error) {
|
|
syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
|
|
exit(1);
|
|
}
|
|
savedir = argv[0];
|
|
argc--;
|
|
argv++;
|
|
}
|
|
if (argc == 0) {
|
|
for (;;) {
|
|
fsp = getfsent();
|
|
if (fsp == NULL)
|
|
break;
|
|
if (strcmp(fsp->fs_vfstype, "swap") &&
|
|
strcmp(fsp->fs_vfstype, "dump"))
|
|
continue;
|
|
DoFile(savedir, fsp->fs_spec);
|
|
}
|
|
} else {
|
|
for (i = 0; i < argc; i++)
|
|
DoFile(savedir, argv[i]);
|
|
}
|
|
|
|
/* Emit minimal output. */
|
|
if (nfound == 0) {
|
|
if (checkfor) {
|
|
printf("No dump exists\n");
|
|
exit(1);
|
|
}
|
|
syslog(LOG_WARNING, "no dumps found");
|
|
}
|
|
else if (nsaved == 0) {
|
|
if (nerr != 0)
|
|
syslog(LOG_WARNING, "unsaved dumps found but not saved");
|
|
else
|
|
syslog(LOG_WARNING, "no unsaved dumps found");
|
|
}
|
|
|
|
return (0);
|
|
}
|