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NetBSD/sbin/savecore/savecore.c

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/* $NetBSD: savecore.c,v 1.90 2020/04/03 19:09:43 maxv Exp $ */
/*-
* Copyright (c) 1986, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1986, 1992, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)savecore.c 8.5 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: savecore.c,v 1.90 2020/04/03 19:09:43 maxv Exp $");
#endif
#endif /* not lint */
#define _KSYMS_PRIVATE
#include <stdbool.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/msgbuf.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <sys/ksyms.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <nlist.h>
#include <paths.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <util.h>
#include <limits.h>
#include <stdarg.h>
#include <kvm.h>
extern FILE *zopen(const char *fname, const char *mode);
/*
* Note that KREAD_LOGWARN and KREAD_ERR take a variable name, not
* pointer to it, unlike KREAD() itself.
*/
#define KREAD(kd, addr, p)\
(kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p)))
#define KREAD_ERR(kd, addr, p, err) \
do { \
if (KREAD(kd, addr, &(p)) != 0) { \
err; \
} \
} while (0)
#define KREAD_LOGWARN(kd, addr, p, err) \
do { \
if (KREAD(kd, addr, &(p)) != 0) { \
syslog(LOG_WARNING, "%s:%d: kvm_read " #p ": %s", \
__func__, __LINE__, kvm_geterr(kd)); \
err; \
} \
} while (0)
static struct nlist current_nl[] = { /* Namelist for currently running system. */
#define X_DUMPDEV 0
{ .n_name = "_dumpdev" },
#define X_DUMPLO 1
{ .n_name = "_dumplo" },
#define X_TIME_SECOND 2
{ .n_name = "_time_second" },
#define X_TIME 3
{ .n_name = "_time" },
#define X_DUMPSIZE 4
{ .n_name = "_dumpsize" },
#define X_VERSION 5
{ .n_name = "_version" },
#define X_DUMPMAG 6
{ .n_name = "_dumpmag" },
#define X_PANICSTR 7
{ .n_name = "_panicstr" },
#define X_PANICSTART 8
{ .n_name = "_panicstart" },
#define X_PANICEND 9
{ .n_name = "_panicend" },
#define X_MSGBUF 10
{ .n_name = "_msgbufp" },
#define X_DUMPCDEV 11
{ .n_name = "_dumpcdev" },
#define X_SYMSZ 12
{ .n_name = "_ksyms_symsz" },
#define X_STRSZ 13
{ .n_name = "_ksyms_strsz" },
#define X_KHDR 14
{ .n_name = "_ksyms_hdr" },
#define X_SYMTABS 15
{ .n_name = "_ksyms_symtabs" },
{ .n_name = NULL },
};
static int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, X_DUMPCDEV, -1 };
static int dumpsyms[] = { X_TIME_SECOND, X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR,
X_DUMPMAG, X_SYMSZ, X_STRSZ, X_KHDR, X_SYMTABS, -1 };
static struct nlist dump_nl[] = { /* Name list for dumped system. */
{ .n_name = "_dumpdev" }, /* Entries MUST be the same as */
{ .n_name = "_dumplo" }, /* those in current_nl[]. */
{ .n_name = "_time_second" },
{ .n_name = "_time" },
{ .n_name = "_dumpsize" },
{ .n_name = "_version" },
{ .n_name = "_dumpmag" },
{ .n_name = "_panicstr" },
{ .n_name = "_panicstart" },
{ .n_name = "_panicend" },
{ .n_name = "_msgbufp" },
{ .n_name = "_dumpcdev" },
{ .n_name = "_ksyms_symsz" },
{ .n_name = "_ksyms_strsz" },
{ .n_name = "_ksyms_hdr" },
{ .n_name = "_ksyms_symtabs" },
{ .n_name = NULL },
};
/* Types match kernel declarations. */
static off_t dumplo; /* where dump starts on dumpdev */
static u_int32_t dumpmag; /* magic number in dump */
static int dumpsize; /* amount of memory dumped */
static off_t dumpbytes; /* in bytes */
static const char *kernel; /* name of used kernel */
static const char *dirname; /* directory to save dumps in */
static char *ddname; /* name of dump device */
static dev_t dumpdev; /* dump device */
static dev_t dumpcdev = NODEV; /* dump device (char equivalent) */
static int dumpfd; /* read/write descriptor on dev */
static kvm_t *kd_dump; /* kvm descriptor on dev */
static time_t now; /* current date */
static char panic_mesg[1024];
static long panicstr;
static char vers[1024];
static char gzmode[3];
static void check_kmem(void);
static int check_space(void);
static void clear_dump(void);
static int Create(char *, int);
static int dump_exists(int);
static char *find_dev(dev_t, mode_t);
static int get_crashtime(void);
static void kmem_setup(int);
static void Lseek(int, off_t, int);
static int Open(const char *, int rw);
static void save_core(int);
__dead static void usage(const char *fmt, ...) __printflike(1, 2);
int
main(int argc, char *argv[])
{
int ch, level, testonly, compress, force, clear, verbose;
char *ep;
kernel = NULL;
level = 1; /* default to fastest gzip compression */
force = 0;
clear = 0;
testonly = 0;
verbose = 0;
compress = 0;
gzmode[0] = 'w';
openlog("savecore", LOG_PERROR, LOG_DAEMON);
while ((ch = getopt(argc, argv, "cdfnN:vzZ:")) != -1)
switch(ch) {
case 'c':
clear = 1;
break;
case 'd': /* Not documented. */
case 'v':
verbose = 1;
break;
case 'f':
force = 1;
break;
case 'n':
testonly = 1;
break;
case 'N':
kernel = optarg;
break;
case 'z':
compress = 1;
break;
case 'Z':
level = (int)strtol(optarg, &ep, 10);
if (level < 0 || level > 9)
usage("Invalid compression `%s'", optarg);
break;
case '?':
usage("Missing argument for flag `%c'", optopt);
default:
usage("Unknown flag `%c'", ch);
}
argc -= optind;
argv += optind;
if (argc != 0)
dirname = argv[0];
else
dirname = "/var/crash";
gzmode[1] = level + '0';
(void)time(&now);
kmem_setup(verbose);
if (clear && !testonly) {
clear_dump();
exit(0);
}
if (!dump_exists(verbose) && !force)
exit(1);
if (testonly)
/* If -n was passed and there was a dump, exit at level 0 */
exit(0);
check_kmem();
if (panicstr)
syslog(LOG_ALERT, "reboot after panic: %s", panic_mesg);
else
syslog(LOG_ALERT, "reboot");
if ((!get_crashtime() || !check_space()) && !force)
exit(1);
save_core(compress);
clear_dump();
exit(0);
}
static void
read_string(kvm_t *kd, u_long kva, char *buf, size_t size)
{
size_t i;
for (i = 0; i < size - 1; i++) {
(void)kvm_read(kd, kva + i, buf + i, 1);
if (buf[i] == '\0')
return;
}
buf[size - 1] = '\0';
}
static void
kmem_setup(int verbose)
{
long l_dumplo;
kvm_t *kd_kern;
char errbuf[_POSIX2_LINE_MAX];
int i, hdrsz;
/*
* Some names we need for the currently running system, others for
* the system that was running when the dump was made. The values
* obtained from the current system are used to look for things in
* /dev/kmem that cannot be found in the kernel namelist, but are
* presumed to be the same (since the disk partitions are probably
* the same!)
*/
kd_kern = kvm_openfiles(kernel, NULL, NULL, O_RDONLY, errbuf);
if (kd_kern == NULL) {
syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf);
exit(1);
}
if (kvm_nlist(kd_kern, current_nl) == -1)
syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel,
kvm_geterr(kd_kern));
for (i = 0; cursyms[i] != -1; i++) {
if (current_nl[cursyms[i]].n_value != 0)
continue;
switch (cursyms[i]) {
case X_TIME_SECOND:
case X_TIME:
case X_DUMPCDEV:
break;
default:
syslog(LOG_ERR, "%s: %s not in namelist",
kernel, current_nl[cursyms[i]].n_name);
exit(1);
}
}
KREAD_LOGWARN(kd_kern, current_nl[X_DUMPDEV].n_value, dumpdev, exit(1));
if (dumpdev == NODEV) {
syslog(LOG_WARNING, "no core dump (no dumpdev)");
exit(1);
}
KREAD_LOGWARN(kd_kern, current_nl[X_DUMPLO].n_value, l_dumplo, exit(1));
if (l_dumplo == -1) {
syslog(LOG_WARNING, "no core dump (invalid dumplo)");
exit(1);
}
dumplo = DEV_BSIZE * (off_t) l_dumplo;
if (verbose)
(void)printf("dumplo = %lld (%ld * %ld)\n",
(long long)dumplo, (long)(dumplo / DEV_BSIZE), (long)DEV_BSIZE);
KREAD_LOGWARN(kd_kern, current_nl[X_DUMPMAG].n_value, dumpmag, exit(1));
read_string(kd_kern, current_nl[X_VERSION].n_value, vers,
sizeof(vers));
if (current_nl[X_DUMPCDEV].n_value != 0) {
KREAD_LOGWARN(kd_kern, current_nl[X_DUMPCDEV].n_value, dumpcdev,
exit(1));
ddname = find_dev(dumpcdev, S_IFCHR);
} else
ddname = find_dev(dumpdev, S_IFBLK);
if (strncmp(ddname, "/dev/cons", 8) == 0 ||
strncmp(ddname, "/dev/tty", 7) == 0 ||
strncmp(ddname, "/dev/pty", 7) == 0 ||
strncmp(ddname, "/dev/pts", 7) == 0) {
syslog(LOG_ERR, "dumpdev %s is tty; override kernel", ddname);
exit(1);
}
dumpfd = Open(ddname, O_RDWR);
kd_dump = kvm_openfiles(kernel, ddname, NULL, O_RDWR, errbuf);
if (kd_dump == NULL) {
syslog(LOG_ERR, "%s: kvm_openfiles: %s", kernel, errbuf);
exit(1);
}
if (kvm_nlist(kd_dump, dump_nl) == -1)
syslog(LOG_ERR, "%s: kvm_nlist: %s", kernel,
kvm_geterr(kd_dump));
for (i = 0; dumpsyms[i] != -1; i++)
if (dump_nl[dumpsyms[i]].n_value == 0 &&
dumpsyms[i] != X_TIME_SECOND &&
dumpsyms[i] != X_TIME) {
syslog(LOG_ERR, "%s: %s not in namelist",
kernel, dump_nl[dumpsyms[i]].n_name);
exit(1);
}
hdrsz = kvm_dump_mkheader(kd_dump, dumplo);
/*
* If 'hdrsz' == 0, kvm_dump_mkheader() failed on the magic-number
* checks, ergo no dump is present...
*/
if (hdrsz == 0) {
syslog(LOG_WARNING, "no core dump");
exit(1);
}
if (hdrsz == -1) {
syslog(LOG_ERR, "%s: kvm_dump_mkheader: %s", kernel,
kvm_geterr(kd_dump));
exit(1);
}
dumplo += hdrsz;
kvm_close(kd_kern);
}
static void
check_kmem(void)
{
char *cp, *bufdata;
struct kern_msgbuf msgbuf, *bufp;
long panicloc, panicstart, panicend;
char core_vers[1024];
read_string(kd_dump, dump_nl[X_VERSION].n_value, core_vers,
sizeof(core_vers));
if (strcmp(vers, core_vers) != 0)
syslog(LOG_WARNING,
"warning: %s version mismatch:\n\t%s\nand\t%s\n",
kvm_getkernelname(kd_dump), vers, core_vers);
panicstart = panicend = 0;
KREAD_LOGWARN(kd_dump, dump_nl[X_PANICSTART].n_value, panicstart,
goto nomsguf);
KREAD_LOGWARN(kd_dump, dump_nl[X_PANICEND].n_value, panicend,
goto nomsguf);
if (panicstart != 0 && panicend != 0) {
KREAD_LOGWARN(kd_dump, dump_nl[X_MSGBUF].n_value, bufp,
goto nomsguf);
/* Reads msg_bufs[1], but doesn't matter. */
KREAD_LOGWARN(kd_dump, (long)bufp, msgbuf,
goto nomsguf);
if (msgbuf.msg_magic != MSG_MAGIC) {
syslog(LOG_WARNING, "msgbuf magic incorrect (%lx != %lx)",
msgbuf.msg_magic, (long)MSG_MAGIC);
goto nomsguf;
}
bufdata = malloc(msgbuf.msg_bufs);
if (bufdata == NULL) {
syslog(LOG_WARNING, "couldn't allocate space for msgbuf data");
goto nomsguf;
}
if (kvm_read(kd_dump, (long)&bufp->msg_bufc, bufdata,
msgbuf.msg_bufs) != msgbuf.msg_bufs) {
syslog(LOG_WARNING, "kvm_read dmesg buffer: %s",
kvm_geterr(kd_dump));
free(bufdata);
goto nomsguf;
}
cp = panic_mesg;
while (panicstart != panicend && cp < &panic_mesg[sizeof(panic_mesg)-1]) {
*cp++ = bufdata[panicstart];
panicstart++;
if (panicstart >= msgbuf.msg_bufs)
panicstart = 0;
}
/* Don't end in a new-line */
cp = &panic_mesg[strlen(panic_mesg)] - 1;
if (*cp == '\n')
*cp = '\0';
panic_mesg[sizeof(panic_mesg) - 1] = '\0';
free(bufdata);
panicstr = 1; /* anything not zero */
return;
}
nomsguf:
KREAD_LOGWARN(kd_dump, dump_nl[X_PANICSTR].n_value, panicstr,
return);
if (panicstr) {
cp = panic_mesg;
panicloc = panicstr;
do {
if (KREAD(kd_dump, panicloc, cp) != 0) {
syslog(LOG_WARNING, "kvm_read msgbuf: %s",
kvm_geterr(kd_dump));
break;
}
panicloc++;
} while (*cp++ && cp < &panic_mesg[sizeof(panic_mesg)-1]);
panic_mesg[sizeof(panic_mesg) - 1] = '\0';
}
}
static int
dump_exists(int verbose)
{
u_int32_t newdumpmag;
/* Read the dump magic and size. */
KREAD_ERR(kd_dump, dump_nl[X_DUMPMAG].n_value, newdumpmag, return 0);
KREAD_ERR(kd_dump, dump_nl[X_DUMPSIZE].n_value, dumpsize, return 0);
dumpbytes = (off_t)dumpsize * getpagesize();
/*
* Return zero if core dump doesn't seem to be there, and note
* it for syslog. This check and return happens after the dump size
* is read, so dumpsize is whether or not the core is valid (for -f).
*/
if (newdumpmag != dumpmag) {
if (verbose)
syslog(LOG_WARNING, "magic number mismatch "
"(%#x != %#x)", newdumpmag, dumpmag);
syslog(LOG_WARNING, "no core dump");
return (0);
}
return (1);
}
static void
clear_dump(void)
{
if (kvm_dump_inval(kd_dump) == -1)
syslog(LOG_ERR, "%s: kvm_dump_inval: %s", ddname,
kvm_geterr(kd_dump));
}
static char buf[1024 * 1024];
static void
save_kernel(FILE *fp, char *path)
{
int nw, nr, ifd;
ifd = Open(kernel, O_RDONLY);
while ((nr = read(ifd, buf, sizeof(buf))) > 0) {
nw = fwrite(buf, 1, nr, fp);
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: %m", kernel);
syslog(LOG_WARNING, "WARNING: kernel may be incomplete");
exit(1);
}
}
static int
ksymsget(u_long addr, void *ptr, size_t size)
{
if ((size_t)kvm_read(kd_dump, addr, ptr, size) != size) {
syslog(LOG_WARNING, "kvm_read ksyms: %s", kvm_geterr(kd_dump));
return 1;
}
return 0;
}
static int
save_ksyms(FILE *fp, char *path)
{
struct ksyms_hdr khdr;
int nw, symsz, strsz;
TAILQ_HEAD(, ksyms_symtab) symtabs;
struct ksyms_symtab st, *stptr;
void *p;
/* Get basic info and ELF headers, check if ksyms was on. */
if (ksymsget(dump_nl[X_KHDR].n_value, &khdr, sizeof(khdr)))
return 1;
if (ksymsget(dump_nl[X_SYMSZ].n_value, &symsz, sizeof(symsz)))
return 1;
if (ksymsget(dump_nl[X_STRSZ].n_value, &strsz, sizeof(strsz)))
return 1;
if (symsz == 0 || strsz == 0)
return 1;
/* Update the ELF section headers for symbols/strings. */
khdr.kh_shdr[SYMTAB].sh_size = symsz;
khdr.kh_shdr[SYMTAB].sh_info = symsz / sizeof(Elf_Sym);
khdr.kh_shdr[STRTAB].sh_offset = symsz +
khdr.kh_shdr[SYMTAB].sh_offset;
khdr.kh_shdr[STRTAB].sh_size = strsz;
/* Write out the ELF headers. */
nw = fwrite(&khdr, 1, sizeof(khdr), fp);
if (nw != sizeof(khdr)) {
syslog(LOG_ERR, "%s: %s",
path, strerror(nw == 0 ? EIO : errno));
syslog(LOG_WARNING,
"WARNING: kernel may be incomplete");
exit(1);
}
/* Dump symbol table. */
if (ksymsget(dump_nl[X_SYMTABS].n_value, &symtabs, sizeof(symtabs)))
return 1;
stptr = TAILQ_FIRST(&symtabs);
while (stptr != NULL) {
if (ksymsget((u_long)stptr, &st, sizeof(st)))
return 1;
stptr = TAILQ_NEXT(&st, sd_queue);
if ((p = malloc(st.sd_symsize)) == NULL)
return 1;
if (ksymsget((u_long)st.sd_symstart, p, st.sd_symsize)) {
free(p);
return 1;
}
nw = fwrite(p, 1, st.sd_symsize, fp);
free(p);
if (nw != st.sd_symsize) {
syslog(LOG_ERR, "%s: %s",
path, strerror(nw == 0 ? EIO : errno));
syslog(LOG_WARNING,
"WARNING: kernel may be incomplete");
exit(1);
}
}
/* Dump string table. */
if (ksymsget(dump_nl[X_SYMTABS].n_value, &symtabs, sizeof(symtabs)))
return 1;
stptr = TAILQ_FIRST(&symtabs);
while (stptr != NULL) {
if (ksymsget((u_long)stptr, &st, sizeof(st)))
return 1;
stptr = TAILQ_NEXT(&st, sd_queue);
if ((p = malloc(st.sd_symsize)) == NULL)
return 1;
if (ksymsget((u_long)st.sd_strstart, p, st.sd_strsize)) {
free(p);
return 1;
}
nw = fwrite(p, 1, st.sd_strsize, fp);
free(p);
if (nw != st.sd_strsize) {
syslog(LOG_ERR, "%s: %s",
path, strerror(nw == 0 ? EIO : errno));
syslog(LOG_WARNING,
"WARNING: kernel may be incomplete");
exit(1);
}
}
return 0;
}
static void
save_core(int compress)
{
FILE *fp;
int bounds, ifd, nr, nw, ofd, tryksyms;
char path[MAXPATHLEN], rbuf[MAXPATHLEN];
const char *rawp;
ofd = -1;
/*
* Get the current number and update the bounds file. Do the update
* now, because may fail later and don't want to overwrite anything.
*/
umask(066);
(void)snprintf(path, sizeof(path), "%s/bounds", dirname);
if ((fp = fopen(path, "r")) == NULL)
goto err1;
if (fgets(buf, sizeof(buf), fp) == NULL) {
if (ferror(fp))
err1: syslog(LOG_WARNING, "%s: %m", path);
bounds = 0;
} else
bounds = atoi(buf);
if (fp != NULL)
(void)fclose(fp);
if ((fp = fopen(path, "w")) == NULL)
syslog(LOG_ERR, "%s: %m", path);
else {
(void)fprintf(fp, "%d\n", bounds + 1);
(void)fclose(fp);
}
/* Create the core file. */
(void)snprintf(path, sizeof(path), "%s/netbsd.%d.core%s",
dirname, bounds, compress ? ".gz" : "");
if (compress) {
if ((fp = zopen(path, gzmode)) == NULL) {
syslog(LOG_ERR, "%s: %m", path);
exit(1);
}
} else {
ofd = Create(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
fp = fdopen(ofd, "w");
if (fp == NULL) {
syslog(LOG_ERR, "%s: fdopen: %m", path);
exit(1);
}
}
if (dumpcdev == NODEV) {
/* Open the raw device. */
rawp = getdiskrawname(rbuf, sizeof(rbuf), ddname);
if (rawp == NULL) {
syslog(LOG_WARNING, "%s: %m; can't convert to raw",
ddname);
rawp = ddname;
}
if ((ifd = open(rawp, O_RDONLY)) == -1) {
syslog(LOG_WARNING, "%s: %m; using block device",
rawp);
ifd = dumpfd;
}
} else {
rawp = ddname;
ifd = dumpfd;
}
/* Seek to the start of the core. */
Lseek(ifd, dumplo, SEEK_SET);
if (kvm_dump_wrtheader(kd_dump, fp, (int32_t)dumpbytes) == -1) {
syslog(LOG_ERR, "kvm_dump_wrtheader: %s : %s", path,
kvm_geterr(kd_dump));
exit(1);
}
/* Copy the core file. */
syslog(LOG_NOTICE, "writing %score to %s",
compress ? "compressed " : "", path);
for (; dumpbytes > (off_t)0; dumpbytes -= (off_t)nr) {
char nbuf[7];
humanize_number(nbuf, 7, dumpbytes, "", HN_AUTOSCALE, 0);
(void)printf("%7s\r", nbuf);
(void)fflush(stdout);
nr = read(ifd, buf, MIN(dumpbytes, (off_t)sizeof(buf)));
if (nr <= 0) {
if (nr == 0)
syslog(LOG_WARNING,
"WARNING: EOF on dump device");
else
syslog(LOG_ERR, "%s: %m", rawp);
goto err2;
}
nw = fwrite(buf, 1, nr, fp);
if (nw != nr) {
syslog(LOG_ERR, "%s: %s",
path, strerror(nw == 0 ? EIO : errno));
err2: syslog(LOG_WARNING,
"WARNING: core may be incomplete");
(void)printf("\n");
exit(1);
}
}
if (dumpcdev == NODEV)
(void)close(ifd);
(void)fclose(fp);
/* Create a kernel. */
(void)snprintf(path, sizeof(path), "%s/netbsd.%d%s",
dirname, bounds, compress ? ".gz" : "");
syslog(LOG_NOTICE, "writing %skernel to %s",
compress ? "compressed " : "", path);
for (tryksyms = 1;; tryksyms = 0) {
if (compress) {
if ((fp = zopen(path, gzmode)) == NULL) {
syslog(LOG_ERR, "%s: %m", path);
exit(1);
}
} else {
ofd = Create(path, S_IRUSR | S_IWUSR);
fp = fdopen(ofd, "w");
if (fp == NULL) {
syslog(LOG_ERR, "fdopen: %m");
exit(1);
}
}
if (tryksyms) {
if (!save_ksyms(fp, path))
break;
(void)fclose(fp);
unlink(path);
} else {
save_kernel(fp, path);
break;
}
}
(void)fclose(fp);
/*
* For development systems where the crash occurs during boot
* to multiuser.
*/
sync();
sleep(1);
sync();
sleep(1);
}
static char *
find_dev(dev_t dev, mode_t type)
{
DIR *dfd;
struct dirent *dir;
struct stat sb;
char *dp, device[MAXPATHLEN + 1], *p;
size_t l;
if ((dfd = opendir(_PATH_DEV)) == NULL) {
syslog(LOG_ERR, "%s: %m", _PATH_DEV);
exit(1);
}
strlcpy(device, _PATH_DEV, sizeof(device));
p = &device[strlen(device)];
l = sizeof(device) - strlen(device);
while ((dir = readdir(dfd))) {
strlcpy(p, dir->d_name, l);
if (lstat(device, &sb)) {
syslog(LOG_ERR, "%s: %m", device);
continue;
}
if ((sb.st_mode & S_IFMT) != type)
continue;
if (dev == sb.st_rdev) {
closedir(dfd);
if ((dp = strdup(device)) == NULL) {
syslog(LOG_ERR, "%m");
exit(1);
}
return (dp);
}
}
closedir(dfd);
syslog(LOG_ERR, "can't find device %lld/%lld",
(long long)major(dev), (long long)minor(dev));
exit(1);
}
static int
get_crashtime(void)
{
time_t dumptime; /* Time the dump was taken. */
struct timeval dtime;
if (KREAD(kd_dump, dump_nl[X_TIME_SECOND].n_value, &dumptime) != 0) {
if (KREAD(kd_dump, dump_nl[X_TIME].n_value, &dtime) != 0) {
syslog(LOG_WARNING, "kvm_read dumptime: %s (and _time_second "
"is not defined also)", kvm_geterr(kd_dump));
return (0);
}
dumptime = dtime.tv_sec;
}
if (dumptime == 0) {
syslog(LOG_WARNING, "dump time is zero");
return (0);
}
syslog(LOG_INFO, "system went down at %s", ctime(&dumptime));
#define LEEWAY (60 * SECSPERDAY)
if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) {
syslog(LOG_WARNING, "dump time is unreasonable");
return (0);
}
return (1);
}
static int
check_space(void)
{
FILE *fp;
off_t minfree, spacefree, kernelsize, needed;
struct stat st;
struct statvfs fsbuf;
char mbuf[100], path[MAXPATHLEN];
/* XXX assume a reasonable default, unless we find a kernel. */
kernelsize = 20 * 1024 * 1024;
if (!stat(kernel, &st)) kernelsize = st.st_blocks * S_BLKSIZE;
if (statvfs(dirname, &fsbuf) < 0) {
syslog(LOG_ERR, "%s: %m", dirname);
exit(1);
}
spacefree = fsbuf.f_bavail;
spacefree *= fsbuf.f_frsize;
spacefree /= 1024;
(void)snprintf(path, sizeof(path), "%s/minfree", dirname);
if ((fp = fopen(path, "r")) == NULL)
minfree = 0;
else {
if (fgets(mbuf, sizeof(mbuf), fp) == NULL)
minfree = 0;
else
minfree = atoi(mbuf);
(void)fclose(fp);
}
needed = (dumpbytes + kernelsize) / 1024;
if (minfree > 0 && spacefree - needed < minfree) {
syslog(LOG_WARNING,
"no dump, not enough free space in %s", dirname);
return (0);
}
if (spacefree - needed < minfree)
syslog(LOG_WARNING,
"dump performed, but free space threshold crossed");
return (1);
}
static int
Open(const char *name, int rw)
{
int fd;
if ((fd = open(name, rw, 0)) < 0) {
syslog(LOG_ERR, "%s: %m", name);
exit(1);
}
return (fd);
}
static void
Lseek(int fd, off_t off, int flag)
{
off_t ret;
ret = lseek(fd, off, flag);
if (ret == -1) {
syslog(LOG_ERR, "lseek: %m");
exit(1);
}
}
static int
Create(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);
}
static void
usage(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
(void)vsyslog(LOG_ERR, fmt, ap);
va_end(ap);
(void)syslog(LOG_ERR,
"Usage: %s [-cfnvz] [-N system] [-Z level] [directory]",
getprogname());
exit(1);
}
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