static void
printheader(FILE *f, const struct kerneldumpheader *h, const char *device,
int bounds, const int status)
{
uint64_t dumplen;
time_t t;
const char *stat_str;
fprintf(f, "Dump header from device %s\n", device);
fprintf(f, " Architecture: %s\n", h->architecture);
fprintf(f, " Architecture Version: %u\n",
dtoh32(h->architectureversion));
dumplen = dtoh64(h->dumplength);
fprintf(f, " Dump Length: %lldB (%lld MB)\n", (long long)dumplen,
(long long)(dumplen >> 20));
fprintf(f, " Blocksize: %d\n", dtoh32(h->blocksize));
t = dtoh64(h->dumptime);
fprintf(f, " Dumptime: %s", ctime(&t));
fprintf(f, " Hostname: %s\n", h->hostname);
fprintf(f, " Magic: %s\n", h->magic);
fprintf(f, " Version String: %s", h->versionstring);
fprintf(f, " Panic String: %s\n", h->panicstring);
fprintf(f, " Dump Parity: %u\n", h->parity);
fprintf(f, " Bounds: %d\n", bounds);
switch(status) {
case STATUS_BAD:
stat_str = "bad";
break;
case STATUS_GOOD:
stat_str = "good";
break;
default:
stat_str = "unknown";
}
fprintf(f, " Dump Status: %s\n", stat_str);
fflush(f);
}
static void
printheader(xo_handle_t *xo, const struct kerneldumpheader *h, const char *device,
int bounds, const int status)
{
uint64_t dumplen;
time_t t;
const char *stat_str;
xo_flush_h(xo);
xo_emit_h(xo, "{Lwc:Dump header from device}{:dump_device/%s}\n", device);
xo_emit_h(xo, "{P: }{Lwc:Architecture}{:architecture/%s}\n", h->architecture);
xo_emit_h(xo, "{P: }{Lwc:Architecture Version}{:architecture_version/%u}\n", dtoh32(h->architectureversion));
dumplen = dtoh64(h->dumplength);
xo_emit_h(xo, "{P: }{Lwc:Dump Length}{:dump_length_bytes/%lld}\n", (long long)dumplen);
xo_emit_h(xo, "{P: }{Lwc:Blocksize}{:blocksize/%d}\n", dtoh32(h->blocksize));
t = dtoh64(h->dumptime);
xo_emit_h(xo, "{P: }{Lwc:Dumptime}{:dumptime/%s}", ctime(&t));
xo_emit_h(xo, "{P: }{Lwc:Hostname}{:hostname/%s}\n", h->hostname);
xo_emit_h(xo, "{P: }{Lwc:Magic}{:magic/%s}\n", h->magic);
xo_emit_h(xo, "{P: }{Lwc:Version String}{:version_string/%s}", h->versionstring);
xo_emit_h(xo, "{P: }{Lwc:Panic String}{:panic_string/%s}\n", h->panicstring);
xo_emit_h(xo, "{P: }{Lwc:Dump Parity}{:dump_parity/%u}\n", h->parity);
xo_emit_h(xo, "{P: }{Lwc:Bounds}{:bounds/%d}\n", bounds);
switch(status) {
case STATUS_BAD:
stat_str = "bad";
break;
case STATUS_GOOD:
stat_str = "good";
break;
default:
stat_str = "unknown";
}
xo_emit_h(xo, "{P: }{Lwc:Dump Status}{:dump_status/%s}\n", stat_str);
xo_flush_h(xo);
}
static void
DoFile(const char *savedir, const char *device)
{
static char *buf = NULL;
struct partinfo dpart;
struct kerneldumpheader kdhf, kdhl;
off_t mediasize, dumpsize, firsthd, lasthd, dmpcnt;
FILE *info, *fp, *fpkern;
mode_t oumask;
int fd, fdinfo, fdkernin, error, wl;
int nr, nw, hs, he = 0;
int bounds, status;
u_int sectorsize;
bounds = getbounds();
dmpcnt = 0;
mediasize = 0;
status = STATUS_UNKNOWN;
if (buf == NULL) {
buf = malloc(BUFFERSIZE);
if (buf == NULL) {
syslog(LOG_ERR, "%m");
return;
}
}
if (verbose)
printf("checking for kernel dump on device %s\n", device);
fd = open(device, O_RDWR);
if (fd < 0) {
syslog(LOG_ERR, "%s: %m", device);
return;
}
bzero(&dpart, sizeof(dpart));
error = ioctl(fd, DIOCGPART, &dpart);
if (error) {
syslog(LOG_ERR,
"couldn't find media and/or sector size of %s: %m", device);
goto closefd;
}
mediasize = dpart.media_size;
sectorsize = dpart.media_blksize;
if (verbose) {
printf("mediasize = %lld\n", (long long)mediasize);
printf("sectorsize = %u\n", sectorsize);
}
lasthd = mediasize - sectorsize;
lseek(fd, lasthd, SEEK_SET);
error = read(fd, &kdhl, sizeof kdhl);
if (error != sizeof kdhl) {
syslog(LOG_ERR,
"error reading last dump header at offset %lld in %s: %m",
(long long)lasthd, device);
goto closefd;
}
if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic)) {
if (verbose)
printf("magic mismatch on last dump header on %s\n",
device);
status = STATUS_BAD;
if (force == 0)
goto closefd;
if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
sizeof kdhl.magic) == 0) {
if (verbose)
printf("forcing magic on %s\n", device);
memcpy(kdhl.magic, KERNELDUMPMAGIC,
sizeof kdhl.magic);
} else {
syslog(LOG_ERR, "unable to force dump - bad magic");
goto closefd;
}
}
if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
syslog(LOG_ERR,
"unknown version (%d) in last dump header on %s",
dtoh32(kdhl.version), device);
status = STATUS_BAD;
if (force == 0)
goto closefd;
}
nfound++;
if (clear)
goto nuke;
if (kerneldump_parity(&kdhl)) {
syslog(LOG_ERR,
"parity error on last dump header on %s", device);
nerr++;
status = STATUS_BAD;
if (force == 0)
goto closefd;
}
dumpsize = dtoh64(kdhl.dumplength);
firsthd = lasthd - dumpsize - sizeof kdhf;
lseek(fd, firsthd, SEEK_SET);
error = read(fd, &kdhf, sizeof kdhf);
if (error != sizeof kdhf) {
syslog(LOG_ERR,
"error reading first dump header at offset %lld in %s: %m",
(long long)firsthd, device);
nerr++;
goto closefd;
}
if (verbose >= 2) {
printf("First dump headers:\n");
printheader(stdout, &kdhf, device, bounds, -1);
printf("\nLast dump headers:\n");
printheader(stdout, &kdhl, device, bounds, -1);
printf("\n");
}
if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
syslog(LOG_ERR,
"first and last dump headers disagree on %s", device);
nerr++;
status = STATUS_BAD;
if (force == 0)
goto closefd;
} else {
status = STATUS_GOOD;
}
if (checkfor) {
printf("A dump exists on %s\n", device);
close(fd);
exit(0);
}
if (kdhl.panicstring[0])
syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
else
syslog(LOG_ALERT, "reboot");
if (verbose)
printf("Checking for available free space\n");
if (!check_space(savedir, dumpsize)) {
nerr++;
goto closefd;
}
writebounds(bounds + 1);
/*
* Write kernel file.
*/
fdkernin = open(getbootfile(), O_RDONLY, 0);
if (fdkernin < 0) {
syslog(LOG_ERR, "%s: %m", getbootfile());
}
if (compress) {
sprintf(buf, "kern.%d.gz", bounds);
fpkern = zopen(buf, "w");
} else {
sprintf(buf, "kern.%d", bounds);
fpkern = fopen(buf, "w");
}
if (fpkern == NULL) {
syslog(LOG_ERR, "%s: %m", buf);
close(fdkernin);
}
syslog(LOG_NOTICE, "writing %skernel to %s",
compress ? "compressed " : "", buf);
while ((nr = read(fdkernin, buf, sizeof(buf))) > 0) {
nw = fwrite(buf, 1, nr, fpkern);
if (nw != nr) {
syslog(LOG_ERR, "kern.%d: %m", bounds);
syslog(LOG_WARNING,
"WARNING: kernel may be incomplete");
exit(1);
}
}
if (nr < 0) {
syslog(LOG_ERR, "%s: %m", getbootfile());
syslog(LOG_WARNING,
"WARNING: kernel may be incomplete");
exit(1);
}
fclose(fpkern);
close(fdkernin);
sprintf(buf, "info.%d", bounds);
/*
* Create or overwrite any existing dump header files.
*/
fdinfo = open(buf, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fdinfo < 0) {
syslog(LOG_ERR, "%s: %m", buf);
nerr++;
goto closefd;
}
oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
if (compress) {
sprintf(buf, "vmcore.%d.gz", bounds);
fp = zopen(buf, "w");
} else {
sprintf(buf, "vmcore.%d", bounds);
fp = fopen(buf, "w");
}
if (fp == NULL) {
syslog(LOG_ERR, "%s: %m", buf);
close(fdinfo);
nerr++;
goto closefd;
}
(void)umask(oumask);
info = fdopen(fdinfo, "w");
if (info == NULL) {
syslog(LOG_ERR, "fdopen failed: %m");
nerr++;
goto closefd;
}
if (verbose)
printheader(stdout, &kdhl, device, bounds, status);
printheader(info, &kdhl, device, bounds, status);
fclose(info);
syslog(LOG_NOTICE, "writing %score to %s",
compress ? "compressed " : "", buf);
while (dumpsize > 0) {
wl = BUFFERSIZE;
if (wl > dumpsize)
wl = dumpsize;
nr = read(fd, buf, wl);
if (nr != wl) {
if (nr == 0)
syslog(LOG_WARNING,
"WARNING: EOF on dump device");
else
syslog(LOG_ERR, "read error on %s: %m", device);
nerr++;
goto closeall;
}
if (compress) {
nw = fwrite(buf, 1, wl, fp);
} else {
for (nw = 0; nw < nr; nw = he) {
/* find a contiguous block of zeroes */
for (hs = nw; hs < nr; hs += BLOCKSIZE) {
for (he = hs; he < nr && buf[he] == 0;
++he)
/* nothing */ ;
/* is the hole long enough to matter? */
if (he >= hs + BLOCKSIZE)
break;
}
/* back down to a block boundary */
he &= BLOCKMASK;
/*
* 1) Don't go beyond the end of the buffer.
* 2) If the end of the buffer is less than
* BLOCKSIZE bytes away, we're at the end
* of the file, so just grab what's left.
*/
if (hs + BLOCKSIZE > nr)
hs = he = nr;
/*
* At this point, we have a partial ordering:
* nw <= hs <= he <= nr
* If hs > nw, buf[nw..hs] contains non-zero data.
* If he > hs, buf[hs..he] is all zeroes.
*/
if (hs > nw)
if (fwrite(buf + nw, hs - nw, 1, fp)
!= 1)
break;
if (he > hs)
if (fseeko(fp, he - hs, SEEK_CUR) == -1)
break;
}
}
if (nw != wl) {
syslog(LOG_ERR,
"write error on vmcore.%d file: %m", bounds);
syslog(LOG_WARNING,
"WARNING: vmcore may be incomplete");
nerr++;
goto closeall;
}
if (verbose) {
dmpcnt += wl;
printf("%llu\r", (unsigned long long)dmpcnt);
fflush(stdout);
}
dumpsize -= wl;
}
if (verbose)
printf("\n");
if (fclose(fp) < 0) {
syslog(LOG_ERR, "error on vmcore.%d: %m", bounds);
nerr++;
goto closeall;
}
nsaved++;
if (verbose)
printf("dump saved\n");
nuke:
if (clear || !keep) {
if (verbose)
printf("clearing dump header\n");
memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
lseek(fd, lasthd, SEEK_SET);
error = write(fd, &kdhl, sizeof kdhl);
if (error != sizeof kdhl)
syslog(LOG_ERR,
"error while clearing the dump header: %m");
}
close(fd);
return;
closeall:
fclose(fp);
closefd:
close(fd);
}
static void
DoFile(const char *savedir, const char *device)
{
xo_handle_t *xostdout, *xoinfo;
static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
static char *buf = NULL, *temp = NULL;
struct kerneldumpheader kdhf, kdhl;
off_t mediasize, dumpsize, firsthd, lasthd;
FILE *info, *fp;
mode_t oumask;
int fd, fdinfo, error;
int bounds, status;
u_int sectorsize, xostyle;
int istextdump;
bounds = getbounds();
mediasize = 0;
status = STATUS_UNKNOWN;
xostdout = xo_create_to_file(stdout, XO_STYLE_TEXT, 0);
if (xostdout == NULL) {
syslog(LOG_ERR, "%s: %m", infoname);
return;
}
if (maxdumps > 0 && bounds == maxdumps)
bounds = 0;
if (buf == NULL) {
buf = malloc(BUFFERSIZE);
if (buf == NULL) {
syslog(LOG_ERR, "%m");
return;
}
}
if (verbose)
printf("checking for kernel dump on device %s\n", device);
fd = open(device, (checkfor || keep) ? O_RDONLY : O_RDWR);
if (fd < 0) {
syslog(LOG_ERR, "%s: %m", device);
return;
}
error = ioctl(fd, DIOCGMEDIASIZE, &mediasize);
if (!error)
error = ioctl(fd, DIOCGSECTORSIZE, §orsize);
if (error) {
syslog(LOG_ERR,
"couldn't find media and/or sector size of %s: %m", device);
goto closefd;
}
if (verbose) {
printf("mediasize = %lld\n", (long long)mediasize);
printf("sectorsize = %u\n", sectorsize);
}
if (sectorsize < sizeof(kdhl)) {
syslog(LOG_ERR,
"Sector size is less the kernel dump header %zu",
sizeof(kdhl));
goto closefd;
}
lasthd = mediasize - sectorsize;
if (temp == NULL) {
temp = malloc(sectorsize);
if (temp == NULL) {
syslog(LOG_ERR, "%m");
return;
}
}
if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
syslog(LOG_ERR,
"error reading last dump header at offset %lld in %s: %m",
(long long)lasthd, device);
goto closefd;
}
memcpy(&kdhl, temp, sizeof(kdhl));
istextdump = 0;
if (strncmp(kdhl.magic, TEXTDUMPMAGIC, sizeof kdhl) == 0) {
if (verbose)
printf("textdump magic on last dump header on %s\n",
device);
istextdump = 1;
if (dtoh32(kdhl.version) != KERNELDUMP_TEXT_VERSION) {
syslog(LOG_ERR,
"unknown version (%d) in last dump header on %s",
dtoh32(kdhl.version), device);
status = STATUS_BAD;
if (force == 0)
goto closefd;
}
} else if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic) ==
0) {
if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
syslog(LOG_ERR,
"unknown version (%d) in last dump header on %s",
dtoh32(kdhl.version), device);
status = STATUS_BAD;
if (force == 0)
goto closefd;
}
} else {
if (verbose)
printf("magic mismatch on last dump header on %s\n",
device);
status = STATUS_BAD;
if (force == 0)
goto closefd;
if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
sizeof kdhl.magic) == 0) {
if (verbose)
printf("forcing magic on %s\n", device);
memcpy(kdhl.magic, KERNELDUMPMAGIC,
sizeof kdhl.magic);
} else {
syslog(LOG_ERR, "unable to force dump - bad magic");
goto closefd;
}
if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
syslog(LOG_ERR,
"unknown version (%d) in last dump header on %s",
dtoh32(kdhl.version), device);
status = STATUS_BAD;
if (force == 0)
goto closefd;
}
}
nfound++;
if (clear)
goto nuke;
if (kerneldump_parity(&kdhl)) {
syslog(LOG_ERR,
"parity error on last dump header on %s", device);
nerr++;
status = STATUS_BAD;
if (force == 0)
goto closefd;
}
dumpsize = dtoh64(kdhl.dumplength);
firsthd = lasthd - dumpsize - sectorsize;
if (lseek(fd, firsthd, SEEK_SET) != firsthd ||
read(fd, temp, sectorsize) != (ssize_t)sectorsize) {
syslog(LOG_ERR,
"error reading first dump header at offset %lld in %s: %m",
(long long)firsthd, device);
nerr++;
goto closefd;
}
memcpy(&kdhf, temp, sizeof(kdhf));
if (verbose >= 2) {
printf("First dump headers:\n");
printheader(xostdout, &kdhf, device, bounds, -1);
printf("\nLast dump headers:\n");
printheader(xostdout, &kdhl, device, bounds, -1);
printf("\n");
}
if (memcmp(&kdhl, &kdhf, sizeof(kdhl))) {
syslog(LOG_ERR,
"first and last dump headers disagree on %s", device);
nerr++;
status = STATUS_BAD;
if (force == 0)
goto closefd;
} else {
status = STATUS_GOOD;
}
if (checkfor) {
printf("A dump exists on %s\n", device);
close(fd);
exit(0);
}
if (kdhl.panicstring[0] != '\0')
syslog(LOG_ALERT, "reboot after panic: %*s",
(int)sizeof(kdhl.panicstring), kdhl.panicstring);
else
syslog(LOG_ALERT, "reboot");
if (verbose)
printf("Checking for available free space\n");
if (!check_space(savedir, dumpsize, bounds)) {
nerr++;
goto closefd;
}
writebounds(bounds + 1);
saved_dump_remove(bounds);
snprintf(infoname, sizeof(infoname), "info.%d", bounds);
/*
* Create or overwrite any existing dump header files.
*/
fdinfo = open(infoname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fdinfo < 0) {
syslog(LOG_ERR, "%s: %m", infoname);
nerr++;
goto closefd;
}
oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
if (compress) {
snprintf(corename, sizeof(corename), "%s.%d.gz",
istextdump ? "textdump.tar" : "vmcore", bounds);
fp = zopen(corename, "w");
} else {
snprintf(corename, sizeof(corename), "%s.%d",
istextdump ? "textdump.tar" : "vmcore", bounds);
fp = fopen(corename, "w");
}
if (fp == NULL) {
syslog(LOG_ERR, "%s: %m", corename);
close(fdinfo);
nerr++;
goto closefd;
}
(void)umask(oumask);
info = fdopen(fdinfo, "w");
if (info == NULL) {
syslog(LOG_ERR, "fdopen failed: %m");
nerr++;
goto closeall;
}
xostyle = xo_get_style(NULL);
xoinfo = xo_create_to_file(info, xostyle, 0);
if (xoinfo == NULL) {
syslog(LOG_ERR, "%s: %m", infoname);
nerr++;
goto closeall;
}
xo_open_container_h(xoinfo, "crashdump");
if (verbose)
printheader(xostdout, &kdhl, device, bounds, status);
printheader(xoinfo, &kdhl, device, bounds, status);
xo_close_container_h(xoinfo, "crashdump");
xo_flush_h(xoinfo);
xo_finish_h(xoinfo);
fclose(info);
syslog(LOG_NOTICE, "writing %score to %s/%s",
compress ? "compressed " : "", savedir, corename);
if (istextdump) {
if (DoTextdumpFile(fd, dumpsize, lasthd, buf, device,
corename, fp) < 0)
goto closeall;
} else {
if (DoRegularFile(fd, dumpsize, buf, device, corename, fp)
< 0)
goto closeall;
}
if (verbose)
printf("\n");
if (fclose(fp) < 0) {
syslog(LOG_ERR, "error on %s: %m", corename);
nerr++;
goto closefd;
}
symlinks_remove();
if (symlink(infoname, "info.last") == -1) {
syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
savedir, "info.last");
}
if (compress) {
snprintf(linkname, sizeof(linkname), "%s.last.gz",
istextdump ? "textdump.tar" : "vmcore");
} else {
snprintf(linkname, sizeof(linkname), "%s.last",
istextdump ? "textdump.tar" : "vmcore");
}
if (symlink(corename, linkname) == -1) {
syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
savedir, linkname);
}
nsaved++;
if (verbose)
printf("dump saved\n");
nuke:
if (!keep) {
if (verbose)
printf("clearing dump header\n");
memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof(kdhl.magic));
memcpy(temp, &kdhl, sizeof(kdhl));
if (lseek(fd, lasthd, SEEK_SET) != lasthd ||
write(fd, temp, sectorsize) != (ssize_t)sectorsize)
syslog(LOG_ERR,
"error while clearing the dump header: %m");
}
xo_close_container_h(xostdout, "crashdump");
xo_finish_h(xostdout);
close(fd);
return;
closeall:
fclose(fp);
closefd:
close(fd);
}
