/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2002 Poul-Henning Kamp * Copyright (c) 2002 Networks Associates Technology, Inc. * All rights reserved. * * This software was developed for the FreeBSD Project by Poul-Henning Kamp * and NAI Labs, the Security Research Division of Network Associates, Inc. * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the * DARPA CHATS research program. * * 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. The names of the authors may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* The size of the buffer used for I/O. */ #define BUFFERSIZE (1024*1024) #define STATUS_BAD 0 #define STATUS_GOOD 1 #define STATUS_UNKNOWN 2 static int checkfor, compress, clear, force, keep, verbose; /* flags */ static int nfound, nsaved, nerr; /* statistics */ static int maxdumps; extern FILE *zopen(const char *, const char *); static sig_atomic_t got_siginfo; static void infohandler(int); 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; const char *comp_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)); switch (h->compression) { case KERNELDUMP_COMP_NONE: comp_str = "none"; break; case KERNELDUMP_COMP_GZIP: comp_str = "gzip"; break; case KERNELDUMP_COMP_ZSTD: comp_str = "zstd"; break; default: comp_str = "???"; break; } xo_emit_h(xo, "{P: }{Lwc:Compression}{:compression/%s}\n", comp_str); 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"; break; } xo_emit_h(xo, "{P: }{Lwc:Dump Status}{:dump_status/%s}\n", stat_str); xo_flush_h(xo); } static int getbounds(void) { FILE *fp; char buf[6]; int ret; /* * If we are just checking, then we haven't done a chdir to the dump * directory and we should not try to read a bounds file. */ if (checkfor) return (0); ret = 0; if ((fp = fopen("bounds", "r")) == NULL) { if (verbose) printf("unable to open bounds file, using 0\n"); return (ret); } if (fgets(buf, sizeof buf, fp) == NULL) { if (feof(fp)) syslog(LOG_WARNING, "bounds file is empty, using 0"); else syslog(LOG_WARNING, "bounds file: %s", strerror(errno)); fclose(fp); return (ret); } errno = 0; ret = (int)strtol(buf, NULL, 10); if (ret == 0 && (errno == EINVAL || errno == ERANGE)) syslog(LOG_WARNING, "invalid value found in bounds, using 0"); fclose(fp); return (ret); } static void writebounds(int bounds) { FILE *fp; if ((fp = fopen("bounds", "w")) == NULL) { syslog(LOG_WARNING, "unable to write to bounds file: %m"); return; } if (verbose) printf("bounds number: %d\n", bounds); fprintf(fp, "%d\n", bounds); fclose(fp); } static bool writekey(const char *keyname, uint8_t *dumpkey, uint32_t dumpkeysize) { int fd; fd = open(keyname, O_WRONLY | O_CREAT | O_TRUNC, 0600); if (fd == -1) { syslog(LOG_ERR, "Unable to open %s to write the key: %m.", keyname); return (false); } if (write(fd, dumpkey, dumpkeysize) != (ssize_t)dumpkeysize) { syslog(LOG_ERR, "Unable to write the key to %s: %m.", keyname); close(fd); return (false); } close(fd); return (true); } static off_t file_size(const char *path) { struct stat sb; /* Ignore all errors, those file may not exists. */ if (stat(path, &sb) == -1) return (0); return (sb.st_size); } static off_t saved_dump_size(int bounds) { static char path[PATH_MAX]; off_t dumpsize; dumpsize = 0; (void)snprintf(path, sizeof(path), "info.%d", bounds); dumpsize += file_size(path); (void)snprintf(path, sizeof(path), "vmcore.%d", bounds); dumpsize += file_size(path); (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds); dumpsize += file_size(path); (void)snprintf(path, sizeof(path), "vmcore.%d.zst", bounds); dumpsize += file_size(path); (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds); dumpsize += file_size(path); (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds); dumpsize += file_size(path); return (dumpsize); } static void saved_dump_remove(int bounds) { static char path[PATH_MAX]; (void)snprintf(path, sizeof(path), "info.%d", bounds); (void)unlink(path); (void)snprintf(path, sizeof(path), "vmcore.%d", bounds); (void)unlink(path); (void)snprintf(path, sizeof(path), "vmcore.%d.gz", bounds); (void)unlink(path); (void)snprintf(path, sizeof(path), "vmcore.%d.zst", bounds); (void)unlink(path); (void)snprintf(path, sizeof(path), "textdump.tar.%d", bounds); (void)unlink(path); (void)snprintf(path, sizeof(path), "textdump.tar.%d.gz", bounds); (void)unlink(path); } static void symlinks_remove(void) { (void)unlink("info.last"); (void)unlink("key.last"); (void)unlink("vmcore.last"); (void)unlink("vmcore.last.gz"); (void)unlink("vmcore.last.zstd"); (void)unlink("vmcore_encrypted.last"); (void)unlink("vmcore_encrypted.last.gz"); (void)unlink("textdump.tar.last"); (void)unlink("textdump.tar.last.gz"); } /* * Check that sufficient space is available on the disk that holds the * save directory. */ static int check_space(const char *savedir, off_t dumpsize, int bounds) { FILE *fp; off_t available, minfree, spacefree, totfree, needed; struct statfs fsbuf; char buf[100]; if (statfs(".", &fsbuf) < 0) { syslog(LOG_ERR, "%s: %m", savedir); exit(1); } spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024; totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024; if ((fp = fopen("minfree", "r")) == NULL) minfree = 0; else { if (fgets(buf, sizeof(buf), fp) == NULL) minfree = 0; else { char *endp; errno = 0; minfree = strtoll(buf, &endp, 10); if (minfree == 0 && errno != 0) minfree = -1; else { while (*endp != '\0' && isspace(*endp)) endp++; if (*endp != '\0' || minfree < 0) minfree = -1; } if (minfree < 0) syslog(LOG_WARNING, "`minfree` didn't contain a valid size " "(`%s`). Defaulting to 0", buf); } (void)fclose(fp); } available = minfree > 0 ? spacefree - minfree : totfree; needed = dumpsize / 1024 + 2; /* 2 for info file */ needed -= saved_dump_size(bounds); if (available < needed) { syslog(LOG_WARNING, "no dump: not enough free space on device (need at least " "%jdkB for dump; %jdkB available; %jdkB reserved)", (intmax_t)needed, (intmax_t)available + minfree, (intmax_t)minfree); return (0); } if (spacefree - needed < 0) syslog(LOG_WARNING, "dump performed, but free space threshold crossed"); return (1); } static bool compare_magic(const struct kerneldumpheader *kdh, const char *magic) { return (strncmp(kdh->magic, magic, sizeof(kdh->magic)) == 0); } #define BLOCKSIZE (1<<12) #define BLOCKMASK (~(BLOCKSIZE-1)) static int DoRegularFile(int fd, off_t dumpsize, u_int sectorsize, bool sparse, char *buf, const char *device, const char *filename, FILE *fp) { int he, hs, nr, nw, wl; off_t dmpcnt, origsize; dmpcnt = 0; origsize = dumpsize; he = 0; while (dumpsize > 0) { wl = BUFFERSIZE; if (wl > dumpsize) wl = dumpsize; nr = read(fd, buf, roundup(wl, sectorsize)); if (nr != (int)roundup(wl, sectorsize)) { if (nr == 0) syslog(LOG_WARNING, "WARNING: EOF on dump device"); else syslog(LOG_ERR, "read error on %s: %m", device); nerr++; return (-1); } if (!sparse) { 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 %s file: %m", filename); syslog(LOG_WARNING, "WARNING: vmcore may be incomplete"); nerr++; return (-1); } if (verbose) { dmpcnt += wl; printf("%llu\r", (unsigned long long)dmpcnt); fflush(stdout); } dumpsize -= wl; if (got_siginfo) { printf("%s %.1lf%%\n", filename, (100.0 - (100.0 * (double)dumpsize / (double)origsize))); got_siginfo = 0; } } return (0); } /* * Specialized version of dump-reading logic for use with textdumps, which * are written backwards from the end of the partition, and must be reversed * before being written to the file. Textdumps are small, so do a bit less * work to optimize/sparsify. */ static int DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf, const char *device, const char *filename, FILE *fp) { int nr, nw, wl; off_t dmpcnt, totsize; totsize = dumpsize; dmpcnt = 0; wl = 512; if ((dumpsize % wl) != 0) { syslog(LOG_ERR, "textdump uneven multiple of 512 on %s", device); nerr++; return (-1); } while (dumpsize > 0) { nr = pread(fd, buf, wl, lasthd - (totsize - dumpsize) - 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++; return (-1); } nw = fwrite(buf, 1, wl, fp); if (nw != wl) { syslog(LOG_ERR, "write error on %s file: %m", filename); syslog(LOG_WARNING, "WARNING: textdump may be incomplete"); nerr++; return (-1); } if (verbose) { dmpcnt += wl; printf("%llu\r", (unsigned long long)dmpcnt); fflush(stdout); } dumpsize -= wl; } return (0); } 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 keyname[PATH_MAX]; static char *buf = NULL; char *temp = NULL; struct kerneldumpheader kdhf, kdhl; uint8_t *dumpkey; off_t mediasize, dumpextent, dumplength, firsthd, lasthd; FILE *info, *fp; mode_t oumask; int fd, fdinfo, error; int bounds, status; u_int sectorsize, xostyle; uint32_t dumpkeysize; bool iscompressed, isencrypted, istextdump, ret; bounds = getbounds(); dumpkey = NULL; 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 bytes\n", (long long)mediasize); printf("sectorsize = %u bytes\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; temp = malloc(sectorsize); if (temp == NULL) { syslog(LOG_ERR, "%m"); goto closefd; } 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)); iscompressed = istextdump = false; if (compare_magic(&kdhl, TEXTDUMPMAGIC)) { if (verbose) printf("textdump magic on last dump header on %s\n", device); istextdump = true; 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 (compare_magic(&kdhl, KERNELDUMPMAGIC)) { 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; } switch (kdhl.compression) { case KERNELDUMP_COMP_NONE: break; case KERNELDUMP_COMP_GZIP: case KERNELDUMP_COMP_ZSTD: if (compress && verbose) printf("dump is already compressed\n"); compress = false; iscompressed = true; break; default: syslog(LOG_ERR, "unknown compression type %d on %s", kdhl.compression, device); break; } } else { if (verbose) printf("magic mismatch on last dump header on %s\n", device); status = STATUS_BAD; if (force == 0) goto closefd; if (compare_magic(&kdhl, KERNELDUMPMAGIC_CLEARED)) { 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; } dumpextent = dtoh64(kdhl.dumpextent); dumplength = dtoh64(kdhl.dumplength); dumpkeysize = dtoh32(kdhl.dumpkeysize); firsthd = lasthd - dumpextent - sectorsize - dumpkeysize; 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, dumplength, 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. */ isencrypted = (dumpkeysize > 0); if (compress) { snprintf(corename, sizeof(corename), "%s.%d.gz", istextdump ? "textdump.tar" : (isencrypted ? "vmcore_encrypted" : "vmcore"), bounds); fp = zopen(corename, "w"); } else if (iscompressed && !isencrypted) { snprintf(corename, sizeof(corename), "vmcore.%d.%s", bounds, (kdhl.compression == KERNELDUMP_COMP_GZIP) ? "gz" : "zst"); fp = fopen(corename, "w"); } else { snprintf(corename, sizeof(corename), "%s.%d", istextdump ? "textdump.tar" : (isencrypted ? "vmcore_encrypted" : "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); if (isencrypted) { dumpkey = calloc(1, dumpkeysize); if (dumpkey == NULL) { syslog(LOG_ERR, "Unable to allocate kernel dump key."); nerr++; goto closeall; } if (read(fd, dumpkey, dumpkeysize) != (ssize_t)dumpkeysize) { syslog(LOG_ERR, "Unable to read kernel dump key: %m."); nerr++; goto closeall; } snprintf(keyname, sizeof(keyname), "key.%d", bounds); ret = writekey(keyname, dumpkey, dumpkeysize); explicit_bzero(dumpkey, dumpkeysize); if (!ret) { nerr++; goto closeall; } } syslog(LOG_NOTICE, "writing %s%score to %s/%s", isencrypted ? "encrypted " : "", compress ? "compressed " : "", savedir, corename); if (istextdump) { if (DoTextdumpFile(fd, dumplength, lasthd, buf, device, corename, fp) < 0) goto closeall; } else { if (DoRegularFile(fd, dumplength, sectorsize, !(compress || iscompressed || isencrypted), 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 (isencrypted) { if (symlink(keyname, "key.last") == -1) { syslog(LOG_WARNING, "unable to create symlink %s/%s: %m", savedir, "key.last"); } } if (compress || iscompressed) { snprintf(linkname, sizeof(linkname), "%s.last.%s", istextdump ? "textdump.tar" : (isencrypted ? "vmcore_encrypted" : "vmcore"), (kdhl.compression == KERNELDUMP_COMP_ZSTD) ? "zst" : "gz"); } else { snprintf(linkname, sizeof(linkname), "%s.last", istextdump ? "textdump.tar" : (isencrypted ? "vmcore_encrypted" : "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); free(dumpkey); free(temp); close(fd); return; closeall: fclose(fp); closefd: free(dumpkey); free(temp); close(fd); } static void usage(void) { xo_error("%s\n%s\n%s\n", "usage: savecore -c [-v] [device ...]", " savecore -C [-v] [device ...]", " savecore [-fkvz] [-m maxdumps] [directory [device ...]]"); exit(1); } int main(int argc, char **argv) { const char *savedir = "."; struct fstab *fsp; int i, ch, error; checkfor = compress = clear = force = keep = verbose = 0; nfound = nsaved = nerr = 0; openlog("savecore", LOG_PERROR, LOG_DAEMON); signal(SIGINFO, infohandler); argc = xo_parse_args(argc, argv); if (argc < 0) exit(1); while ((ch = getopt(argc, argv, "Ccfkm:vz")) != -1) switch(ch) { case 'C': checkfor = 1; break; case 'c': clear = 1; break; case 'f': force = 1; break; case 'k': keep = 1; break; case 'm': maxdumps = atoi(optarg); if (maxdumps <= 0) { syslog(LOG_ERR, "Invalid maxdump value"); exit(1); } break; case 'v': verbose++; break; case 'z': compress = 1; break; case '?': default: usage(); } if (checkfor && (clear || force || keep)) usage(); if (clear && (compress || keep)) usage(); if (maxdumps > 0 && (checkfor || clear)) usage(); argc -= optind; argv += optind; if (argc >= 1 && !checkfor && !clear) { 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); } endfsent(); } else { for (i = 0; i < argc; i++) DoFile(savedir, argv[i]); } /* Emit minimal output. */ if (nfound == 0) { if (checkfor) { if (verbose) printf("No dump exists\n"); exit(1); } if (verbose) syslog(LOG_WARNING, "no dumps found"); } else if (nsaved == 0) { if (nerr != 0) { if (verbose) syslog(LOG_WARNING, "unsaved dumps found but not saved"); exit(1); } else if (verbose) syslog(LOG_WARNING, "no unsaved dumps found"); } return (0); } static void infohandler(int sig __unused) { got_siginfo = 1; }